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Synthesis and electrochemical characterizations of nano-crystalline LiFePO4 and Mg-doped LiFePO4 cathode materials for rechargeable lithium-ion batteries

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Abstract

Nano-crystalline LiFePO4 and LiMg0.05Fe0.95PO4 cathode materials were synthesized by sol–gel method in argon atmosphere using succinic acid as a chelating agent. Physico-chemical characterizations were done by thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy, transmittance electron microscopy, and Raman spectroscopy. Electrochemical behavior of the cathode materials were analyzed using cyclic voltammetry, and galvanostatic charge/discharge cycling studies were employed to characterize the reaction of lithium-ion insertion into and extraction from virginal and magnesium-doped LiFePO4, in the voltage range 2.5 to 4.5 V (Vs Li/Li+) using 1 M LiPF6 with 1:1 ratio of ethylene carbonate and dimethyl carbonate as electrolytes. LiMg0.05Fe0.95PO4 exhibits initial charge and discharge capacities of 159 and 141 mAh/g at 0.2 C rate respectively, as compared to 121 and 107 mAh/g of pristine LiFePO4. Furthermore, LiMg0.05Fe0.95PO4 has retained more than 89% of the capacity even after 60 cycles. Hence, LiMg0.05Fe0.95PO4 is a promising cathode material for rechargeable lithium-ion batteries.

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Authors and Affiliations

  1. Advanced Lithium-Ion Battery Research Lab, Department of Industrial Chemistry, Alagappa University, Karaikudi, 630 003, India

    D. Arumugam, G. Paruthimal Kalaignan & P. Manisankar

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  1. D. Arumugam
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  2. G. Paruthimal Kalaignan
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  3. P. Manisankar
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Correspondence to G. Paruthimal Kalaignan.

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Arumugam, D., Paruthimal Kalaignan, G. & Manisankar, P. Synthesis and electrochemical characterizations of nano-crystalline LiFePO4 and Mg-doped LiFePO4 cathode materials for rechargeable lithium-ion batteries. J Solid State Electrochem 13, 301–307 (2009). https://doi.org/10.1007/s10008-008-0533-3

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  • DOI: https://doi.org/10.1007/s10008-008-0533-3

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