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AssigneeValence Technology, Inc.
InventorsJeremy Barker, Richard Gover, Paul Burns, Aiden Bryan
Estimating the term…
The present invention provides for the preparation of an “optimized” VPO4 phase or V—P—O/C precursor. The VPO4 precursor is an amorphous or nanocrystalline powder. The V—P—O/C precursor is amorphous in nature and contains finely divided and dispersed carbon. Throughout the specification it is understood that the VPO4 precursor and the V—P—O/C precursor materials can be used interchangeably to produce the final vanadium phosphates, with the V—P—O/C precursor material being the preferred precursor. The precursors can subsequently be used to make vanadium based electroactive materials and use of such precursor materials offers significant advantages over other processes known for preparing vanadium phosphate compounds.
A method for making a vanadium phosphate precursor comprising mixing V2O5 with a phosphate compound and a carbon containing compound or a carbon precursor to form a mixture, milling or micronizing the mixture, and heating the milled or micronized mixture at a temperature of from about 400° C. to about 900° C. and for a time sufficient to form a precursor selected from the group consisting of amorphous V—P—O/C precursor and nanocrystalline VPO4 precursor.
A method for making a vanadium phosphate precursor comprising mixing V2O5 with a phosphate compound and heating the mixture in a reducing atmosphere at a temperature and for a time sufficient to form a precursor selected from the group consisting of amorphous V—P—O/C precursor and nanocrystalline VPO4 precursor.
The method according to claiml8 wherein the temperature is from about 700° C. to about 800° C.
Dependencies are inferred from the claim text.