阴极
材料科学
降级(电信)
电化学
锂(药物)
电解质
硫化物
化学工程
涂层
固态
纳米技术
电极
工程物理
冶金
电气工程
化学
物理化学
工程类
内分泌学
医学
作者
Sixu Deng,Qian Sun,Minsi Li,Keegan R. Adair,Chuang Yu,Junjie Li,Weihan Li,Jiamin Fu,Xia Li,Ruying Li,Yongfeng Hu,Ning Chen,Huan Huang,Li Zhang,Shangqian Zhao,Shigang Lu,Xueliang Sun
标识
DOI:10.1016/j.ensm.2020.12.003
摘要
Cathode interface instability is a significant obstacle for the practical application of sulfide-based all-solid-state lithium-ion batteries (ASSLIBs). However, the origin of cathode interface degradation is lack of comprehensive understanding. In this paper, X-ray characterizations combined with electrochemical analysis are adopted to investigate the underlying degradation mechanism at cathode interface. The results indicate that residual lithium compounds on the surface of Ni-rich LiNi0.8Mn0.1Co0.1O2 (NMC811) are the main reason that triggering the oxidation of sulfide solid-state electrolytes (SSEs), therefore inducing severe side-reactions at cathode interface and structural degradation of NMC811. The degradation of the cathode interface can be significantly suppressed when the cathode surface is cleaned. As a result, the surface cleaned NMC811 without coating demonstrates significantly improved electrochemical performance in both Li5.5PS4.5Cl1.5 (LPSCl) and Li10GeP2S12 (LGPS) based ASSLIBs, proving the universal application of this strategy.
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