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

Chen, Po-Chiang and Xu, Jing and Chen, Haitian and Zhou, Chongwu (2011) Hybrid silicon-carbon nanostructured composites as superior anodes for lithium ion batteries. Nano Research, 4 (3). pp. 290-296.

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Official URL: http://www.springerlink.com/content/33807w1pm66061...

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.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:10649
Deposited By:JNCASR
Deposited On:19 Mar 2011 06:19
Last Modified:19 Mar 2011 06:19

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