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

材料科学技术（英）, 2012, 28(9): 823-827.

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

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

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

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

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

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

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

基金项目: the Qianjiang Talents Project of Science Technology Depart- ment of Zhejiang Province, China(2011R10021) the Ph.D. Programs Foundation of Ministry of Education of China(20100101120024) Acknowledgements This work was supported by Zijin Program of Zhejiang University, China, the Fundamental Research Funds for the Central Universities(2010QNA4003) the National Natural Science Foundation of Chin the Foundation of Education Of- rice of Zhejiang Province, China(Y201016484)

关键词：纳米结构 , 回流法 , 制备 , 场发射扫描电子显微镜 , 循环伏安法 , 透射电子显微镜 , 主体材料 , 电化学性能

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

Keywords： LiFexMn1-xPO4 , Reflux method , Carbon coating , Cyclic voltammetry (CV) , Electrochemical impedance spectroscopy (EIS) ,

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 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, ac- celerating 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.

参考文献

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材料期刊网

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

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

参考文献