Negative active material for lithium secondary battery and manufacturing method of same
AssigneeSamsung SDI Co., Ltd.
InventorsKyou-Yoon Sheem, Sang-Young Yoon
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Abstract
The present invention relates to a negative active material for a lithium secondary battery and a manufacturing method thereof, wherein the negative active material comprises a crystalline or amorphous carbon core, a catalyst layer formed on the core, and carbon vapor growing fiber or carbon nanotubes. The negative active material not only forms a fine path between active materials but also improves conductivity between neighboring active materials so that a battery having improved high rate and cycle life characteristics can be provided, since carbon vapor growing fiber or carbon nanotubes are formed on a surface layer of the negative active material.
Claims14
A negative active material for a lithium secondary battery comprising crystalline or amorphous carbon comprising on a surface thereof one or more surface catalysts and at least one of carbon vapor growing fibers and carbon nanotubes.
A method for manufacturing a negative active material for a lithium secondary battery comprising the steps of:
- forming crystalline or amorphous carbon on which a surface catalyst element or compound thereof is doped or dispersed by mixing crystalline or amorphous carbon and the catalyst element or compound thereof;
- carbonizing crystalline or amorphous carbon on which the catalyst element or compound thereof is doped or dispersed;
- and
- forming carbon vapor growing fiber or carbon nanotubes on a surface of the crystalline or amorphous carbon which is carbonized by vapor depositing the carbonized crystalline or amorphous carbon at a temperature of 300 to 1500° C. under the existence of carbon-containing gas.
Dependencies are inferred from the claim text.