Teijin Techno Products Ltd. (Tokyo, Japan), a Teijin group company producing advanced aramid fibers, has developed what it says is the world's first mass-producible aramid nanofiber to offer reliable heat and oxidation resistance. Until now, says Teijin, aramid nanofibers have been produced only in laboratories, so this first commercially viable product represents a significant step forward in the evolution of this new material. Teijin's nanofiber, which is uniformly sized with a diameter of just several hundred nanometers, is based on Teijin's proprietary Teijinconex heat-resistant meta-aramid. It will be marketed in the form of nonwoven sheet for separators in lithium ion batteries (LIBs). Commercial production is targeted at 2014. The sheet maintains its shape up to 300°C/572°F and is highly resistant to oxidation. Other features include: high porosity that promotes smooth mobility of the electrolyte, resulting in higher output and faster charging; a large surface area that helps hold the electrolyte effectively to maintain battery performance at low temperatures when ion conductivity drops; it absorbs electrolytes more rapidly than conventional polyolefin-based separators, helping to shorten the time required to pour electrolyte into the battery, thereby reducing the production cost of large batteries.
Editor PickDuPont to cease Kevlar production in South Carolina
The company will transition the Kevlar manufacturing operations in South Carolina to its Virginia site.