Patent ID: 8870978
Filing Date: 2014-10-28
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A method for manufacturing a jelly-roll type electrode assembly having a cathode/separation membrane/anode laminate structure, including: (a) coating both sides of a porous substrate with organic/inorganic composite layers, each of which includes inorganic particles and an organic polymer as a binder, so as to fabricate a composite membrane; and (b) inserting one end of a sheet laminate comprising a cathode sheet and an anode sheet as well as the composite membrane into a mandrel, winding the sheet laminate around the mandrel, and then, removing the mandrel, wherein at least one of the organic/inorganic composite layers includes microfine pores capable of moderating a variation in volume during charge/discharge of a secondary battery, and an interfacial friction coefficient between the composite membrane and the mandrel is not more than 0.28, wherein the composite membrane is formed by a process including: wherein the inorganic particle in step (ii) is added to the prepared solution after being dispersed in a second solvent.