Angstrom‐Level Ionic Sieve 2D‐MOF Membrane for High Power Aqueous Zinc Anode

Abstract

Aqueous Zn-ion energy-storage deviceswith metal Zn as anodes, including batteries and capacitors (ZIBs and ZICs), is largely hindered by dendritic growth and low coulombic efficiency since the side reactions between Zn anodes and electrolyte, originating fromthat targeted and efficient isolation of H 2 O and SO 4 2− is extremely challenging. Herein, inspired by density functional theory (DFT) that the 2D angstrom level metal-organic framework(2D-MOF) is highly selective for the passage of ions, simultaneously excluding the SO 4 2− and H2O but allowing Zn 2 + selective conduction. Moreover, 2D-MOF exhibits better mechanical strength compared with 3D-MOF, which is more conducive to inhibit dendrite growth. Impressively, benefiting from the 2D-MOFlayer, symmetric Zn cells survived up to 2000 h at 4 mA cm −2 ,near 20-times that of bare Zn anodes. Coupling it with cathode for ZICs and ZIBs, excellent electrochemical performances are presented. Importantly, symmetric Na cells with 2D-MOF as ionic sieve membrane also deliver small polarization and outstanding performance, indicating that this study provides an efficient strategy to develop long-life metal anode.

Manipulating Zn 002 deposition plane with zirconium ion crosslinked hydrogel electrolyte toward dendrite free Zn metal anodes

“…Moreover, the Zn metal surface with SFPAM provides uneven Zn deposition behaviors, proving the superiority of SFPAM-Zr in side reaction inhibition and Zn deposition regulation. 38 SEM images of the Zn metals after electrodeposition with different electrolytes are depicted in Fig. 2(c)–(f) and Fig.…”

Emerging application of 2D materials for dendrite-free metal batteries

“…As a result, superior stability of Li electroplating/stripping for 2000 h was achieved, suggesting good inhibition of dendrite formation and electrolyte consumption. Jiang et al [179] presented a straightforward approach to achieve anisotropic ordering of 2D COFs by depositing them onto graphene to form double-layer membranes as ionic sieves, which effectively suppressed the shuttle effect and demonstrated enhanced cyclability in Li-S batteries. Cao et al [180] have successfully developed a 2D Mn-MOF with angstrom-level ion tunnels that effectively suppress side reactions, leading to an ultra-long lifespan and high performance in zinc anodes, as well as demonstrating potential for other metal anodes.…”

A hydrophobic phenolic polymer layer with high-flux Zn2+-specific regular channels for stabilizing aqueous zinc anodes

“…31 An APL offers more flexibility in composition and structural design to meet specific functional goals. This includes the construction of zincophilic sites to guide Zn deposition, establishment of uniform electric fields, and disruption of the hydration layer equilibrium; 32–35 the utilization of the aperture effect to create ion channels and facilitate desolvation; 36–38 and implementation of charge repulsion to block anions. 39,40 We noticed that most efforts have focused on enhancing the hydrophilicity of the electrode.…”