Using the nonaqueous electrolytic solution and non-aqueous electrolyte battery

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PROBLEM TO BE SOLVED : To provide a nonaqueous electrolyte the capacity deterioration and gas generation of which are suppressed during storage at high temperature, and to provide a nonaqueous electrolyte battery using the nonaqueous electrolyte.SOLUTION : The nonaqueous electrolyte containing a lithium salt and a nonaqueous organic solvent further contains dianhydride carboxylic acid shown by formula (1). (In the formula, Rand Rrepresent, respectively, an organic group of 20 or less C which may have a hydrogen atom or a substituent group independently, Rrepresents an organic group of 20 or less C which may have a substituent group, and m and n are an integer of 1 or more. When m and n are equal, Rand Rare different from each other. When m and n are different, Rand Rmay be identical or may be different. R, R, and Rmay be bonded each other to form a ring).