Interface evolution and performance degradation in LiCoO2 composite battery electrodes monitored by advanced EQCM

Wanli Gao,Christel Laberty-Robert,Natacha Krins,Catherine Debiemme-Chouvy,Hubert Perrot,Ozlem Sel

Electrochimica Acta（2022）

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摘要

•Capacity fading of composite electrodes over cycling in Aqu-LIBs is investigated.•Water-assisted Li+ intercalation persists during cycling.•No mechanical degradation of LiCoO2 composite electrode is observed.•Surficial evolution from LiCoO2 to CoO results in the capacity fading.•Structural evolution of interface significantly slows down Li+ insertion kinetics.

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关键词

Aqueous Li-ion batteries,Lithium cobalt oxide,Degradation mechanism,Interfacial ion transfer,EQCM

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