Multiple Regulation of Electrolyte with Trace Amounts of Sodium Dehydroacetate Additives Enables High‐Performance Aqueous Zinc‐Ion Batteries

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

Published: March 26, 2025

Rechargeable aqueous zinc-ion batteries (AZIBs) draw much attention for low cost and high safety. However, hydrogen evolution reaction (HER) uneven Zn2+ deposition shorten lifespan, hampering commercial use. In this study, sodium dehydroacetate (SD) containing carbonyl keto-carbonyl is introduced as multifunctional electrolyte additives, which effectively modifies the solvent shell structure, achieving a transference number of up to 0.72. Acting bond acceptor, SD disrupts water network thereby increasing HER overpotential by 22 mV corrosion potential 9 mV. The polar functional groups in can reversibly capture H⁺ ions dynamically neutralize OH⁻ ions, maintaining interfacial pH balance on zinc anode suppressing HER. Notably, not only alters electrolyte's kinetic but also induces uniform along (002) plane, inhibiting dendrite growth minimizing side reactions. This phenomenon demonstrated both symmetric full-cell configurations. Zn//Zn cell achieves an ultra-long cycling lifespan 2800 hours at 5 mA cm⁻2, Zn//VO2 full battery maintains capacity retention rate 73.09% after 2000 cycles with average coulombic efficiency 99.98%, underscoring effectiveness additive enhancing performance.

Language: Английский

Sulfhydryl and Sulfonic Acid Bifunctional Group Achieving (101) Crystal Preferential Reversible Zn²⁺ Electrodeposition Without Dendrite and Nucleation Overpotential

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

Published: April 14, 2025

Abstract Disordered electrodeposition of Zn 2+ resulted in serious dendrite and hydrogen evolution reactions, greatly decreasing the energy efficiency durability aqueous zinc ion batteries (AZIBs). Herein, sodium 2‐mercaptoethanesulfonate (MSN) is proposed as a new additive to achieve induced directional on (101) crystal surface form dense uniform metal layer via cooperative effect sulfhydryl sulfonic acid groups. Different from reported additives, MSN molecules promote rapid formation adsorption layer, which accelerates its directed migration rate orderly nucleation process, achieving eliminated dendrites overpotential, far superior additives. The MSN‐introduced Zn||Zn symmetric battery displays amazing stably cycled for more than 3500 h at 2 mA cm −2 @ mAh , over 1 000 even under harsh conditions (5 5 ). Furthermore, Zn||δ‐MnO coin offers high capacity 201.5 g −1 low recession 1% during 800 cycles A higher that blank sample (121.3 56.1%), respectively, fully demonstrating extraordinary advantages contributions molecules.

Language: Английский

Unlocking the effect of alkyl chain length and hydroxyl group of electrolyte additives enabling stabilization of zinc anodes

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163910 - 163910

Published: May 1, 2025

Language: Английский