[S-2].[Li+].[Li+].[P]=S.[F-:6].[Li+].[F-:8].[S:9]([Li:11])[Li:10].[P:12]12([S:24][P:22]3([S:25][P:15]([S:17][P:18]([S:21]3)([S:20]1)=[S:19])(=[S:16])[S:14]2)=[S:23])=[S:13].FF>>[S:9]([Li:11])[Li:10].[P:12]12([S:14][P:15]3([S:17][P:18]([S:21][P:22]([S:25]3)([S:24]1)=[S:23])(=[S:19])[S:20]2)=[S:16])=[S:13].[F:6][F:8]Lithium sulfide (Li2S) and phosphorus sulfide (P2S5) were used as the material composition, and lithium fluoride (LiF) was used as the fluoride. The powder of them was placed in a glove box in an atmosphere of argon, and 0.3828 g Li2S, 0.6172 g P2S5 and 0.01 g LiF were weighed and then these were mixed in an agate mortar. At this time, the ratio of Li2S and P2S5 was 75:25 on a molar basis. In addition, the amount of LiF added was 6.5 mole percent on a fluorine basis with respect to the solid electrolyte material to be obtained. Subsequently, the mixed composition was put into a 45 ml zirconia pot, zirconia balls were further put into the pot and then the pot was completely hermetically sealed. The pot was mounted on a planetary ball milling machine. Then, mechanical milling was performed at a rotational speed of 370 rpm for 40 hours. After that, the solid electrolyte material (Li2S—P2S5-based solid electrolyte material that contains fluorine) was obtained.
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