To improve the electrochemical performance of Li₃VO_4, a series of Li₃Nb_xV_1-xO₄ compounds are prepared via sol-gel method. The similar ionic radii of Nb⁵⁺ and V⁵⁺ in octahedral coordination make it possible to form single-phased Li₃Nb_xV_1-xO₄ (0 ≤ x ≤ 0.15). Theoretical calculations show that Li-ions migrate along the c-axis diffusion channel in a curved hopping route. The larger lattice constant caused by the substitution of V with Nb enhances the cross-sectional area, which indirectly provides a higher diffusion coefficient for Li-ion migration. Benefitting from high electronic conductivity (around two orders of magnitude) and good lithium-ion diffusion coefficient, the Li₃Nb_xV_1-xO₄ (x = 0.02) exhibits the best electrochemical property as an anode of LIBs in comparison to other Li₃Nb_xV_1-xO₄(x = 0, 0.01, 0.03, 0.04). At the current density of 30 mA g⁻¹, the charge capacity of pure Li₃VO₄ is around 440 mA h g⁻¹, whereas the Li₃Nb_xV_1-xO₄ (x = 0.02) shows a higher capacity of 550 mA h g⁻¹. Additionally, the charge/discharge capacities for Nb-doped samples are almost twice to those of the undoped Li₃VO₄ when the current density increases to1500 mA g⁻¹.

为了提高Li ₃ VO ₄的电化学性能，通过溶胶-凝胶法制备了一系列的Li ₃ Nb _x V _{1- x} O ₄化合物。Nb ⁵⁺和V ⁵⁺在八面体配位中具有相似的离子半径，因此可以形成单相Li ₃ Nb _x V _{1- x} O ₄（  0≤x ≤0.15）。理论计算表明，锂离子沿弯曲跳跃路径沿c轴扩散通道迁移。由N取代V所引起的较大晶格常数会增加横截面积，从而间接为锂离子迁移提供更高的扩散系数。得益于高电导率（大约两个数量级）和良好的锂离子扩散系数，Li ₃ Nb _x V _{1- x} O ₄（x  = 0.02）与其他LiBs阳极相比表现出最佳的电化学性能Li ₃ Nb _x V _{1- x} O ₄（x = 0、0.01、0.03、0.04）。在30 mA g ^-1的电流密度下，纯Li ₃ VO ₄的充电容量约为440 mA h g ^-1，而Li ₃ Nb _x V _{1- x} O ₄（x  = 0.02）显示出更高的容量。 550 mA汞^-1。此外，当电流密度增加到1500 mA g ^-1时，Nb掺杂样品的充电/放电容量几乎是未掺杂Li ₃ VO ₄的两倍。