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Dr. M V Venkatashamy Reddy
Centre of Excellence in Transportation Electrification and Energy Storage (CETEES), Institute of Research Hydro-Québec

Basic Info


Research Keywords & Expertise

0 Electrochemistry
0 Lithium Batteries
0 Materials Chemistry
0 materials characterization
0 Energy Storage And Conversion Devices

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Lithium Batteries
Electrochemistry

Honors and Awards

Outstanding Science Mentorship Award (2010 to 2018),

Ministry of Education, Singapore


Inspiring Research Mentor Award (2011 to 2018) from NUS High School of Mathematics and Science.

NUSHS




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Short Biography

Dr. M.V. Reddy obtained his PhD (2003) with the highest honors in materials Science from the University of Bordeaux 1, France. From 2003 to May 2019, he worked at the National University of Singapore at the Department of Physics, Materials Science and Engineering, and Chemistry as a senior research fellow. From June 2019, he is working as a senior researcher at CETEES, Hydro Quebec, Canada. For the last 20 years, he has been working on materials for energy storage: cathodes, anodes, and solid electrolytes for Li/Na/K- ion batteries and supercapacitors. He published over 200 papers, and his work is cited over 15100 times, with an h index of 64 and top 2% highly cited researcher in energy. He has won many awards and given 100 talks all over the world.

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Journal article
Published: 27 July 2021 in Electrochem
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Metal–organic frameworks (MOFs) have found a potential application in various domains such as gas storage/separation, drug delivery, catalysis, etc. Recently, they have found considerable attention for energy storage applications such as Li- and Na-ion batteries. However, the development of MOFs is plagued by their limited energy density that arises from high molecular weight and low volumetric density. The choice of ligand plays a crucial role in determining the performance of the MOFs. Here, we report a nickel-based one-dimensional metal-organic framework, NiC4H2O4, built from bidentate fumarate ligands for anode application in Li-ion batteries. The material was obtained by a simple chimie douce precipitation method using nickel acetate and fumaric acid. Moreover, a composite material of the MOF with reduced graphene oxide (rGO) was prepared to enhance the lithium storage performance as the rGO can enhance the electronic conductivity. Electrochemical lithium storage in the framework and the effect of rGO on the performance have been investigated by cyclic voltammetry, galvanostatic charge–discharge measurements, and EIS studies. The pristine nickel formate encounters serious capacity fading while the rGO composite offers good cycling stability with high reversible capacities of over 800 mAh g1.

ACS Style

Shahul Hameed; Shaikshavali Petnikota; Nusyba Hassan; Siham Al-Qaradawi; Zaghib Karim; M. Reddy. Synthesis of Nickel Fumarate and Its Electrochemical Properties for Li-Ion Batteries. Electrochem 2021, 2, 439 -451.

AMA Style

Shahul Hameed, Shaikshavali Petnikota, Nusyba Hassan, Siham Al-Qaradawi, Zaghib Karim, M. Reddy. Synthesis of Nickel Fumarate and Its Electrochemical Properties for Li-Ion Batteries. Electrochem. 2021; 2 (3):439-451.

Chicago/Turabian Style

Shahul Hameed; Shaikshavali Petnikota; Nusyba Hassan; Siham Al-Qaradawi; Zaghib Karim; M. Reddy. 2021. "Synthesis of Nickel Fumarate and Its Electrochemical Properties for Li-Ion Batteries." Electrochem 2, no. 3: 439-451.

Journal article
Published: 02 June 2021 in Electrochem
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In this work, we report a sol-gel synthesis-based Zn-doped Na0.6Fe0.5Mn0.5O2 (NFM) cathode and understand the effect of Zn doping on the crystal structure and electrochemical performances such as discharge capacity and rate capability. Detailed X-Ray diffraction (XRD) pattern analysis indicated a decrease in the Na-layer thickness with Zn doping. Small amount of Zn2+ dopant (i.e., 2 at.%) slightly improved cycling stability, reversibility, and rate performances at higher discharge current rates. For example, at 1 C-rate (1 C = 260 mAh/g), the Zn2+-doped cathode retained a stable reversible capacity of 72 mAh/g, which was ~16% greater than that of NFM (62 mAh/g) and showed a minor improvement in the capacity retention of 60% compared to 55% for the pristine NFM after 65 cycles. Slight improvement in the electrochemical performance for the Zn-doped cathode can be attributed to a better structural stability, which prevented the initial phase transition and showed the presence of electrochemical active Fe3+/4+ even after 10 cycles compared to NFM.

ACS Style

Devendrasinh Darbar; M. Reddy; Indranil Bhattacharya. Understanding the Effect of Zn Doping on Stability of Cobalt-Free P2-Na0.60Fe0.5Mn0.5O2 Cathode for Sodium Ion Batteries. Electrochem 2021, 2, 323 -334.

AMA Style

Devendrasinh Darbar, M. Reddy, Indranil Bhattacharya. Understanding the Effect of Zn Doping on Stability of Cobalt-Free P2-Na0.60Fe0.5Mn0.5O2 Cathode for Sodium Ion Batteries. Electrochem. 2021; 2 (2):323-334.

Chicago/Turabian Style

Devendrasinh Darbar; M. Reddy; Indranil Bhattacharya. 2021. "Understanding the Effect of Zn Doping on Stability of Cobalt-Free P2-Na0.60Fe0.5Mn0.5O2 Cathode for Sodium Ion Batteries." Electrochem 2, no. 2: 323-334.

