Patent ID: 6805996
Filing Date: 2004-10-19
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
A method for the preparation of a positive electrode active material comprising the steps of:(a) mixing a cobalt compound, a lithium compound, a compound of at least one element selected from the group consisting of aluminum, chromium, vanadium, manganese and iron and a compound of at least one element selected from the group consisting of magnesium and calcium, at a pre-set ratio; and (b) sintering a mixture from the mixing step to produce a compound represented by the general formula LiCoxAyBzO2 where A denotes at least one element selected from the group consisting of Al, Cr, V, Mn and Fe, and B denotes at least one element selected from the group consisting of Mg and Ca, and x, y and z are such that 0.9&lE;x<1, 0.001&lE;y&lE;0.05, and 0.001&lE;z&lE;0.05; the compound of at least one element selected from the group selected from the group consisting of magnesium and calcium, as used in the mixing step, being magnesium carbonate or calcium carbonate.