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Advances in Materials Science and Engineering
Volume 2014, Article ID 746341, 7 pages
http://dx.doi.org/10.1155/2014/746341
Research Article

Synthesis and Characterization of ( ) Cathode Materials for Lithium-Ion Batteries Prepared by a Sol-Gel Method

College of Chemistry and Material Engineering, Jiangnan University, Wuxi 214122, China

Received 29 May 2013; Accepted 13 November 2013; Published 17 February 2014

Academic Editor: Wen-Hua Sun

Copyright © 2014 Hailang Zhang. 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

Prospective cathode materials ( ) for a lithium-ion secondary battery were synthesized using a sol-gel method. The structural and electrochemical properties were examined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry(CV), and charge-discharge tests. The results show that the maintains the α-NaFeO2 type layered structure regardless of the magnesium content in the range . On the other hand, Mg-doping improves the capacity retention well. Besides, the Mg-doping promotes the diffusion of Li+ in LiNi0.7Co0.3O2. Moreover, Mg-doping suppresses the phase transitions that usually occur in LiNiO2 during cycling and improves the charge-discharge reversibility of Li/LiNi0.7Co0.3O2. High temperature cycling performance of the cathode at 55.5°C is also improved by Mg-doping, which is possibly attributed to the total stronger metal-oxygen bonding and the enhanced structure stability of those delithiated Mg-doped cathodes during cycling.