Study on Mo-doped of Li1.18Ni1/3Co1/3Mn1/3O2 Lithium-rich Ternary Cathode Materials

Abstract

The layered Li1.18(Ni1/3Co1/3Mn1/3)1-xMoxO2 cathode material was prepared by mixing lithium carbonate with precursor-nickel cobalt manganese hydroxide complex which was prepared by co-precipitation method with Mo-doped. The physical and chemical parameters, crystal structure, morphology and electrochemical properties were investigated by ICP analysis, X-ray diffraction, SEM and electrochemical tests, respectively. XRD results showed that doping Mo had no effect on the structure of pristine materials. However, the second phase of Li2MoO4 was dissected until the Mo loading reached 4 at%. The SEM images exhibited that the primary particles size decreased with the increase of Mo loading. Electrochemical measurements showed that the high rate discharge capability and cycle stability of the material can be improved significantly by a small amount of Mo (2 at%). The sample with 2 at% Mo-doped amount exhibited a high initial discharge capacity of 146.3 mAh g-1 at 0.3C rate under the voltage range of 2.5∼4.2V, as well as better cycle stability after 50 cycles. Therefore, Mo-doped is a useful method to improve large current discharge capability of the lithium insertion nickel cobalt manganese oxides.