A sulfide solid electrolyte containing lithium, phosphorus, sulfur, and two or more of elements X selected from halogen elements, where the sulfide solid electrolyte includes an argyrodite-type crystal structure, and a molar ratio of the sulfur to the phosphorus “b (S/P)” and a molar ratio of the el
A sulfide solid electrolyte containing lithium, phosphorus, sulfur, and two or more of elements X selected from halogen elements, where the sulfide solid electrolyte includes an argyrodite-type crystal structure, and a molar ratio of the sulfur to the phosphorus “b (S/P)” and a molar ratio of the element X to the phosphorus “c (X/P)” satisfy the following formula (1): 0.23c/b0.57 (1a).
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1. A sulfide solid electrolyte, comprising lithium, phosphorus, sulfur, and two or more of elements X selected from the group consisting of halogen elements, wherein the sulfide solid electrolyte comprises an argyrodite-type crystal structure, andwherein a molar ratio of the sulfur to the phosphorus
1. A sulfide solid electrolyte, comprising lithium, phosphorus, sulfur, and two or more of elements X selected from the group consisting of halogen elements, wherein the sulfide solid electrolyte comprises an argyrodite-type crystal structure, andwherein a molar ratio of the sulfur to the phosphorus, b (S/P), and a molar ratio of the elements X to the phosphorus, c (X/P), satisfy formula (1): 0.230 and c>0 are satisfied. 9. The sulfide solid electrolyte according to claim 1, comprising a composition represented by formula (3): Lia(P1-αMα)SbXc (3)wherein:M is one or more of elements selected from the group consisting of Si, Ge, Sn, Pb, B, Al, Ga, As, Sb and Bi, and X is two or more of elements selected from the group consisting of F, Cl, Br and I;a to c satisfy formulas (A) to (C); anda satisfies 0≤α≤0.3: 5.0≤a≤7.5 (A)6.5≤a+c≤7.5 (B)0.5≤a−b≤1.5 (C)wherein b>0 and c>0 are satisfied. 10. The sulfide solid electrolyte according to claim 1, wherein: at least one of the elements X is chlorine; andat least one of the elements X is bromine. 11. The sulfide solid electrolyte according to claim 4, wherein the sulfide solid electrolyte satisfies formula (2): 0.250 and c>0 are satisfied. 13. The sulfide solid electrolyte according to claim 4, wherein the sulfide solid electrolyte satisfies formula (2): 0.250 and c>0 are satisfied. 14. The sulfide solid electrolyte according to claim 4, wherein the sulfide solid electrolyte satisfies formula (2): 0.250 and c>0 are satisfied. 15. The sulfide solid electrolyte according to claim 4, wherein the sulfide solid electrolyte satisfies formula (2): 0.250 and c>0 are satisfied 17. The sulfide solid electrolyte according to claim 4, wherein the sulfide solid electrolyte satisfies formula (2): 0.25
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