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AssigneeCelgard, LLC
InventorsXiaomin Zhang, Lie Shi, William John Paulus
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An improved multilayer laminated microporous battery separator for a lithium ion secondary battery, and/or a method of making or using this separator is provided. The preferred inventive dry process separator is a tri-layer laminated Polypropylene/Polyethylene/Polypropylene microporous membrane with a thickness range of 12 μm to 30 μm having improved puncture strength and low electrical resistance for improved cycling and charge performance in a lithium ion battery. In addition, the preferred inventive separator's or membrane's low Electrical Resistance and high porosity provides superior charge rate performance in a lithium battery for high power applications.
A separator having three layers having the formation of two outer layers and one interior layer, each layer produced according to a dry stretch process in which a polyolefin resin, mix or blend is extruded to form said layers, said resin of each of the outer layers having a melt flow index (MFI) of less than or equal to about 0.8 grams/10 minute;
Dependencies are inferred from the claim text.