NOVELTY - A non-aqueous electrolyte solution secondary battery comprises non-aqueous electrolyte solution containing electrolyte dissolved in occludable and dischargeable positive electrode and negative electrode, separator, and non-aqueous solvent. Positive electrode and/or negative electrode are electrodes which have electrode mixture layer containing vinylidene fluoride polymer as electrode active material and a binder. Ratio (A1750/A3025) of light absorbency (A1750) of 1750 cm-1 vicinity with respect to light absorbency (A3025) of 3025 cm-1 vicinity of the polymer is 0.06-2.    USE - A non-aqueous electrolyte solution secondary battery for laptop computer, Electronic Book player, mobile telephone, portable facsimile, portable copy, portable printer, portable audio player, small video camera, liquid crystal television, handy cleaner, transceiver, electronic organizer, calculator, memory card, portable tape recorder, radio, backup power supply, motor vehicle, motorbike, bicycle with power engine, lighting fixture, toy, game machine device, timepiece, electric tool, electronic flash, and camera.    ADVANTAGE - The capacity reduction of a battery can be suppressed even when repeatedly charging/discharging under high temperature.    DETAILED DESCRIPTION - A non-aqueous electrolyte solution secondary battery comprises non-aqueous electrolyte solution containing electrolyte dissolved in occludable and dischargeable positive electrode and negative electrode, separator, and non-aqueous solvent. Positive electrode and/or negative electrode are electrodes which have electrode mixture layer containing vinylidene fluoride polymer as electrode active material and a binder. Ratio (A1750/A3025) of light absorbency (A1750) of 1750 cm-1 vicinity with respect to light absorbency (A3025) of 3025 cm-1 vicinity during measurement of infrared (IR) spectrum of vinylidene fluoride polymer is 0.06-2. The non-aqueous electrolyte solution contains isocyanate compound of formula (1).    R1= less than or equal to 30C organic group which may have hetero element; and    n=1-4.