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        Improving electrochemical performance of LiMnPO_4 by Zn doping using a facile solid state method

        Yourong Wang,Yafang Chen,Siqing Cheng,Liangnian He 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3

        Olivine structure LiMnPO_4/C as cathode materials for Li-ion batteries were synthesized via a simple solidstate reaction. Improvement of the electrochemical performance of LiMnPO_4/C cathode material was realized significantly by the method of doping Zn. The obtained LiMn_(0.95)Zn_(0.05)PO_4/C electrode material was studied by the measurements of X-ray diffraction pattern, scanning electronic microscopy, electrochemical impedance spectroscopy and electrochemical performance. The results indicate that the LiMn_(0.95)Zn_(0.05)PO_4/C materials exhibit discharge specific capacity of 140.2 mA h g^(−1) at 0.02 C rate and better rate capability. These excellent results are elucidated by EIS test, which showed that there was the decrease of charge transfer resistance and faster lithium-ion diffusion in LiMnPO_4/C cathode materials after Zn doping.

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