Li2S‐Based Solid Solutions as Positive Electrodes with Full Utilization and Superlong Cycle Life in All‐Solid‐State Li/S Batteries
作者： Takashi Hakari , Akitoshi Hayashi , Masahiro Tatsumisago
关键词:
摘要: All-solid-state Li/S batteries have received a lot of attention in the view point high safety and long cycle life. However, all-solid-state cells suffered from low utilization Li2S. In this study, for improving understanding conversion reaction Li2S/S cells, Li2S-based solid solutions composed Li2S one lithium halides LiCl, LiBr, LiI are applied as active materials to cells. Capacity with 80Li2S·20LiI (mol%) reaches more than 1100 mAh g−1 at 0.5 C, corresponding 95% theoretical capacity. The reversible full is first demonstrated work. significantly improved originated by increase electrochemical sites rather ionic conductivities solutions. Furthermore, cell retains capacity 980 2 C 2000 cycles without degradation. These best cycling performances reported not only electrolytes but also organic liquid electrolytes.
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