Patent ID: 8383275

Claim:
A method of manufacturing a non-aqueous electrolyte secondary battery, comprising: preparing an electrode group which comprises a positive electrode, a negative electrode and a separator provided between the positive and negative electrodes and directly adjacent to the positive and negative electrodes, the separator consisting of a porous sheet made from at least one type of material selected from the group consisting of a polyolefin and a cellulose; heat pressing the electrode group at a temperature of 40 to 120° C. with a pressure of 0.01 to 20 kg/cm 2 ; making, after the heat pressing, the electrode group hold a non-aqueous electrolyte consisting essentially of a non-aqueous solvent and a lithium salt dissolved in the non-aqueous solvent, the non-aqueous solvent consisting essentially of 40% to 95% by volume of γ-butyrolactone and at least one second solvent selected from the group consisting of a cyclic carbonate, a chain carbonate, a chain ether, a cyclic ether, benzene, toluene, xylene, biphenyl, and terphenyl; and sealing the electrode group that holds the non-aqueous electrolyte in a jacket.