Nonaqueous secondary battery

A nonaqueous secondary battery comprising:

• a positive electrode plate formed with a positive electrode mixture layer having a lithium composite oxide 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 m2/g,
• the positive electrode mixture layer containing a silane coupling agent, a coupling agent represented by General Formula (I), or a silane coupling agent and 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,
• (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), and
• the nonaqueous electrolyte containing a fluorinated cyclic carbonate ester represented by General Formula (II) at a content of 0.3% by mass or more with respect to the total mass of the nonaqueous electrolyte:
• (where each of X1 to X4 is a fluorine group, an alkyl group, or a fluorinated alkyl group, X1 to X4 are optionally the same as or different from each other, at least one of which is a fluorine group or a fluorinated alkyl group).