Preparation of Nano-structured LiFexMn1-xPO4 (x=0, 0.2, 0.4) by Reflux Method and Research on the Influences of Fe(II) Substitution

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (9): 823-827.

• Materials for Sustainable Energy • Previous Articles Next Articles

Preparation of Nano-structured LiFe_xMn_1-xPO₄ (x=0, 0.2, 0.4) by Reflux Method and Research on the Influences of Fe(II) Substitution

Zhao Yang, Hongming Yu, Chunyang Wu, Gaoshao Cao, Jian Xie, Xinbing Zhao

Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received:2011-09-28 Revised:2011-12-14 Online:2012-09-28 Published:2012-09-28
Contact: Xinbing Zhao
Supported by:
Zijin Program of Zhejiang University, China, the Fundamental Research Funds for the Central Universities (No. 2010QNA4003), the Ph.D. Programs Foundation of Ministry of Education of China (No. 20100101120024), the Foundation of Education Office of Zhejiang Province, China (No. Y201016484), the
Qianjiang Talents Project of Science Technology Department of Zhejiang Province, China (No. 2011R10021), and the National Natural Science Foundation of China (No. 51101139).

Abstract

Abstract:

Nano structured LiFe_xMn_1-xPO₄ (x=0, 0.2, 0.4) materials were successfully prepared by one-step reflux method in a water/PEG400 mixed solvent, and were coated by carbon using glucose as the precursor. The materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The electrochemical properties of the materials were investigated by galvanostatic cycling, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was found that the materials consisted of nanorods with a diameter of 50 nm and a length of 500 nm. Galvanostatic cycling showed that the capacity of LiMnPO₄ could be largely increased by Fe²⁺ substitution. At a current rate of C/20, the capacity of the three samples (x=0, 0.2, 0.4) were 47, 107 and 150 mA·h·g^-1, respectively. CV result showed that the Fe²⁺ substitution could decrease the polarization during charging/discharging, accelerating the electrochemical process. EIS result showed that the Fe²⁺ substitution could decrease the charge transfer resistance between the electrode and electrolyte, as well as increase the Li-ion diffusion coefficient in the bulk material, resulting in an improved electrochemical performance.

Key words: LiFe_xMn_1-_xPO₄, Reflux method, Carbon coating, Cyclic voltammetry (CV), Electrochemical impedance spectroscopy (EIS)

Zhao Yang, Hongming Yu, Chunyang Wu, Gaoshao Cao, Jian Xie, Xinbing Zhao. Preparation of Nano-structured LiFe_xMn_1-xPO₄ (x=0, 0.2, 0.4) by Reflux Method and Research on the Influences of Fe(II) Substitution[J]. J. Mater. Sci. Technol., 2012, 28(9): 823-827.

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Preparation of Nano-structured LiFe_xMn_1-xPO₄ (x=0, 0.2, 0.4) by Reflux Method and Research on the Influences of Fe(II) Substitution

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