Celgard Inc.

Celanese Ventures Gmbh

Shizuo Ogura

Ronald W Call

Xiangyun Wei

Barrie Davies

Makoto Murata

Hidehisa Mokudai

Lie Shi

Zhengming Zhang

Donald K Simmons

Premanand Ramadass

J Robert Dees

A multi-layer microporous battery separator which comprises: a high molecular weight polypropylene layer having a melt flow index of &#x2266;1.2 measured at layer; a polyethylene layer; and a high molecular weight polypropylene layer having a melt flow index of &#x2266;1.2 measured at layer. The resulting microporous battery separator which is formed by a dry stretch process produces the microporous battery separator which has a porosity of &#x2266;37% while maintaining a gurley from 13-25 seconds and a thickness of &#x2266;25 microns.

Multilayer separator exhibiting improved strength and stability

An electrode includes an electrically conductive matrix containing a disulfide group, wherein an S&#x2014;S bond of the disulfide group is cleaved by electrochemical reduction and reformed by electrochemical oxidation. A plurality of carbon nanotubes are substantially disentangled and dispersed in the electrically conductive matrix. The electrode can be used as a cathode of a lithium battery. A method for producing disentangled carbon nanotubes includes the steps of: adding a plurality of aggregates of carbon nanotubes to a liquid; and providing sheer force (e.g. passing the liquid through a narrow gap at a high speed) onto the liquid for disentangling the aggregates of carbon nanotubes therein.

Lithium battery and electrode

The present invention is directed to a battery separator. The battery separator comprises a microporous film having a first portion and a second portion. The first portion is bonded to the second portion. The bond has a strength greater than 5 g/in. The film has a thickness less than 1.7 mils, a Gurley of less than 50 sec/10 cc, and a puncture strength of greater than 400 g/mil.

Battery separator

An electrode includes an electrically conductive matrix containing a disulfide group, wherein an S&mdash;S bond of the disulfide group is cleaved by electrochemical reduction and reformed by electrochemical oxidation. A plurality of carbon nanotubes is dispersed in the electrically conductive matrix. The electrode can be used as a cathode of a lithium battery.

Growing community of inventors

Charlotte, NC, United States of America

Shizuo Ogura