Abstract
Quaternary oxides of compositions LiNiyCo1−yO2 (y=0.0, 0.1, 0.2, 0.3 and 0.4) were synthesized using a solid-state route from carbonate precursors. Material characterization was carried out using XRD, FTIR and particle size analyses. The formation patterns of the products are discussed from TG-DTA results. Nickel-rich compositions gave higher discharge capacities and smaller hysteresis in the charge–discharge cycling profiles which make them more attractive candidates than the unsubstituted LiCoO2 for use in high energy lithium-ion cells. However, the lower loss in capacity per cycle for cells with LiCoO2, as determined from charge–discharge studies up to 25 cycles, makes them more suitable than the substituted oxides for long cycle-life cells with low fade.
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