Zr-doping stabilizes spinel LiMn2O4 as a low cost long cycle life cathode for lithium ion batteries

The present commercial spinel LiMn2O4 delivers only 90 mAh/g-115 mAh/g,far lower than the theoretical specific capacity.It degrades fast caused by the Jahn-Teller effect,Mn dissolution and related side reactions that consume Li inventory.In this work,Zr doping is employed to improve the structural s...

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Bibliographic Details
Published in:Chinese physics B 2023-05, Vol.32 (5), p.622-627
Main Authors: Zhang, Xiang-Gong, Wu, Wei, Zhou, Si-Si, Huang, Fei, Xu, Shi-Hao, Yin, Liang, Yang, Wei, Li, Hong
Format: Article
Language:English
Subjects:
cathode
cycle life
LiMn
lithium battery
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Summary:The present commercial spinel LiMn2O4 delivers only 90 mAh/g-115 mAh/g,far lower than the theoretical specific capacity.It degrades fast caused by the Jahn-Teller effect,Mn dissolution and related side reactions that consume Li inventory.In this work,Zr doping is employed to improve the structural stability and electrochemical performance of spinel LiMn2O4.Li1.06Mn1.94-xZrxO4(x=0,0.01,0.02,0.04)have been successfully synthesized by a simple solid-state reaction method and evaluated as cathode for lithium ion batteries(LIB).Li1.06Mn1.92Zr0.02O4 is superior cathode material with a high capacity of 122 mAh/g at 1-C rate;long cycle stability,98.39％retention after 100 cycles at 1-C rate,excellent high rate performance 107.1 mAh/g at 10-C rate,and high temperature performance 97.39％retention after 60 cycles.These are thought to be related to Zr doping effectively stabilizing the spinel LiMn2O4,by forming stronger Zr-O bonds in the octahedron,suppressing the Jahn-Teller effect,thus improving electrochemical performance.
ISSN:1674-1056
DOI:10.1088/1674-1056/acb919