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.

Automated summary

This study investigates the performance of a V2O5/MWCNT hybrid system as a cathode material for lithium-ion batteries. The hybrid system shows high initial discharge capacity and cycling performance, and electrochemical tests and theoretical analysis confirm the improved kinetics. This suggests that the hybrid system can be used for the construction of lithium-ion battery cathodes with high-rate capability and long cycle life.