| abstract |
The present invention is a silicon oxide used in the nonaqueous electrolyte secondary battery negative electrode material, obtained by cooling and precipitating a mixed gas of SiO gas and a silicon-containing gas, and having an oxygen content of 20 to 35% by mass, wherein the nonaqueous electrolyte secondary battery negative electrode A silicon oxide for reuse. According to the present invention, silicon oxide as a active material effective as a negative electrode material for a nonaqueous electrolyte secondary battery having high initial charge and discharge efficiency and excellent cycle characteristics while maintaining high battery capacity and low volume expansion ratio, and a method for producing the same, and A nonaqueous electrolyte secondary battery using the nonaqueous electrolyte secondary battery negative electrode using this silicon oxide can be provided. |