Insight into cathode surface to boost the performance of solid-state batteries

被引：77

作者：

Deng, Sixu ^{[1
]}

Sun, Qian ^{[1
]}

Li, Minsi ^{[1
]}

Adair, Keegan ^{[1
]}

Yu, Chuang ^{[1
]}

Li, Junjie ^{[1
]}

Li, Weihan ^{[1
]}

Fu, Jiamin ^{[1
]}

Li, Xia ^{[1
]}

Li, Ruying ^{[1
]}

Hu, Yongfeng ^{[2
]}

Chen, Ning ^{[2
]}

Huang, Huan ^{[4
]}

Zhang, Li ^{[3
]}

Zhao, Shangqian ^{[3
]}

Lu, Shigang ^{[3
]}

Sun, Xueliang ^{[1
]}

机构：

[1] Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada

[2] Canadian Light Source, 44 Innovat Blvd, Saskatoon, SK S7N 2V3, Canada

[3] China Automot Battery Res Inst Co Ltd, Fifth Floor,43,Min Bldg,North Sanhuan Middle Rd, Beijing 100088, Peoples R China

[4] Glabat Solid State Battery Inc, 700 Collip Circle, London, ON N6G 4X8, Canada

来源：

ENERGY STORAGE MATERIALS | 2021年 / 35卷

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

Ni-rich NMC; Sulfide electrolyte; Cathode interface; Degradation mechanism; ELECTROCHEMICAL PERFORMANCE; EDGE XANES; EVOLUTION; STORAGE; SULFUR;

D O I：

10.1016/j.ensm.2020.12.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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.

引用

页码：661 / 668

页数：8

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