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Polymer gel combustion synthesis of LiFePO4/C composite as cathode material for Li-ion battery

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Abstract

LiFePO4/C has been synthesized by polymer gel combustion method. Of aniline monomer, 0.5 and 1.0 ml were used for the different amount of gel formation. The particle sizes of LiFePO4/C composites designated as lithium iron phosphate (0.5) (LFP(0.5)) and LFP(1.0) were estimated as ∼400 and ∼100 nm for the powders synthesized with 0.5 and 1.0 ml of monomers, respectively. The final particle size of the LiFePO4/C depends on the initial monomer content used in the synthesis process. Thicknesses of carbon coating on the particles of LFP(0.5) and LFP(1.0) powders, as revealed by TEM observation, are ∼3 and ∼7 nm, respectively. The sample LFP(1.0) delivers discharge capacities of 72 and 60 mAh g−1 which are higher than those of LFP(0.5) at fast discharging rates of 5 and 10 C. The higher rate capability of sample LFP(1.0) was due to small particle size, low charge transfer resistance, and higher Li+ diffusion coefficient as compared to LFP(0.5).

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Acknowledgments

The author Rajeev Sehrawat would like to acknowledge the financial support from the Council of Scientific Industrial and Research (CSIR), India.

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  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Rookee, 247667, India

    Rajeev Sehrawat & Anjan Sil

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  1. Rajeev Sehrawat
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Correspondence to Rajeev Sehrawat.

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Sehrawat, R., Sil, A. Polymer gel combustion synthesis of LiFePO4/C composite as cathode material for Li-ion battery. Ionics 21, 673–685 (2015). https://doi.org/10.1007/s11581-014-1229-6

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