Blending Layered Cathode with Olivine: An Economic Strategy for Enhancing the Structural and Thermal Stability of 4.65 V LiCoO2

The intrinsic poor structural and thermal stability of high‐voltage layered cathodes are aggravated as the charging depth increases, which severely threatens the cycle life and safety of the battery. Herein, without modifying the high‐voltage layered cathode itself, a simple and economic blending st...

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Bibliographic Details
Published in:Advanced functional materials 2023-10, Vol.33 (43)
Main Authors: Yan, Yawen, Zheng, Yichun, Zhang, Haitang, Chen, Jianken, Zeng, Guifan, Wang, Lingling, Zhang, Baodan, Zhou, Shiyuan, Tang, Yonglin, Fu, Ang, Zheng, Lirong, Huang, Huan, Zou, Yue, Chuan-Wei, Wang, Kuai, Xiaoxiao, Sun, Yang, Yu, Qiao, Shi‐Gang Sun
Format: Article
Language:English
Subjects:
Blending
Bonding strength
Cathodes
High temperature
High voltages
Lithium compounds
Materials science
Olivine
Product safety
Structural stability
Thermal stability
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Summary:The intrinsic poor structural and thermal stability of high‐voltage layered cathodes are aggravated as the charging depth increases, which severely threatens the cycle life and safety of the battery. Herein, without modifying the high‐voltage layered cathode itself, a simple and economic blending strategy is introduced, and an olivine‐LiCoO2 blended cathode featuring superior comprehensive performance (energy, power, cycle‐life, and safety) at 4.65 V is fabricated. The strong bonding affinity at the olivine/LiCoO2 contact interface suppresses lattice O2 release of LiCoO2, thus significantly improving the structural and thermal stability at high delithiation states. Meanwhile, by contacting with high‐electron‐conductivity LiCoO2, the redox activity of olivine is further activated. Therefore, a stable operation of both olivine‐LiCoO2 and olivine‐LiNi0.8Co0.1Mn0.1O2 blended cathode is achieved under harsh cycling conditions (high voltage or elevated temperature) and long‐life pouch‐cell (91.6% capacity retention after 1000 cycles) is harvested, demonstrating the feasibility and universality of this economic blending strategy on heterogenous cathode candidates.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202304496