Lithium battery separator materials advance*

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.

1. *“Technology Update of Polyimide Nanofibers LiB Separator,” www.chemweek.com

Comments

[Julio R]

Increasing the capacity and longevity of batteries is crucial for the development and feasibility of electric vehicles, which require safer, longer lasting, higher capacity batteries.
The inconvenience of carrying a 660 lb battery pack to achieve a bare 100 miles a charge is unacceptable, especially if you compare with a similar sized car for moving the same distance you require less then 20 lb of gasoline.
Achieving the
Being able to store the same capacity at a fraction of the weight and size will allow the electric vehicles to become a common everyday vehicle, rather then a eco statement from a eco friendly person who cannot travel more than 100 miles.

[car batteries site]

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