Titanate-based solid electrolyte materials

Abstract

This invention provides a titanate-based solid electrolyte material that does not produce hydrogen sulfide, does not contain rare earth elements, and exhibits excellent thermal stability. The invention relates to a titanate-based solid electrolyte material 1, characterized by comprising a titanate having the following structure: a plurality of main layers 2 are stacked, and lithium ions 3 and divalent or higher cations (α)4 are disposed between the layers of the main layers 2; the main layers 2 are formed by interlocking octahedra with six oxygen atoms aligned to titanium atoms in a two-dimensional manner with shared edges; a portion of the titanium sites in the main layers 2 are replaced by at least one of a divalent to trivalent cation (β) and a vacancy; the titanate is obtained by treating a fibrous titanate in the presence of a mixed molten salt of lithium salt and cation (α)4.

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