材料科学
X射线吸收光谱法
阴极
涂层
硫化物
吸收光谱法
电解质
分析化学(期刊)
透射电子显微镜
光谱学
X射线光电子能谱
化学工程
纳米技术
光学
物理化学
冶金
电极
化学
物理
工程类
量子力学
色谱法
作者
Yonezo Morino,Satoshi Kanada
标识
DOI:10.1021/acsami.2c19414
摘要
The surface coating of cathode active material in all-solid-state batteries using sulfide-based solid electrolytes is well-known to be a fundamental technology, and LiNbO3 is one of the most representative materials. The half cells using the cathode mixture of Li6PS5Cl/LiNbO3-coated LiNi0.5Co0.2Mn0.3O2 were exposed in harsh conditions at 60 °C and 4.25-4.55 V vs Li/Li+ and analyzed by transmission electron microscope/energy dispersive X-ray spectroscopy (TEM/EDS) and X-ray absorption spectroscopy (XAS). TEM/EDS observation shows that Nb element derived from LiNbO3 coating had remained at the interface, which means that Nb element had not migrated to the solid electrolyte and active material. On the other hand, the XAS spectra of Nb L3-edge changed corresponding to cell performance degradation. From the comparison with the spectra of the reference materials of the Li-Nb-O system, the XAS spectral changes were assigned to the decomposition reaction which released Li and O from the LiNbO3 coating. The side reaction is presumed to cause to the oxidization deterioration of sulfide electrolyte at the interface of Li6PS5Cl/LiNbO3-coated LiNi0.5Co0.2Mn0.3O2.
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