期刊
NANO RESEARCH
卷 4, 期 3, 页码 290-296出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-010-0081-x
关键词
Amorphous silicon; carbon nanofibers; lithium ion batteries; hybrid nanostructured composite
类别
资金
- National Science Foundation [CCF 0726815, CCF 0702204]
We have successfully fabricated a hybrid silicon-carbon nanostructured composite with large area (about 25.5 in(2)) 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 center dot 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.
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