| abstract |
(57) [Summary] [Object] The present invention aims to obtain a solid electrolyte having higher lithium ion conductivity by vitrifying while increasing the concentration of mobile ions in order to increase the ion conductivity of the solid electrolyte. To do. The present invention is based on the general formula aLi 3 PO 4 .bLi 2 S · cX (a + b + c = 1, X is SiS 2 , GeS 2 , In the amorphous lithium ion conductive solid electrolyte represented by at least one sulfide of P 2 S 5 and B 2 S 3 , a <0.3 and b> 0.3 and c> 0.2 Use a composition within the range. |