Composites comprising silicon (Si), graphite (C) and polyacrylonitrile based disordered carbon (PC), denoted as Si/C/PC, have been synthesized by thermal treatment of high energy mechanically milled silicon, graphite, and polyacrylonitrile (PAN) powder of nominal composition 42wt.%C-28wt.%Si-30wt.%PAN. The resultant Si/C/PC composite exhibits a 1st charge capacity of ∼1015mAh/g with a fade in capacity ∼0.31% per cycle when cycled at a rate of ∼160mA/g. In order to improve the cyclability of the Si/C/PC composite system, the alloying/dealloying behavior of lithium ion with silicon has been studied to minimize the volume expansion/contraction during electrochemical cycling, and accordingly changes in the alloy composition has been proposed to fulfill the requirements for practical application.
Alloy Design for Long Term Cyclability of Si Based Anode Materials for Lithium Ion Batteries
Sae Int. J. Mater. Manf
Sae International Journal of Materials and Manufacturing
SAE World Congress & Exhibition ; 2008
Sae International Journal of Materials and Manufacturing ; 1 , 1 ; 285-290
2008-04-14
6 pages
Conference paper
English
Alloy design for long term cyclability of Si based anode materials for lithium ion batteries
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