Abstract
Samples of LiNi 0.95- x Co x Al 0.05O 2 ( x = 0.10 and 0.15) and LiNiO 2, synthesized by the solid-state reaction at 725°C for 24 h from LiOH·H 2O, Ni 2O 3, Co 2O 3, and Al(OH) 3 under an oxygen stream, were characterized by TG-DTA, XRD, SEM, and electrochemical tests. Simultaneous doping of cobalt and aluminum at the Ni-site in LiNiO 2 was tried to improve the cathode performance for lithium-ion batteries. The results showed that co-doping (especially, 5 at.% Al and 10 at.% Co) definitely had a large beneficial effect in increasing the capacity (186.2 mA·h/g of the first discharge capacity for LiNi 0.85Co 0.10Al 0.05O 2) and cycling behavior (180.1 mA·h/g after 10 cycles for LiNi 0.85Co 0.10Al 0.05O 2) compared with 180.7 mA·h/g of the first discharge capacity and 157.7 mA·h/g of the tenth discharge capacity for LiNiO 2, respectively. Differential capacity versus voltage curves showed that the co-doped LiNi 0.95- x Co x Al 0.05O 2 had less intensity of the phase transitions than the pristine LiNiO 2
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