The preparation and electrochemical properties of LiNi0.8Co0.15Al0.05O2 lithium ion batteries cathode material

Abstract:

In this article, the Ni0.8Co0.15Al0.05(OH)2 precursor was prepared by co-precipitation method, which AlO2- as Al source used. The precursor was processed at 500 oC, followed by mixing with excess LiOH?H2O and calcined at 700 oC for 12h under O2 atmosphere. Finally, LiNi0.8Co0.15Al0.05O2(NCA) materials have been synthesized. X-ray diffraction (XRD) showed that the NCA material is a typical α-NaFeO2 layered structure and belongs to the R-3m space group. According to scanning electron microscopy (SEM), they were uniform spheroidal particles with 5~6 μm diameters. The results of electrochemical tests showed that the first discharge capacity of NCA is 167.1 mAh/g at 0.1C rate, and the capacity retention rate is 96.2% after 200 cycles. Rate capacity test indicated that its capacity at 0.1C and 10C is 184.0 mAh/g, 112.7 mAh/g, respectively. When restored to 0.1C, the capacity can reach 179.7 mAh/g, and has a good rate performance.