NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, ITS MANUFACTURING METHOD, AND NONAQUEOUS SECONDARY BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To provide a negative electrode material for a nonaqueous electrolyte secondary battery having an excellent battery characteristics, especially a good cycle characteristics and charging/discharging capacitance.

SOLUTION: The negative electrode material for a nonaqueous electrolyte secondary battery comprises an active material containing a single element that can constitute an alloy with lithium or a compound containing the element, a carbon nanofiber which is grown from the surface of the active material, a catalyst that encourages growth of the carbon nanofiber, and a carbon coating layer that coats the active material and carbon nanofiber. The ratio in weight of the carbon coating layer against the carbon nanofiber is equal to 1/2 or less.

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