Journal article
Published: 05 May 2021 in Energies
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In recent years, the need to reduce environmental impacts and increase flexibility in the energy sector has led to increased penetration of renewable energy sources and the shift from concentrated to decentralized generation. A fuel cell is an instrument that produces electricity by chemical reaction. Fuel cells are a promising technology for ultimate energy conversion and energy generation. We see that this system is integrated, where we find that the wind and photovoltaic energy system is complementary between them, because not all days are sunny, windy, or night, so we see that this system has higher reliability to provide continuous generation. At low load hours, PV and electrolysis units produce extra power. After being compressed, hydrogen is stored in tanks. The purpose of this study is to separate the Bahr AL-Najaf Area from the main power grid and make it an independent network by itself. The PEM fuel cells were analyzed and designed, and it were found that one layer is equal to 570.96 Watt at 0.61 volts and 1.04 A/Cm2. The number of layers in one stack is designed to be equal to 13 layers, so that the total power of one stack is equal to 7422.48 Watt. That is, the number of stacks required to generate the required energy from the fuel cells is equal to 203 stk. This study provided an analysis of the hybrid system to cover the electricity demand in the Bahr AL-Najaf region of 1.5 MW, the attained hybrid power system TNPC cost was about 9,573,208 USD, whereas the capital cost and energy cost (COE) were about 7,750,000 USD and 0.169 USD/kWh respectively, for one year.

ACS Style

Hussein Al-Bonsrulah; Mohammed Alshukri; Lama Mikhaeel; Noor Al-Sawaf; Kefif Nesrine; M.V. Reddy; Karim Zaghib. Design and Simulation Studies of Hybrid Power Systems Based on Photovoltaic, Wind, Electrolyzer, and PEM Fuel Cells. Energies 2021, 14, 2643 .

AMA Style

Hussein Al-Bonsrulah, Mohammed Alshukri, Lama Mikhaeel, Noor Al-Sawaf, Kefif Nesrine, M.V. Reddy, Karim Zaghib. Design and Simulation Studies of Hybrid Power Systems Based on Photovoltaic, Wind, Electrolyzer, and PEM Fuel Cells. Energies. 2021; 14 (9):2643.

Chicago/Turabian Style

Hussein Al-Bonsrulah; Mohammed Alshukri; Lama Mikhaeel; Noor Al-Sawaf; Kefif Nesrine; M.V. Reddy; Karim Zaghib. 2021. "Design and Simulation Studies of Hybrid Power Systems Based on Photovoltaic, Wind, Electrolyzer, and PEM Fuel Cells." Energies 14, no. 9: 2643.

Review article
Published: 25 March 2021 in Materials Advances
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In this review, the development of MOFs and MOF-based materials for application in non-Li rechargeable batteries has been highlighted together with describing the various persisting challenges and their corresponding remedies for these materials.

ACS Style

Anukul K. Thakur; Mandira Majumder; Shashikant P. Patole; Karim Zaghib; M. V. Reddy. Metal–organic framework-based materials: advances, exploits, and challenges in promoting post Li-ion battery technologies. Materials Advances 2021, 2, 2457 -2482.

AMA Style

Anukul K. Thakur, Mandira Majumder, Shashikant P. Patole, Karim Zaghib, M. V. Reddy. Metal–organic framework-based materials: advances, exploits, and challenges in promoting post Li-ion battery technologies. Materials Advances. 2021; 2 (8):2457-2482.

Chicago/Turabian Style

Anukul K. Thakur; Mandira Majumder; Shashikant P. Patole; Karim Zaghib; M. V. Reddy. 2021. "Metal–organic framework-based materials: advances, exploits, and challenges in promoting post Li-ion battery technologies." Materials Advances 2, no. 8: 2457-2482.

Journal article
Published: 19 September 2020 in Journal of Power Sources
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Porous Na3V2(PO4)3/C composites were prepared in situ via a simple solution method using various amounts of cetyltrimethylammonium bromide and glycine mixtures. Platelet particles with a thickness of ~150 nm were formed when 0.4 mmol cetyltrimethylammonium bromide and 0.4 mmol glycine were used, resulting in a high specific surface area (16 m2 g−1) and porosity (0.05 cm3 g−1) of the composites. In addition, the porous Na3V2(PO4)3/C composites presented good reversible cyclic voltammetry peaks with low hysteresis and delivered a high specific discharge capacity of 113 mA h g−1, which decreased to 99 mA h g−1 (capacity retention of 88.1%) after 200 cycles at the current rate of 1 C. The high rate capability (96 mA h g−1 at 10 C) of the composites was attributed to their unique foamy microstructure, plate-like particles, and high electronic conductivity.

ACS Style

A.H. Salehi; S.M. Masoudpanah; M. Hasheminiasari; A. Yaghtin; D. Safanama; C.K. Ong; S. Adams; Karim Zaghib; M.V. Reddy. Facile synthesis of hierarchical porous Na3V2(PO4)3/C composites with high-performance Na storage properties. Journal of Power Sources 2020, 481, 228828 .

