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Journal of Nanomaterials
Volume 2012 (2012), Article ID 743236, 7 pages
http://dx.doi.org/10.1155/2012/743236
Research Article

Surface Modification of LiMn2O4 for Lithium Batteries by Nanostructured LiFePO4 Phosphate

Department of Materials Engineering, Tarbiat Modares University, P.O. Box 4838-141, Tehran, Iran

Received 17 May 2012; Revised 31 August 2012; Accepted 31 August 2012

Academic Editor: Christian Brosseau

Copyright © 2012 B. Sadeghi 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

LiMn2O4 spinel cathode materials have been successfully synthesized by solid-state reaction. Surface of these particles was modified by nanostructured LiFePO4 via sol gel dip coating method. Synthesized products were characterized by thermally analyzed thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The results of electrochemical tests showed that the charge/discharge capacities improved and charge retention of battery enhanced. This improved electrochemical performance is caused by LiFePO4 phosphate layer on surfaces of LiMn2O4 cathode particles.