NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To improve battery capacity and cycle characteristics significantly in a lithium ion secondary battery. SOLUTION: Thin piece-like graphite powder made by forming graphite powder of 1 to 50μm average diameter and of 5 to 50m<2> /g specific surface area into thin piece-like of 1μm or less is used as a conductive substance in a positive electrode mixture. The adding amount thereof is set to be 0.5 to 9.5 percentage by weight against the positive electrode mixture. Thereby, the conductive substance in the positive electrode mixture displays superior conductivity so that electrons can be carried to positive electrode active material uniformly and effectively. Therefore, the containing amount of the conductive substance is reduced so that the containing amount of the positive electrode active material can be increased.