Idemitsu Kosan Company, Limited

Akiko Nakata

Futoshi Utsuno

Masaru Nakagawa

Kota Terai

Junpei Maruyama

Provided is a sulfide solid electrolyte containing lithium, phosphorus, sulfur and chlorine, in which a molar ratio of the chlorine to the phosphorus, c (Cl/P), is greater than 1.0 and 1.9 or less, the sulfide solid electrolyte includes an argyrodite-type crystal structure, and a lattice constant of the argyrodite-type crystal structure is 9.820 Å or less.

Sulfide solid electrolyte

Provided is a sulfide solid electrolyte containing lithium, phosphorus, sulfur and chlorine, in which a molar ratio of the chlorine to the phosphorus, c (Cl/P), is greater than 1.0 and 1.9 or less, the sulfide solid electrolyte includes an argyrodite-type crystal structure, and a lattice constant of the argyrodite-type crystal structure is 9.820 &#x212b; or less.

A method for producing sulfide glass wherein phosphorus sulfide satisfying the following formula (1) is used as a raw material:100&#xd7;&#x2265;37&#x2003;&#x2003;(1)wherein in the formula, A is peak areas of peaks that appear at peak positions in a range of 57.2 ppm or more and 58.3 ppm or less, and 63.0 ppm or more and 64.5 ppm or less inPNMR spectroscopy, and B is the total of peak areas of all peaks measured inPNMR spectroscopy.

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Sodegaura, Japan

Akiko Nakata