期刊
IONICS
卷 23, 期 2, 页码 377-384出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-016-1910-z
关键词
Lithium-ion battery; Cathode material; LiFePO4; Fe2O3; Carbon source
资金
- NSFC [21501071]
- China Postdoctoral Science Foundation [2014M561577, 2014M561572]
- Technology Innovation Fund of Science and Technology Enterprises in Jiangsu Province [BC2014206]
- Science and Technology Support Project in Jiangsu Province [BE2014008, BE2014008-2]
Carbon-coated olivine-structured LiFePO4/C composites are synthesized via an efficient and low-cost carbothermal reduction method using Fe2O3 as iron source at a relative low temperature (600 A degrees C). The effects of two kinds of carbon sources, inorganic (acetylene black) and organic (sucrose), on the structures, morphologies, and lithium storage properties of LiFePO4/C are evaluated in details. The particle size and distribution of the carbon-coated LiFePO4 from sucrose (LiFePO4/SUC) are more uniform than that obtained from acetylene black (LiFePO4/AB). Moreover, the LiFePO4/SUC nanocomposite shows superior electrochemical properties such as high discharge capacity of 156 mAh g(-1) at 0.1 C, excellent cyclic stability, and rate capability (78 mAh g(-1) at 20 C), as compared to LiFePO4/AB. Cyclic voltammetric test discloses that the Li-ion diffusion, the reversibility of lithium extraction/insertion, and electrical conductivity are significantly improved in LiFePO4/SUC composite. It is believed that olivine-structured LiFePO4 decorated with carbon from organic carbon source (sucrose) using Fe2O3 is a promising cathode for high-power lithium-ion batteries.
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