Teijin Develops World’s First Mass-production Aramid Nanofiber — Promising Material For Heat-resistant Separators In Batteries
Teijin Techno Products' 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.
Teijin Techno Products' highly heat-resistant aramid nanofiber sheet maintains its shape even at 300°C. It is also highly resistant to oxidation. Such features are expected to enhance the safety of high-power, high-capacity, energy-dense LIBs for vehicles and stationary storage, offering significant advantages over conventional separators in terms of reducing the risk of ignition in high-capacity, energy-dense applications.
Other features that Teijin Techno Products expects to achieve with aramid nanofiber nonwoven sheet for battery separators include:
- High porosity promotes smooth mobility of the electrolyte, resulting in higher output and faster charging.
- Large surface area, a feature of nanofibers, as well as high porosity, hold the electrolyte effectively to maintain battery performance at low temperatures, when ion conductivity drops.
- As a nonwoven sheet, absorbs electrolyte 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.
Teijinconex® aramid nanofiber separator
Teijin Techno Products expects to develop other applications for its thin, heat-resistant aramid nanofiber sheet, such as separators for capacitors; high-performance, heat-resistant filters; and heat-resistant cleaners for office automation equipment.
The Teijin Group has also developed two types of separators based on porous polyethylene film, one coated with a fluorine-based compound for high heat-resistance and adhesion to polymer electrolyte, and the other coated with Teijinconex® meta-aramid for excellent heat-resistance and dimensional stability, both of which will be commercialized in June under the Lielsort™ brand. The addition of aramid nanofiber sheet will further strengthen Teijin's presence in the high-end LIB separator market.
Posted on May 8, 2012
Source: Teijin Group