Atsushi Unemoto1, Genki Nogami2, Masaru Tazawa2, Mitsugu Taniguchi2 and Shin-ichi Orimo1,3
1WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577
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%.
complex hydride electrolyte, sulfide electrolyte, bulk-type, all-solid-state battery, room temperature operation
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