High structural stability and rapid ion diffusion via in-situ-designed V₂O₅@V₂CT_x nanocomposites as LIBs anode materials

Vanadium pentoxide (V₂O₅) demonstrates considerable potential as an effective insert-type high-energy anode material for rechargeable lithium-ion batteries (LIBs). However, the process of lithiation in V₂O₅ anode presents a challenge due to low electronic and ionic conductivity, sluggish dynamics, and robust volume expansion during the charge/discharge process. V₂O₅@V₂CT_x nanocomposites are effectively fabricated through oxidation using a simple one-step hydrothermal method on V₂CT_x MXene at different temperatures to enhance their efficiency. The results show that the V₂O₅@V₂CT_x-180°C anode exhibits superior capacity and cycle stability compared to the synthesized materials. The V₂O₅@V₂CT_x-180 °C deliver an initial capacity of 741 mAh g⁻¹ and maintains a capacity of 519 mAh g⁻¹ at 500 g⁻¹ over 100 cycles. The reversible stability and high-rate capacity are attributed to the synergistic effect between V₂O₅ and highly conductive, multi-layered V₂CT_x. The high-conductivity V₂CT_x MXene is electrostatically well connected to V₂O₅ nanocuboids, enhancing the performance of V₂O₅@V₂CT_x.