Hoover's - Valence Technology - Patent

Synthesis of cathode active materials

03/11/2008 11:20:00 AM EDT
U.S. Patents

Pub. Number US7338647
Appl. Data 10 20040520
Applicant Valence Technology, Inc.
Inventor(s) Huang, Biying
Swoyer, Jeffrey
Saidi, M. Yazid
Huang, Haitao
Title Synthesis of cathode active materials
Abstract The present invention relates to a method for
preparing an electroactive metal polyanion or a mixed metal polyanion
comprising forming a slurry comprising a polymeric material, a solvent, a
polyanion source or alkali metal polyanion source and at least one metal ion
source; heating said slurry at a temperature and for a time sufficient to
remove the solvent and form an essentially dried mixture; and heating said
mixture at a temperature and for a time sufficient to produce an electroactive
metal polyanion or electroactive mixed metal polyanion. In an alternative
embodiment the present invention relates to a method for preparing a metal
polyanion or a mixed metal polyanion which comprises mixing a polymeric
material with a polyanion source or alternatively an alkali metal polyanion
source and a source of at least one metal ion to produce a fine mixture and
heating the mixture to a temperature higher than the melting point of the
polymeric material, milling the resulting material and then heating the milled
material. It is another object of the invention to provide electrochemically
active materials produced by said methods. The electrochemically active
materials so produced are useful in making electrodes and batteries.

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