Celgard Inc.

Khuy Van Nguyen

Ronald W Call

Xiaomin Zhang

Lie Shi

Zhengming Zhang

Pankaj Arora

Donald K Simmons

C William Fulk, Jr

Tien Dao

C Glen Wensley

Wei-Ching Yu

Robert W Callahan

Shawn E Hux

Pierre C Cook

William C Fulk

A battery separator comprises a co-extruded, microporous membrane having at least two layers made of extrudable polymers and having: a uniform thickness defined by a standard deviation of &#x3c;0.80 microns (&#x3bc;m); or an interply adhesion as defined by a peel strength &#x3e;60 grams.

Co-extruded, multi-layered battery separator

Method of making a co-extruded, multi-layered battery separator

A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125&#xb0; C., a second substantially horizontal slope at greater than 225&#xb0; C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.

Battery separator with Z-direction stability

The instant invention is directed to a battery separator including a microporous polyolefinic membrane having a porosity in a range 30-80%, an average pore size in a range of 0.02-2.0 microns, and being made from a blend of a polyolefin polymer and an oligomer of a polyolefinic polymer.

Shutdown battery separator made with a blend of polymer and oligomer

A fusible, structurally stabilized battery separator is disclosed. The separator is formed by extruding a cylindrical parison of a polymer film and quenching the film on both sides with a low temperature fluid stream prior to processing the film to impart microporosity. Most preferably, the film includes at least a polyethylene layer and polypropylene layer.

Structurally stable fusible battery separators and method of making same

The present invention is directed to a hydrophilic polyolefin article comprising a polyolefin article having a coating containing a surfactant and an ethylene vinyl alcohol (EVOH) copolymer.

Hydrophilic polyolefin having a coating containing a surfactant and an EVOH copolymer

Growing community of inventors

Charlotte, NC, United States of America

Khuy Van Nguyen