| 主权项 |
1. A method for manufacturing a nonaqueous electrolyte secondary battery, the method comprising:
preparing a positive-electrode active material including sulfate ions by not less than 0.04 mmol/m2 but not more than 0.16 mmol/m2 per unit specific surface area; manufacturing a positive electrode by use of the positive-electrode active material including sulfate ions; manufacturing a negative electrode by use of a negative-electrode active material; assembling a battery assembly by accommodating the positive electrode, the negative electrode, and a nonaqueous electrolyte including lithium difluoro bis-oxalate phosphate in a battery outer case, wherein an additive amount X (μmol) of the lithium difluoro bis-oxalate phosphate in the nonaqueous electrolyte is determined so as to satisfy the following formula (I):0.004≦X(Sc·Wc+Sa·Wa)≦0.037(I)(in the formula (I), Sc indicates a specific surface area (m2/g) of the positive-electrode active material, We indicates a mass (g) of the positive-electrode active material, Sa indicates a specific surface area (m2/g) of the negative-electrode active material, and Wa indicates a mass (g) of the negative-electrode active material); and
performing a charging process on the battery assembly at least once, so as to form films on surfaces of the positive-electrode active material and the negative-electrode active material. |
