The Optimized Interfacial Compatibility of Metal–Organic Frameworks Enables a High-Performance Quasi-Solid Metal Battery

Abstract

Metal–organic frameworks (MOFs) have been attracting a great deal of attention as potential solid electrolytes (SEs). However, the interfacial compatibility of MOF-based SEs caused by the physical contact among MOF particles, the polymer binder, and electrodes is not yet fully determined. Herein, a bioinspired design strategy aiming to build ion transport pathways at interfaces was introduced. The MOF-to-MOF transport paths were built via in situ ring opening of epoxide, akin to the protein molecules that transport the ion across the cell walls. After optimization, the obtained SE is endowed with a high ion conductivity of 1.70 × 10–3 S cm–1 at 30 °C, a wide electrochemical window of 4.6 V, a high Li+ transference number of 0.8, and a decreased interface resistance. Consequently, the fabricated quasi-solid metal batteries exhibit higher and more stable cycling performance compared to the performance of those without interface optimization. This strategy for optimizing the interfacial compatibility of MOFs thus exploits a new avenue for developing high-performance SEs for various metal batteries.

Integration of Metal-Organic Frameworks into a 3D Interconnected Network for Improved Ion Transport

“…To apply MOFs as SEs in solid batteries, mixing MOFs with polymers is the most typical way to fabricate a exible SE membrane 23,33 . However, in this case, there is hardly chemical contact between MOF particles and thus the ion transport through the interface between MOF particles becomes challenging due to the lack of conductive medium.…”

Emergent electrochemical functions and future opportunities of hierarchically constructed metal–organic frameworks and covalent organic frameworks

“…As most 3D MOFs/COFs are electrical insulators and highly porous, it thus becomes desirable to design such structures for solid-state electrolytes. Although there are already several reports addressing the potential application of MOFs/COFs as the solid-state electrolyte, 26,151,157,158 the instability of these classes of materials at both the high/ low potentials versus Li + /Li should be solved for the practical battery applications to achieve a high energy density and a long cycling life, and the instability issue will be a grand challenge for MOFs/COFs (Fig. 7).…”

A Fluorescent Probe of Nitrite Based on Eu3+ Functionalized Metal‐Organic Frameworks

“…[11][12] Owing to the abundant features, MOFs materials have been widely explored in catalysis, chemical sensing, gas adsorption and luminescent materials. [13][14][15][16][17][18][19][20][21][22][23][24] Particularly, the intrinsic characteristics of high specific surface areas, devisable functionalities and defined crystal structures, of MOFs material endowed it great potential as fluorescence sensors. [15][16][17][18][19][20][21][22][23][24][25][26][27] There are various ways to for MOFs probes to introduce luminescence centers including metal ions, ligands and guest molecule, and the mechanism is explained as "antenna effect".…”

“…Metal‐organic frameworks (MOFs) were an emerging kind of porous crystal materials, composed of metal ions and organic ligands [11–12] . Owing to the abundant features, MOFs materials have been widely explored in catalysis, chemical sensing, gas adsorption and luminescent materials [13–24] . Particularly, the intrinsic characteristics of high specific surface areas, devisable functionalities and defined crystal structures, of MOFs material endowed it great potential as fluorescence sensors [15–27] .…”