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Enhanced conductivity and electrical relaxation studies of carbon-coated LiMnPO4 nanorods

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Abstract

Lithium manganese phosphate (LiMnPO4) nanorods were synthesized using the modified polyol method. Polyvinylpyrrolidone was used as a stabilizer to control the shape and size of LiMnPO4 nanorods. Resin coating process was used to coat the carbon over the LiMnPO4 nanorods. X-ray diffraction and Fourier transform infrared spectroscopy results showed the formation of LiMnPO4 crystalline phase. The TEM image shows a uniform coating of the nano size (2.3 nm) carbon over the surface of LiMnPO4 nanorods and the EDS spectrum of the carbon-coated LiMnPO4 nanorods confirming the presence of carbon element along with the other Mn, P, and O elements. Impedance measurements were made on pure and carbon-coated LiMnPO4 nanorods, and their conductivities were evaluated by analyzing the measured impedance data using the WinFIT software. More than two orders of magnitude of conductivity enhancement was observed in the carbon-coated LiMnPO4 nanorods compared to pure ones, and the conductivity enhancement may be attributed to the presence of carbon over LiMnPO4 nanorods. Temperature dependence of conductivity and ac conductivity were calculated using impedance data of pure and carbon-coated LiMnPO4 nanorods. CR2032 type lithium ion coin cells were fabricated using pure and carbon-coated LiMnPO4 nanorods and characterized by measuring charge–discharge cycles between 2.9 and 4.5 V at room temperature. More than 25 % of improved capacity was achieved in the carbon-coated LiMnPO4 nanorods when compared to pure ones synthesized using modified polyol and resin coating processes.

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Acknowledgments

NS gratefully acknowledges DST, CSIR, UGC, DRDO and AICTE, Govt. of India, for providing financial support in the form of research projects. The authors are also grateful for the financial support from the Natural Sciences and Engineering Research Council (NSERC), Canada for the Discovery grant individual to MM, The Canadian Bureau for International Education, on behalf of Foreign Affairs and International Trade, Canada (DFAIT) for providing Graduate Student Exchange Program (GSEP) fellowship to RP.

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Authors and Affiliations

  1. Department of Physics, Pondicherry University, Pondicherry, 605014, India

    P. Ramesh Kumar & N. Satyanarayana

  2. R&D, Amara Raja Batteries, Tirupati, A.P., 517 520, India

    M. Venkateswarlu

  3. School of Engineering, University of Guelph, Guelph, ON, N1G2W1, Canada

    P. Ramesh Kumar, Manjusri Misra & Amar K. Mohanty

  4. Bioproducts Discovery & Development Center, University of Guelph, Guelph, ON, N1G 2W1, Canada

    Manjusri Misra, Amar K. Mohanty & N. Satyanarayana

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  1. P. Ramesh Kumar
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  2. M. Venkateswarlu
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  3. Manjusri Misra
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  4. Amar K. Mohanty
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  5. N. Satyanarayana
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Correspondence to N. Satyanarayana.

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Kumar, P.R., Venkateswarlu, M., Misra, M. et al. Enhanced conductivity and electrical relaxation studies of carbon-coated LiMnPO4 nanorods. Ionics 19, 461–469 (2013). https://doi.org/10.1007/s11581-012-0778-9

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  • DOI: https://doi.org/10.1007/s11581-012-0778-9

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