| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery with high capacity and excellent charging/discharging cycle characteristics by restricting the collapse of a negative electrode structure and the decrease of the capacity with the repetition of charging and discharging. SOLUTION: A nonaqueous electrolyte secondary battery is provided with positive collector 1 with transition metal composite oxide containing lithium as positive electrode active material, nonaqueous electrolyte and negative collector 3 with carbon material as negative electrode active material. The carbon material is a mixture of graphite, the first non-graphite carbon material and the second non-graphite carbon material. The first non-graphite carbon material (amorphous carbon) accounts for 4-40% of the total weight of the graphite and the first non-graphite carbon material, with the average particle sizes being 0.3-3 times the average particle sizes of the graphite. For the second non- graphite carbon material (acetylene black), the mixture ratio of the weight to the total weight of the graphite and the first non-graphite carbon material is 20% or less, with the average particle sizes being smaller than the particles sizes of the graphite and the first non-graphite carbon material, 0.1 μm or less. |
