METHOD FOR PRODUCING NEGATIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES AND METHOD FOR MANUFACTURING NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The present invention is a method for producing a negative electrode active material for nonaqueous electrolyte secondary batteries containing a silicon compound (SiOx wherein 0.5 ≤ x ≤ 1.6) that contains lithium. This method for producing a negative electrode active material for nonaqueous electrolyte secondary batteries comprises: a step wherein a silicon compound (SiOx wherein 0.5 ≤ x ≤ 1.6) is prepared; and a step wherein lithium is intercalated into the silicon compound by means of electrolysis that is caused by producing a potential difference between the silicon compound and a counter electrode by immersing the silicon compound and the counter electrode into a nonaqueous solution that contains at least lithium nitrate and/or lithium nitrite. Consequently, the present invention provides a method for producing a negative electrode active material for nonaqueous electrolyte secondary batteries, said negative electrode active material for nonaqueous electrolyte secondary batteries being capable of increasing the battery capacity, while being also capable of improving the cycle characteristics and initial efficiency.