日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 80, No. 12 (2016),
pp. 720-725

Development of 4 V-Class Bulk-Type All-Solid-State Lithium Rechargeable Batteries by a Combined Use of Complex Hydride and Sulfide Electrolytes for Room Temperature Operation

Atsushi Unemoto1, Genki Nogami2, Masaru Tazawa2, Mitsugu Taniguchi2 and Shin-ichi Orimo1,3

1WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577
2Mitsubishi Gas Chemicals Co., Ltd., Niigata 950-3112
3Institute for Materials Research, Tohoku University, Sendai 980-8577

Abstract:

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%.

[doi:10.2320/jinstmet.JD201601]


(Received 2016/3/2)

Keywords:

complex hydride electrolyte, sulfide electrolyte, bulk-type, all-solid-state battery, room temperature operation


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