Patent ID: 8088305

Claim:
A method of preparing a cathode material for lithium secondary batteries comprising: providing a mixture with at least one lithium compound, at least one iron compound, at least one phosphorous compound and a first carbon additive; first heating the mixture to a first temperature; second cooling the mixture to ambient temperature; providing a second carbon additive to the mixture, wherein the first and second carbon additives are selected from the group consisting of benzene naphthalene phenanthrene copolymer, benzene phenanthrene binary copolymer, benzene anthracene binary copolymer, poly benzene, soluble starch, polyvinyl alcohol, polypropylene, polypropylene amide, sucrose, glucose, urea, phenolic resin, furfural resin, urea-formaldehyde resin, epoxy resin, graphite and acetylene black; and third heating the mixture to a second temperature, wherein the second temperature is at least 80° C. higher than the first temperature.