4.8 Article

Revealing the surface-to-bulk degradation mechanism of nickel-rich cathode in sulfide all-solid-state batteries

期刊

ENERGY STORAGE MATERIALS
卷 54, 期 -, 页码 713-723

出版社

ELSEVIER
DOI: 10.1016/j.ensm.2022.11.019

关键词

Nickel -rich materials; Sulfide electrolyte; All -solid-state batteries; Operando X-ray diffraction; Structure evolution

向作者/读者索取更多资源

Layered nickel-rich materials have been considered promising cathode candidates for solid-state batteries, but they suffer from low Coulombic efficiency and poor cycle stability at high cutoff potentials. This study investigates the bulk structure evolution of LiNi0.8Co0.1Mn0.1O2 cathode material in solid-state batteries and reveals the crucial role of surface chemistry in the degradation mechanism and performance enhancement. The results demonstrate that surface coating not only suppresses interfacial side reactions but also eliminates sluggish phase, leading to improved performance.
Layered nickel-rich materials (LiNi1-y-zCoyMnzO2, 1-y-z >= 0.8) are regarded as promising cathode candidates for all-solid-state batteries (ASSBs); however, nickel-rich cathodes exhibit low Coulombic efficiency and poor cycle stability at high cutoff potentials (E >= 4.2 V vs. Li+/Li). To interpret this, much attention has been focused on the study of interface reactions, while ignoring the bulk structure evolution of active materials during cycling. Herein, we thoroughly investigate the bulk structure evolution of single-crystal LiNi0.8Co0.1Mn0.1O2 in ASSBs at different cycles, further correlated with its interface reactions and electrochemical performance. Operando X-ray diffraction detects the emergence of sluggish phase in ASSBs during the first charge process, which accumulates significantly as the cycle progresses, corresponding to the limited delithiation and rapid performance decay. Our results reveal that the surface chemistry has a great effect on the bulk structure evolution and such a surface-to -bulk degradation mechanism is critical to the cathode design toward high-performance ASSBs. From this novel perspective, we demonstrate that the enhanced performance employing the surface coating on the nickel-rich materials is attributed not only to the suppression of interfacial side reactions but also to the elimination of sluggish phase.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据