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Journal of Nanomaterials
Volume 2014, Article ID 368071, 6 pages
http://dx.doi.org/10.1155/2014/368071
Research Article

Structural Evolution and Electrochemical Performance of Li2MnSiO4/C Nanocomposite as Cathode Material for Li-Ion Batteries

College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China

Received 11 November 2013; Accepted 4 December 2013; Published 19 January 2014

Academic Editor: Xiangyu Zhao

Copyright © 2014 Min Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

High capacity Li2MnSiO4/C nanocomposite with good rate performance was prepared via a facile sol-gel method using ascorbic acid as carbon source. It had a uniform distribution on particle size of approximately 20 nm and a thin outlayer of carbon. The galvanostatic charge-discharge measurement showed that the Li2MnSiO4/C electrode could deliver an initial discharge capacity of 257.1 mA h g−1 (corresponding to 1.56 Li+) at a current density of 10 mA g−1 at 30°C, while the Li2MnSiO4 electrode possessed a low capacity of 25.6 mA h g−1. Structural amorphization resulting from excessive extraction of Li+ during the first charge was the main reason for the drastic capacity fading. Controlling extraction of Li+ could inhibit the amorphization of Li2MnSiO4/C during the delithiation, contributing to a reversible structural change and good cycling performance.