Ion Sieve: Tailoring Zn2+Desolvation Kinetics and Flux toward Dendrite-Free Metallic Zinc Anodes

Shangqing Jiao, Jimin Fu, Mingzai Wu, Tao Hua, Haibo Hu, Mingzai Wu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

140 Citations (Scopus)

Abstract

Tip-induced dendrites on metallic zinc anodes (MZAs) fundamentally deteriorate the rechargeability of aqueous Zn metal batteries (ZMBs). Herein, an intriguing ion sieve (IS) consisting of 3D intertwined bacterial cellulose, deposited on the surface of MZAs (Zn@IS) through an in situ self-assembly route, is first presented to be effective in inhibiting dendrite-growth on MZAs. Experimental analyses together with theoretical calculations suggested that the IS coating can facilitate the desolvation of [Zn(H2O)6]2+ clusters via a strong interplay with Zn ions, weaken hydrogen evolution reaction of MZAs, and homogenize the ion flux with the abundant nanopores serving as ion tunnels, synergistically enabling dendrite-free Zn deposition on the Zn@IS anodes. Consequently, a lifespan up to 3000 h at a cutoff capacity of 0.25 mA h cm-2 was observed in a Zn@IS∥Zn@IS symmetric cell. In terms of application, pairing with a carbon-nanotube@MnO2 cathode as an example, the full ZMBs acquired enhanced rechargeability with much higher capacity retention over 73.3% after 3000 cycles compared to the counterpart with pristine MZA (21%).

Original languageEnglish
Pages (from-to)1013-1024
Number of pages12
JournalACS Nano
Volume16
Issue number1
DOIs
Publication statusPublished - 25 Jan 2022

Keywords

  • bacterial cellulose
  • desolvation kinetics
  • ion sieve
  • Zn dendrites
  • Zn metal battery

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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