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Indranil Bhattacharya
Department of Electrical and Computer Engineering, Tennessee Technological University, Cookeville, TN 38505, USA

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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: 17 March 2021 in Electrochimica Acta
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Here, we report a wet synthesis-based titanium doping strategy to improve the structural stability and electrochemical performances, such as cycling stability and rate capability, of P2-type Na0.67Fe0.5Mn0.5O2 layered oxide cathodes. Through Ti4+ doping aimed at replacing some of the Mn and Fe atoms in the crystal structure, effective mitigation of the Jahn Teller distortion caused by active Mn3+ before charging and Fe4+ after charging was achieved. X-ray diffraction (XRD), Raman spectroscopy, Electrochemical Impedance Spectroscopy (EIS) and Mössbauer spectroscopy were used to investigate the effects of the Ti4+ dopant before and after cycling. It was observed that Ti4+ doping increased the Na layer thickness, minimized the lattice volume strain, showed better structural stability, minimally decreased Fe migration to the Na layer, and lowered charge transfer resistance in these P2-type cathodes. Overall, our reported synthesis methodology and electrochemical characterizations highlight the feasibility of Ti doping in sodium layered oxide P2-type cathodes.

ACS Style

Devendrasinh Darbar; Nitin Muralidharan; Raphaël P. Hermann; Jagjit Nanda; Indranil Bhattacharya. Evaluation of electrochemical performance and redox activity of Fe in Ti doped layered P2-Na0.67Mn0.5Fe0.5O2 cathode for sodium ion batteries. Electrochimica Acta 2021, 380, 138156 .

AMA Style

Devendrasinh Darbar, Nitin Muralidharan, Raphaël P. Hermann, Jagjit Nanda, Indranil Bhattacharya. Evaluation of electrochemical performance and redox activity of Fe in Ti doped layered P2-Na0.67Mn0.5Fe0.5O2 cathode for sodium ion batteries. Electrochimica Acta. 2021; 380 ():138156.

Chicago/Turabian Style

Devendrasinh Darbar; Nitin Muralidharan; Raphaël P. Hermann; Jagjit Nanda; Indranil Bhattacharya. 2021. "Evaluation of electrochemical performance and redox activity of Fe in Ti doped layered P2-Na0.67Mn0.5Fe0.5O2 cathode for sodium ion batteries." Electrochimica Acta 380, no. : 138156.

Journal article
Published: 01 April 2018 in Electrochimica Acta
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Sodium ion battery (SIB) technology is a promising technology for energy storage systems. Due to the abundance of sodium in nature and lower cost, it can be a viable alternative to the current Lithium ion battery (LIB) technology. In this research article P2-type layered sodium ion transition metal oxide Na0.7Ni0.3Mn0.59Co0.1Cu0.01O2 cathode material was synthesized using a citric acid assisted sol-gel method. It provided a very good reversible discharge capacity and better capacity retention than the state-of-the- art SIB. XRD pattern confirmed the successful insertion of copper ions in the lattice structure of Na-Ni-Co-Mn layered oxide. This material exhibited a high reversible capacity of 150 mAh/gm vs Na+ as the counter electrode when discharged through the voltage window of 4–1.5 V. The lesser polarization loss during cycling of the proposed cathode material helped to retain 94% of its maximum discharge capacity even after 80 cycles.

ACS Style

Bibek Tiwari; Indranil Bhattacharya. Layered P2- type novel Na0.7Ni0.3Mn0.59Co0.1Cu0.01O2 cathode material for high-capacity & stable rechargeable sodium ion battery. Electrochimica Acta 2018, 270, 363 -368.

AMA Style

Bibek Tiwari, Indranil Bhattacharya. Layered P2- type novel Na0.7Ni0.3Mn0.59Co0.1Cu0.01O2 cathode material for high-capacity & stable rechargeable sodium ion battery. Electrochimica Acta. 2018; 270 ():363-368.

Chicago/Turabian Style

Bibek Tiwari; Indranil Bhattacharya. 2018. "Layered P2- type novel Na0.7Ni0.3Mn0.59Co0.1Cu0.01O2 cathode material for high-capacity & stable rechargeable sodium ion battery." Electrochimica Acta 270, no. : 363-368.

Journal article
Published: 01 December 2016 in Solar Energy
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ACS Style

Mohammad Jobayer Hossain; Bibek Tiwari; Indranil Bhattacharya. Novel high efficiency quadruple junction solar cell with current matching and quantum efficiency simulations. Solar Energy 2016, 139, 100 -107.

AMA Style

Mohammad Jobayer Hossain, Bibek Tiwari, Indranil Bhattacharya. Novel high efficiency quadruple junction solar cell with current matching and quantum efficiency simulations. Solar Energy. 2016; 139 ():100-107.

Chicago/Turabian Style

Mohammad Jobayer Hossain; Bibek Tiwari; Indranil Bhattacharya. 2016. "Novel high efficiency quadruple junction solar cell with current matching and quantum efficiency simulations." Solar Energy 139, no. : 100-107.