NEGATIVE ELECTRODE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, MANUFACTURING METHOD OF SAME NEGATIVE ELECTRODE MATERIAL, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTTERY USING SAME NEGATIVE ELECTRODE MATERIAL

摘要

PROBLEM TO BE SOLVED: To prevent acicular metal lithium from precipitating on a surface of a negative electrode, and enhance electrochemical activity in order to increase capacity.

SOLUTION: The nonaqueous electrolyte secondary battery comprises a negative electrode 9 having bond of silicon with nitrogen which lithium can be electrochemically inserted into and removed from, and having a silicon nitride compound as an active material containing carbon formed by pyrolytically decomposing silazane compounds belonging to inorganic polymer by heating treatment at 500-700°C, a positive electrode 8 having a lithium compound as an active material, and a nonaqueous electrolyte. Thereby, the electrochemical activity in the negative electrode 9 is enhanced to increase the capacity, and the acicular metal lithium does not precipitate on the surface of the negative electrode 9.

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