Patent ID: 7824802
Filing Date: 2010-11-02
Classification: H01M,Y02E

Abstract:
1. A method of preparing a composite cathode material consisting of the steps of: (a) Mixing and milling together the starting materials carbon and an organic acid complexing agent with not more than the weight percentage of carbon being in the range from 1 to 10% versus the theoretical weight of the cathode active material which is calculated from the weight of staring materials under non-aqueous condition conditions to form a mixture; (b) Heating the mixture at a first temperature of from 250° C. to 450° C. under an inert atmosphere to form a composite precursor; (c) Grinding and pelletizing the resulting composite precursor to form a pellet; and (d) Re-heating said pellet at a second temperature of from 500° C. to 950° C. under an inert atmosphere to form the composite cathode; wherein the composite cathode material has a general formula of LiFe