Patent ID: 7875380
Filing Date: 2011-01-25
Classification: B32B,H01M,Y02E,Y10S,Y10T

Abstract:
1. A complex membrane for an electrochemical device, comprising: a strength support layer; and a web-phase electrospinning membrane united to at least one side of the strength support layer and made of polymer, wherein the strength support layer is a micro-porous polyolefin membrane having a mean flow pore size of 0.005 to 3 μm and a porosity of 30 to 80%, and wherein the electrospinning membrane is a web-phase porous membrane in which nano-fibers are accumulated by electrospinning to have a mean flow pore size of 0.01 to 3 μm and a porosity of 60 to 95%, whereby the complex membrane is a multi-layer complex membrane having a mean flow pore size of 0.01 to 1.5 μm, a porosity of 40% or above and a thickness of 5 to 70 μm.