Non-aqueous electrolyte secondary battery

摘要

There is disclosed a non-aqueous electrolyte secondary battery in which carbonaceous material is used as the anode active material and charge/discharge is carried out by doping/undoping of lithium. The carbonaceous material has a grading distribution such that the 10% cumulative or accumulated diameter is 6 to 20 mu m, the 50% cumulative diameter is 20 to 55 mu m, and the 90% cumulative diameter is 55 to 90 mu m. When a carbonaceous material such that the grading distribution satisfies the above condition is used as the anode active material, the self-discharge rate is suppressed and occurrence of an internal short-circuit is also prevented.