Patent ID: 6337157
Filing Date: 2002-01-08
Classification: C01G,C01P,H01M,Y02E

Abstract:
A method for producing a cathode electroactive material comprising a compound oxide having a spinel structure, said compound oxide comprising lithium, manganese and oxygen and having an atomic ratio of lithium to manganese of Li/Mn=0.48 to 0.55, a true density of 4.05 g/cm3 or more and a lattice constant of 8.240 Ã¥ or less, which comprises mixing a lithium compound with manganese carbonate having a specific surface area of 10 m2/g or more, reacting the mixture at a temperature of from 350 to 680Â° C. for at least one hour, then crushing or pulverizing once, and heat-treating the resulting spinel structure compound oxide at a temperature of from 730 to 900Â° C.