Synthesis and Electrochemical Properties of LiNi0.5Mn0.5O2 Cathode Materials by a Carbonate Co-Precipitation Method
The layered LiNi0.5Mn0.5O2 used as a cathode material for lithium-ion batteries was synthesized from precursor Ni0.5Mn0.5CO3 prepared via a carbonate co-precipitation method. The precursor Ni0.5Mn0.5CO3 was synthesized by the addition of KHCO3 to an aqueous solution of Ni, Mn sulphates. The powder LiNi0.5Mn0.5O2 was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Spherical LiNi0.5Mn0.5O2 with well development layered structure was obtained by the carbonate co-precipitation method. The LiNi0.5Mn0.5O2 samples adopted the α-NaFeO2 structure with a space group R-3m. Galvanostatic charge-discharge behavior of the LiNi0.5Mn0.5O2 cathodes delivered a initial charge and discharge capacity of 144.4 mAh/g and 140.2 mAh/g, respectively in the voltage range 2.5-4.5V at a discharge rate of 0.02A/g. The capacity showed no dramatic capacity fading during 50 cycles.
Weiguo Pan, Jianxing Ren and Yongguang Li
Z. Y. Yu et al., "Synthesis and Electrochemical Properties of LiNi0.5Mn0.5O2 Cathode Materials by a Carbonate Co-Precipitation Method", Advanced Materials Research, Vols. 347-353, pp. 3497-3500, 2012