NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, METHOD OF PRODUCING NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY AND LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To minimize the irreversible capacity by enhancing the cycle characteristics of a lithium ion secondary battery.

SOLUTION: A negative electrode material contains carriers and silicon/amorphous carbon composite particles. In the carriers, carbon fibers having electron conductivity entwine each other. There are clearances which allow for infiltration of fluid between the carbon fibers. The silicon/amorphous carbon composite particles infiltrate the clearances and are dispersed within the carriers and carried thereon. The silicon/amorphous carbon composite particles include silicon particles and a surface adhesion matter. The surface adhesion matter is composed of amorphous carbon and adheres to the surface of silicon particles.

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