Patent ID: 7125431

Claim:
A method for adhesion of wound electrodes or electrode lamination for use in a lithium-ion secondary battery, the method comprising the: (a) coating a polymer solution selected from the group of polymers consisting of: (i) a Z-type polycarbonate in a solvent selected from the group of dichloromethane, ethyl carbonate, propyl carbonate, diethyl carbonate and mixtures thereof; (ii) vinylidene bifluoride/hexafluoroproylene copolymer in an admixture of acetone and tetrahydrofuran; (iii) diphenol A-diphenol carbonate copolymer in tetrahydrofuran; and (iv) polyamide in methanol on surfaces of positive and negative electrode sheets forming adhesive surfaces on the sheets; (b) forming a laminated electrode by sandwiching an isolation layer between the coated surfaces of the electrode sheets; and (c) vaporizing the solvent to separate the polymer to cohere the electrode sheets with the isolation layer whereby the electrode sheets are firmly and evenly laminated on the isolation layer.