Ionic conductivity materials, suitable for constituting solid electrolytes for dry cells and batteries
AssigneeAgence Nationale de Valorisation de la Recherche
InventorsJean Rouxel, Luc Trichet
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Abstract
Novel compounds or compositions are provided capable of serving as solid electrolytes involving intercalated dichalcogenides having a combination of a tetravalent metal ion with a metal ion of lower oxidation state and a compensating amount of alkali metal ions to provide a substantially electrically neutral structure. The compositions have the formula: A.sub.x M.sub.x T.sub.1-x X.sub.2 where A is an alkali metal ion, M is a metal ion of lower valence state than T, T is a metal capable of forming a stable substantially electrically non-conductive intercalatable chalcogenide and X is a chalogen. Also included are batteries employing the subject compositions as the solid electrolyte.
Claims19
A composition having high ionic conductivity and minimal electronic conductivity comprising a stable, intercalatable chalcogenide having a wide energy gap between the bond band and the conduction band and having intercalated therein an equiatomic amount of an alkali metal ion and a metal ion having a valence state of one less than that of the metal of said chalcogenide.
Composition of the formula:
- A.sub.x M.sub.x T.sub.1-x X.sub.2
- wherein
- x is 0.2 to 0.8;
- A is Li or Na;
- M is Y, In, Bi, Sb, Cr or Ta;
- T is Zr, Hf, Th or Sn;
- and
- X is S, Se or Te.
A.sub.0.35-0.8 In.sub.0.35-0.8 Zr.sub.0.2-0.65 S.sub.2 wherein A is Li or Na.
A.sub.0.35-0.8 Y.sub.0.35-0.8 Zr.sub.0.2-0.65 S.sub.2 wherein A is li or Na.
A.sub.0.35-0.8 In.sub.0.35-0.8 Sn.sub.0.2-0.65 S.sub.2 wherein A is li or Na.
Dependencies are inferred from the claim text.