AMA Style

A.H. Salehi, S.M. Masoudpanah, M. Hasheminiasari, A. Yaghtin, D. Safanama, C.K. Ong, S. Adams, Karim Zaghib, M.V. Reddy. Facile synthesis of hierarchical porous Na3V2(PO4)3/C composites with high-performance Na storage properties. Journal of Power Sources. 2020; 481 ():228828.

Chicago/Turabian Style

A.H. Salehi; S.M. Masoudpanah; M. Hasheminiasari; A. Yaghtin; D. Safanama; C.K. Ong; S. Adams; Karim Zaghib; M.V. Reddy. 2020. "Facile synthesis of hierarchical porous Na3V2(PO4)3/C composites with high-performance Na storage properties." Journal of Power Sources 481, no. : 228828.

Journal article
Published: 28 August 2020 in Materials Chemistry and Physics
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In this article, we report simple and scalable one-pot molten salt synthesis of CoFe2O4 as electrode material for Lithium ion batteries. X-ray diffraction studies along with Rietveld analysis showed a pure phase of CoFe2O4 with space group Fd-3m and crystallite size of 54 nm. As an anode material CoFe2O4 showed high initial discharge/charge capacity of 1556/1093 mA h g−1 and a reversible capacity of 926 mA h g−1 after 30 cycles with columbic efficiency of 99%. A relatively high reversible capacity of 594 mA h g−1 was observed at high current density of 1C (916 mA g−1) which shows the better reversibility of CoFe2O4 at high current density. As the current was reduced to 0.1C reversible capacity of 899 mA h g−1 was retained suggesting high rate performance of CoFe2O4. The long-term stability test, carried out using galvanostatic charge/discharge (GC) at a current density of 0.5C, showed a reversible capacity of 369 mA h g−1 at the end of 200th cycle. The structural and morphological evaluation of the sample after cycling, using ex-situ X-ray diffraction and ex-situ transmission electron microscopy, confirmed structural degradation and formation of metal nanoparticles, Li2O and amorphous nature of electrode material. The one-pot molten salt synthesis approach is quite simple and can be extended for large-scale production of electrode materials.

ACS Style

Pranav Kulkarni; R. Geetha Balkrishna; Debasis Ghosh; R.S. Rawat; Rohit Medwal; B.V.R. Chowdari; Zaghib Karim; M.V. Reddy. Molten salt synthesis of CoFe2O4 and its energy storage properties. Materials Chemistry and Physics 2020, 257, 123747 .

AMA Style

Pranav Kulkarni, R. Geetha Balkrishna, Debasis Ghosh, R.S. Rawat, Rohit Medwal, B.V.R. Chowdari, Zaghib Karim, M.V. Reddy. Molten salt synthesis of CoFe2O4 and its energy storage properties. Materials Chemistry and Physics. 2020; 257 ():123747.

Chicago/Turabian Style

Pranav Kulkarni; R. Geetha Balkrishna; Debasis Ghosh; R.S. Rawat; Rohit Medwal; B.V.R. Chowdari; Zaghib Karim; M.V. Reddy. 2020. "Molten salt synthesis of CoFe2O4 and its energy storage properties." Materials Chemistry and Physics 257, no. : 123747.

Journal article
Published: 17 August 2020 in Molecules
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In this study, Li3V2(PO4)3 (LVP) powders are prepared by a solution synthesis method. The effects of two reducing agents on crystal structure and morphology and electrochemical properties are investigated. Preliminary studies on reducing agents such as oxalic acid and citric acid, are used to reduce the vanadium (V) precursor. The oxalic acid-assisted synthesis induces smaller particles (30 nm) compared with the citric acid-assisted synthesis (70 nm). The LVP powders obtained by the oxalic acid exhibit a higher specific capacity (124 mAh g−1 at 1C) and better cycling performance (122 mAh g−1 following 50 cycles at 1C rate) than those for the citric acid. This is due to their higher electronic conductivity caused by carbon coating and downsizing the particles. The charge-discharge plateaus obtained from cyclic voltammetry are in good agreement with galvanostatic cycling profiles.

ACS Style

Ali Yaghtin; Seyyed Masoudpanah; Masood Hasheminiasari; Amirhossein Salehi; Dorsasadat Safanama; Chong Ong; Stefan Adams; Mogalahalli Reddy. Effect of Reducing Agent on Solution Synthesis of Li3V2(PO4)3 Cathode Material for Lithium Ion Batteries. Molecules 2020, 25, 3746 .

AMA Style

Ali Yaghtin, Seyyed Masoudpanah, Masood Hasheminiasari, Amirhossein Salehi, Dorsasadat Safanama, Chong Ong, Stefan Adams, Mogalahalli Reddy. Effect of Reducing Agent on Solution Synthesis of Li3V2(PO4)3 Cathode Material for Lithium Ion Batteries. Molecules. 2020; 25 (16):3746.

Chicago/Turabian Style

Ali Yaghtin; Seyyed Masoudpanah; Masood Hasheminiasari; Amirhossein Salehi; Dorsasadat Safanama; Chong Ong; Stefan Adams; Mogalahalli Reddy. 2020. "Effect of Reducing Agent on Solution Synthesis of Li3V2(PO4)3 Cathode Material for Lithium Ion Batteries." Molecules 25, no. 16: 3746.

