GRANULAR COMPOSITE CARBON MATERIAL AND ITS MANUFACTURING METHOD, AND NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY CELL, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY CELL AND LITHIUM ION SECONDARY CELL

摘要

PROBLEM TO BE SOLVED: To obtain a negative electrode material for a lithium ion secondary cell capable of exhibiting good charging/discharging characteristics and cycle characteristics, particularly excellent rapid charging/discharging efficiency when an aqueous binder is used and to provide a manufacturing method therefor, and to provide a negative electrode for the lithium ion secondary cell containing the negative electrode material, and to provide the lithium ion secondary cell using the negative electrode.

SOLUTION: In a granular composite carbon material, a hydrophilic vapor phase growth carbon fiber is stuck to at least a part of a granular carbon material containing a graphite material. The negative electrode material for the lithium ion secondary cell and the lithium ion secondary cell contain the granular composite carbon material. In the manufacturing method for the granular composite carbon material, the hydrophilic vapor phase growth carbon fiber is stuck to the granular carbon material containing the graphite material by imparting mechanical energy.

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