Zhang Yufen, Guo Rongyu, Wen Jinjin, Zhai Haonan, Chen Xifan, Peng Wenchao, Liu Jiapeng
School of Chemical Engineering and Technology, National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Hebei University of Technology, Tianjin 300130, China.
Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, China.
J Colloid Interface Sci. 2024 Jul;665:838-845. doi: 10.1016/j.jcis.2024.03.195. Epub 2024 Mar 29.
Currently, aqueous zinc ion batteries (AZIBs) have grown to be a good choice for large-scale energy storage systems due to their high theoretical specific capacity, low redox potential, low cost, and non-toxicity of the aqueous electrolyte. However, it is still challenging to obtain high specific capacity and stability suitable cathodes. Herein, hierarchical self-supporting potassium ammonium vanadate@MXene (KNVO@MXene) hybrid films were prepared by vacuum filtration method. Due to the three-dimensional nanoflower structure of KNVO with dual ions intercalation, high conductivity of two-dimensional TiCT MXene, and the hierarchical self-supporting structure, the AZIB based on the KNVO@MXene hybrid film cathode possessed superior specific capacity (481 mAh/g at 0.3 A/g) and cycling stability (retaining 125 mAh/g after 1000 cycles at a high current density of 10 A/g). In addition, the storage mechanism was revealed by various ex-situ characterizations. Hence, a new viewpoint for the preparation of AZIB self-supporting cathode materials is presented.
目前，水系锌离子电池（AZIBs）因其高理论比容量、低氧化还原电位、低成本以及水系电解质的无毒特性，已成为大规模储能系统的一个不错选择。然而，获得具有高比容量和稳定性的合适阴极仍然具有挑战性。在此，通过真空过滤法制备了分级自支撑钒酸钾铵@MXene（KNVO@MXene）复合薄膜。由于具有双离子插层的KNVO的三维纳米花结构、二维TiCT MXene的高导电性以及分级自支撑结构，基于KNVO@MXene复合薄膜阴极的水系锌离子电池具有优异的比容量（在0.3 A/g时为481 mAh/g）和循环稳定性（在10 A/g的高电流密度下1000次循环后保持125 mAh/g）。此外，通过各种非原位表征揭示了存储机制。因此，提出了一种制备水系锌离子电池自支撑阴极材料的新观点。
