Facile synthesis of a new, highly stable lithium-ion battery dual-function electrode material, VNbO₅@KB

In this paper, we demonstrate that VNbO₅@KB can be synthesized via solid-state calcination and ball-milling methods. It can serve as both the anode and cathode materials for lithium-ion batteries. As an anode, it maintains a specific capacity of 355/356 mAh g^-1 after 300 cycles at a current density of 500 mA g^-1. As a cathode, it exhibits a specific capacity of 130/131 mAh g^-1 after 300 cycles at a current density of 500 mA g^-1. Additionally, the cycling performance of a full cell assembled with VNbO₅@KB//VNbO₅@KB at a current density of 100 mA g^-1 and a voltage range of 0.02-3 V shows that after 100 cycles, the charge/discharge capacity remains at 118.3/118.0 mAh g^-1. This result demonstrates that VNbO₅@KB can be utilized as an electrode material for lithium-ion batteries, exhibiting high stability and providing new insights into the positive and negative electrodes of lithium-ion batteries.