Research Article

Nano Research

, Volume 4, Issue 3, pp 290-296

Hybrid silicon-carbon nanostructured composites as superior anodes for lithium ion batteries

  • Po-Chiang ChenAffiliated withMork Family Department of Chemical Engineering and Materials Science, University of Southern California
  • , Jing XuAffiliated withMork Family Department of Chemical Engineering and Materials Science, University of Southern California
  • , Haitian ChenAffiliated withMing-Hsieh Department of Electrical Engineering, University of Southern California
  • , Chongwu ZhouAffiliated withMing-Hsieh Department of Electrical Engineering, University of Southern California Email author 

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Abstract

We have successfully fabricated a hybrid silicon-carbon nanostructured composite with large area (about 25.5 in2) in a simple fashion using a conventional sputtering system. When used as the anode in lithium ion batteries, the uniformly deposited amorphous silicon (a-Si) works as the active material to store electrical energy, and the pre-coated carbon nanofibers (CNFs) serve as both the electron conducting pathway and a strain/stress relaxation layer for the sputtered a-Si layers during the intercalation process of lithium ions. As a result, the as-fabricated lithium ion batteries, with deposited a-Si thicknesses of 200 nm or 300 nm, not only exhibit a high specific capacity of >2000 mA·h/g, but also show a good capacity retention of over 80% and Coulombic efficiency of >98% after a large number of charge/discharge experiments. Our approach offers an efficient and scalable method to obtain silicon-carbon nanostructured composites for application in lithium ion batteries.
http://static-content.springer.com/image/art%3A10.1007%2Fs12274-010-0081-x/MediaObjects/12274_2010_81_Fig1_HTML.gif

Keywords

Amorphous silicon carbon nanofibers lithium ion batteries hybrid nanostructured composite