Composite element having a titanium chalcogenide or oxychalcogenide layer, more particularly usable as the positive electrode in a thin film electrochemical cell
AssigneeCentre National De La Recherche Scientifique
InventorsGeorges Meunier, Richard Dormoy, Alain Levasseur
Life of this patent
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Abstract
The invention relates to a composite element usable in an electrochemical generator. The element comprises a substrate (1) covered by cathodic sputtering with a layer (5) of amorphous material TiO.sub.a X.sub.B with X=S, Se or Te and 0.01<a.ltoreq.2, 0.01<b.ltoreq.3, 2.ltoreq.a+b.ltoreq.3. The layer (5) consitutes the positive electrode of the generator and it can be associated with a lithium negative electrode (9) and a lithium ion conductive glass electrolyte (7).
Claims11
Composite element constituted by a substrate coated by cathodic sputtering of a homogeneous, continuous, compact, thin layer of an isotropic, X-ray amorphous material in accordance with the formula:
- TiO.sub.a X.sub.b
- in which X represents a sulphur, selenium or tellurium atom and a and b are such that 0.01.ltoreq.a.ltoreq.2, 0.01.ltoreq.b.ltoreq.2 and 2.ltoreq.a+b.ltoreq.3, said coating having a thickness of 200 nm to 10 .mu.m, an amorphous structure and a density lower than that of crystallized TiO.sub.2 or TiS.sub.2, without surface porosity.
Electrochemical cell having a positive electrode, a negative electrode able to release an alkali metal ion or proton and an ionic conductive electrolyte positioned between the two electrodes, characterized in that the positive electrode is formed by a homogenous, continuous, composite, thin coating of isotropic, X-ray-amorphous material, deposited by cathodic sputtering and in accordance with the formula:
- TiO.sub.a X.sub.b
- in which X represents S, Se or Te, and a and b are such that 0.01.ltoreq.a.ltoreq.2, 0.01.ltoreq.b.ltoreq.2 and 2.ltoreq.a+b.ltoreq.3, said coating having a thickness of 200 nm to 10 .mu.m, an amorphous structure and a density lower than that of crystallized TiO.sub.2 or TiS.sub.2, without surface porosity.
Dependencies are inferred from the claim text.