Sulfide solid electrolyte material, battery, and producing method for sulfide solid electrolyte material

A sulfide solid electrolyte material comprising:

• a Li element, a K element, a Si element, a P element and a S element;
• having a peak at a position of 2θ=29.58°±0.50° in X-ray diffraction measurement using a CuKα ray;
• not having a peak at a position of 2θ=27.33°±0.50° in X-ray diffraction measurement using a CuKα ray, or
• when a diffraction intensity at the peak of 2θ=29.58°±0.50° is regarded as IA and a diffraction intensity at the peak of 2θ=27.33°±0.50° is regarded as IB in a case of having the peak at the position of 2θ=27.33°+0.50°, a value of IB/IA being less than 1;
• a molar fraction (P/(Si+P)) of the P element to a total of the Si element and the P element satisfying 0.5≦P/(Si+P)≦0.7;
• and
• a molar fraction (K/(Li+K)) of the K element to a total of the Li element and the K element satisfying 0.05≦K/(Li+K)≦0.1.

A sulfide solid electrolyte material comprising:

• an octahedron O comprising a Li element and a S element, a tetrahedron T1 comprising an Ma element and a S element, and a tetrahedron T2 comprising an Mb element and a S element, the tetrahedron T1 and the octahedron O sharing an edge, and the tetrahedron T2 and the octahedron O containing a crystal structure sharing a corner as a main body,
• each of the Ma element and the Mb element containing at least one of a Si element and a P element;
• at least one of the octahedrons O is such that part of the Li element bonding to the S element being substituted with a K element;
• a molar fraction (P/(Si+P)) of the P element to a total of the Si element and the P element satisfying 0.5≦P/(Si+P)≦0.7;
• and
• a molar fraction (K/(Li+K)) of the K element to a total of the Li element and the K element satisfying 0.05≦K/(Li+K)≦0.1.