Bifunctional Interphase with Target-Distributed Desolvation Sites and Directionally Depositional Ion Flux for Sustainable Zinc Anode

Angew Chem Int Ed Engl. 2023 Jun 19;62(25):e202304503. doi: 10.1002/anie.202304503. Epub 2023 May 5.

Abstract

Aqueous zinc batteries (AZBs) feature high safety and low cost, but intricate anodic side reactions and dendrite growth severely restrict their commercialization. Herein, ethylenediaminetetraacetic acid (EDTA) grafted metal organic framework (MOF-E) is proposed as a dually-functional anodic interphase for sustainable Zn anode. Specifically, the target-distributed EDTA serves as an ion-trapped tentacle to accelerate the desolvation and ionic transport by powerful chemical coordination, while the MOFs offer suitable ionic channels to induce oriented deposition. As a result, MOF-E interphase fundamentally suppresses side reactions and guides horizontally arranged Zn deposition with (002) preferred orientations. The Zn|MOF-E@Cu cell exhibits a markedly improved Coulombic efficiency of 99.7 % over 2500 cycles, and the MOF-E@Zn|KVOH (KV12 O30-y ⋅ nH2 O) cell yields a steady circulation of 5000 cycles@90.47 % at 8 A g-1 .

Keywords: Aqueous Zinc Batteries; Artificial Coating; Metal-Organic Frameworks; Reversibility; Zn Anode.

MeSH terms

  • Edetic Acid
  • Electric Power Supplies
  • Electrodes
  • Ion Transport
  • Metal-Organic Frameworks*
  • Zinc*

Substances

  • Zinc
  • Edetic Acid
  • Metal-Organic Frameworks