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Title: Preparation and characterization of LiNi0.5Co 0.5O2 and LiNi0.5Co0.4Al 0.1O2 by molten salt synthesis for Li ion batteries
Authors: Reddy, M.V. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Issue Date: 9-Aug-2007
Citation: Reddy, M.V., Subba Rao, G.V., Chowdari, B.V.R. (2007-08-09). Preparation and characterization of LiNi0.5Co 0.5O2 and LiNi0.5Co0.4Al 0.1O2 by molten salt synthesis for Li ion batteries. Journal of Physical Chemistry C 111 (31) : 11712-11720. ScholarBank@NUS Repository.
Abstract: The layer compounds LiNi0.5Co0.5O2 and LiNi0.5Co0.4Al0.1O2 were prepared by using the molten salt of the eutectic mixture LiNO3-LiCl at temperatures of 750 and 850°C in air. They were characterized by X-ray diffraction, Rietveld refinement, SEM, EDAX, chemical analysis, surface area, and density techniques. Cathodic behavior was examined at ambient temperature by cyclic voltammetry, charge-discharge cycling, and impedance spectra in cells with Li-metal as the counter electrode at a current rate of 30 mAg-1 with a lower cutoff voltage of 2.5 V up to 120 cycles. The upper cutoff voltages ranged from 4.2 to 4.5 V. The 10th cycle reversible capacities for LiNi 0.5Co0.5O2 varied from 131 to 186(±3) mAhg-1 depending on the upper cutoff voltage, but capacity fading occurred ranging from 5 to 18% at the end of 50 or 80 cycles. The Al-doped compound showed a 20th cycle reversible capacity of 146 (±3) mAhg -1 (4.3 V cutoff) which was stable up to 120 cycles. Good rate capability was also observed. Thus, LiNi0.5Co0.4Al 0.1O2 with only 0.4 mol of cobalt is a cheaper and viable alternative to the presently used cathode, LICoO2. Impedance spectra on cells cycled up to 60 cycles with 4.3 V cutoff have been analyzed and interpreted. © 2007 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp0676890
Appears in Collections:Staff Publications

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