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Dr. Haegyeom Kim
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley 94720, USA

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0 Batteries
0 Energy Storage
0 Fuel Cells
0 Inorganic Chemistry
0 Synthesis

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Short Biography

Haegyeom Kim is a career-track staff scientist in the Materials Sciences Division of Lawrence Berkeley National Laboratory. He received his PhD degree from Seoul National University on graphite derivatives for energy storage in 2015. He has published more than 75 papers in the field of rechargeable batteries, including alkali-ion batteries and solid-state batteries. Dr. Kim’s papers have been cited over 10,000 times and he was among the select group of people chosen as Highly Cited Researchers in 2019.

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Journal article
Published: 16 August 2021 in Journal of Materials Chemistry A
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Combined computational materials screening and experimental investigation discovers four K polyanions as potential high-voltage K cathode materials.

ACS Style

Jingyang Wang; Bin Ouyang; Hyunchul Kim; YaoSen Tian; Gerbrand Ceder; Haegyeom Kim. Computational and experimental search for potential polyanionic K-ion cathode materials. Journal of Materials Chemistry A 2021, 1 .

AMA Style

Jingyang Wang, Bin Ouyang, Hyunchul Kim, YaoSen Tian, Gerbrand Ceder, Haegyeom Kim. Computational and experimental search for potential polyanionic K-ion cathode materials. Journal of Materials Chemistry A. 2021; ():1.

Chicago/Turabian Style

Jingyang Wang; Bin Ouyang; Hyunchul Kim; YaoSen Tian; Gerbrand Ceder; Haegyeom Kim. 2021. "Computational and experimental search for potential polyanionic K-ion cathode materials." Journal of Materials Chemistry A , no. : 1.

Review
Published: 02 August 2021 in Electrochem
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All-solid-state batteries have emerged as promising alternatives to conventional Li-ion batteries owing to their higher energy density and safety, which stem from their use of inorganic solid-state electrolytes instead of flammable organic liquid electrolytes. Among various candidates, sulfide solid-state electrolytes are particularly promising for the development of high-energy all-solid-state Li metal batteries because of their high ionic conductivity and deformability. However, a significant challenge remains as their inherent instability in contact with electrodes forms unstable interfaces and interphases, leading to degradation of the battery performance. In this review article, we provide an overview of the key issues for the interfaces and interphases of sulfide solid-state electrolyte systems as well as recent progress in understanding such interface and interphase formation and potential solutions to stabilize them. In addition, we provide perspectives on future research directions in this field.

ACS Style

Young-Woon Byeon; Haegyeom Kim. Review on Interface and Interphase Issues in Sulfide Solid-State Electrolytes for All-Solid-State Li-Metal Batteries. Electrochem 2021, 2, 452 -471.

AMA Style

Young-Woon Byeon, Haegyeom Kim. Review on Interface and Interphase Issues in Sulfide Solid-State Electrolytes for All-Solid-State Li-Metal Batteries. Electrochem. 2021; 2 (3):452-471.

Chicago/Turabian Style

Young-Woon Byeon; Haegyeom Kim. 2021. "Review on Interface and Interphase Issues in Sulfide Solid-State Electrolytes for All-Solid-State Li-Metal Batteries." Electrochem 2, no. 3: 452-471.

Review
Published: 26 May 2021 in Molecules
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Layered intercalation compounds are the dominant cathode materials for rechargeable Li-ion batteries. In this article we summarize in a pedagogical way our work in understanding how the structure’s topology, electronic structure, and chemistry interact to determine its electrochemical performance. We discuss how alkali–alkali interactions within the Li layer influence the voltage profile, the role of the transition metal electronic structure in dictating O3-structural stability, and the mechanism for alkali diffusion. We then briefly delve into emerging, next-generation Li-ion cathodes that move beyond layered intercalation hosts by discussing disordered rocksalt Li-excess structures, a class of materials which may be essential in circumventing impending resource limitations in our era of clean energy technology.

ACS Style

Julia Yang; Haegyeom Kim; Gerbrand Ceder. Insights into Layered Oxide Cathodes for Rechargeable Batteries. Molecules 2021, 26, 3173 .

AMA Style

Julia Yang, Haegyeom Kim, Gerbrand Ceder. Insights into Layered Oxide Cathodes for Rechargeable Batteries. Molecules. 2021; 26 (11):3173.

Chicago/Turabian Style

Julia Yang; Haegyeom Kim; Gerbrand Ceder. 2021. "Insights into Layered Oxide Cathodes for Rechargeable Batteries." Molecules 26, no. 11: 3173.

Review article
Published: 19 May 2021 in Materials Horizons
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We review recent progress in the development of self-driving laboratories and discuss their application to autonomous inorganic materials synthesis.

