Aqueous zinc-ions batteries (AZIBs) are expected to be a new green energy storage devices due to the low cost and safety. As classic cathode materials for AZIBs, layered vanadium oxides have excellent redox activity and large capacity performance. However, it not only has poor conductivity, but easily dissolved during (dis)charge process. Therefore, it is necessary to modify vanadium oxide to improve electrochemical performance in AZIBs. Herein, we successfully synthesized V₂O₃ with carbon shell (V₂O₃@C) by the reduction reaction of carbon with V₂O₅ in an oxygen-free environment and tested its electrochemical performance. By exploiting the effect of different calcination temperatures on the carbon reduction reaction, V₂O₃@C nanospheres with different carbon shell thicknesses were successfully synthesized. After fitting the experimental data, the calcination temperature for optimal electrochemical performance was determined to be 800 ℃ (VC-800). Detailly, the capacities of V₂O₃@C obtained at 700, 800 and 900 ℃ in the first 100 cycles at 0.5 A g^-1 were 454.5, 400.7 and 325.1 mAh g^-1, respectively. Furthermore, the obtained VC-800 showed 126% capacity retention after 10,000 cycles at 10 A g^-1. In the presence of carbon shell, V₂O₃ maintains the reversible redox valence characteristics while improving the conductivity and cycle life. This work may broaden ideas in improvement of vanadium-based materials for zinc ion storage.

水系锌离子电池（AZIBs）因其低成本和安全性而有望成为一种新型的绿色储能装置。作为AZIBs的经典正极材料，层状钒氧化物具有优异的氧化还原活性和大容量性能。然而，它不仅导电性差，而且在（放电）过程中容易溶解。因此，有必要对氧化钒进行改性以提高AZIBs的电化学性能。_{在此，我们通过碳与V 2} O ₅的还原反应成功合成了具有碳壳的V 2 O 3 (V ₂ O _{3 @C} ) _。在无氧环境中测试其电化学性能。利用不同煅烧温度对碳还原反应的影响，成功合成了不同碳壳厚度的V ₂ O _{3 @C纳米球。}拟合实验数据后，确定最佳电化学性能的煅烧温度为 800 ℃（VC-800）。^{详细地，在0.5 A g -1}的前100个循环中，在700、800和900 ℃下获得的V ₂ O ₃ @C的容量分别为454.5、400.7和325.1 mAh g ^-1。^{此外，获得的 VC-800 在 10 A g -1}下 10,000 次循环后显示出 126% 的容量保持率. 在碳壳的存在下，V ₂ O ₃保持了可逆的氧化还原价特性，同时提高了电导率和循环寿命。这项工作可能会拓宽改进用于锌离子存储的钒基材料的思路。