COMPOSITE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES AND METHOD FOR PRODUCING SAME

摘要

The purpose of the present invention is to provide: a composite active material for lithium secondary batteries, which is capable of providing a lithium secondary battery that has large charge and discharge capacity, high-rate charge and discharge characteristics and good cycle characteristics at the same time; and a method for producing the composite active material for lithium secondary batteries. A method of producing a composite active material for lithium secondary batteries of the present invention comprises: a mixing step wherein graphite having a specific surface area of 30 m2/g or more and a battery active material that is capable of combining with lithium ions are mixed with each other, thereby obtaining a mixture; and a spheroidizing step wherein the mixture is subjected to a spheroidization treatment, thereby producing a generally spherical composite active material for lithium secondary batteries, said composite active material containing graphite and the battery active material that is capable of combining with lithium ions.

主权项

1. A method for producing a composite active material for lithium secondary batteries comprising:
a mixing step of mixing graphite having a specific surface area of 30 m2/g or more and a battery active material capable of combining with lithium ions, to obtain a mixture; and a spheroidization step of subjecting the mixture to a spheroidization treatment, to produce a generally spherical composite active material for lithium secondary batteries, the composite active material containing graphite and a battery active material capable of combining with lithium ions.