期刊
ELECTROCHIMICA ACTA
卷 54, 期 20, 页码 4595-4599出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.03.063
关键词
LiFePO4/C; Lithium battery; High-density; Conductivity
资金
- Natural Science Foundation of China [20671031]
To achieve a high-energy-density lithium electrode, high-density LiFePO4/C composite cathode material for a lithium-ion battery was synthesized using self-produced high-density FePO4 as a precursor, glucose as a C source, and Li2CO3 as a Li source, in a pipe furnace under an atmosphere of 5% H-2-95% N-2. The structure of the synthesized material was analyzed and characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The electrochemical properties of the synthesized LiFePO4/carbon composite were investigated by cyclic voltammetry (CV) and the charge/discharge process. The tap-density of the synthesized LiFePO4/carbon composite powder with a carbon content of 7% reached 1.80 gm(-3). The charge/discharge tests show that the cathode material has initial charge/discharge capacities of 190.5 and 167.0mAh g(-1), respectively, with a volume capacity of 300.6 mAh cm(-3), at a 0.1C rate. At a rate of 5C, the LiFePO4/carbon composite shows a high discharge capacity of 98.3 mAh g(-1) and a volume capacity of 176.94 mAh cm(-3). (C) 2009 Elsevier Ltd. All rights reserved.
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