V₂O₅ is a promising candidate for cathode active material for Li-ion batteries due to its high theoretical specific capacity but suffers from poor rate capability and cycling stability. To cover these disadvantages, in this work, a low-cost and facile sol-gel method to prepare TiO₂-coated V₂O₅ microspheres is developed for the first time. The prepared V₂O₅@TiO₂ composite could deliver an initial capacity of 297.7 mAh g⁻¹ at a current density of 100 mA g⁻¹ in the potential range of 2.0–4.0 V (vs. Li⁺/Li). Moreover, the capacity of 247.0 mA h g⁻¹ could be delivered at 1000 mA g⁻¹, and 86% of capacity could be retained after 100 cycles. Even at a large current density of 5000 mA g⁻¹, it could still deliver a high capacity of 197.3 mA h g⁻¹ with a capacity retention of 93.5% after 200 cycles. The outstanding rate and cycling stability of V₂O₅@TiO₂ composite indicate that it holds bright prospect for using as an excellent cathode material for rechargeable lithium batteries.

V ₂ O ₅由于其高的理论比容量而成为锂离子电池正极活性材料的有前途的候选者，但是其速率能力和循环稳定性差。为了克服这些缺点，在这项工作中，首次开发了一种低成本，简便的溶胶-凝胶法来制备TiO ₂包覆的V ₂ O ₅微球。制备的V ₂ O ₅ @TiO ₂复合材料在2.0–4.0 V（vs。Li ⁺ / Li）的电势范围内，在100 mA g ^-1的电流密度下可以提供297.7 mAh g ^-1的初始容量。此外，容量为247.0 mA h g^-1可以1000 mA g ^-1的速率输送，并且100次循环后可以保留86％的容量。即使在5000 mA g ^-1的大电流密度下，它在200个循环后仍可提供197.3 mA h g ^-1的高容量，容量保持率为93.5％。V ₂ O ₅ @TiO ₂复合材料的优异的速率和循环稳定性表明，其用作可再充电锂电池的优良正极材料具有广阔的前景。