| Preparation of Nano-structured LiFe_xMn_(1-x)PO_4(x=0,0.2,0.4) by Reflux Method and Research on the Influences of Fe(Ⅱ) Substitution |
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| 基金项目： | 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);the National Natural Science Foundation of China (No.51101139) |
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| 摘 要： | Nano structured LiFexMn1-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 LiMnPO 4 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,
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| 关 键 词： | LiFexMn1-xPO4 Reflux method Carbon coating Cyclic voltammetry (CV) Electrochemical impedance spectroscopy (EIS) |
| 收稿时间： | 2011-09-28 |
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