Patent ID: 6794084
Filing Date: 2004-09-21
Classification: C01B,H01M,Y02E

Abstract:
A method for making an electrode active material compound of the general formulaAaMb(PO4)cZd, wherein A comprises at least one alkali metal, M comprise at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, and mixtures thereof, Z is selected from the group consisting of a halogen, a hydroxyl group, and a mixture thereof, 0(a) forming an alkali metal hydrogen phosphate precursor compound having the formula AxH3âˆ’xPO4 wherein 0&lE;x&lE;3, and wherein A is said at least one alkali metal, by: (i) admixing an alkali metal-containing compound, a phosphate-supplying compound, and water to form an aqueous mixture, wherein said water is present in said aqueous mixture at a level from about 5% to about 25% by weight; and (ii) agitating said aqueous mixture to form said alkali metal hydrogen phosphate precursor compound; (b) intimately admixing said alkali metal hydrogen phosphate precursor compound and at least one M-containing compound to form a precursor composition mixture; and (c) heating said precursor composition mixture at a temperature and for a time sufficient to form said electrode active material compound.