ACS Style

Nathan J. Szymanski; Yan Zeng; Haoyan Huo; Christopher J. Bartel; Haegyeom Kim; Gerbrand Ceder. Toward autonomous design and synthesis of novel inorganic materials. Materials Horizons 2021, 1 .

AMA Style

Nathan J. Szymanski, Yan Zeng, Haoyan Huo, Christopher J. Bartel, Haegyeom Kim, Gerbrand Ceder. Toward autonomous design and synthesis of novel inorganic materials. Materials Horizons. 2021; ():1.

Chicago/Turabian Style

Nathan J. Szymanski; Yan Zeng; Haoyan Huo; Christopher J. Bartel; Haegyeom Kim; Gerbrand Ceder. 2021. "Toward autonomous design and synthesis of novel inorganic materials." Materials Horizons , no. : 1.

Review article
Published: 24 December 2020 in Chemical Reviews
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The tremendous improvement in performance and cost of lithium-ion batteries (LIBs) have made them the technology of choice for electrical energy storage. While established battery chemistries and cell architectures for Li-ion batteries achieve good power and energy density, LIBs are unlikely to meet all the performance, cost, and scaling targets required for energy storage, in particular, in large-scale applications such as electrified transportation and grids. The demand to further reduce cost and/or increase energy density, as well as the growing concern related to natural resource needs for Li-ion have accelerated the investigation of so-called “beyond Li-ion” technologies. In this review, we will discuss the recent achievements, challenges, and opportunities of four important “beyond Li-ion” technologies: Na-ion batteries, K-ion batteries, all-solid-state batteries, and multivalent batteries. The fundamental science behind the challenges, and potential solutions toward the goals of a low-cost and/or high-energy-density future, are discussed in detail for each technology. While it is unlikely that any given new technology will fully replace Li-ion in the near future, “beyond Li-ion” technologies should be thought of as opportunities for energy storage to grow into mid/large-scale applications.

ACS Style

YaoSen Tian; Guobo Zeng; Ann Rutt; Tan Shi; Haegyeom Kim; Jingyang Wang; Julius Koettgen; Yingzhi Sun; Bin Ouyang; Tina Chen; Zhengyan Lun; Ziqin Rong; Kristin Persson; Gerbrand Ceder. Promises and Challenges of Next-Generation “Beyond Li-ion” Batteries for Electric Vehicles and Grid Decarbonization. Chemical Reviews 2020, 121, 1623 -1669.

AMA Style

YaoSen Tian, Guobo Zeng, Ann Rutt, Tan Shi, Haegyeom Kim, Jingyang Wang, Julius Koettgen, Yingzhi Sun, Bin Ouyang, Tina Chen, Zhengyan Lun, Ziqin Rong, Kristin Persson, Gerbrand Ceder. Promises and Challenges of Next-Generation “Beyond Li-ion” Batteries for Electric Vehicles and Grid Decarbonization. Chemical Reviews. 2020; 121 (3):1623-1669.

Chicago/Turabian Style

YaoSen Tian; Guobo Zeng; Ann Rutt; Tan Shi; Haegyeom Kim; Jingyang Wang; Julius Koettgen; Yingzhi Sun; Bin Ouyang; Tina Chen; Zhengyan Lun; Ziqin Rong; Kristin Persson; Gerbrand Ceder. 2020. "Promises and Challenges of Next-Generation “Beyond Li-ion” Batteries for Electric Vehicles and Grid Decarbonization." Chemical Reviews 121, no. 3: 1623-1669.

Journal article
Published: 12 October 2020 in Nature Materials
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High-entropy (HE) ceramics, by analogy with HE metallic alloys, are an emerging class of solid solutions composed of a large number of species. These materials offer the benefit of large compositional flexibility and can be used in a wide variety of applications, including thermoelectrics, catalysts, superionic conductors and battery electrodes. We show here that the HE concept can lead to very substantial improvements in performance in battery cathodes. Among lithium-ion cathodes, cation-disordered rocksalt (DRX)-type materials are an ideal platform within which to design HE materials because of their demonstrated chemical flexibility. By comparing a group of DRX cathodes containing two, four or six transition metal (TM) species, we show that short-range order systematically decreases, whereas energy density and rate capability systematically increase, as more TM cation species are mixed together, despite the total metal content remaining fixed. A DRX cathode with six TM species achieves 307 mAh g−1 (955 Wh kg−1) at a low rate (20 mA g−1), and retains more than 170 mAh g−1 when cycling at a high rate of 2,000 mA g−1. To facilitate further design in this HE DRX space, we also present a compatibility analysis of 23 different TM ions, and successfully synthesize a phase-pure HE DRX compound containing 12 TM species as a proof of concept. High-entropy ceramics are solid solutions offering compositional flexibility and wide variety of applicability. High-entropy concepts are shown to lead to substantial performance improvement in cation-disordered rocksalt-type cathodes for Li-ion batteries.

