期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 22, 页码 19313-19318出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b03024
关键词
lithium ion battery; lithium cobalt oxide (LiCoO2); solid-electrolyte interphase (SEI); cathode electrolyte interphase (CEI); in situ atomic force microscopy
资金
- Ministry of Science and Technology [2016YFA0200703]
- Strategic Priority Research Program of the CAS [XDA09010600]
- Natural Science Foundation of China [21625304, 21473242, 21273273, 21473241, 21503265]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- CAS
Charging lithium ion battery cathode materials such as LiCoO2 to a higher voltage may simultaneously enhance the specific capacity and average operating voltage and thus improve the energy density. However, battery cycle life is compromised in high voltage cycling due to lattice instability and undesired oxidation of electrolyte. Cathode solid-electrolyte interphase (SEI), or cathode-electrolyte interphase (CEI), in situ formed at the cathodeelectrolyte interface under high voltage, is critically important in understanding the cathode degradation process and crucial in improving high voltage cycle stability. Here we present in situ atomic force microscopy (AFM) investigation of CEI on LiCoO2 at high voltage. The formation of CEI is only observed at the LiCoO2 edge plane, not at the basal plane. The thin layer of Al2O3 coating completely suppresses the formation of CEI at the edge planes, and is shown to significantly improve coin cell high voltage cycle stability.
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