Patent ID: 8709665

Claim:
A nonaqueous secondary battery comprising: a positive electrode plate formed with a positive electrode binder layer having a lithium composite oxide as a positive electrode active material; a negative electrode plate; a separator; and a nonaqueous electrolyte, the nonaqueous electrolyte containing a nitrile group-containing compound at a concentration of 0.05% by mass or more with respect to the total mass of the 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, and the positive electrode binder layer containing at least one of 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).