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Compatibility of Halide Electrolytes in Solid-State Li–S Battery Cathodes

相容性(地球化学) 卤化物 阴极 电解质 固态 材料科学 无机化学 化学工程 化学 物理化学 电极 复合材料 工程类
作者
Sachiko Yanagihara,Jan Huebner,Zheng Huang,Atsushi Inoishi,Hirofumi Akamatsu,Katsuro Hayashi,Saneyuki Ohno
出处
期刊:Chemistry of Materials [American Chemical Society]
标识
DOI:10.1021/acs.chemmater.4c02159
摘要

The utilization of earth-abundant and high-capacity sulfur in solid-state batteries presents a promising strategy to circumvent the use of rare transition metals and enhance achievable specific energy. However, numerous challenges remain. The transport limitation within the cathode composite, particularly with sulfide electrolytes during charging, has been identified as a major degradation mechanism in solid-state Li–S batteries. This degradation is linked to electrolyte oxidation and a concomitant reduction in the effective ionic conductivity of the cathode composite. Inspired by the sufficiently high oxidation stability of halide-based electrolytes, we investigated their compatibility with solid-state Li–S batteries in this work. The electrochemical stability of halides in contact with conductive additives, the stability window of fast ion transport in the composite electrodes, and chemical compatibility with sulfur-active materials (e.g., S and Li2S), in addition to the cyclability of the halide-based composite electrodes, are explored. Three halides were employed as model electrolytes: Li3InCl6, Li3YCl6, and Li3YBr6. Despite its high oxidation stability, Li3InCl6 exhibited rapid degradation due to electrolyte reduction. The composite with Li3YCl6 lost its capacity because of chemical incompatibility, especially with Li2S, resulting in the formation of LiYS2 at the interface. In contrast, Li3YBr6 demonstrated superior performance, maintaining a capacity of 1100 mAh gS–1 for 20 cycles (normalized to the sulfur content in the cathode material). This study elucidates the degradation mechanisms of halide-based solid-state Li–S batteries and proposes potential design strategies to mitigate chemical incompatibility issues.
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