2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

Si-coated Carbon Fibre Nanocomposite Materials for Secondary Li-Ionbattery Anodes

M. Willert-Porada, T. Gerdes, H. Wolf
University of Bayreuth, DE

Si-C nanocomposite, Li-ion battery

The paper presents a new synthesis method for nanocomposites made from amorphous and nanocrystalline Silicon deposited on carbon fibre woven textile and the Li-ion battery performance results achieved with such nanocomposites. Anodes for Li-ion batteries made from the new material have the potential to significantly increase the reversible capacity of the battery. Li forms with Silicon alloys, which in comparison to carbon as intercalation material could store 10x as much Lithium. Unfortunately, the intercalation of Li into crystalline Si causes a complete restructuring of the lattice, therefore the material de-integrates completely and looses electrical contact to the metallic support structure. As a new approach, a multifunctional nanocomposite has been developed: electrical conductivity and percolation as well as mechanical stability is achieved by application of a carbon fibre textile as substrate. Atmospheric microwave plasma coating enables deposition of amorphous and nano-crystalline Silicon onto this substrate. Excellent adhesion of Si to this “electrical network” is observed, even upon multiple high speed, high load charging and re-charging, tested in a mini cell, with Li metals as cathode.

Nanotech 2008 Conference Program Abstract