マルチテクニックXPS装置による全固体電池材料の界面解析

抄録

All-solid-state batteries (ASSBs) have been attracting attention as the next generation batteries, but they face challenges, including internal resistance at the solid electrolyte/electrode interface. This study examines a LiPON/LiCoO₂ interface using multi-technique X-ray photoelectron spectroscopy (XPS) to analyze chemical states and energy band diagrams. Results show that interlayer formation and structural changes during manufacturing stimulate Co reduction in the LiCoO₂ layer near the interface, leading to an increase in interfacial impedance. To minimize internal resistance, preventing Co reduction is necessary. The study offers insights into the chemical interactions between LiPON and LiCoO₂ layers, which may help address challenges in ASSBs commercialization.