Review
Published: 15 August 2020 in Nanomaterials
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Energy storage materials are finding increasing applications in our daily lives, for devices such as mobile phones and electric vehicles. Current commercial batteries use flammable liquid electrolytes, which are unsafe, toxic, and environmentally unfriendly with low chemical stability. Recently, solid electrolytes have been extensively studied as alternative electrolytes to address these shortcomings. Herein, we report the early history, synthesis and characterization, mechanical properties, and Li+ ion transport mechanisms of inorganic sulfide and oxide electrolytes. Furthermore, we highlight the importance of the fabrication technology and experimental conditions, such as the effects of pressure and operating parameters, on the electrochemical performance of all-solid-state Li batteries. In particular, we emphasize promising electrolyte systems based on sulfides and argyrodites, such as LiPS5Cl and β-Li3PS4, oxide electrolytes, bare and doped Li7La3Zr2O12 garnet, NASICON-type structures, and perovskite electrolyte materials. Moreover, we discuss the present and future challenges that all-solid-state batteries face for large-scale industrial applications.

ACS Style

Mogalahalli V. Reddy; Christian M. Julien; Alain Mauger; Karim Zaghib. Sulfide and Oxide Inorganic Solid Electrolytes for All-Solid-State Li Batteries: A Review. Nanomaterials 2020, 10, 1606 .

AMA Style

Mogalahalli V. Reddy, Christian M. Julien, Alain Mauger, Karim Zaghib. Sulfide and Oxide Inorganic Solid Electrolytes for All-Solid-State Li Batteries: A Review. Nanomaterials. 2020; 10 (8):1606.

Chicago/Turabian Style

Mogalahalli V. Reddy; Christian M. Julien; Alain Mauger; Karim Zaghib. 2020. "Sulfide and Oxide Inorganic Solid Electrolytes for All-Solid-State Li Batteries: A Review." Nanomaterials 10, no. 8: 1606.

Review
Published: 17 April 2020 in Materials
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Lithium batteries are electrochemical devices that are widely used as power sources. This history of their development focuses on the original development of lithium-ion batteries. In particular, we highlight the contributions of Professor Michel Armand related to the electrodes and electrolytes for lithium-ion batteries.

ACS Style

Mogalahalli V. Reddy; Alain Mauger; Christian M. Julien; Andrea Paolella; Karim Zaghib. Brief History of Early Lithium-Battery Development. Materials 2020, 13, 1884 .

AMA Style

Mogalahalli V. Reddy, Alain Mauger, Christian M. Julien, Andrea Paolella, Karim Zaghib. Brief History of Early Lithium-Battery Development. Materials. 2020; 13 (8):1884.

Chicago/Turabian Style

Mogalahalli V. Reddy; Alain Mauger; Christian M. Julien; Andrea Paolella; Karim Zaghib. 2020. "Brief History of Early Lithium-Battery Development." Materials 13, no. 8: 1884.

Research article
Published: 18 March 2020 in Energy & Fuels
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High density charge (energy) storage under supercapacitive mode requires an electrode which would deliver larger space for charge accumulation and offer larger electrochemical potential difference at an electrode–electrolyte interface. Porous carbon has been a preferred electrode for commercial supercapacitors; however, the charge storability is much lower to the state-of-the-art charge storage devices such as lithium ion batteries. We show that one of the primary limiting factors is the voids in porous carbon, which do not contribute to the capacitance as their sizes are much larger than the size of the solvated/unsolvated ions in the electrolyte. We partially activate these voids by filling them with a flower-shaped 3D hierarchical pseudocapacitive material (MnCo2O4) by assuming that flower-shaped fillers would provide additional easily accessible surface for charge adsorption. Less than 10wt.% MnCo2O4 in the porous carbon from palm kernel shells through a simple wet impregnation results in five-fold increase in the charge storability. Laboratory prototypes of symmetric supercapacitors are fabricated using the MnCo2O4-filled-carbon electrodes, which show five-fold higher specific energy than that of pure carbon and are cycled over 5000 times with >95% capacitance retention. The present strategy of activating the voids by hierarchical 3D nanostructures could be applied to build high performance energy storage devices.

ACS Style

Bincy Lathakumary Vijayan; Nurul Khairiyyah Mohd Zain; Izan Izwan Misnon; Mogalahalli Venkatashamy Reddy; Stefan Adams; Chun-Chen Yang; Gopinathan M. Anilkumar; Rajan Jose. Void Space Control in Porous Carbon for High-Density Supercapacitive Charge Storage. Energy & Fuels 2020, 34, 5072 -5083.

AMA Style

Bincy Lathakumary Vijayan, Nurul Khairiyyah Mohd Zain, Izan Izwan Misnon, Mogalahalli Venkatashamy Reddy, Stefan Adams, Chun-Chen Yang, Gopinathan M. Anilkumar, Rajan Jose. Void Space Control in Porous Carbon for High-Density Supercapacitive Charge Storage. Energy & Fuels. 2020; 34 (4):5072-5083.

Chicago/Turabian Style

Bincy Lathakumary Vijayan; Nurul Khairiyyah Mohd Zain; Izan Izwan Misnon; Mogalahalli Venkatashamy Reddy; Stefan Adams; Chun-Chen Yang; Gopinathan M. Anilkumar; Rajan Jose. 2020. "Void Space Control in Porous Carbon for High-Density Supercapacitive Charge Storage." Energy & Fuels 34, no. 4: 5072-5083.

