Patent ID: 6358646
Filing Date: 2002-03-19
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
A method of making a lithium secondary battery, comprising:making a positive electrode by coating an electrode composite onto a current collector, wherein the electrode composite contains at least a positive active material and a solid-state or a gel-state electrolyte; making a negative electrode by coating an electrode composite onto a current collector wherein the electrode composite contains at least a negative active material and a solid-state or a gel-state electrolyte; wherein at least one of the positive electrode or the negative electrode is made by: (a) mixing an electrode active material in an organic solvent to form a solution; coating the solution on a current collector; drying and pressing the coated solution, thereby forming an electrode active material sheet; (b) dipping the electrode active material sheet in an electrolytic solution prepared by mixing an electrolyte salt with an organic monomer having two or more polymeric functional groups at its chain ends, so that the electrode active material sheet is impregnated with the electrolytic solution and forms a liquid film of the electrolytic solution on a surface of the electrode active material sheet; (c) covering the surface of the electrode active material sheet with a mold releasing film and leaving a clearance of a desired thickness between them so the electrolytic solution exists in the clearance as the liquid film; and (d) polymerizing the organic monomer to form an organic polymer so that the electrolyte in the electrode active material sheet is brought into a solid-state or a gel-state, and an electrolyte layer composed only of the solid-state or the gel-state electrolyte is formed on a surface of the electrode active material sheet, wherein the positive electrode is opposite the negative electrode through the electrolyte layer.