In Situ Visualized Cathode Electrolyte Interphase on LiCoO2 in High Voltage Cycling

ACS Applied Materials & Interfaces
Wei LuLiwei Chen

Abstract

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 cathode-electrolyte 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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Citations

Apr 13, 2018·Physical Chemistry Chemical Physics : PCCP·Xiao-Feng ZhangYue Yan
Jun 30, 2018·Chemical Society Reviews·Longlong WangLiquan Chen
Aug 23, 2018·Advanced Materials·Xi ChenLiwei Chen
Jun 17, 2020·Chemistry, an Asian Journal·Xiao-Tong WangXing-Long Wu
Aug 4, 2021·Chemical Society Reviews·Xiulin Fan, Chunsheng Wang
May 30, 2019·The Journal of Physical Chemistry Letters·Jonathan H RabergTanja Cuk
Jun 29, 2018·Chemical Reviews·Jia DingDavid Mitlin
Jul 23, 2020·Inorganic Chemistry·Kazuhiko MukaiTakamasa Nonaka
Nov 15, 2018·Analytical Chemistry·Jingshu HuiJoaquín Rodríguez-López
Sep 9, 2021·Chemical Communications : Chem Comm·Maoyu Wang, Zhenxing Feng

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