期刊
JOURNAL OF FLUORINE CHEMISTRY
卷 149, 期 -, 页码 88-94出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2013.01.038
关键词
LiFePO4; Fluorination; Discharge capacity; Impedance; Thermal stability
The electrochemical properties and thermal stability of carbon coated LiFePO4 cathode were improved by the surface fluorination using NF3 gas at a pressure less than 6.67 kPa at 25 degrees C. Especially, in case of F1-LiFePO4, the discharge capacity was about 10% higher than that of untreated LiFePO4. Also it indicated the lowest resistance (R-cr = 35.55 Omega) and largest exchange current density (i(o) = 0.72 mA) from the EIS results. However, in case of F2-LiFePO4, the electrochemical properties were negatively affected by the formation of some resistive fluoride films. In terms of thermal stability, the decomposition temperature (222.0 degrees C) of F1-LiFePO4 was 14 degrees C higher than that of untreated LiFePO4. Therefore, the surface fluorination led to the improvement of electrochemical properties and thermal stability of LiFePO4 as a promising cathode in high power lithium-ion cells for HEVs. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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