| CPC H01M 10/0562 (2013.01) [H01M 10/0525 (2013.01); H01M 2300/0068 (2013.01)] | 3 Claims |

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1. A solid electrolyte composition comprising a sulfur element-free ionic solid electrolyte material and an organic solvent, wherein:
the ionic solid electrolyte material is Li3YBr2Cl4, Li2.8Ca0.1Y0.5Gd0.5Br2Cl4, or Li2.5Y0.5Zr0.5Cl6,
the organic solvent includes at least one selected from the group consisting of tetralin, ethylbenzene, mesitylene, pseudocumene, cumene, 1,2,4-trichlorobenzene, chlorobenzene, 2,4-dichlorotoluene, o-chlorotoluene, p-chlorotoluene, 1,4-dichlorobutane, 3,4-dichlorotoluene, and tetraethyl orthosilicate.
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