ACS Style

Zhengyan Lun; Bin Ouyang; Deok-Hwang Kwon; Yang Ha; Emily E. Foley; Tzu-Yang Huang; Zijian Cai; Hyunchul Kim; Mahalingam Balasubramanian; Yingzhi Sun; Jianping Huang; YaoSen Tian; Haegyeom Kim; Bryan D. McCloskey; Wanli Yang; Raphaële J. Clément; Huiwen Ji; Gerbrand Ceder. Cation-disordered rocksalt-type high-entropy cathodes for Li-ion batteries. Nature Materials 2020, 20, 214 -221.

AMA Style

Zhengyan Lun, Bin Ouyang, Deok-Hwang Kwon, Yang Ha, Emily E. Foley, Tzu-Yang Huang, Zijian Cai, Hyunchul Kim, Mahalingam Balasubramanian, Yingzhi Sun, Jianping Huang, YaoSen Tian, Haegyeom Kim, Bryan D. McCloskey, Wanli Yang, Raphaële J. Clément, Huiwen Ji, Gerbrand Ceder. Cation-disordered rocksalt-type high-entropy cathodes for Li-ion batteries. Nature Materials. 2020; 20 (2):214-221.

Chicago/Turabian Style

Zhengyan Lun; Bin Ouyang; Deok-Hwang Kwon; Yang Ha; Emily E. Foley; Tzu-Yang Huang; Zijian Cai; Hyunchul Kim; Mahalingam Balasubramanian; Yingzhi Sun; Jianping Huang; YaoSen Tian; Haegyeom Kim; Bryan D. McCloskey; Wanli Yang; Raphaële J. Clément; Huiwen Ji; Gerbrand Ceder. 2020. "Cation-disordered rocksalt-type high-entropy cathodes for Li-ion batteries." Nature Materials 20, no. 2: 214-221.

Journal article
Published: 24 July 2020 in Journal of The Electrochemical Society
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Potassium vanadium fluorophosphate (KVPO4F) is one of the most promising cathode candidates for K-ion batteries because of its high specific capacity, voltage, and energy density. However, reducing its capacity fade remains an important challenge. This work leverages structure and electrochemical analysis to understand the capacity degradation mechanism of the KVPO4F cathode. Interestingly, no structural degradation of the KVPO4F cathode is detected after 200 cycles in the wide voltage window of 5.0–2.5 V (vs K/K+). Instead, the capacity degradation is attributed to electrolyte decomposition at high voltage (>4.5 V vs K/K+), which causes drying of the electrolyte and the formation of insulating layers on the cathode surface, significantly increasing the polarization. The properties of four KPF6- and carbonate-based K electrolytes are compared, and 0.7 M KPF6 in ethylene carbonate/propylene carbonate exhibits the highest oxidation stability and results in the best cycling stability for the KVPO4 cathode. These findings suggest that the key to improving the cycling stability of KVPO4F is to develop novel K electrolytes with even higher oxidation stability.

ACS Style

Haegyeom Kim; YaoSen Tian; Gerbrand Ceder. Origin of Capacity Degradation of High-Voltage KVPO4F Cathode. Journal of The Electrochemical Society 2020, 167, 110555 .

AMA Style

Haegyeom Kim, YaoSen Tian, Gerbrand Ceder. Origin of Capacity Degradation of High-Voltage KVPO4F Cathode. Journal of The Electrochemical Society. 2020; 167 (11):110555.

Chicago/Turabian Style

Haegyeom Kim; YaoSen Tian; Gerbrand Ceder. 2020. "Origin of Capacity Degradation of High-Voltage KVPO4F Cathode." Journal of The Electrochemical Society 167, no. 11: 110555.

Review article
Published: 10 July 2020 in Energy & Environmental Science
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This review provides well-organized and up-to-date information about the key factors influencing the properties and performances of alkali-ion transition metal inorganic cathode materials by encompassing a wide scope from atomic to microscopic levels.

ACS Style

Wontae Lee; Jaeyoung Kim; Soyeong Yun; Woosung Choi; Haegyeom Kim; Won-Sub Yoon. Multiscale factors in designing alkali-ion (Li, Na, and K) transition metal inorganic compounds for next-generation rechargeable batteries. Energy & Environmental Science 2020, 13, 4406 -4449.

AMA Style

Wontae Lee, Jaeyoung Kim, Soyeong Yun, Woosung Choi, Haegyeom Kim, Won-Sub Yoon. Multiscale factors in designing alkali-ion (Li, Na, and K) transition metal inorganic compounds for next-generation rechargeable batteries. Energy & Environmental Science. 2020; 13 (12):4406-4449.

Chicago/Turabian Style

Wontae Lee; Jaeyoung Kim; Soyeong Yun; Woosung Choi; Haegyeom Kim; Won-Sub Yoon. 2020. "Multiscale factors in designing alkali-ion (Li, Na, and K) transition metal inorganic compounds for next-generation rechargeable batteries." Energy & Environmental Science 13, no. 12: 4406-4449.