Paper
Published: 06 May 2019 in New Journal of Chemistry
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Composites such as MgO/few-layered graphene can be used as electrode materials in supercapacitors with aqueous electrolytes but not non-aqueous electrolytes.

ACS Style

Shaikshavali Petnikota; Vadali V. S. S. Srikanth; Jun Jie Toh; Madhavi Srinivasan; Chowdari V. R. Bobba; Stefan Adams; Mogalahalli V. Reddy; Srikanth Venkata Satya Siva Vadali; Chowdari B.V.R. Electrochemistry-related aspects of safety of graphene-based non-aqueous electrochemical supercapacitors: a case study with MgO-decorated few-layer graphene as an electrode material. New Journal of Chemistry 2019, 43, 9793 -9801.

AMA Style

Shaikshavali Petnikota, Vadali V. S. S. Srikanth, Jun Jie Toh, Madhavi Srinivasan, Chowdari V. R. Bobba, Stefan Adams, Mogalahalli V. Reddy, Srikanth Venkata Satya Siva Vadali, Chowdari B.V.R. Electrochemistry-related aspects of safety of graphene-based non-aqueous electrochemical supercapacitors: a case study with MgO-decorated few-layer graphene as an electrode material. New Journal of Chemistry. 2019; 43 (25):9793-9801.

Chicago/Turabian Style

Shaikshavali Petnikota; Vadali V. S. S. Srikanth; Jun Jie Toh; Madhavi Srinivasan; Chowdari V. R. Bobba; Stefan Adams; Mogalahalli V. Reddy; Srikanth Venkata Satya Siva Vadali; Chowdari B.V.R. 2019. "Electrochemistry-related aspects of safety of graphene-based non-aqueous electrochemical supercapacitors: a case study with MgO-decorated few-layer graphene as an electrode material." New Journal of Chemistry 43, no. 25: 9793-9801.

Original paper
Published: 22 October 2018 in Ionics
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Clinopyroxene LiVSi2O6 phase has been synthesised in this study by a single step solid state reaction in argon atmosphere at 900 °C, and its electrochemical properties have been investigated. Graphene composite of the material has also been prepared by assimilating GO (graphene oxide) to the reactants which gets reduced in situ to rGO (reduced graphene oxide) during the annealing process. Structure and morphology of the samples have been characterised by powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and surface area (BET) measurements. Lithium storage properties of the material were examined using galvanostatic cycling, cyclic voltammetry and electrochemical impedance spectroscopy studies. The rGO composite shows better capacity retention than the pristine sample, and an initial discharge capacity of 110 mAh g−1 was obtained for the rGO composite.

ACS Style

A. Shahul Hameed; M. V. Reddy; Siham AlQaradawi; Stefan Adams. Synthesis, structural and lithium storage studies of graphene-LiVSi2O6 composites. Ionics 2018, 25, 1559 -1566.

AMA Style

A. Shahul Hameed, M. V. Reddy, Siham AlQaradawi, Stefan Adams. Synthesis, structural and lithium storage studies of graphene-LiVSi2O6 composites. Ionics. 2018; 25 (4):1559-1566.

Chicago/Turabian Style

A. Shahul Hameed; M. V. Reddy; Siham AlQaradawi; Stefan Adams. 2018. "Synthesis, structural and lithium storage studies of graphene-LiVSi2O6 composites." Ionics 25, no. 4: 1559-1566.

Research article
Published: 12 October 2018 in The Journal of Physical Chemistry C
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In this article, we demonstrate the electrochemical activity of AVP2O7/C (A = Li, Li0.5Na0.5, and Na) prepared by a scalable and easy-to-adopt oxalic dihydrazide assisted solution combustion method for application in sodium-ion batteries (SIBs). A series of compounds thus prepared are found to possess a monoclinic structure consisting of a three-dimensional porous network and sufficient void volume to facilitate facile intercalation/deintercalation of sodium ions. However, among the corresponding composites obtained with Super P carbon, the lithium analog, viz., LiVP2O7/C, demonstrates better electrochemical performance than the rest of the compositions, viz., Li0.5Na0.5VP2O7/C and NaVP2O7/C, when explored as anode in SIBs. In other words, LiVP2O7/C anode exhibits a stable reversible capacity of 125 mA h g–1 at 1 C rate (115 mA g–1) up to 100 cycles. Further, at 1 C rate condition, an acceptable capacity of 90 mA h g–1 has been observed up to 1000 cycles with a Coulombic efficiency of 99%, which is noteworthy. The currently prepared LiVP2O7/C anode validates its suitability for high capacity, long cycle life, and versatile rate capability by way of displaying significant capacity values of 118, 97, 70, 58, 50, and 40 mA h g–1, under the influence of 2, 3, 5, 10, 20, and 40 C rate, respectively. The study reports for the first time about the possibility of exploiting LiVP2O7/C as a potential insertion anode for high-rate SIB applications.

ACS Style

Mani Vellaisamy; Mogalahalli Venkatashamy Reddy; B. V. R. Chowdari; Nallathamby Kalaiselvi. Exploration of AVP2O7/C (A = Li, Li0.5Na0.5, and Na) for High-Rate Sodium-Ion Battery Applications. The Journal of Physical Chemistry C 2018, 122, 24609 -24618.

