Journal
JOURNAL OF POWER SOURCES
Volume 204, Issue -, Pages 182-186Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.12.032
Keywords
Lithium iron phosphate; Natural graphite; Two-phase carbon; Electrochemical properties
Funding
- Natural Science Foundation of China (NSFC) [50972075]
- Chinese Ministry of Education [D209083]
- Excellent Youth Foundation of Hubei Scientific Committee [2011CDA093]
- Three Gorges University
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The electrochemical performance of LiFePO4/C samples synthesized by different carbon sources varies considerably, the structural difference of residual carbon in LiFePO4/C accounts for the performance variation. Higher performance is associated with a larger ratio of graphitic carbon, which exhibits better electronic conductivity than amorphous carbon. To improve the electronic conductivity, we prepared LiFePO4/(C+G) composites by a one-step solid-state method, in which natural graphite is used as reducing agent and conducting additives. The samples were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM). Raman microprobe spectroscope and other electrochemical methods. The results show that reversible capacity and rate performance of LiFePO4 are improved considerably by the two-phase carbon coating. Therefore, LiFePO4/(C+G) composites are a promising candidate for lithium ion batteries. (C) 2011 Elsevier B.V. All rights reserved.
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