Cellulose-Acetate Coating by Integrating Ester Group with Zinc Salt for Dendrite-Free Zn Metal Anodes.
Cellulose-Acetate Coating by Integrating Ester Group with Zinc Salt for Dendrite-Free Zn Metal Anodes.
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DOI：
10.1002/smll.202203327
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发表时间：
2022-08
期刊：
影响因子：
13.3
通讯作者：
Xu Liu;Qigang Han;Qingxin Ma;Yuanhao Wang;Chung-Te Liu
中科院分区：
文献类型：
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作者：
Xu Liu;Qigang Han;Qingxin Ma;Yuanhao Wang;Chung-Te Liu
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，枝晶和水电解质中相应的副反应阻碍了它们在环境友好型储能领域的进一步发展。在此，在 Zn 阳极 (CAZ@Zn) 上构建了带有 Zn(CF3 SO3 )2 的离子亲和醋酸纤维素 (CA) 涂层。由于极性酯基（C-O）和锌盐（Zn2+）之间的络合作用，CAZ聚合物涂层增强了锌负极的亲水性并降低了界面电阻，允许Zn2+快速扩散并使锌在水性电解质中沉积均匀，从而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-2和1 mAh cm-2下实现了超过2800小时的可逆电镀/剥离，大约比裸锌高七倍。采用优化的锌阳极和 NH4 V4 O10 阴极制造的全电池实现了基本稳定的性能，优于裸锌。这项工作提供了一种简单、有效且可扩展的方法来抑制水性锌离子电池的锌枝晶和相应的副反应。
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(CF3 SO3 )2 is constructed on Zn anode (CAZ@Zn). Owing to the complexation effect between the polar ester group (CO) and Zn salt (Zn2+ ), the CAZ polymer coating enhances the hydrophilicity of the Zn anode and reduces the interfacial resistance, allowing the rapid Zn2+ 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-2 with 1 mAh cm-2 , about sevenfold higher than bare Zn. The full cell fabricated with an optimized Zn anode and the NH4 V4 O10 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.