Zhang Yubai, Qin Jiadong, Batmunkh Munkhbayar, Li Wei, Fu Huaiqin, Wang Liang, Al-Mamun Mohammad, Qi Dongchen, Liu Porun, Zhang Shanqing, Zhong Yu Lin
Centre for Catalysis and Clean Energy, School of Environment and Science, Gold Coast Campus, Griffith University, Gold Coast, Queensland, 4222, Australia.
School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland, 4001, Australia.
Small. 2022 Mar;18(10):e2105761. doi: 10.1002/smll.202105761. Epub 2022 Jan 13.
Rechargeable aqueous zinc-ion batteries (ZIBs) are promising in stationary grid energy storage due to their advantages in safety and cost-effectiveness, and the search for competent cathode materials is one core task in the development of ZIBs. Herein, the authors design a 2D heterostructure combining amorphous vanadium pentoxide and electrochemically produced graphene oxide (EGO) using a fast and scalable spray drying technique. The unique 2D heterostructured xerogel is achieved by controlling the concentration of EGO in the precursor solution. Driven by the improved electrochemical kinetics, the resultant xerogel can deliver an excellent rate capability (334 mAh g at 5 A g ) as well as a high specific capacity (462 mAh g at 0.2 A g ) as the cathode material in ZIB. It is also shown that the coin cell constructed based on spray-dried xerogel can output steady, high energy densities over a broad power density window. This work provides a scalable and cost-effective approach for making high performance electrode materials from cheap sources through existing industrialized materials processing.
可充电水系锌离子电池（ZIBs）因其在安全性和成本效益方面的优势，在固定电网储能领域颇具前景，而寻找合适的正极材料是ZIBs发展的一项核心任务。在此，作者采用快速且可扩展的喷雾干燥技术，设计了一种由非晶态五氧化二钒和电化学制备的氧化石墨烯（EGO）组成的二维异质结构。通过控制前驱体溶液中EGO的浓度，获得了独特的二维异质结构干凝胶。受改善的电化学动力学驱动，所得干凝胶作为ZIB中的正极材料，可展现出优异的倍率性能（在5 A g时为334 mAh g）以及高比容量（在0.2 A g时为462 mAh g）。研究还表明，基于喷雾干燥干凝胶构建的扣式电池能够在较宽的功率密度窗口内输出稳定的高能量密度。这项工作提供了一种可扩展且具有成本效益的方法，通过现有的工业化材料加工手段，从廉价原料制备高性能电极材料。
