Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China.
School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan, 243032, China.
Small. 2022 May;18(20):e2201045. doi: 10.1002/smll.202201045. Epub 2022 Apr 15.
The interface plays a pivotal role in stabilizing metal anode. Extensive studies have been made but systematic research is lacking. In this study, preliminary studies are conducted to explore the prime conditions of interfacial modification to approach the practical requirements. Critical factors including reaction kinetics, transport rate, and modulus are identified to affect the Zn anode morphology significantly. The fundamental principle to enhance the Zn anode stability is systematically studied using the TEMPO-oxidized cellulose nanofiber (TOCNF) coating layer with thin a separator. Its advantageous mechanical properties buffer the huge volume variation. The existence of hydrophilic TOCNF in the Zn anode interface enhances the mass transfer process and alters the Zn distribution with a record high double-layer capacitance (390 uF cm ). With the synergetic effect, the modified Zn anode works stably under 5 mA cm with a thin nonwoven paper as the separator (thickness 113 µm). At an ultra-high current density of 10 mA cm , this coated anode cycles for more than 300 h. This strategy shows an immense potential to drive the Zn anode forward toward practical applications.
界面在稳定金属阳极方面起着关键作用。虽然已经进行了广泛的研究，但系统的研究仍然缺乏。在这项研究中，我们进行了初步研究，以探索界面改性的基本条件，以满足实际需求。关键因素包括反应动力学、传输速率和模量，这些因素显著影响锌阳极的形态。通过使用带有薄分离器的 TEMPO 氧化纤维素纳米纤维 (TOCNF) 涂层来系统地研究增强锌阳极稳定性的基本原理。其有利的机械性能缓冲了巨大的体积变化。在锌阳极界面中存在亲水的 TOCNF 增强了传质过程，并改变了锌的分布，具有创纪录的高双层电容（390 μF cm）。在协同作用下，改性锌阳极在作为分离器的薄无纺纸（厚度 113 µm）下以 5 mA cm 的电流稳定工作。在超高电流密度 10 mA cm时，该涂层阳极循环超过 300 小时。该策略显示出巨大的潜力，可推动锌阳极向实际应用迈进。
