Patent ID: 8563179

Claim:
A nonaqueous secondary battery comprising: a positive electrode plate formed with a positive electrode mixture layer having a lithium transition-metal composite oxide comprising at least one metal selected from the group consisting of Co, Ni and Mn as a positive electrode active material; a negative electrode plate; a separator; and a nonaqueous electrolyte, the positive electrode active material having an average particle diameter of 4.5 to 15.5 μm and a specific surface area of 0.13 to 0.80 m 2 /g, the positive electrode mixture layer containing a coupling agent represented by General Formula (I) at a content of 0.003% by mass or more and 5% by mass or less with respect to the mass of the positive electrode active material, and the nonaqueous electrolyte containing a DOX derivative represented by General Formula (II) at a content of 0.05% by mass or more and 3.0% by mass or less with respect to the total mass of the nonaqueous electrolyte: (where M is one atom selected from Al, Ti, and Zr, each of R1 and R2 is an alkyl group or an alkoxy group having 1 to 18 carbon atoms, and n represents an integer of 1 to 4), (where each of R1 to R4 is a hydrogen atom, a fluorine atom, a hydroxyl group, an alkyl or alkoxy group having 1 to 4 carbon atoms, an aryl group, a vinyl group, or an allyl group); wherein the coupling agent represented by General Formula (I) is at least one compound selected from a group consisting of aluminum ethyl acetoacetate diisopropylate, aluminum tris(ethyl acetoacetate), aluminum bis(ethyl acetoacetate) mono(acetyl acetonate), and aluminum tris(acetyl acetoacetate); and wherein the DOX derivative represented by General Formula (II) is at least one compound selected from a group consisting of: 1,3-dioxane; 2-methyl-1,3-dioxane; 4-methyl-1,3-dioxane; 2,4-dimethyl-1,3-dioxane; 4-phenyl-1,3-dioxane; 2,2-dimethyl-5-hydroxy-1,3-dioxane; 4,4,6-trimethyl-2-vinyl-1,3-dioxane; 5-aryl-1,3-dioxane; and 5-ethoxy-1,3-dioxane.