A Water‐Repellent Ionic Liquid/MOF Protective Layer for Stable Zinc Anodes

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Abstract Aqueous zinc‐ion batteries have emerged as promising candidates for large‐scale energy storage, but their cycle stability is limited by irreversible zinc anodes due to dendrite growth and undesired side reactions. Here, an artificial composite protective layer consisting of a Zn metal–organic framework (MOF) infiltrated with hydrophobic ionic liquid 1‐ethyl‐3‐methylimidazoline bis(trifluoromethyl sulfonyl) imide constructed on anodes. The unique porous structure the MOF enables uniform electric field distribution, effectively inducing plating stripping. Meanwhile, small amount can isolate direct contact between anode aqueous electrolyte, thereby inhibiting reactions including hydrogen evolution reaction. In addition, cations in act shielding suppress tip effect. Consequently, metal greatly improved. assembled symmetric cell able stably over 2600 h at 0.2 mA cm −2 /0.2 mAh 800 1 /1 , which also exhibits lower more stable overpotentials.

Language: Английский

Improved Performances of Zn//MnO2 Batteries with an Electrolyte Containing Co-Additives of Polyethylene Glycol and Lignin Derivatives

Polymers, Journal Year: 2025, Volume and Issue: 17(7), P. 888 - 888

Published: March 26, 2025

Multi-component electrolyte additives may significantly contribute to improving the performance of rechargeable aqueous zinc-ion batteries. Herein, we propose a mixed system employing polyethylene glycol 200 (PEG200) and quaternized kraft lignin (QKL) as co-additives in Zn//MnO2 Reduced corrosion suppression hydrogen evolution reaction on zinc electrode were achieved when 0.5 wt.% PEG200 0.2 QKL added reference electrolyte. This optimized electrolyte, 0.5% + 0.2% QKL, was conducive Zn reversibility Zn//Zn symmetric batteries resulted higher cycling stability, with coulombic efficiency 98.01% under 1 mA cm-2 mAh for Zn//Cu cells. Furthermore, full presented good overall electrochemical exhibited decent discharge capacity around 85 g-1 after 2000 cycles at 1.5 A g-1. As confirmed by X-ray diffraction scanning electron microscopy, dominant (002) oriental dendrite-free deposition anode battery using byproducts also reduced significantly. study has contributed development

Language: Английский

Surface Laser Texturing and Alloying: Front-End Design Optimization of Zinc Metal Anode for Dendrite-Free Deposition

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

A critical barrier to commercializing aqueous Zn-metal batteries lies in the dual challenges of dendritic Zn growth and parasitic side reactions at anode/electrolyte interface. Here, this study presents a front-end design optimization strategy for metal anodes (ZMAs), combining surface laser texturing with alloying treatment stabilize interfacial chemistry. Specifically, creates geometrically ordered microstructure on surface, while subsequent chemical permeation induces situ transformation microstructured layer into CuZn5 alloy, forming LT-Zn@CuZn5 anode. The alloy coating homogenizes electronic filed distribution across zinc enhances corrosion resistance. Thereby, anode demonstrated optimized electrochemical reversibility, sustaining over 3000 cycles 3 mA cm-2/1 mAh cm-2. This performance translates high improvement cycling behavior assembled Zn||I2 soft pack battery, which acquired an initial capacity 225.8 g-1 retained 79.1% after 4000 cycles. In contrast, counterpart employing untreated foil started lower 180.7 failed less than 478 effective approach improves ZMAs contributes development dendrite-free ZMAs.

Language: Английский