Roll Forging Research Institute, School of Materials Science and Engineering (Key Laboratory of Automobile Materials, Ministry of Education), Jilin University, Changchun, 130022, P. R. China.
State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, 130022, P. R. China.
Small. 2022 Sep;18(39):e2203327. doi: 10.1002/smll.202203327. Epub 2022 Aug 26.
Zinc (Zn) metal is considered a potential anode owing to its high theoretical capacity, safety, and low cost. However, the dendrites and corresponding side reactions in aqueous electrolytes hinder their further development in environmentally-friendly energy storage. Herein, ion-affiliative cellulose acetate (CA) coating with Zn(CF SO ) is constructed on Zn anode (CAZ@Zn). Owing to the complexation effect between the polar ester group (CO) and Zn salt (Zn ), the CAZ polymer coating enhances the hydrophilicity of the Zn anode and reduces the interfacial resistance, allowing the rapid Zn diffusion and homogenizing the Zn deposition in an aqueous electrolyte to suppress zinc dendrite formation and growth. Therefore, the symmetric CAZ@Zn//CAZ@Zn battery achieves reversible plating/stripping over 2800 h at 1 mA cm with 1 mAh cm , about sevenfold higher than bare Zn. The full cell fabricated with an optimized Zn anode and the NH V O cathode achieves substantially stable performance, superior to that of bare Zn. This work provides a straightforward, effective, and scalable method to suppress the zinc dendrites and corresponding side reactions for aqueous Zn-ions batteries.
锌（Zn）金属因其高理论容量、安全性和低成本而被认为是一种潜在的阳极。然而，在水性电解液中，枝晶和相应的副反应阻碍了其在环保储能中的进一步发展。在此，通过在 Zn 阳极（CAZ@Zn）上构建带有 Zn(CF SO )的离子亲和性醋酸纤维素（CA）涂层，解决了这一问题。由于极性酯基（CO）和 Zn 盐（Zn ）之间的络合作用，CAZ 聚合物涂层提高了 Zn 阳极的亲水性，降低了界面电阻，从而允许 Zn 在水性电解质中快速扩散并均匀沉积，抑制锌枝晶的形成和生长。因此，对称的 CAZ@Zn//CAZ@Zn 电池在 1 mA cm 下以 1 mAh cm 的容量可逆循环 2800 小时以上，是裸 Zn 的约七倍。用优化的 Zn 阳极和 NH V O 阴极组装的全电池表现出优异的稳定性，优于裸 Zn。这项工作为抑制水性 Zn 离子电池中的锌枝晶和相应的副反应提供了一种简单、有效和可扩展的方法。
