Su Wanting, Lang Man, Li Weiwei, Li Huili
The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Chemistry and Materials Science, Shanghai Normal University Shanghai 200234 P. R. China
RSC Adv. 2024 Jul 17;14(31):22560-22568. doi: 10.1039/d4ra03730h. eCollection 2024 Jul 12.
V-based materials are considered promising candidates as cathode materials for zinc ion batteries (ZIBs). However, the inherent low conductivity of V-based compounds leads to the sluggish diffusion kinetics of Zn and serious cycling capacity degradation of ZIBs. Herein, 1D ZnVO(OH)·2HO (ZVO) nanowires were grown on monodisperse 2D TiCT MXene nanosheets a facile microwave-assisted method. The introduction of TiCT MXenes effectively improved the conductivity and hydrophilicity of ZVO. Furthermore, the Zn diffusion coefficient of ZVO/TiCT composites was enhanced to 10-10 cm s, which was superior to that of pure ZVO nanowires (10-10 cm s) and other previously reported typical V-based cathodes. The ZIBs based on the ZVO/TiCT cathode possessed an excellent discharge specific capacity of 215.2 mAh g at 0.1 A g and cycling stability (84% retention over 14 000 cycles at 10 A g). Moreover, the flexible Zn//ZVO/TiCT ZIBs using a gel electrolyte still exhibited good cycling stability and rate performance.
钒基材料被认为是锌离子电池（ZIBs）阴极材料的有前途的候选者。然而，钒基化合物固有的低导电性导致锌的扩散动力学缓慢以及锌离子电池的严重循环容量衰减。在此，通过一种简便的微波辅助方法在单分散的二维TiCT MXene纳米片上生长了一维ZnVO(OH)·2H₂O（ZVO）纳米线。TiCT MXene的引入有效地提高了ZVO的导电性和亲水性。此外，ZVO/TiCT复合材料的锌扩散系数提高到10⁻¹⁰ cm² s⁻¹，优于纯ZVO纳米线（10⁻¹¹ cm² s⁻¹）和其他先前报道的典型钒基阴极。基于ZVO/TiCT阴极的锌离子电池在0.1 A g⁻¹时具有215.2 mAh g⁻¹的优异放电比容量和循环稳定性（在10 A g⁻¹下14000次循环后保持84%）。此外，使用凝胶电解质的柔性Zn//ZVO/TiCT锌离子电池仍表现出良好的循环稳定性和倍率性能。
