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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 2    April 2007

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Influence of Ti4+ doping on electrochemical
properties of LiFePO4/C cathode material for
lithium-ion batteries
HU Guo-rong(胡国荣), GAO Xu-guang(高旭光), PENG Zhong-dong(彭忠东),
DU Ke(杜 柯), TAN Xian-yan(谭显艳), Liu Yan-jun(刘艳君)

School of Metallurgical Science and Engineering, Central South University,
Changsha 410083, China

Abstract: To improve the performance of LiFePO4, single phase Li1−4xTixFePO4/C (x=0, 0.005, 0.010, 0.015) cathodes were synthesized by solid-state method. A certain content of glucose was used as carbon precursor and content of carbon in every final product was about 3.5%. The samples were characterized by X-ray diffraction(XRD), scanning electron microscopy observations(SEM), charge/discharge test, carbon analysis and electrochemical impedance spectroscopy(EIS). The results indicate that the prepared samples have ordered olivine structure and doping of the low concentration Ti4+ does not affect the structure of the samples. The electrochemical capabilities evaluated by charge-discharge test show that the sample with 1% Ti4+ (molar fraction) has good electrochemical performance delivering about an initial specific capacity of 146.7 mA∙h/g at 0.3C rate. Electrochemical impedance spectroscopy measurement results show that the charge transfer resistance of the sample could be decreased greatly by doping an appropriate amount Ti4+.

 

Key words: Li-ion battery; cathode material; doping; LiFePO4; Ti4+

ISSN 1672-7029
CN 43-1423/U

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