NOVELTY - A non-aqueous secondary battery comprises: 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 non-aqueous electrolyte containing 1,3-dioxane (DOX) derivative; where the positive electrode mixture layer contains at least one silane coupling agent and/or at least one aluminum, titanium or zirconium based coupling agent (I).    USE - As non-aqueous secondary battery (claimed) for driving portable electronic equipment, such as cell phones, portable personal computers, and portable music players, and as power supplies for hybrid electric vehicles (HEVs) and electric vehicles (EVs).    ADVANTAGE - The non-aqueous secondary battery has good charge and discharge cycle characteristics at high temperature (high-temperature cycle characteristics) and suppresses an increase in self-discharge after repetition of charge and discharge cycles at high temperature; and has superior high-temperature cycle characteristics.    DETAILED DESCRIPTION - A non-aqueous secondary battery comprises: 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 non-aqueous electrolyte, where the positive electrode active material have an average particle diameter of 4.5-15.5 mu m and a specific surface area of 0.13-0.80 m2/g, where the positive electrode mixture layer contains at least one silane coupling agent and/or at least one aluminum, titanium or zirconium based coupling agent of formula (I) at a content of 0.003-5 mass.% with respect to the mass of the positive electrode active material, and the non-aqueous electrolyte contains a 1,3-dioxane (DOX) derivative of formula (II) at a content of 0.05-3 mass.% with respect to the total mass of the non-aqueous electrolyte.    M=Al, Ti, or Zr;    R-1 and R2=alkyl or 1-18C alkoxy;    n=1-4;    R1-R4=H, fluoro, hydroxyl, alkyl, 1-4C alkoxy, aryl, vinyl, or allyl.