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http://dx.doi.org/10.5229/JECST.2012.15.2.95

Synthesis and Electrochemical Properties of Li[Fe0.9Mn0.1]PO4 Nanofibers as Cathode Material for Lithium Ion Battery by Electrospinning Method  

Kim, Cheong (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Kang, Chung-Soo (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Son, Jong-Tae (Department of Nano Polymer Science & Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korean Electrochemical Society / v.15, no.2, 2012 , pp. 95-100 More about this Journal
Abstract
$LiFePO_4$ is an attractive cathode material due to its low cost, good cyclability and safety. But it has low ionic conductivity and working voltage impose a limitation on its application for commercial products. In order to solve these problems, the iron($Fe^{2+}$)site in $LiFePO_4$ can be substituted with other transition metal ions such as $Mn^{2+}$ in pursuance of increase the working voltage. Also, reducing the size of electrode materials to nanometer scale can improve the power density because of a larger electrode-electrolyte contact area and shorter diffusion lengths for Li ions in crystals. Therefore, we chose electrospinning as a general method to prepare $Li[Fe_{0.9}Mn_{0.1}]PO_4$ to increase the surface area. Also, there have been very a few reports on the synthesis of cathode materials by electrospinning method for Lithium ion batteries. The morphology and nanostructure of the obtained $Li[Fe_{0.9}Mn_{0.1}]PO_4$ nanofibers were characterized using scanning electron microscopy(SEM). X-ray diffraction(XRD) measurements were also carried out in order to determine the structure of $Li[Fe_{0.9}Mn_{0.1}]PO_4$ nanofibers. Electrochemical properties of $Li[Fe_{0.9}Mn_{0.1}]PO_4$ were investigated with charge/discharge measurements, electrochemical impedance spectroscopy measurements(EIS).
Keywords
Lithium ion battery; $Li[Fe_xMn_{1-x}]PO_4$; Electrospinning; Nano fiber; Cathode material;
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