| abstract |
The particulate silicon oxide having a Cu content of 100 to 20,000 ppm, an Fe content of 20 to 1,000 ppm, an Al content of 1,000 ppm or less, an average particle size of 0.1 to 30 μm and a BET specific surface area of 0.5 to 30 m 2 / g, And is used as an anode material in manufacturing an electrolyte secondary battery. The secondary cell improves cycle performance while maintaining a high battery capacity and low volume expansion of the silicon oxide. |