AMA Style

Mani Vellaisamy, Mogalahalli Venkatashamy Reddy, B. V. R. Chowdari, Nallathamby Kalaiselvi. Exploration of AVP2O7/C (A = Li, Li0.5Na0.5, and Na) for High-Rate Sodium-Ion Battery Applications. The Journal of Physical Chemistry C. 2018; 122 (43):24609-24618.

Chicago/Turabian Style

Mani Vellaisamy; Mogalahalli Venkatashamy Reddy; B. V. R. Chowdari; Nallathamby Kalaiselvi. 2018. "Exploration of AVP2O7/C (A = Li, Li0.5Na0.5, and Na) for High-Rate Sodium-Ion Battery Applications." The Journal of Physical Chemistry C 122, no. 43: 24609-24618.

Journal article
Published: 06 July 2018 in Solid State Sciences
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Rutile titanium dioxide is a promising negative electrode material for lithium-ion batteries due to low volume change on lithium-ion insertion, fast ion diffusion, and large surface area. However, the low theoretical capacity and conductivity of titanium dioxide has limited its application. In this work, rutile TiO2 was synthesized using a batch hydrothermal method, and doped with Nb5+ (3.5 at%). cycling in the range 1.0–3.0 V vs Li/Li+ was used to determine the Li-ion capacity of the doped and pristine TiO2 material, and electrochemical cycling was used to measure the extent of conversion from the lithiated to de-lithiated state. The nanoscale structures of the pristine and doped materials were determined by powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and Brunauer-Emmett-Teller surface area measurements. Cycling in the range 1.0–3.0 V vs Li/Li+ showed that Nb5+ doping into the structure resulted in higher charge capacities. After 100 cycles at 100 mA g−1, the Nb-doped rutile TiO2 maintained a capacity of ca. 390 mAh g−1, 64% higher than undoped TiO2. For electrochemical cycling in the range 0.05–3.0 V vs Li/Li+, the introduction of Nb5+ resulted in a higher conversion of rutile TiO2 from the lithiated to de-lithiated state. The higher capacity of the doped TiO2 is shown to be mainly due to the smaller particle size, optimized surface area, and orientation of the nanorods.

ACS Style

Aleksandra J. Gardecka; Mechthild Lübke; Ceilidh F. Armer; Ding Ning; M.V. Reddy; Alan S. Williams; Adrian Lowe; Zhaolin Liu; Ivan P. Parkin; Jawwad A. Darr. Nb-doped rutile titanium dioxide nanorods for lithium-ion batteries. Solid State Sciences 2018, 83, 115 -121.

AMA Style

Aleksandra J. Gardecka, Mechthild Lübke, Ceilidh F. Armer, Ding Ning, M.V. Reddy, Alan S. Williams, Adrian Lowe, Zhaolin Liu, Ivan P. Parkin, Jawwad A. Darr. Nb-doped rutile titanium dioxide nanorods for lithium-ion batteries. Solid State Sciences. 2018; 83 ():115-121.

Chicago/Turabian Style

Aleksandra J. Gardecka; Mechthild Lübke; Ceilidh F. Armer; Ding Ning; M.V. Reddy; Alan S. Williams; Adrian Lowe; Zhaolin Liu; Ivan P. Parkin; Jawwad A. Darr. 2018. "Nb-doped rutile titanium dioxide nanorods for lithium-ion batteries." Solid State Sciences 83, no. : 115-121.

Research article
Published: 15 June 2018 in ACS Omega
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Carbon-encapsulated LiFePO4 (LFP) nanochains were prepared as a cathode material for lithium batteries by sol–gel method using citric acid as the carbon source. The prepared LFP/C material is characterized by structural, morphological, and electrochemical characterization. LFP/C shows an orthorhombic olivine structure with “Pnma” space group having an average particle size of 50 nm. The uniform distribution of LFP particles coated by the carbon matrix as a nanochain array has been analyzed by scanning electron microscopy and transmission electron microscopy analysis of the sample. The electrochemical performance of the LFP/C nanochain has been analyzed using galvanostatic cycling, cyclic voltammetry, and impedance analysis of the assembled batteries. The sol–gel-derived LFP/C nanochain exhibits better capacity and electrochemical reversibility in line with the literature results. The high-temperature conductivity profile of the sample has been recorded from room temperature to 473 K using impedance analysis of the sample. The transport dynamics have been analyzed using the dielectric and modulus spectra of the sample. A maximum conductivity up to 6.74 × 10–4 S cm–1 has been obtained for the samples at higher temperature (448 K). The nucleation and growth at higher temperature act as factors to facilitate the intermediate phase existence in the LiFePO4 sample in which the phase change that occurs above 400 K gives irreversible electrochemical changes in the LFP/C samples.

ACS Style

K. P. Abhilash; P. Christopher Selvin; B. Nalini; Hui Xia; Stefan Adams; M. V. Reddy. Electrochemical Analysis of the Carbon-Encapsulated Lithium Iron Phosphate Nanochains and Their High-Temperature Conductivity Profiles. ACS Omega 2018, 3, 6446 -6455.

AMA Style

K. P. Abhilash, P. Christopher Selvin, B. Nalini, Hui Xia, Stefan Adams, M. V. Reddy. Electrochemical Analysis of the Carbon-Encapsulated Lithium Iron Phosphate Nanochains and Their High-Temperature Conductivity Profiles. ACS Omega. 2018; 3 (6):6446-6455.

