Aimed at providing a sulfide solid electrolyte comprising an argyrodite type crystal structure, having a high ionic conductivity due to presence of a large amount of a halogen element and is capable of suppressing agglomeration at the time of production. Provided is a sulfide solid electrolyte compr
Aimed at providing a sulfide solid electrolyte comprising an argyrodite type crystal structure, having a high ionic conductivity due to presence of a large amount of a halogen element and is capable of suppressing agglomeration at the time of production. Provided is a sulfide solid electrolyte comprising lithium, phosphorus, sulfur and one or more elements X selected from halogen elements, wherein the sulfide solid electrolyte comprises an argyrodite type crystal structure, and wherein a molar ratio of the lithium to the phosphorus “a (Li/P)”, 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 formulas (1) to (3): 5.05≦a7.3 (1) 0.705≦a−b1.0 (2) 7.0a+c≦7.3 (3) provided that b0 and c0.
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1: A sulfide solid electrolyte, comprising lithium,phosphorus,sulfur andone or more elements X selected from the group consisting of a halogen element,wherein the sulfide solid electrolyte comprises an argyrodite type crystal structure, andthe sulfide solid electrolyte satisfies formulae (1) to (3):
1: A sulfide solid electrolyte, comprising lithium,phosphorus,sulfur andone or more elements X selected from the group consisting of a halogen element,wherein the sulfide solid electrolyte comprises an argyrodite type crystal structure, andthe sulfide solid electrolyte satisfies formulae (1) to (3): 5.05≦a0 and c>0. 2: The sulfide solid electrolyte according to claim 1, that satisfies a composition represented by formula (4): Lia(P1−zMz)SbXc (4)wherein M is one or more elements selected from the group consisting of Si, Ge, Sn, Pb, B, Al, Ga, As, Sb and Bi,X is one or more elements selected from the group consisting of F, Cl, Br and I;a to c satisfy the formulae (1) to (3); andz satisfies 0≦z≦0.3. 3: The sulfide solid electrolyte according to claim 1, wherein the sulfide solid electrolyte has a diffraction peak at 2θ=25.2±0.5 deg and a diffraction peak 29.7±0.5 deg in powder X-ray diffraction using CuKα rays. 4: An electrode mix, comprising: the sulfide solid electrolyte according to claim 1 andan active material. 5: A lithium ion battery, comprising at least one of: the sulfide solid electrolyte according to claim 1, andan electrode mix comprising the sulfide solid electrolyte and an active material. 6: An electrode mix, comprising: the sulfide solid electrolyte according to claim 1. 7: A lithium ion battery, comprising: at least one of: the sulfide solid electrolyte according to claim 1,an electrode mix comprising the sulfide solid electrolyte and an active material andan electrode mix comprising the sulfide solid electrolyte.
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