錯体水素化物固体電解質と硫化物ガラス固体電解質のハイブリッド利用による室温動作可能な 4 V 級バルク型全固体リチウム二次電池の開発

We have operated a 4 V-class bulk-type, all-solid-state LiCoO2/Li battery at room temperature. The composition consisted of a Li4(BH4)3I complex hydride electrolyte for the electrolyte layer, and a 80Li2S 20P2S5 sulfide glass for an electrolyte in the positive electrode layer. The battery assembled exhibited a 92 mAh•g−1 initial discharge capacity at 298 K and 0.1 C. The discharge capacity for the 20th cycle remained as high as 83 mAh•g−1, corresponding to a capacity retention ratio of nearly 90%.