期刊
ELECTROCHIMICA ACTA
卷 54, 期 28, 页码 7389-7395出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.07.071
关键词
LiFePO4; Fe2P; Cathode material; Lithium ion battery; Spray drying and carbothermal method
Spray drying and carbothermal method was employed to investigate reaction mechanism and electrochemical performance of LiFePO4/C cathode by using different carbon sources. Micro-structural variations of LiFePO4/C precursors using different carbon sources were studied by Thermo-gravimetric (TG)/Differential Thermal Analysis (DTA). The LiFePO4/C samples were characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) absorption spectroscopy. The results indicated that the crystallization temperature of LiFePO4 was 453 degrees C, while the transform temperature was 539 degrees C from Li3Fe2(PO4)(3) to LiFePO4. At 840 degrees C, LiFePO4/C sample with an excess of impurity phase Fe2P gave much poorer electrochemical performance. The severe decomposition of LiFePO4/C happened at 938 degrees C and generated impurity phases Li4P2O7 and Fe2P. The clear discharge platform of Fe2P emerged at around 2.2V. (C) 2009 Elsevier Ltd. All rights reserved.
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