A functionalized separator enables dendrite‐free Zn anode via metal‐polydopamine coordination chemistry

作者：Yanfen Liu, Shude Liu, Xuesong Xie, Zhicheng Li, Pinji Wang, Bingan Lu, Shuquan Liang, Yan Tang, Jiang Zhou · 发表于：InfoMat · 年份：2022 · DOI：10.1002/inf2.12374 · 被引用次数：254 · 研究领域：Advanced battery technologies research、Advanced Battery Materials and Technologies、Supercapacitor Materials and Fabrication

Abstract Designing a multifunctional separator with abundant ion migration paths is crucial for tuning the ion transport in rocking‐chair‐type batteries. Herein, a polydopamine‐functionalized PVDF (PVDF@PDA) nanofibrous membrane is designed to serve as a separator for aqueous zinc‐ion batteries (AZIBs). The functional groups (OH and NH) in PDA facilitate the formation of ZnO and ZnN coordination bonds with Zn ions, homogenizing the Zn‐ion flux and thus enabling dendrite‐free Zn deposition. Moreover, the PVDF@PDA separator effectively inhibits the shuttling of V‐species through the formation of VO coordination bonds. As a result, the Zn/NH 4 V 4 O 10 battery with the PVDF@PDA separator exhibits enhanced cycling stability (92.3% after 1000 cycles at 5 A g −1 ) and rate capability compared to that using a glass fiber separator. This work provides a new avenue to design functionalized separators for high‐performance AZIBs. image