Chicago/Turabian Style

K. P. Abhilash; P. Christopher Selvin; B. Nalini; Hui Xia; Stefan Adams; M. V. Reddy. 2018. "Electrochemical Analysis of the Carbon-Encapsulated Lithium Iron Phosphate Nanochains and Their High-Temperature Conductivity Profiles." ACS Omega 3, no. 6: 6446-6455.

Research article
Published: 13 March 2018 in ACS Omega
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Pristine trivanadate (LiV3O8) and doped lithium trivanadate (LiV3–xMxO8, M = Zn/Co/Fe/Sn/Ti/Zr/Nb/Mo, x = 0.01/0.05/0.1 M) compounds were prepared by a simple reflux method in the presence of the polymer, Pluronic P123, as the chelating agent. For comparison, pristine LiV3O8 alone was also prepared in the absence of the chelating agent. The Rietveld-refined X-ray diffraction patterns shows all compounds to exist in the layered monoclinic LiV3O8 phase belonging to the space group of P21/m. Scanning electron microscopy analysis shows the particles to exhibit layers of submicron-sized particles. The electrochemical performances of the coin cells were compared at a current density of 30 mA/g in the voltage window of 2–4 V. The cells made with compounds LiV2.99Zr0.01O8 and LiV2.95Sn0.05O8 show a high discharge capacity of 245 ± 5 mA h/g, with an excellent stability of 98% at the end of the 50th cycle. The second cycle discharge capacity of 398 mA h/g was obtained for the compound LiV2.99Fe0.01O8, and its capacity retention was found to be 58% after 50 cycles. The electrochemical performances of the cells were correlated with the electrical properties and the changes in the structural parameters of the compounds.

ACS Style

P. Senthil Kumar; Sakunthala Ayyasamy; Eng Soon Tok; Stefan Adams; M. V. Reddy. Impact of Electrical Conductivity on the Electrochemical Performances of Layered Structure Lithium Trivanadate (LiV3–xMxO8, M= Zn/Co/Fe/Sn/Ti/Zr/Nb/Mo, x = 0.01–0.1) as Cathode Materials for Energy Storage. ACS Omega 2018, 3, 3036 -3044.

AMA Style

P. Senthil Kumar, Sakunthala Ayyasamy, Eng Soon Tok, Stefan Adams, M. V. Reddy. Impact of Electrical Conductivity on the Electrochemical Performances of Layered Structure Lithium Trivanadate (LiV3–xMxO8, M= Zn/Co/Fe/Sn/Ti/Zr/Nb/Mo, x = 0.01–0.1) as Cathode Materials for Energy Storage. ACS Omega. 2018; 3 (3):3036-3044.

Chicago/Turabian Style

P. Senthil Kumar; Sakunthala Ayyasamy; Eng Soon Tok; Stefan Adams; M. V. Reddy. 2018. "Impact of Electrical Conductivity on the Electrochemical Performances of Layered Structure Lithium Trivanadate (LiV3–xMxO8, M= Zn/Co/Fe/Sn/Ti/Zr/Nb/Mo, x = 0.01–0.1) as Cathode Materials for Energy Storage." ACS Omega 3, no. 3: 3036-3044.

Research article
Published: 26 January 2018 in Langmuir
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This article reports synthesis of cuprous oxide (Cu2O) and cupric oxide (CuO) nanowires by controlling calcination environment of electrospun polymeric nanofibers and their charge storage properties. The Cu2O nanowires showed higher surface area (86 m2 g-1) and pore size than the CuO nanowires (36 m2 g-1). Electrochemical analysis was carried out in 6 M KOH and both the electrodes showed battery-type charge storage mechanism. The electrospun Cu2O electrodes delivered high discharge capacity (126 mA h g-1) than CuO (72 mA h g-1) at a current density of 2.4 mA cm-2. Electrochemical impedance spectroscopy measurements show almost similar charge transfer resistance in Cu2O (1.2 Ω) and CuO (1.6 Ω); however, Cu2O showed an order of magnitude higher ion diffusion. The difference in charge storage between these electrodes is attributed to the difference in surface properties and charge kinetics at the electrode. The electrode also shows superior cyclic stability (98%) and coulombic efficiency (98%) after 5000 cycles.

ACS Style

Midhun Harilal; Syam G. Krishnan; Bhupender Pal; Mogalahalli Venkatashamy Reddy; Mohd Hasbi Ab. Rahim; Mashitah Mohd Yusoff; Rajan Jose. Environment-Modulated Crystallization of Cu2O and CuO Nanowires by Electrospinning and Their Charge Storage Properties. Langmuir 2018, 34, 1873 -1882.

AMA Style

Midhun Harilal, Syam G. Krishnan, Bhupender Pal, Mogalahalli Venkatashamy Reddy, Mohd Hasbi Ab. Rahim, Mashitah Mohd Yusoff, Rajan Jose. Environment-Modulated Crystallization of Cu2O and CuO Nanowires by Electrospinning and Their Charge Storage Properties. Langmuir. 2018; 34 (5):1873-1882.