Full paper
Published: 30 June 2020 in Advanced Energy Materials
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The oxygen stacking of O3-type layered sodium transition metal oxides (O3-NaTMO2) changes dynamically upon topotactic Na extraction and reinsertion. While the phase transition from octahedral to prismatic Na coordination that occurs at intermediate desodiation by transition metal slab gliding is well understood, the structural evolution at high desodiation, crucial to achieve high reversible capacity, remains mostly uncharted. In this work, the phase transitions of O3-type layered NaTMO2 at high voltage are investigated by combining experimental and computational approaches. An OP2-type phase that consists of alternating octahedral and prismatic Na layers is directly observed by in situ X-ray diffraction and high-resolution scanning transmission electron microscopy. The origin of this peculiar phase is explained by atomic interactions involving Jahn–Teller active Fe4+ and distortion tolerant Ti4+ that stabilize the local Na environment. The path-dependent desodiation and resodiation pathways are also rationalized in this material through the different kinetics of the prismatic and octahedral layers, presenting a comprehensive picture about the structural stability of the layered materials upon Na intercalation.

ACS Style

Jae Chul Kim; Deok‐Hwang Kwon; Julia H. Yang; Hyunchul Kim; Shou‐Hang Bo; Lijun Wu; Haegyeom Kim; Dong‐Hwa Seo; Tan Shi; Jingyang Wang; Yimei Zhu; Gerbrand Ceder. Direct Observation of Alternating Octahedral and Prismatic Sodium Layers in O3‐Type Transition Metal Oxides. Advanced Energy Materials 2020, 10, 2001151 .

AMA Style

Jae Chul Kim, Deok‐Hwang Kwon, Julia H. Yang, Hyunchul Kim, Shou‐Hang Bo, Lijun Wu, Haegyeom Kim, Dong‐Hwa Seo, Tan Shi, Jingyang Wang, Yimei Zhu, Gerbrand Ceder. Direct Observation of Alternating Octahedral and Prismatic Sodium Layers in O3‐Type Transition Metal Oxides. Advanced Energy Materials. 2020; 10 (31):2001151.

Chicago/Turabian Style

Jae Chul Kim; Deok‐Hwang Kwon; Julia H. Yang; Hyunchul Kim; Shou‐Hang Bo; Lijun Wu; Haegyeom Kim; Dong‐Hwa Seo; Tan Shi; Jingyang Wang; Yimei Zhu; Gerbrand Ceder. 2020. "Direct Observation of Alternating Octahedral and Prismatic Sodium Layers in O3‐Type Transition Metal Oxides." Advanced Energy Materials 10, no. 31: 2001151.

Journal article
Published: 18 May 2020 in Nature Materials
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In the synthesis of inorganic materials, reactions often yield non-equilibrium kinetic byproducts instead of the thermodynamic equilibrium phase. Understanding the competition between thermodynamics and kinetics is a fundamental step towards the rational synthesis of target materials. Here, we use in situ synchrotron X-ray diffraction to investigate the multistage crystallization pathways of the important two-layer (P2) sodium oxides Na0.67MO2 (M = Co, Mn). We observe a series of fast non-equilibrium phase transformations through metastable three-layer O3, O3′ and P3 phases before formation of the equilibrium two-layer P2 polymorph. We present a theoretical framework to rationalize the observed phase progression, demonstrating that even though P2 is the equilibrium phase, compositionally unconstrained reactions between powder precursors favour the formation of non-equilibrium three-layered intermediates. These insights can guide the choice of precursors and parameters employed in the solid-state synthesis of ceramic materials, and constitutes a step forward in unravelling the complex interplay between thermodynamics and kinetics during materials synthesis.

ACS Style

Matteo Bianchini; Jingyang Wang; Raphaële J. Clément; Bin Ouyang; Penghao Xiao; Daniil Kitchaev; Tan Shi; Yaqian Zhang; Yan Wang; Haegyeom Kim; Mingjian Zhang; Jianming Bai; Feng Wang; Wenhao Sun; Gerbrand Ceder. The interplay between thermodynamics and kinetics in the solid-state synthesis of layered oxides. Nature Materials 2020, 19, 1 -8.

AMA Style

Matteo Bianchini, Jingyang Wang, Raphaële J. Clément, Bin Ouyang, Penghao Xiao, Daniil Kitchaev, Tan Shi, Yaqian Zhang, Yan Wang, Haegyeom Kim, Mingjian Zhang, Jianming Bai, Feng Wang, Wenhao Sun, Gerbrand Ceder. The interplay between thermodynamics and kinetics in the solid-state synthesis of layered oxides. Nature Materials. 2020; 19 (10):1-8.

