As well-known, hydrated vanadium pentoxide (V₂O₅·nH₂O) has a larger layer spacing than orthogonal V₂O₅, which could offer more active sites to accommodate lithium ions, ensuring a high specific capacity. However, the exploration of V₂O₅·nH₂O cathode is limited by its inherently low conductivity and slow electrochemical kinetics, leading to a significant decrease in capability. Herein, we prepared V₂O₅·nH₂O/reduced graphene oxide (rGO) composite with low rGO content (8 wt%) via a simple yet effective dual electrostatic assembly strategy. When used as the cathode material for lithium-ion batteries (LIBs), V₂O₅·nH₂O/rGO manifests a high reversible capacity of 268 mAh g⁻¹ at 100 mA g⁻¹ and especially an excellent rate capability (196 mAh g⁻¹ at 1000 mA g⁻¹ and 129 mA h g⁻¹ at 2000 mA g⁻¹), surpassing those of the V₂O₅/carbon composites reported in the literatures. Notably, the remarkable performance should be referable to the synergetic effects between one-dimensional V₂O₅·nH₂O nanobelts and two-dimensional rGO nanosheets, which provide a short transport pathway and enhanced electrical conductivity. This strategy opens a new opportunity for designing high-performance cathode material with excellent rate performance for advanced LIBs.

众所周知，水合五氧化二钒（V ₂ O ₅ · n H ₂ O）的层间距比正交V ₂ O _5大，可以提供更多的活性位来容纳锂离子，从而确保高比容量。但是，对V ₂ O ₅ · n H ₂ O阴极的探索受到其固有的低电导率和缓慢的电化学动力学的限制，导致容量显着下降。在这里，我们准备了V ₂ O ₅ · n H ₂通过简单而有效的双重静电组装策略，具有低rGO含量（8 wt％）的O /还原氧化石墨烯（rGO）复合材料。当用作锂离子电池（LIB）的正极材料时，V ₂ O ₅ · n H ₂ O / rGO在100 mA g ^-1时表现出268 mAh g ^-1的高可逆容量，特别是出色的倍率能力（ 196毫安克^-1以1000mA克^-1和129毫安ħ克^-1在2000毫安克^-1），超过那些在V的₂ ø ₅/碳复合材料的文献报道。值得注意的是，这种非凡的性能应参考一维V ₂ O ₅ · n H ₂ O纳米带和二维rGO纳米片之间的协同作用，从而提供较短的传输路径和增强的电导率。该策略为设计用于高级LIB的优异速率性能的高性能阴极材料提供了新的机会。