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Synergistic effect of magnesium and fluorine doping on the electrochemical performance of lithium-manganese rich (LMR)-based Ni-Mn-Co-oxide (NMC) cathodes for lithium-ion batteries

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Abstract

Mg-doped-LMR-NMC (Li1.2Ni0.15-xMgxMn0.55Co0.1 O2) is synthesized by combustion method followed by fluorine doping by solid-state synthesis. In this approach, we substituted the Ni2+ by Mg2+ in varying mole percentages (x = 0.02, 0.05, 0.08) and partly oxygen by fluorine (LiF: LMR-NMC = 1:50 wt%). The synergistic effect of both magnesium and fluorine substitution on electrochemical performance of LMR-NMC is studied by electrochemical impedance spectroscopy and galvanostatic-charge-discharge cycling. Mg-F-doped LMR-NMC (Mg 0.02 mol) composite cathodes shows excellent discharge capacity of ~300 mAh g−1 at C/20 rate whereas pristine LMR-NMC shows the initial capacity around 250 mAh g−1 in the voltage range between 2.5 and 4.7 V. Mg-F-doped LMR-NMC shows lesser Ohmic and charge transfer resistance, cycles well, and delivers a stable high capacity of ~280 mAh g−1 at C/10 rate. The voltage decay which is the major issue of LMR-NMC is minimized in Mg-F-doped LMR-NMC compared to pristine LMR-NMC.

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Acknowledgments

SKK acknowledges the University Grant Commision, SG acknowledges MHRD for fellowship, and SKM acknowledges DST-SERB (Grant no. SB/FT/CS-147/2014) for the financial support for this research work.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, 502285, India

    S. Krishna Kumar, Sourav Ghosh & Surendra K. Martha

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  1. S. Krishna Kumar
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  2. Sourav Ghosh
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  3. Surendra K. Martha
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Correspondence to Surendra K. Martha.

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Krishna Kumar, S., Ghosh, S. & Martha, S.K. Synergistic effect of magnesium and fluorine doping on the electrochemical performance of lithium-manganese rich (LMR)-based Ni-Mn-Co-oxide (NMC) cathodes for lithium-ion batteries. Ionics 23, 1655–1662 (2017). https://doi.org/10.1007/s11581-017-2018-9

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  • DOI: https://doi.org/10.1007/s11581-017-2018-9

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