Synergistic effect of 3D electrode architecture and fluorine doping of Li 1.2 Ni 0.15 Mn 0.55 Co 0.1 O 2 for high energy density lithium-ion batteries

Krishna Kumar, S and Ghosh, S and Ghosal, P and Martha, Surendra Kumar (2017) Synergistic effect of 3D electrode architecture and fluorine doping of Li 1.2 Ni 0.15 Mn 0.55 Co 0.1 O 2 for high energy density lithium-ion batteries. Journal of Power Sources, 356. pp. 115-123. ISSN 0378-7753

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Abstract

Li1.2Ni0.15Mn0.55Co0.1O2 (LMR NMC) is synthesized by solution combustion method followed by LiF coating onto LMR NMC by solid state synthesis. The electrochemical performance of the pristine LMR NMC and corresponding F-doped samples as cathodes for Lithium ion Batteries (LIBs) are investigated by galvanostatic charge-discharge cycling and impedance spectroscopy. The fluorine doped cathodes deliver high capacity of 300 mAh g(-1) at C/10 rate (10-20% greater than the pristine LMR NMC cathodes), have high discharge voltage plateau (>0.25 V) and low charge voltage plateau (0.2-0.4 V) compared to pristine LMR NMC cathodes. Beside, irreversible capacity, voltage fade, capacity loss are significantly reduced in-relation to the pristine LMR NMC electrodes. LiF coating onto LMR NMC, partially replaces M-O bonds of the material by M-F bonds, thus increasing the interfacial and structural stability. Besides, the manuscript describes possible replacement of aluminium current collector with 3D carbon fiber current collector which delivers high capacity of >200 mAh g(-1) at 1C rate, good capacity retentions for over 200 cycles. The study opens a possibility for LMR NMC cathode material which has almost double the capacity of currently used cathodes, can be a possible substitute cathode for LIBs used in electric vehicles.

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