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Effects of ZnO Modification on the Electrochemical Performance of Fe1.5P

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Author(s): LI Xiu-Li, WANG Gui-Xin, YAN Kang-Ping, LIU Rui

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 8;
Start page: 877;
Date: 2010;
Original page

Keywords: ZnO; Fe1.5P; electrochemical performance; rheological phase method

ABSTRACT
ZnO-modified Fe1.5P powders were synthesized successfully via a rheological phase method. X-ray diffractometry (XRD) was utilized to analyze the composition. TEM was used to characterize the morphology. The effects of ZnO modification on the electrochemical performance of the Fe1.5P were investigated using constant current charge/discharge method, cyclic voltammogram, and electrochemical impedance spectrograph (EIS). The experimental results show that ZnO modification can enhance the rate performance of Fe1.5P. The first discharge capacity of the ZnO-modified Fe1.5P is 837.5mAh/g, and 69.7% higher than that of the pristine Fe1.5P. After 215 cycles, the discharge capacity of the Fe1.5P at 12C rate is increased to 144.3%. Furthermore, ZnO modification improve 330% of the recovery discharge capability of the Fe1.5P at 0.1C rate. In addition, in comparison with the pristine Fe1.5P, ZnO modification reduce 87.9% of the SEIingd  SEI film resistance RSEI, 87% of the charge transfer resistance Rd, and 13.2% of the Warburg impedance Wb from the diffusion of lithium ions, while can improve 86.6% of the diffusion efficiency of lithium ions.
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