By Russell Chianelli,The University of Texas at El Paso, Materials Research and Technology Institute
Separator materials for construction of batteries made from lithium metal and cathode materials have been crucial to successful construction and commercialization of these batteries. The separator material must be stable at higher temperatures and provide insulation. Polyimides (PI) are currently successful materials for this application, having long-term stability in temperature ranges from 200–30000C, along with other properties necessary for battery use.
A recent report1 describes a “Technological Update of Polyimide Nanofibers LiB Separator.” A PI separator material called Energain was developed by DuPont in 2010. DuPont’s process produces continuous filaments with diameters between 200 and 1000 nm and reported power increases of 15 to 30%. Improved battery life of up to 20% and improved safety features at higher temperatures were also reported.
Readers of this blog will be aware of safety issues in electric vehicles requiring better battery materials.
- *“Technology Update of Polyimide Nanofibers LiB Separator,” www.chemweek.com