Stable battery operation of a bulk-type all-solid-state lithium-sulfur battery was demonstrated by using a LiBH4 electrolyte. The electrochemical activity of insulating elemental sulfur as the positive electrode was enhanced by the mutual dispersion of elemental sulfur and carbon in the composite powders. Subsequently, a tight interface between the sulfur-carbon composite and the LiBH4 powders was manifested only by cold-pressing owing to the highly deformable nature of the LiBH4 electrolyte. The high reducing ability of LiBH4 allows using the use of a Li negative electrode that enhances the energy density. The results demonstrate the interface modification of insulating sulfur and the architecture of an all-solid-state Li-S battery configuration with high energy density.

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We have operated a 4V-class bulk-type, all-solid-state LiCoO 2 /Li battery at room temperature. The battery consisted of a Li 4 (BH 4 ) 3 I complex hydride electrolyte as the electrolyte layer, and a 80Li 2 S 20P 2 S 5 sul de glass as an electrolyte in the positive electrode layer. The assembled battery exhibited a 92 mAh g −1 initial discharge capacity at 298 K and 0.1 C. The discharge capacity for the 20 th cycle remained as high as 83 mAh g −1 , corresponding to a capacity retention ratio of nearly 90%.

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We have operated a 4 V class bulk type, all solid state LiCoO 2 /Li battery at room temperature. The composition consisted of a Li 4 (BH 4 ) 3 I complex hydride electrolyte for the electrolyte layer, and a 80Li 2 S 20P 2 S 5 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 20 th cycle remained as high as 83 mAh･g -1 , corresponding to a capacity retention ratio of nearly 90.