Building a Self‐Adaptive Protective Layer on Ni‐Rich Layered Cathodes to Enhance the Cycle Stability of Lithium‐Ion Batteries

Layered Ni‐rich lithium transition metal oxides are promising battery cathodes due to their high specific capacity, but their poor cycling stability due to intergranular cracks in secondary particles restricts their practical applications. Surface engineering is an effective strategy for improving a...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2022-09, Vol.34 (38), p.e2204835-n/a
Main Authors: Yang, Hua, Gao, Rui‐Min, Zhang, Xu‐Dong, Liang, Jia‐Yan, Meng, Xin‐Hai, Lu, Zhuo‐Ya, Cao, Fei‐Fei, Ye, Huan
Format: Article
Language:English
Subjects:
Addition polymerization
Cathodes
Cathodic protection
Cracks
Cycles
Dynamic stability
high stability
intergranular cracking
Lithium-ion batteries
Materials science
Polyacrylic acid
Polymers
protective layers
Ring structures
Surface stability
Transition metal oxides
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Summary:Layered Ni‐rich lithium transition metal oxides are promising battery cathodes due to their high specific capacity, but their poor cycling stability due to intergranular cracks in secondary particles restricts their practical applications. Surface engineering is an effective strategy for improving a cathode's cycling stability, but most reported surface coatings cannot adapt to the dynamic volume changes of cathodes. Herein, a self‐adaptive polymer (polyrotaxane‐co‐poly(acrylic acid)) interfacial layer is built on LiNi0.6Co0.2Mn0.2O2. The polymer layer with a slide‐ring structure exhibits high toughness and can withstand the stress caused by particle volume changes, which can prevent the cracking of particles. In addition, the slide‐ring polymer acts as a physicochemical barrier that suppresses surface side reactions and alleviates the dissolution of transition metallic ions, which ensures stable cycling performance. Thus, the as‐prepared cathode shows significantly improved long‐term cycling stability in situations in which cracks may easily occur, especially under high‐rate, high‐voltage, and high‐temperature conditions. A slide‐ring polymer featuring high elasticity and self‐adaptive ability is designed to improve the performance of lithium‐ion batteries via relieving the cracks of cathode particles and retarding parasitic interfacial side reactions during cycling.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202204835