Chicago/Turabian Style

Matteo Bianchini; Jingyang Wang; Raphaële J. Clément; Bin Ouyang; Penghao Xiao; Daniil Kitchaev; Tan Shi; Yaqian Zhang; Yan Wang; Haegyeom Kim; Mingjian Zhang; Jianming Bai; Feng Wang; Wenhao Sun; Gerbrand Ceder. 2020. "The interplay between thermodynamics and kinetics in the solid-state synthesis of layered oxides." Nature Materials 19, no. 10: 1-8.

Research article
Published: 01 May 2020 in Chemistry of Materials
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This work investigates the electrochemical Na+/K+ ion exchange mechanism occurring in layered Na3Ni2SbO6. Structural characterizations using X-ray diffraction and transmission electron microscopy uncover a remarkable and rich phase evolution as K is inserted in partially desodiated NaxNi2SbO6. Rather than simple addition of K to the structure, we see significant Na rearrangement, with discrete Na phases traversing the full range of Na compositions, even though the overall Na content in the sample is not changed. At any given time as much as three distinct phases can be present in the sample, consistent with thermodynamic equilibrium rules. Using DFT computations we demonstrate that this remarkable phase behavior during ion exchange is due to the repulsion between Na+ and K+ which creates distinct phases of them. Our analysis should be applicable to other ion-exchange systems where the exchanged ions are not well miscible in the host structure.

ACS Style

Haegyeom Kim; Deok-Hwang Kwon; Jae Chul Kim; Bin Ouyang; Hyunchul Kim; Julia Yang; Gerbrand Ceder. Na+ Redistribution by Electrochemical Na+/K+ Exchange in Layered NaxNi2SbO6. Chemistry of Materials 2020, 32, 4312 -4323.

AMA Style

Haegyeom Kim, Deok-Hwang Kwon, Jae Chul Kim, Bin Ouyang, Hyunchul Kim, Julia Yang, Gerbrand Ceder. Na+ Redistribution by Electrochemical Na+/K+ Exchange in Layered NaxNi2SbO6. Chemistry of Materials. 2020; 32 (10):4312-4323.

Chicago/Turabian Style

Haegyeom Kim; Deok-Hwang Kwon; Jae Chul Kim; Bin Ouyang; Hyunchul Kim; Julia Yang; Gerbrand Ceder. 2020. "Na+ Redistribution by Electrochemical Na+/K+ Exchange in Layered NaxNi2SbO6." Chemistry of Materials 32, no. 10: 4312-4323.

Journal article
Published: 09 March 2020 in Nature Energy
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The rapid market growth of rechargeable batteries requires electrode materials that combine high power and energy and are made from earth-abundant elements. Here we show that combining a partial spinel-like cation order and substantial lithium excess enables both dense and fast energy storage. Cation overstoichiometry and the resulting partial order is used to eliminate the phase transitions typical of ordered spinels and enable a larger practical capacity, while lithium excess is synergistically used with fluorine substitution to create a high lithium mobility. With this strategy, we achieved specific energies greater than 1,100 Wh kg–1 and discharge rates up to 20 A g–1. Remarkably, the cathode materials thus obtained from inexpensive manganese present a rare case wherein an excellent rate capability coexists with a reversible oxygen redox activity. Our work shows the potential for designing cathode materials in the vast space between fully ordered and disordered compounds.

ACS Style

Huiwen Ji; Jinpeng Wu; Zijian Cai; Jue Liu; Deok-Hwang Kwon; Hyunchul Kim; Alexander Urban; Joseph K. Papp; Emily Foley; YaoSen Tian; Mahalingam Balasubramanian; Haegyeom Kim; Raphaële J. Clément; Bryan D. McCloskey; Wanli Yang; Gerbrand Ceder. Ultrahigh power and energy density in partially ordered lithium-ion cathode materials. Nature Energy 2020, 5, 213 -221.

AMA Style

Huiwen Ji, Jinpeng Wu, Zijian Cai, Jue Liu, Deok-Hwang Kwon, Hyunchul Kim, Alexander Urban, Joseph K. Papp, Emily Foley, YaoSen Tian, Mahalingam Balasubramanian, Haegyeom Kim, Raphaële J. Clément, Bryan D. McCloskey, Wanli Yang, Gerbrand Ceder. Ultrahigh power and energy density in partially ordered lithium-ion cathode materials. Nature Energy. 2020; 5 (3):213-221.

Chicago/Turabian Style

Huiwen Ji; Jinpeng Wu; Zijian Cai; Jue Liu; Deok-Hwang Kwon; Hyunchul Kim; Alexander Urban; Joseph K. Papp; Emily Foley; YaoSen Tian; Mahalingam Balasubramanian; Haegyeom Kim; Raphaële J. Clément; Bryan D. McCloskey; Wanli Yang; Gerbrand Ceder. 2020. "Ultrahigh power and energy density in partially ordered lithium-ion cathode materials." Nature Energy 5, no. 3: 213-221.

