LiPO2F2 electrolyte additive for high-performance Li-rich cathode material

• 作者: Bing Jiang Jingru Li Bi Luo Qizhang Yan Hao Li Lehao Liu Lihua Chu Yingfeng Li Qiaobao Zhang Meicheng Li
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 564-571
• 页数: 8页
• 语种: 英文

摘要

Li-rich layered oxide cathodes have received considerable attention because of the high operating poten-tial and specific capacity.However,the structural instability and parasitic reactions at high potential cause severe degradation of the electrochemical performance.In our studies,the cycling stability of Li1.14Ni0.133Co0.133Mn0.544O2 cathode is improved with LiPO2F2 electrolyte additive.After 500 cycles,the capacity retention is increased from 53.6％to 85％at 3C by LiPO2F2 modification.This performance is mainly attributed to the enhanced interfacial stability of the Li-rich cathode.Based on systematic char-acterization,LiPO2F2 additive was found to promote a stable interface film on the cathode surface during the cycling and mitigates the interfacial side reactions.This study provides new insights for improving high-potential Li-rich layered oxide batteries.