A Five Micron Thick Aramid Nanofiber Separator Enables Highly Reversible Zn Anode for Energy‐Dense Aqueous Zinc‐Ion Batteries

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(39)

Published: July 15, 2024

Abstract The rampant dendrites growth caused by uncontrolled deposition of Zn 2+ ions at metal anode poses a significant obstacle to the practical applications aqueous zinc‐ion batteries (ZIBs). Herein, an ultrathin (5 µm) aramid nanofiber (ANF) separator is reported enhance stability and ZIB energy density. Through systematic experimental studies DFT simulations, it demonstrated that ANF with unique surface polarity can modify solvation configuration, facilitate desolvation, regulate orientation ions. Consequently, demonstrates 85‐fold increase in running time beyond 850 h compared conventional glass fiber 5 mA cm −2 /2.5 mAh . Even under harsh depth discharge conditions 50% 80%, anodes still sustain extended cycling periods over 475 200 h, respectively. As pairing this thin high‐areal‐capacity Mn 2.5 V 10 O 24 ∙5.9H 2 cathode low negative capacity/positive capacity ratio (2.64) full cell, superior gravimetric/volumetric density (129.2 Wh kg −1 /142.5 L ) achieved, far surpassing majority counterparts literature. This work offers promising for promoting utilization energy‐dense ZIBs.

Language: Английский

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Toward Simultaneous Dense Zinc Deposition and Broken Side‐Reaction Loops in the Zn//V₂O₅ System

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(11)

Published: Jan. 8, 2024

Abstract The Zn//V 2 O 5 system not only faces the incontrollable growth of zinc (Zn) dendrites, but also withstands cross‐talk effect by‐products produced from cathode side to Zn anode, inducing interelectrode talk and aggravating battery failure. To tackle these issues, we construct a rapid 2+ ‐conducting hydrogel electrolyte (R‐ZSO) achieve deposition modulation reaction inhibition in full cells. polymer matrix BN exhibit robust anchoring on SO 4 2− , accelerating migration enabling dense behavior. Therefore, Zn//Zn symmetric cells based R‐ZSO can operate stably for more than 1500 h, which is six times higher that employing blank electrolyte. More importantly, effectively decouples effects, thus breaking infinite loop reactions. As result, using this modified demonstrate stable operation over 1,000 cycles, with capacity loss rate 0.028 % per cycle. Our study provides promising gel chemistry, offers valuable guide construction high‐performance multifunctional aqueous Zn‐ion batteries.

Language: Английский

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Electric Double Layer Regulator Design through a Functional Group Assembly Strategy towards Long‐Lasting Zinc Metal Batteries

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(30)

Published: May 7, 2024

Abstract Regulating the electric double layer (EDL) structure of zinc metal anode by using electrolyte additives is an efficient way to suppress interface side reactions and facilitate uniform deposition. Nevertheless, there are no reports investigating proactive design EDL‐regulating before start experiments. Herein, a functional group assembly strategy proposed for modulating EDL, thereby realizing long‐lasting anode. Specifically, screening ten common groups, N, N‐dimethyl‐1H‐imidazole‐1‐sulfonamide (IS) designed assembling imidazole group, characterized its high adsorption capability on anode, sulfone which exhibits strong binding with Zn 2+ ions. Benefiting from functionalization IS molecules occupy position H 2 O in inner Helmholtz forming molecular protective inhibit O‐induced reactions. Meanwhile, IS, acting as site , promotes de‐solvation ions, facilitating compact Consequently, utilization significantly extending cycling stability Zn||Zn Zn||NaV 3 8 ⋅ 1.5H full cell. This study offers innovative approach EDL regulators high‐performance batteries.

Language: Английский

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Self‐Adaptive Hierarchical Hosts with Switchable Repulsive Shielding for Dendrite‐Free Zinc‐Ion Batteries

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(14)

Published: Feb. 5, 2024

Abstract The engineering of anode‐electrolyte interphase for highly reversible and dendrite‐free Zn plating‐stripping continues to pose a significant challenge in the progression aqueous Zn‐ion batteries (AZIBs). In this study, novel approach is introduced that involves design hierarchical carbon nanotube (CNT)‐based host through functionalization with cetyltrimethylammonium cations (CTA + ). This enables dynamically switchable repulsive shielding regulate plating. CNT scaffold, featured high flexibility conductivity, facilitates expandable accommodation continuous Concurrently, entangled CTA cations, acting as manipulators form shields, suppress growth dendrites, result uniform plating within cationic (C‐CNT) hosts. effect further elucidated density functional theory calculations. By incorporating self‐adaptive C‐CNT host, symmetric cells exhibit an impressively stable cycling lifespan exceeding 6500 h at 1 mA·cm −2 achieve cumulative capacity 6000 mAh·cm 4 . Full batteries, by coupling C‐CNT@Zn anode MnO 2 cathode, demonstrate 88% retention after 2000 cycles A·g −1 offers promising electrode‐electrolyte toward practical applications Zn‐based energy storage systems.

Language: Английский

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Trace Small Molecular/Nano‐Colloidal Multiscale Electrolyte Additives Enable Ultra‐Long Lifespan of Zinc Metal Anodes

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(38)

Published: July 17, 2024

Electrolyte additives are efficient to improve the performance of aqueous zinc-ion batteries (AZIBs), yet current electrolyte limited fully water-soluble (FWAs) and water-insoluble (WIAs). Herein, trace slightly (SWAs) zinc acetylacetonate (ZAA) were introduced ZnSO

Language: Английский

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