Journal article
Published: 24 October 2019 in Chem
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Summary Mn-based Li-excess cation-disordered rocksalt (DRX) oxyfluorides are promising candidates for next-generation rechargeable battery cathodes owing to their large energy densities, the earth abundance, and low cost of Mn. In this work, we synthesized and electrochemically tested four representative compositions in the Li-Mn-O-F DRX chemical space with various Li and F content. While all compositions achieve higher than 200 mAh g−1 initial capacity and good cyclability, we show that the Li-site distribution plays a more important role than the metal-redox capacity in determining the initial capacity, whereas the metal-redox capacity is more closely related to the cyclability of the materials. We apply these insights and generate a capacity map of the Li-Mn-O-F chemical space, LixMn2-xO2-yFy (1.167 ≤ x ≤ 1.333, 0 ≤ y ≤ 0.667), which predicts both accessible Li capacity and Mn-redox capacity. This map allows the design of compounds that balance high capacity with good cyclability.

ACS Style

Zhengyan Lun; Bin Ouyang; Zijian Cai; Raphaële J. Clément; Deok-Hwang Kwon; Jianping Huang; Joseph K. Papp; Mahalingam Balasubramanian; YaoSen Tian; Bryan D. McCloskey; Huiwen Ji; Haegyeom Kim; Daniil A. Kitchaev; Gerbrand Ceder. Design Principles for High-Capacity Mn-Based Cation-Disordered Rocksalt Cathodes. Chem 2019, 6, 153 -168.

AMA Style

Zhengyan Lun, Bin Ouyang, Zijian Cai, Raphaële J. Clément, Deok-Hwang Kwon, Jianping Huang, Joseph K. Papp, Mahalingam Balasubramanian, YaoSen Tian, Bryan D. McCloskey, Huiwen Ji, Haegyeom Kim, Daniil A. Kitchaev, Gerbrand Ceder. Design Principles for High-Capacity Mn-Based Cation-Disordered Rocksalt Cathodes. Chem. 2019; 6 (1):153-168.

Chicago/Turabian Style

Zhengyan Lun; Bin Ouyang; Zijian Cai; Raphaële J. Clément; Deok-Hwang Kwon; Jianping Huang; Joseph K. Papp; Mahalingam Balasubramanian; YaoSen Tian; Bryan D. McCloskey; Huiwen Ji; Haegyeom Kim; Daniil A. Kitchaev; Gerbrand Ceder. 2019. "Design Principles for High-Capacity Mn-Based Cation-Disordered Rocksalt Cathodes." Chem 6, no. 1: 153-168.

Correction
Published: 22 October 2019 in Advanced Functional Materials
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Haegyeom Kim; Yuji Ishado; YaoSen Tian; Gerbrand Ceder. Investigation of Alkali‐Ion (Li, Na, and K) Intercalation in K x VPO 4 F (x ∼ 0) Cathode. Advanced Functional Materials 2019, 29, 1 .

AMA Style

Haegyeom Kim, Yuji Ishado, YaoSen Tian, Gerbrand Ceder. Investigation of Alkali‐Ion (Li, Na, and K) Intercalation in K x VPO 4 F (x ∼ 0) Cathode. Advanced Functional Materials. 2019; 29 (43):1.

Chicago/Turabian Style

Haegyeom Kim; Yuji Ishado; YaoSen Tian; Gerbrand Ceder. 2019. "Investigation of Alkali‐Ion (Li, Na, and K) Intercalation in K x VPO 4 F (x ∼ 0) Cathode." Advanced Functional Materials 29, no. 43: 1.

Journal article
Published: 01 October 2019 in Trends in Chemistry
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ACS Style

Haegyeom Kim; Huiwen Ji; Jingyang Wang; Gerbrand Ceder. Next-Generation Cathode Materials for Non-aqueous Potassium-Ion Batteries. Trends in Chemistry 2019, 1, 682 -692.

AMA Style

Haegyeom Kim, Huiwen Ji, Jingyang Wang, Gerbrand Ceder. Next-Generation Cathode Materials for Non-aqueous Potassium-Ion Batteries. Trends in Chemistry. 2019; 1 (7):682-692.

Chicago/Turabian Style

Haegyeom Kim; Huiwen Ji; Jingyang Wang; Gerbrand Ceder. 2019. "Next-Generation Cathode Materials for Non-aqueous Potassium-Ion Batteries." Trends in Chemistry 1, no. 7: 682-692.

