Sulfide-based solid electrolyte and all-solid lithium ion battery
Provided are sulfide-based solid electrolyte with good ionic conductivity and an all-solid lithium ion battery using the same. A sulfide-based solid electrolyte having an argyrodite-type structure, wherein a composition of the sulfide-based solid electrolyte is represented by the formula: Li 8 GeS 5-x Te 1+x in which: −0.5≤x<0, 0<x≤0.375.
1. A sulfide-based solid electrolyte having an argyrodite-type structure, wherein a composition of the sulfide-based solid electrolyte is represented by the formula:
Li 8 GeS 5-x Te 1+x
in which: −0.5≤x<0, 0<x≤0.375.
2. The sulfide-based solid electrolyte according claim 1 , wherein the sulfide-based solid electrolyte satisfies −0.375≤x<0 in the formula.
3. An all-solid lithium ion battery comprising: a solid electrolyte layer made of the sulfide-based solid electrolyte according to claim 1 ; a positive electrode layer; and a negative electrode layer.
4. An all-solid lithium ion battery comprising: a solid electrolyte layer made of the sulfide-based solid electrolyte according to claim 2 ; a positive electrode layer; and a negative electrode layer.