Vanadium-based materials are promising as cathodes for sodium-ion batteries owing to their superior cycling behavior and rate performance. However, there is a critical need for the rational implementation of Na⁺ intercalation to enhance the capacity. Herein, nano-Na₃V₂(PO₄)₂F₃ materials were synthesized via bulk dismemberment by gas released by the decomposition of excess citric acid to trigger some degree of lattice distortion and defects. Owing to the weakened electrostatic repulsion between sodium ions in Na₃V₂(PO₄)₂F₃ with an enlarged interlayer spacing, one more Na⁺ ion could be readily embedded to form Na₄V₂(PO₄)₂F₃. A new reaction plateau at 1.38 V/1.56 V accompanied the V³⁺/V²⁺ redox reaction, inducing a capacity of 250 mA h·g⁻¹, which is higher than that of highly crystallined Na₃V₂(PO₄)₂F₃. A noteworthy reversible redox phenomenon involving three sodium ions was confirmed during the cycling process. The nano-Na₃V₂(PO₄)₂F₃ electrode exhibited a capacity retention of 72% at 1.3–4.5 V after 20 cycles. Thus, this novel synthesis routine can provide vanadium-based cathode materials with enhanced Na⁺ intercalation properties, which can be applied to improve the capacity of sodium-ion batteries.

钒基材料因其出色的循环性能和倍率性能而有望用作钠离子电池的正极。但是，迫切需要合理实施Na ⁺嵌入以增强容量。在此，通过由过量柠檬酸分解而释放出的气体进行本体分解而合成纳米Na ₃ V ₂（PO ₄）₂ F ₃材料，从而引发一定程度的晶格畸变和缺陷。由于Na ₃ V ₂（PO ₄）₂ F _3中钠离子之间的静电排斥作用减弱随着层间间距的增大，一个或多个Na ⁺离子可以很容易地嵌入形成Na ₄ V ₂（PO ₄）₂ F ₃。V ³⁺ / V ²⁺氧化还原反应伴随着1.38 V / 1.56 V的新反应平台，产生了250 mA h·g ^-1的容量，高于高度结晶的Na ₃ V ₂（PO ₄）。₂ F ₃。在循环过程中，证实了涉及三个钠离子的值得注意的可逆氧化还原现象。纳米Na ₃ V ₂（PO ₄）₂ F ₃电极在20个循环后在1.3–4.5 V时表现出72％的容量保持率。因此，该新颖的合成程序可以提供具有增强的Na ⁺嵌入性质的钒基正极材料，其可以用于提高钠离子电池的容量。