NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, METHOD FOR PRODUCING THE SAME, NEGATIVE ELECTRODE, AND BATTERY

摘要

PROBLEM TO BE SOLVED: To obtain a negative electrode active material which has a high initial battery capacity and is suppressed in deterioration of the performance even after a plurality of charge/discharge cycles are repeated, when a silicon-based substance having a high theoretical capacity is used as a negative electrode active material for a lithium ion secondary battery, and to provide a lithium ion secondary battery using the negative electrode active material.SOLUTION: A negative electrode active material having good cycle characteristics and a high battery capacity can be obtained by pulverizing silicon and copper oxide (2), or alternatively silicon, metallic copper and water, using a pulverization means and mixing the materials at the same time.