Process for producing filament-like vanadium oxide for use in solid state rechargeable electrochemical cells and the use thereof as a cathode in electrochemical cells
OwnerOn-Kok Chang, M. Yazid Saidiinventors
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Abstract
The present invention provides a novel process for synthesizing vanadium oxide V.sub.6 O.sub.13 with a filament-like morphology by thermally decomposing ammonium metavanadate NH.sub.4 VO.sub.3 in the presence of a compound which sublimes upon heating. The reaction is carried out in an inert gas flow. The V.sub.6 O.sub.13 synthesized according to this invention can be used as cathode active material in electrochemical batteries.
Claims21
A method for synthesizing vanadium oxide comprising the steps of:
- preparing a mixture of an ammonium vanadate and a sublimation compound which sublimes upon heating;
- heating the mixture in an inert gas flow, to a temperature to sublime said compound and to thermally decompose the ammonium vanadate, to form a vanadium oxide product;
- and cooling the product to ambient temperature in an inert gas atmosphere.
A vanadium oxide which is characterized by a fiber structure and having a composition V.sub.6 O.sub.x wherein X is between about 13.35 and about 14.05, which is prepared by a method comprising the steps of:
- preparing a mixture of an ammonium vanadate and a sublimation compound which sublimes upon heating;
- heating the mixture in an inert gas flow, to a temperature to sublime said compound and to thermally decompose the ammonium vanadate, to form a vanadium oxide product;
- and cooling the product to ambient temperature in an inert gas atmosphere.
A cathode for use in a rechargeable electrochemical cell wherein a cathode active material is a vanadium oxide which is characterized by a fiber structure having a composition V.sub.6 O.sub.x wherein X is between about 13.35 and about 14.05, which is prepared by a method comprising the steps of:
- preparing a mixture of an ammonium vanadate and a sublimation compound which sublimes upon heating;
- heating the mixture in an inert gas flow, to a temperature to sublime said compound and to thermally decompose the ammonium vanadate, to form a vanadium oxide product;
- and cooling the product to ambient temperature in an inert gas atmosphere.
A rechargeable electrochemical cell containing a cathode and an anode wherein a cathode active material is a vanadium oxide which is characterized by a fiber structure having a composition V.sub.6 O.sub.x wherein X is between 13.35 and 14.05, which is prepared by a method comprising the steps of:
- preparing a mixture of an ammonium vanadate and a sublimation compound which sublimes upon heating;
- heating the mixture in an inert gas flow, to a temperature to sublime said compound and to thermally decompose the ammonium vanadate, to form a vanadium oxide product;
- and cooling the product to ambient temperature in an inert gas atmosphere.
Dependencies are inferred from the claim text.