Synthesis of metal phosphates
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United States of America Patent
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Jun 13, 2006
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app pub date -
Mar 4, 2004
filing date -
Mar 4, 2004
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Abstract
The present invention relates to a method for preparing a metal phosphate which comprises milling in a carbonaceous vessel a lithium source, a phosphate source, such as LiH.sub.2PO.sub.4, and a metal oxide containing a metal ion wherein the metal ion is capable of being reduced, to produced a milled mixture and heating the milled mixture in an inert atmosphere at a temperature and for a time sufficient to form a metal phosphate wherein the metal ion of the metal oxide is reduced in oxidation state without the direct addition of a reducing agent to the starting materials. In another embodiment the present invention relates to a method for preparing a mixed metal phosphate which comprises milling a lithium source and a phosphate source, such as LiH.sub.2PO.sub.4, a metal oxide and another metal compound wherein at least one of the metal compounds contains a metal ion capable of being reduced to produce a milled mixture and heating the resulting milled mixture in an inert atmosphere at a temperature and for a time sufficient to form a mixed metal phosphate, wherein the oxidation state of at least one of the metal ions is reduced in oxidation state without the direct addition of a reducing agent to the reactants. It is another object of the invention to provide electrochemically active materials produced by said methods.
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