All-solid-state lithium secondary battery

Abstract

A safe and highly-reliable all-solid-state lithium secondary battery using a sulfide-based solid electrolyte material which can restrain generation of hydrogen sulfide gas, in case a large amount of water is entered into a battery case by an accident such as submersion associated with a breakage of the container. An all-solid-state lithium secondary battery using a sulfide-based solid electrolyte material, wherein the battery has a metal salt M-X comprising a metal element “M” and an anionic part “X” in a battery case thereof, and further wherein a metal cation of the metal salt M-X generated by disassociation caused with water can react with a sulfide ion generated by a reaction between the sulfide-based solid electrolyte material and the water.

1 . An all-solid-state lithium secondary battery using a sulfide-based solid electrolyte material,
 wherein the battery has a metal salt M-X comprising a metal element “M” and an anionic part “X” in a battery case thereof, and further   wherein a metal cation of the metal salt M-X generated by disassociation caused with water can react with a sulfide ion generated by a reaction between the sulfide-based solid electrolyte material and the water.   
     
     
         2 . The all-solid-state lithium secondary battery according to  claim 1 , wherein the metal element “M” of the metal salt M-X is at least one selected from the group consisting of Cd, Sn, Pb, Cu, Hg, Ag, Al, Mn, Zn, Fe and Ni, and further
 wherein the anionic part “X” of the metal salt M-X is at least one selected from the group consisting of OH, SO 4  and NO 3 .