The development of metal ion-intercalated active materials for excellent electrochemical performance in rechargeable aqueous zinc-ion batteries (AZIBs) is challenging. The structure instability and intrinsic electrostatic repulsion of the lattice framework cause structural breakdown and low-rate performance. In response to these problems, yttrium vanadium oxide–poly(3,4-ethylenedioxythiophene) (PEDOT@YVO) composite is reported as stable cathode material for AZIBs. The introduction of PEDOT in YVO nanorods improves the crystalline structure with an enlarged interplanar lattice spacing of 3.4 Å. The PEDOT@YVO composite electrode demonstrates effective electric conductivity and a higher initial specific capacity of 308.5 mAh g⁻¹ than that (125.5 mAh g⁻¹) of the pure YVO at 0.2 C rate. It also features a long-term stable discharge–charge cycle performance of 4000 cycles with a capacity retention of 79.2% at 1C rate, better than YVO (29.4 mAh g⁻¹). The oxygen vacancies and improved electrical conductivity of the composite account for the invigorated electrochemical performance. Consequently, this work reveals another avenue for constructing unique electrodes to enhance the electrochemical properties of AZIBs.

中文翻译：

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水合锌离子电池用氧化钇-聚（3,4-亚乙基二氧噻吩）复合正极材料

为可充电水性锌离子电池（AZIBs）开发具有优异电化学性能的金属离子嵌入活性材料具有挑战性。晶格框架的结构不稳定性和内在静电排斥导致结构破坏和低倍率性能。针对这些问题，钇钒氧化物-聚（3,4-亚乙基二氧噻吩）（PEDOT@YVO）复合材料被报道为稳定的AZIBs正极材料。在 YVO 纳米棒中引入 PEDOT 改善了晶体结构，晶格间距增大了 3.4 Å。PEDOT@YVO 复合电极表现出有效的导电性和更高的初始比容量 308.5 mAh g ^-1比（125.5 mAh g ^-1) 在 0.2 C 倍率下的纯 YVO。它还具有4000次循环的长期稳定充放电循环性能，1C倍率下的容量保持率为79.2%，优于YVO（29.4 mAh g ^-1）。复合材料的氧空位和改善的导电性是增强电化学性能的原因。因此，这项工作揭示了构建独特电极以增强 AZIBs 电化学性能的另一种途径。