电解质
电极
化学
化学工程
接口(物质)
无机化学
材料科学
吸附
物理化学
吉布斯等温线
工程类
作者
Yuxiang Xie,Wei Li,Huan Hu,Chenguang Shi,Yuhao Hong,Peng Dai,Zhien Lin,Ying Sha,Junfeng Wang,Linghai Xie,Kai Wu,Ling Huang,Shi‐Gang Sun
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2024-04-18
标识
DOI:10.1021/acssuschemeng.3c07959
摘要
NMC532 (LiNi0.5Mn0.3Co0.2O2) is a cost-effective and structurally stable cathode material that is widely used in batteries. Despite its stability, it undergoes irreversible phase transitions and transition metal (TM) dissolution during long-term cycling, which significantly impacts cell performance. This study pioneered a methodology to investigate the solid electrolyte interface (SEI) layers in depth, employing advanced analytical techniques: time-of-flight secondary ion mass spectrometry (TOF-SIMS) and cluster analysis. By utilizing these techniques, we specifically examined the impact of Mn dissolution on the interface evolution of graphite during calendar degradations. Additionally, we explored the relationship between Mn dissolution and cell performance in a graphite||NMC532 pouch cell. The results demonstrate that the competition between Mn dissolution and electrolyte depletion governs cell degradation. In particular, Mn dissolution accelerates the decomposition of the electrolyte, ultimately causing SEI layer growth. These findings provide a deeper understanding of battery performance and degradation mechanisms.
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