Abstract
The graphene nanoflakes and olivine-type LiFe0.97Ni0.03PO4/C (LFNP3/C) samples have been synthesized as anode and cathode materials, respectively. Physicochemical characterization of the graphene nanoflakes and LFNP3/C material were studied using X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD patterns reveal the formation of the pure phase of both the synthesized samples. SEM micrographs disclose the formation of spherically shaped nanosized particles for LFNP3/C while graphene shows flake-type morphology. CR2032 half and full coin cells were assembled for electrochemical testing of the synthesized samples. Cyclic voltammetry (CV) results indicate that the graphene-based half-cells, i.e., GN1H and GN2H, possess reduction peak/plateau around 0.17 V while LFNP3/C cathode shows discharging voltage plateau at 3.4 V vs. Li/Li+. The discharge capacities were found to be 700, 900, and 153 mAhg−1 for GN1H, GN2H, and LFNP3/C half-cells vs. Li/Li+, respectively. Among full cells, LFPGN1F with γ = 0.75 (mass/capacity balancing factor) shows better charging/discharging profile at each C-rate as compared to LFPGN2F with γ = 0.55. LFPGN1F delivered an initial discharge capacity of around 154 mAhg−1 at 0.1C and even at a high discharge rate of 1C, it retained ~97% of the discharge capacity as compared to the initial cycle at the same rate.
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The authors are thankful to the SERB and FIST, Department of Science and Technology (DST), New Delhi, for the financial support to carry out this work under the project grants Nos.: SR/FTP/PS-039/2011 and SR/FST/PSI-164/2011(C), respectively.
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Saroha, R., Panwar, A.K., Farooq, A.R. et al. Synthesis and electrochemical characterization of graphene nanoflakes and LiFe0.97Ni0.03PO4/C for lithium-ion battery. Ionics 23, 2641–2650 (2017). https://doi.org/10.1007/s11581-017-2000-6
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DOI: https://doi.org/10.1007/s11581-017-2000-6