Highly Stable Zn Anodes Modulated by Selenizing In Situ Grown Metal–Organic Frameworks

Abstract

The unsatisfactory cycling stability of Zn anode stemming from dendritic growth and side reactions has slowed the rapid development of aqueous Zn-ion batteries (AZIBs). Constructing a three-dimensional (3D) artificial interphase layer is an appealing solution since it could dictate Zn deposition at the interface. Here, the in situ growth of a Cu-based metal–organic framework (Cu-MOF) over commercial Zn foil followed by subsequent selenization endows selenized Cu-MOF (SCM) with a stabilized Zn anode. The 3D SCM coating could homogenize the electric field and function as a reservoir to tolerate the deposited Zn. As a result, both rampant dendritic propagation and the notorious side reactions are concurrently inhibited. The SCM@Zn symmetric cell displays an elongated cyclic life for over 500 h at 2.0 mA cm–2. The assembled AZIB full cell readily realizes high electrochemical reversibility under different current densities. Our investigation offers insights into the design of a protective layer for high-performance Zn anodes.

A Generic “Engraving in Aprotic Medium” Strategy toward Stabilized Zn Anodes

“…To demonstrate the prospects of HP‐Zn designed for practical applications, full ZMB cells were assembled by pairing the anode with ZVO and their electrochemical performances were comprehensively evaluated (Figure S33, Supporting Information). [ 38 ] CV curves of HP‐Zn||ZVO and bare Zn||ZVO were collected at 0.2 mV s −1 . As shown in Figure 5 a, HP‐Zn||ZVO exhibited smaller voltage polarization and larger current density, suggesting advanced electrochemical stability and enhanced electrochemical activity (Figure 5b).…”

A Holistic Additive Protocol Steers Dendrite‐Free Zn(101) Orientational Electrodeposition

“…[18,23,27] To demonstrate the practicability of the as-designed dextrin additive, AZIB full cells were assembled with a ZnVO cathode (Figure S27, Supporting Information). [28] Figure 6c illustrates the operation of a ZnVO||Zn full cell affording dextrin-1:120 electrolyte. As presented in the Nyquist plots in Figure 6d, the Warburg impedance manifesting the diffusion barrier could be fitted according to the relationship: Z′ = R s + R ct + Z w 𝜔 −0.5 within the low-frequency range, where Z′ is the imaginary part of impedance, R s is the internal resistance, R ct is the resistance of charge transfer, Z w is the Warburg impedance, and 𝜔 is the circular frequency.…”

Synchronous Dual Electrolyte Additive Sustains Zn Metal Anode with 5600 h Lifespan

“…To demonstrate the feasibility of thus-designed ZS-XY-GO electrolyte, ZIB full cells were assembled using Zn metal anode and Zn x V 2 O 5 • H 2 O (ZnVO) cathode [50] (Figure S29). Representative CV profiles of Zn j j ZnVO full cells filled with different electrolytes were collected.…”