Full paper
Published: 20 June 2019 in Advanced Functional Materials
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This work compares the intercalation of K, Na, and Li in Kx VPO4F (x ∼ 0). The Kx VPO4F (x ∼ 0) cathode delivers reversible capacities of ≈90–100 mAh g−1 in K, Na, and Li cells, at an average voltage of ≈4.33 V for K, ≈3.98 V for Na, and ≈3.96 V for Li. This is so far the highest average voltage known for a K‐intercalation cathode. The lower voltage of Li insertion compared to Na is attributable to undercoordinated Li ions in the Kx VPO4F (x ∼ 0) framework. While the material shows high rate capability for all the alkali ions, Li migration in Kx VPO4F (x ∼ 0) is more difficult than with Na and K. This work suggests that a large cavity is not always good for insertion of alkali ions and cathode materials need to be suitably tailored to each intercalating ion species.

ACS Style

Haegyeom Kim; Yuji Ishado; YaoSen Tian; Gerbrand Ceder. Investigation of Alkali‐Ion (Li, Na, and K) Intercalation in K x VPO 4 F ( x ∼ 0) Cathode. Advanced Functional Materials 2019, 29, 1 .

AMA Style

Haegyeom Kim, Yuji Ishado, YaoSen Tian, Gerbrand Ceder. Investigation of Alkali‐Ion (Li, Na, and K) Intercalation in K x VPO 4 F ( x ∼ 0) Cathode. Advanced Functional Materials. 2019; 29 (34):1.

Chicago/Turabian Style

Haegyeom Kim; Yuji Ishado; YaoSen Tian; Gerbrand Ceder. 2019. "Investigation of Alkali‐Ion (Li, Na, and K) Intercalation in K x VPO 4 F ( x ∼ 0) Cathode." Advanced Functional Materials 29, no. 34: 1.

Journal article
Published: 05 February 2019 in Nature Communications
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Structure plays a vital role in determining materials properties. In lithium ion cathode materials, the crystal structure defines the dimensionality and connectivity of interstitial sites, thus determining lithium ion diffusion kinetics. In most conventional cathode materials that are well-ordered, the average structure as seen in diffraction dictates the lithium ion diffusion pathways. Here, we show that this is not the case in a class of recently discovered high-capacity lithium-excess rocksalts. An average structure picture is no longer satisfactory to understand the performance of such disordered materials. Cation short-range order, hidden in diffraction, is not only ubiquitous in these long-range disordered materials, but fully controls the local and macroscopic environments for lithium ion transport. Our discovery identifies a crucial property that has previously been overlooked and provides guidelines for designing and engineering cation-disordered cathode materials. The average crystal structure largely governs the Li diffusion kinetics in well-ordered cathode materials. Here the authors show this rule does not hold true for cation-disordered analogues. Cation short-range order is not only ubiquitous but also controls the Li transport behavior.

ACS Style

Huiwen Ji; Alexander Urban; Daniil A. Kitchaev; Deok-Hwang Kwon; Nongnuch Artrith; Colin Ophus; Wenxuan Huang; Zijian Cai; Tan Shi; Jae Chul Kim; Haegyeom Kim; Gerbrand Ceder. Hidden structural and chemical order controls lithium transport in cation-disordered oxides for rechargeable batteries. Nature Communications 2019, 10, 1 -9.

AMA Style

Huiwen Ji, Alexander Urban, Daniil A. Kitchaev, Deok-Hwang Kwon, Nongnuch Artrith, Colin Ophus, Wenxuan Huang, Zijian Cai, Tan Shi, Jae Chul Kim, Haegyeom Kim, Gerbrand Ceder. Hidden structural and chemical order controls lithium transport in cation-disordered oxides for rechargeable batteries. Nature Communications. 2019; 10 (1):1-9.

Chicago/Turabian Style

Huiwen Ji; Alexander Urban; Daniil A. Kitchaev; Deok-Hwang Kwon; Nongnuch Artrith; Colin Ophus; Wenxuan Huang; Zijian Cai; Tan Shi; Jae Chul Kim; Haegyeom Kim; Gerbrand Ceder. 2019. "Hidden structural and chemical order controls lithium transport in cation-disordered oxides for rechargeable batteries." Nature Communications 10, no. 1: 1-9.

Journal article
Published: 14 December 2018 in The Electrochemical Society Interface
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A summary report by the recipient of the 2018 Colin Garfield Fink Postdoctoral Summer Fellowship.

ACS Style

Haegyeom Kim. The 2018 Colin Garfield Fink Postdoctoral Summer Fellowship – Summary Report: Investigation of Alkali Ion (Li, Na, and K) Intercalation in KxVPO4F Host Material. The Electrochemical Society Interface 2018, 27, 78 -79.

AMA Style

Haegyeom Kim. The 2018 Colin Garfield Fink Postdoctoral Summer Fellowship – Summary Report: Investigation of Alkali Ion (Li, Na, and K) Intercalation in KxVPO4F Host Material. The Electrochemical Society Interface. 2018; 27 (4):78-79.

