| 摘要 |
PROBLEM TO BE SOLVED: To produce a composite carbon particle having a high charge and discharge capacity and suitable as a negative pole material for a lithium secondary battery or cell improved in problems such as deterioration of slurry characteristics, orientation of the particle in a collector planar direction, deterioration of cycle characteristics and an irreversible increase in capacity when using a conventional expanded graphite particle as the negative pole material for the lithium secondary battery or cell, to provide a method for producing the composite carbon particle, to obtain the negative pole material and to provide both the negative pole for the lithium secondary battery or cell and the lithium secondary battery or cell. SOLUTION: This composite carbon particle contains an expanded graphite part and an amorphous carbon part. The method for producing the composite carbon particle comprises dissolving an organic compound in a solvent, mixing and dispersing an expanded graphite particle in the resultant solution, removing the solvent, drying the resultant mixture and then carbonizing the organic compound. The negative pole material contains the above composite carbon particle or the composite carbon particle obtained by the above method for production. The negative pole for the lithium secondary battery or cell uses the negative pole material. The lithium secondary battery or cell has the negative pole for the lithium secondary battery or cell. |
