Patent ID: 8697290
Filing Date: 2014-04-15
Classification: H01M,Y02E,Y10T

Abstract:
1. An electrode/separator assembly, comprising: an electrode comprising an electrode current collector and an electroactive material layer disposed on one or both sides of the electrode current collector; and a porous multilayer composite separator layer disposed on one or both sides of the electrode, wherein said multilayer composite separator layer comprises at least first and second layers, said first and second layers comprising inorganic particulate material(s) and organic polymer(s) having different inorganic particulate material/organic polymer weight ratios; wherein the first layer of the multilayer composite separator layer having a first weight percent of polymer is disposed over the electrode; and the second layer containing a higher weight percentage of organic polymer than the first layer is disposed as the outermost layer of the multilayer composite separator; and wherein the thickness of said first layer is at least 80% of the total thickness of the multilayer composite separator; said first layer comprises greater than 50% inorganic particulate material by weight; and said second layer comprises greater than 50% organic polymer by weight.