Unraveling the evolution of Cathode–Solid electrolyte interface using operando X-ray Photoelectron spectroscopy

• DOI: 10.1016/j.apmate.2024.100184
• Publication Date: 2024-02-24T03:48:23Z
• Authors: Wenhao Zhong; Jianming Tao; Yue Chen; Richard G. White; Long Zhang; Jiaxin Li; Zhigao Huang; Yingbin Lin
• Keywords: Interface (matter)

Understanding the evolution of solid electrolyte-electrode interface is currently one most challenging obstacles in development solid-state batteries (SSBs). Here, we develop an X-ray Photoelectron Spectroscopy (XPS) that allows for operando measurement during cycling. Based on theoretical analysis and modulated electrode detector co-grounding mode, displacement binding energy can be correlated with surface electrostatic potential material, revealing charge distribution composition space layer between cathode electrolyte. In investigation typical LiCoO2 (LCO)/Li6PS5Cl (LPSC)/Li–In batteries, observed static difference oxidative decomposition LPSC LCO, effectiveness LiNbO3 coating reducing inhibiting diffusion Co oxidation S species. Furthermore, our study also revealed drop LiNi0·8Co0·1Mn0·1O2 smaller than whilst Li3InCl6 LCO remains near zero. The proposed XPS method offers a novel approach real-time monitoring species formation, providing rational guidance engineering SSBs.