To provide a nonaqueous electrolytic secondary battery which is arranged to offer a high level of safety even when being overcharged, and is arranged to reduce the amount of gas generated while the battery is continuously charged, or repeatedly charged and discharged.
A nonaqueous electrolytic secondary battery of the present invention comprises a positive electrode active material, and a nonaqueous electrolyte. The positive electrode active material includes a mixture of a group of large-diameter particles having a central particle diameter of 15-30 μm, a group of middle-diameter particles having a central particle diameter of 12-20 μm, and a group of small-diameter particles having a central particle diameter of 1-8 μm, and satisfies the following relation: the group of large-diameter particles is larger than the group of middle-diameter particles in central particle diameter. The amount of the group of middle-diameter particles is 10-50 mass%, and the amount of the group of small-diameter particles is 10-30 mass% to the total mass of the positive electrode active material. The nonaqueous electrolyte includes: 0.1-2.0 mass% of 2-(methylsulfonyloxy)propionic acid 2-propyne-1-yl; 0.5-3.0 mass% of 1,3-dioxane; 0.05-0.3 mass% of adiponitrile; and 0.5-3.0 mass% of at least one of cycloalkyl benzene and compounds having quaternary carbons neighboring benzene rings.
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MORIMOTO TAKUYA
OSHITA RYUJI
