NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, METHOD FOR MANUFACTURING THE SAME, LITHIUM ION SECONDARY BATTERY AND ELECTROCHEMICAL CAPACITOR

摘要

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery with a high charge/discharge capacity and an excellent in its cycle property.

SOLUTION: The negative electrode material for the nonaqueous secondary battery is composed of conductive powder which has surfaces of particles covered by carbon films, wherein the particles have a structure of crystallites of silicon dispersed in a silica-based compound. In this case, the negative electrode material for the nonaqueous electrolyte secondary battery is composed of the conductive powder in which the half value width of a diffraction peak that belongs to Si (111) in the vicinity of 2θ=28.4° is 1.0° or more and powder resistivity is 50 mΩ or less in an X-ray diffraction (Cu-Kα) with copper as an anticathode. The nonaqueous electrode secondary battery uses that negative electrode material.

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