| CPC H01M 10/0562 (2013.01) [H01M 2300/008 (2013.01)] | 11 Claims |

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1. A lithium ion conductive solid electrolyte material consisting of
Li, La, O, and X,
wherein X is at least one element selected from the group consisting of Cl, Br, and I,
wherein the lithium ion conductive solid electrolyte material is denoted by Composition formula (1) below,
Li2+b-3aLaaOXb (1)
wherein mathematical formulae below
1.0≤a≤2.0,
1.5≤b≤6.0, and
a≤2+b−3a,
are satisfied.
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