Methods of manufacturing negative material and secondary battery

摘要

To provide a method of manufacturing a negative material and a secondary battery, which can achieve a great charging-discharging capacity and improve a charging-discharging cycle property. A winding electrode body wound a belt-shaped positive electrode and a belt-shaped negative electrode within a separator in between is inserted inside a battery can. The negative electrode is produced with crushed silicon or a silicon compound in an oxygen partial pressure atmosphere within a value from higher than 10 Pa to lower than an oxygen partial pressure of air. By crushing silicon or a silicon compound in such an oxygen partial pressure atmosphere, an oxide film formed thereon can become thinner and electron conductivity between its particles can be improved, which leads to an improved charging-discharging property.