Chicago/Turabian Style

Haegyeom Kim. 2018. "The 2018 Colin Garfield Fink Postdoctoral Summer Fellowship – Summary Report: Investigation of Alkali Ion (Li, Na, and K) Intercalation in KxVPO4F Host Material." The Electrochemical Society Interface 27, no. 4: 78-79.

Review
Published: 05 September 2018 in Small Methods
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Lithium‐ion batteries (LIBs) have dominated the energy storage market for more than two decades; however, the quest for lower‐cost battery alternatives is rapidly expanding, especially for large‐scale applications. Sodium‐ion batteries (SIBs) have recently experienced an impressive resurgence owing to the earth's abundance of sodium resources and the similar electrochemistry of SIBs and the well‐established LIBs. Nonetheless, whereas cost‐effective and reliable graphite anodes have served as a cornerstone in current LIB technology, one of the major limitations of SIBs has been the inability to exploit graphite as an electrode because of its negligible sodium storage capability. Recently, however, clear progress has been made in preparing high‐performance graphitic carbon anodes for SIBs with new findings on the mechanisms of sodium storage. Herein, this paper aims to review the progress made in understanding the sodium storage mechanisms in graphitic carbon materials and comprehensively summarize the start‐of‐the‐art achievements by surveying the correlations among the type of graphitic material, microstructure, sodium storage mechanisms, and electrochemical performance in SIBs. In addition, perspectives related to practical applications, including the electrolyte, coulombic efficiency, and applicability in sodium‐ion full cells, are also presented.

ACS Style

Zheng-Long Xu; Jooha Park; Gabin Yoon; Haegyeom Kim; Kisuk Kang. Graphitic Carbon Materials for Advanced Sodium‐Ion Batteries. Small Methods 2018, 3, 1 .

AMA Style

Zheng-Long Xu, Jooha Park, Gabin Yoon, Haegyeom Kim, Kisuk Kang. Graphitic Carbon Materials for Advanced Sodium‐Ion Batteries. Small Methods. 2018; 3 (4):1.

Chicago/Turabian Style

Zheng-Long Xu; Jooha Park; Gabin Yoon; Haegyeom Kim; Kisuk Kang. 2018. "Graphitic Carbon Materials for Advanced Sodium‐Ion Batteries." Small Methods 3, no. 4: 1.

Research article
Published: 29 August 2018 in Chemistry of Materials
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K-ion batteries are promising alternative energy storage systems for large-scale applications because of the globally abundant K reserves. K-ion batteries benefit from the lower standard redox potential of K/K+ than that of Na/Na+ and even Li/Li+, which can translate into a higher working voltage. Stable KC8 can also be formed via K intercalation into a graphite anode, which contrasts with the thermodynamically unfavorable Na intercalation into graphite, making graphite a readily available anode for K-ion battery technology. However, to construct practical rocking-chair K-ion batteries, an appropriate cathode material that can accommodate reversible K release and storage is still needed. We show that stoichiometric KCrO2 with a layered O3-type structure can function as a cathode for K-ion batteries and demonstrate a practical rocking-chair K-ion battery. In situ X-ray diffraction and electrochemical titration demonstrate that KxCrO2 is stable for a wide K content, allowing for topotactic K extraction and reinsertion. We further explain why stoichiometric KCrO2 is unique in forming the layered structure unlike other stoichiometric K-transition metal oxide compounds, which form nonlayered structures; this fundamental understanding provides insight for the future design of other layered cathodes for K-ion batteries.

ACS Style

Haegyeom Kim; Dong-Hwa Seo; Alexander Urban; Jinhyuk Lee; Deok-Hwang Kwon; Shou-Hang Bo; Tan Shi; Joseph K. Papp; Bryan D. McCloskey; Gerbrand Ceder. Stoichiometric Layered Potassium Transition Metal Oxide for Rechargeable Potassium Batteries. Chemistry of Materials 2018, 30, 6532 -6539.

AMA Style

Haegyeom Kim, Dong-Hwa Seo, Alexander Urban, Jinhyuk Lee, Deok-Hwang Kwon, Shou-Hang Bo, Tan Shi, Joseph K. Papp, Bryan D. McCloskey, Gerbrand Ceder. Stoichiometric Layered Potassium Transition Metal Oxide for Rechargeable Potassium Batteries. Chemistry of Materials. 2018; 30 (18):6532-6539.

Chicago/Turabian Style

Haegyeom Kim; Dong-Hwa Seo; Alexander Urban; Jinhyuk Lee; Deok-Hwang Kwon; Shou-Hang Bo; Tan Shi; Joseph K. Papp; Bryan D. McCloskey; Gerbrand Ceder. 2018. "Stoichiometric Layered Potassium Transition Metal Oxide for Rechargeable Potassium Batteries." Chemistry of Materials 30, no. 18: 6532-6539.