Chicago/Turabian Style

Midhun Harilal; Syam G. Krishnan; Bhupender Pal; Mogalahalli Venkatashamy Reddy; Mohd Hasbi Ab. Rahim; Mashitah Mohd Yusoff; Rajan Jose. 2018. "Environment-Modulated Crystallization of Cu2O and CuO Nanowires by Electrospinning and Their Charge Storage Properties." Langmuir 34, no. 5: 1873-1882.

Research article
Published: 21 September 2017 in The Journal of Physical Chemistry C
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ACS Style

Midhun Harilal; Syam G. Krishnan; Asfand Yar; Izan Izwan Misnon; M. Venkatashamy Reddy; Mashitah M. Yusoff; John Ojur Dennis; Rajan Jose. Pseudocapacitive Charge Storage in Single-Step-Synthesized CoO–MnO2–MnCo2O4 Hybrid Nanowires in Aqueous Alkaline Electrolytes. The Journal of Physical Chemistry C 2017, 121, 21171 -21183.

AMA Style

Midhun Harilal, Syam G. Krishnan, Asfand Yar, Izan Izwan Misnon, M. Venkatashamy Reddy, Mashitah M. Yusoff, John Ojur Dennis, Rajan Jose. Pseudocapacitive Charge Storage in Single-Step-Synthesized CoO–MnO2–MnCo2O4 Hybrid Nanowires in Aqueous Alkaline Electrolytes. The Journal of Physical Chemistry C. 2017; 121 (39):21171-21183.

Chicago/Turabian Style

Midhun Harilal; Syam G. Krishnan; Asfand Yar; Izan Izwan Misnon; M. Venkatashamy Reddy; Mashitah M. Yusoff; John Ojur Dennis; Rajan Jose. 2017. "Pseudocapacitive Charge Storage in Single-Step-Synthesized CoO–MnO2–MnCo2O4 Hybrid Nanowires in Aqueous Alkaline Electrolytes." The Journal of Physical Chemistry C 121, no. 39: 21171-21183.

Original paper
Published: 20 September 2017 in Journal of Solid State Electrochemistry
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In this project, we synthesized TiO2 compounds through the molten salt method (MSM) using Ti(IV) oxysulfate, as the Ti source. Molten salts in the ratio of 0.375 M LiNO3:0.180 M NaNO3:0.445 M KNO3 were added and heated at temperatures of 145, 280, 380, and 480 °C for 2 h in air, respectively. A part of the sample prepared at 145 °C was further reheated to 850 °C for 2 h in air. X-ray diffraction studies showed that the amorphous phase was obtained when the sample was prepared at 145 °C, and polycrystalline to crystalline anatase phase was formed when heated from 280 to 850 °C, which is complementary to the results of selected area electron diffraction studies. Electrochemical properties were studied using galvanostatic cycling, cyclic voltammetry, and electrochemical impedance spectroscopy at a current density of 33 mA g−1 (0.1 C rate) and a scan rate of 0.058 mV s−1, in the voltage range 1.0–2.8 V vs. Li. Electrochemical cycling profiles for the amorphous TiO2 samples prepared at 145 °C showed single-phase reaction with a low reversible capacity of 65 mAh g−1, whereas compounds prepared at 280 °C and above showed a two-phase reaction of Li-poor and Li-rich regions with a reversible capacity of 200 mAh g−1. TiO2 produced at 280 °C showed the lowest capacity fading and the lowest impedance value among the investigated samples.

ACS Style

M. V. Reddy; T. Y. Aloysius Chan; S. Adams. Effect of molten salt synthesis temperature on TiO2 and Li cycling properties. Journal of Solid State Electrochemistry 2017, 22, 429 -439.

AMA Style

M. V. Reddy, T. Y. Aloysius Chan, S. Adams. Effect of molten salt synthesis temperature on TiO2 and Li cycling properties. Journal of Solid State Electrochemistry. 2017; 22 (2):429-439.

Chicago/Turabian Style

M. V. Reddy; T. Y. Aloysius Chan; S. Adams. 2017. "Effect of molten salt synthesis temperature on TiO2 and Li cycling properties." Journal of Solid State Electrochemistry 22, no. 2: 429-439.

Journals
Published: 13 September 2017 in Dalton Trans.
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Carbon nanospheres prepared from Lablab purpureus using a green approach showed high capacitance (300 F g−1) and stability (94%).

ACS Style

Gomaa A. M. Ali; A. Divyashree; S. Supriya; Kwok Feng Chong; Anita S. Ethiraj; M. V. Reddy; H. Algarni; Gurumurthy Hegde. Carbon nanospheres derived from Lablab purpureus for high performance supercapacitor electrodes: a green approach. Dalton Trans. 2017, 46, 14034 -14044.

AMA Style

Gomaa A. M. Ali, A. Divyashree, S. Supriya, Kwok Feng Chong, Anita S. Ethiraj, M. V. Reddy, H. Algarni, Gurumurthy Hegde. Carbon nanospheres derived from Lablab purpureus for high performance supercapacitor electrodes: a green approach. Dalton Trans.. 2017; 46 (40):14034-14044.

Chicago/Turabian Style

Gomaa A. M. Ali; A. Divyashree; S. Supriya; Kwok Feng Chong; Anita S. Ethiraj; M. V. Reddy; H. Algarni; Gurumurthy Hegde. 2017. "Carbon nanospheres derived from Lablab purpureus for high performance supercapacitor electrodes: a green approach." Dalton Trans. 46, no. 40: 14034-14044.