期刊
JOURNAL OF POWER SOURCES
卷 172, 期 2, 页码 913-918出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.05.013
关键词
LiFePO4/C composite; cathode material; Li-ion batteries; polyacrylates-pyrolysis
A carbon-coated nanocrystalline LiFePO4 cathode material was synthesized by pyrolysis of polyacrylate precursor containing Li+, Fe+ and PO4. The powder X-ray diffraction (XRD) and high-resolution TEM micrographs revealed that the LiFePO4/C composite as prepared has a core-shell structure with pure olivine LiFePO4 crystallites as cores and intimate carbon coating as a shell layer. Between the composite particulates, there exists a carbon matrix binding the nanocrystallites together into micrometer particles. The electrochemical measurements demonstrated that the LiFePO4/C composite with an appropriate carbon content can deliver a very high discharge capacity of 157 mAh g(-1) (>92% of the theoretical capacity of LiFePO4) with 95% of its initial capacity after 30 cycles. Since this preparation method uses less costly materials and operates in mild synthetic conditions, it may provide a feasible way for industrial production of the LiFePO4/C cathode materials for the lithium-ion batteries. (c) 2007 Published by Elsevier B.V.
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