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Quantifying Degrada...
Quantifying Degradation Parameters of Single-Crystalline Ni-Rich Cathodes in Lithium-Ion Batteries
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- Zhao, Wengao (author)
- Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa),Swiss Federal Laboratories for Materials Science and Technology (Empa),Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Wang, Kuan (author)
- Beijing University of Technology
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- Fan, Xinming (author)
- Central South University
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- Ren, Fucheng (author)
- Xiamen University
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- Xu, Xieyu (author)
- Xi'an Jiaotong University
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- Liu, Yangyang (author)
- Xi'an Jiaotong University
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- Xiong, Shizhao, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Liu, Xiangsi (author)
- Xiamen University
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- Zhang, Zhengfeng (author)
- Beijing University of Technology
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- Si, Mayan (author)
- Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa),Swiss Federal Laboratories for Materials Science and Technology (Empa)
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- Zhang, Ruizhuo (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- van den Bergh, Wessel (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Yan, Pengfei (author)
- Beijing University of Technology
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- Battaglia, Corsin (author)
- Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa),Swiss Federal Laboratories for Materials Science and Technology (Empa)
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- Brezesinski, Torsten (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Yang, Yong (author)
- Xiamen University
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Angewandte Chemie - International Edition. - 1433-7851 .- 1521-3773. ; 62:32
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https://doi.org/10.1...
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Abstract
Subject headings
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- Single-crystal LiNixCoyMnzO2 (SC-NCM, x+y+z=1) cathodes are renowned for their high structural stability and reduced accumulation of adverse side products during long-term cycling. While advances have been made using SC-NCM cathode materials, careful studies of cathode degradation mechanisms are scarce. Herein, we employed quasi single-crystalline LiNi0.65Co0.15Mn0.20O2 (SC-NCM65) to test the relationship between cycling performance and material degradation for different charge cutoff potentials. The Li/SC-NCM65 cells showed >77 % capacity retention below 4.6 V vs. Li+/Li after 400 cycles and revealed a significant decay to 56 % for 4.7 V cutoff. We demonstrate that the SC-NCM65 degradation is due to accumulation of rock-salt (NiO) species at the particle surface rather than intragranular cracking or side reactions with the electrolyte. The NiO-type layer formation is also responsible for the strongly increased impedance and transition-metal dissolution. Notably, the capacity loss is found to have a linear relationship with the thickness of the rock-salt surface layer. Density functional theory and COMSOL Multiphysics modeling analysis further indicate that the charge-transfer kinetics is decisive, as the lower lithium diffusivity of the NiO phase hinders charge transport from the surface to the bulk.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- Single-Crystal Cathodes
- Transfer Kinetics
- Structural Stability
- Rock-Salt Formation
- Multiphysics Analysis
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Zhao, Wengao
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Wang, Kuan
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Fan, Xinming
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Ren, Fucheng
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Xu, Xieyu
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Liu, Yangyang
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show more...
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Xiong, Shizhao, ...
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Liu, Xiangsi
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Zhang, Zhengfeng
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Si, Mayan
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Zhang, Ruizhuo
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van den Bergh, W ...
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Yan, Pengfei
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Battaglia, Corsi ...
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Brezesinski, Tor ...
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Yang, Yong
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
- Articles in the publication
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Angewandte Chemi ...
- By the university
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Chalmers University of Technology