Sulfide solid electrolyte material

Abstract

The main object of the present invention is to provide a sulfide solid electrolyte material with less hydrogen sulfide generation amount. The present invention solves the above-mentioned problem by providing a sulfide solid electrolyte material using a raw material composition containing Li 2 S and sulfide of an element of the group 14 or the group 15 in the periodic table, containing substantially no cross-linking sulfur and Li 2 S.

1 . A sulfide solid electrolyte material comprising Li 4 SiS 4 ,
 wherein no Li 2 S peak is observed by X-ray diffraction,   the sulfide solid electrolyte material contains no cross-linking sulfur, and   in the case that 100 mg of the sulfide solid electrolyte material is pressed at a pressure of 5.1 ton/cm 2  by using a pelleting machine having a molding portion with an area of 1 cm 2  to form a pellet, and the pellet is disposed inside a hermetically sealed desiccator at 1755 cc, air atmosphere, a temperature of 25° C., and a humidity of 40%, to measure a hydrogen sulfide generation amount generated for 300 seconds from the start by using a hydrogen sulfide sensor, the hydrogen sulfide generation amount is 10 cc/g or less.   
     
     
         2 . The sulfide solid electrolyte material according to  claim 1 ,
 wherein the hydrogen sulfide generation amount is 5 cc/g or less.   
     
     
         3 . The sulfide solid electrolyte material according to  claim 1 ,
 wherein the sulfide solid electrolyte material is obtained by a raw material composition containing only Li 2 S and SiS 2 , and a molar fraction of the Li 2 S contained in the raw material composition is within a range of 50% to 80%.   
     
     
         4 . A lithium battery comprising a cathode active material layer containing a cathode active material, an anode active material layer containing an anode active material, and an electrolyte layer formed between the cathode active material layer and the anode active material layer;
 wherein at least one of the cathode active material layer, the anode active material layer and the electrolyte layer contains the sulfide solid electrolyte material according to  claim 1 .