Author： Zhao Hongxiao Jia Huimin Wang Shumin Xue Dengqi Zheng Zhi
Publisher： Taylor & Francis Ltd
ISSN： 1745-8080
Source： Journal of Experimental Nanoscience, Vol.6, Iss.1, 2011-02, pp. : 75-83
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Abstract
In this work, MFe2O4 (M = Zn, Cu) nanoparticles were successfully prepared by a hydrothermal method. The structure, morphology, microstructure, specific surface area and electrochemical properties of the resultant particles were characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen physical adsorption, charge-discharge test and cyclic voltammetry (CV) method, respectively. The resulting ZnFe2O4 and CuFe2O4 products were sphere-like and cubic-shaped particles and their average size was about 30-40 nm and 60-70 nm, respectively. The initial discharge capacities of ZnFe2O4 and CuFe2O4 electrodes reached 1287.5 mAh g-1 and 1412.3 mAh g-1, respectively, at a current density of 0.2 mA cm-2 in a potential range of 0.0-3.0 V. This indicated that Cu is a better counter ion than Zn. The resulting MFe2O4 nanoparticles are expected to be a promising candidate of anode materials for Li ion batteries. The reaction mechanism of MFe2O4 nanoparticles in Li ion batteries was also discussed based on the CV of Li/MFe2O4 cell.
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