Investigation of various cobalt concentrations on LiV_2O_5 as cathode materials with tunable high rate capability and operating voltage in Li-ion batteries

摘要

Li-ionbatteries discover its way in developing new electrodes with recent advancements. In regardless, the new electrode materials necessity is to fulfill the high voltage operation with high current rate for Li-ion batteries. Hence, LiCoxV2O5 (x = 0.1, 0.3 and 0.5) were synthesized by one pot hydrothermal synthesis followed by post calcination. The powder X-ray diffractometer explains the formation of LiCoxV2O5 (x = 0.1, 0.3 and 0.5) with more than two phases as the cobalt concentration increases with increased grain size. FE-SEM and HR-TEM studies of the as-synthesized materials shows the formation of sphere and rod like morphologies. Cyclic voltammograms reveal an excellent redox peaks for Co and V, the redox peaks were observed between 2.0 and 4.5 V. LiCo0.1V2O5 material delivered high reversible capacity of 147mAh/g especially at high current density as well as withstand stable discharge capacity up to 50 cycles. The charge-discharge cycling of LiCo0.1V2O5 cathode materials at various rates 0.5C, 1C, 2C, 3C and 4C delivered specific discharge capacities of 147mAh/g, 129mAh/g, 113mAh/g, 98mAh/g and 85mAh/g with 96% columbic efficiency. Also it shows the lower charge transfer resistance with less interfacial properties, which contributed to the improved rate capability with stable cycling. Thus this material serves as promising cathode material for rechargeable Li-ion batteries.