Electrochemical Analyses of the Li-Ion Transfer Resistances at the Chloride Solid Electrolyte | Sulfide Solid Electrolyte Interfaces

作者：Kotaro Yoshida, Atsunori Ikezawa, Takeyoshi Okajima, Shoma Yanagihara, Saneyuki Ohno, Hajime Arai · 发表于：ECS Meeting Abstracts · 年份：2024 · DOI：10.1149/ma2024-0281242mtgabs

Introduction The all-solid-state Li-ion battery is expected to be a next-generation battery owing to its enhanced safety and high rate-capability ascribed to sulfide solid electrolytes (SEs) having incombustibility and high ionic conductivity. However, low cyclability hinders their practical application. Since the oxidative decomposition of the sulfide SE in the positive electrode is known as one of the main degradation modes, bilayer SE cells are promising to suppress the degradation where the chloride SE having relatively high stability against oxidation is placed on the positive electrode side and the reduction-resistive sulfide SE is placed on the negative electrode side. [1]. While it is reported that the interface between the sulfide and chloride SEs is not chemically stable and interphases are formed between the SEs [1], the effect of the interphase on the Li-ion transport between the sulfide and chloride SEs has not been investigated. As a way to analyze the resistance between two SEs, we have recently established an all-solid-state electrochemical four-electrode cell using a partially reduced lithium titanate (R-LTO) reference electrode (RE) [2,3]. Experimental In this study, we apply the electrochemical four-electrode cell to the sulfide SE | chloride SE interfaces to analyze the Li-ion transport resistance. The glass-ceramic Li2S-P2S5-LiI (LPSI) was synthesized by the method reported by X. Feng et al. [4]. The chloride SEs, Li3InCl6 (LIC), Li3SrCl6 (LSC), ...