Open AccessA functionalized separator enables dendrite‐free Zn anode via metal‐polydopamine coordination chemistry
Author(s) -
Liu Yanfen,
Liu Shude,
Xie Xuesong,
Li Zhicheng,
Wang Pinji,
Lu Bingan,
Liang Shuquan,
Tang Yan,
Zhou Jiang
Publication year - 2023
Publication title -
infomat
Language(s) - English
Resource type - Journals
ISSN - 2567-3165
DOI - 10.1002/inf2.12374
Subject(s) - separator (oil production) , anode , chemical engineering , zinc , aqueous solution , ion , chemistry , materials science , electrochemistry , inorganic chemistry , organic chemistry , electrode , physics , engineering , thermodynamics
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 ZnO and ZnN 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 VO 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.