Cellulose‐Acetate Coating by Integrating Ester Group with Zinc Salt for Dendrite‐Free Zn Metal Anodes. Issue 39 (26th August 2022)

• Record Type: Journal Article
• Authors: Liu, Xu; Han, Qigang; Ma, Qingxin; Wang, Yuanhao; Liu, Chunguo
• Is Part Of: Small. Volume 18:Issue 39(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-26
• Subjects: cellulose acetate -- dendrite suppression -- ester groups -- zinc metal anodes; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202203327
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: 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 (CO) and Zn salt (Zn 2+ ), the CAZ polymer coating enhances the hydrophilicity of the Zn anode and reduces the interfacial resistance, allowing the rapid Zn 2+ 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. Abstract : Schematic diagrams of the dendrite formation process on Zn and CAZ@Zn. a) Dendrite growth, passive layer formation, H2 evolution, corrosion, and passive layer arise during the electrochemical deposition process on bare Zn surface in an aqueous electrolyte. b) The CAZ with high ionic conductivity can separate the Zn anode and aqueous, inhibiting passivation and corrosion and guaranteeing fast Zn 2+ diffusion and homogeneous electrochemical deposition without dendrite growth and H2 evolution.