MWCNT synergy for boosting the electrochemical kinetics of V2O5 cathode for lithium-ion batteries

Nanomaterial synergy in a hybrid system offers an unprecedented opportunity for the development of high-performance energy storage devices. In this work, to intrinsically boost the lithium storage properties of layered structure V2O5, hybrid systems involving V2O5/MWCNTs are synthesized and investigated as cathode materials for lithium-ion batteries. It is found that the V2O5/MWCNT electrode demonstrates a higher initial discharge capacity of 329 mA h g(-1) with a coulombic efficiency of 97% at 0.1C between 1.5 V and 4.2 V versus Li/Li+. The developed electrode delivers a reversible capacity of 217 mA h g(-1) at 0.1C after 100 cycles and 106 mA h g(-1) at 1C after 500 cycles with a capacity retention rate of 84.7% and 80.9% respectively. In addition, electrochemical impedance spectroscopy (EIS) and density functional theory (DFT) confirm the enhanced kinetics of the V2O5/MWCNT electrode. The improved and efficient performance of the electrode is due to the synergy between V2O5 and MWCNTs, which facilitates a convenient path for fast Li+ ion diffusion and reduces the strain generated during the charge/discharge process. This work suggests that the reported V2O5/MWCNT hybrid system can be utilized as a cathode for the construction of LIBs with high-rate capability and long cycle life.