EXPLORATION OF V2O5NANOROD@RGOHETEROSTRUCTURE AS POTENTIAL CATHODE MATERIAL FOR POTASSIUM-ION BATTERIES

Abstract

Potassium-ion batteries (KIBs) are considered as an alternative energy storage device for lithium-ion batteries (LIBs) owing to the low cost and earth abundant. Herein, first time we report the hydrothermally synthesized Bacilli rod shape V2O5 and making composite with reduced graphene oxide (rGO) for KIBs which greatly boosting the cycle durability and rate capability. Sheet-like materials (rGO) greatly enhance the performance of energy storage materials due to their high surface area which largely improves the electrochemical reaction kinetics. The heterostructure of V2O5 nanorods anchored on highly conductive rGO matrix not only enhance the reaction kinetics but also offer a more reactive surface area for potassium-ion storage resulting superior cycling stability. The V2O5@rGO exhibits a reversible capacity of 271 mAhg−1 and retains 80% initial discharge capacity after 500 cycles. It shows excellent rate capability and delivers 50 mAhg−1 even at the high current density of 2940 mAg−1 (10C). Ex-situ TEM and XRD analysis confirmed that the rod-shape with sheet like rGO morphology is retained after 500 cycles. The design of nanorod@sheet like architecture becomes a promising cathode candidate for high performance KIBs