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Anion Induced Electric Double Layer Compression and Desolvation Optimization Enable Long Life Zinc Anodes under High‐Rate
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Anion Induced Electric Double Layer Compression and Desolvation Optimization Enable Long Life Zinc Anodes under High‐Rate
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Journal Article
Anion Induced Electric Double Layer Compression and Desolvation Optimization Enable Long Life Zinc Anodes under High‐Rate
2025
Overview
Aqueous zinc‐ion batteries (AZIBs) represent a promising next‐generation energy storage solution. However, AZIBs suffer from severe dendrite growth caused by rampant Zn2⁺ 2D diffusion and sluggish desolvation kinetics, thus exhibiting extremely short cycle life under high‐rate conditions. Here in, a novel additive DL‐O‐Methylserine (MeSer) is reported, which effectively optimizes Zn2⁺ diffusion behavior and facilitates the desolvation process. Experimental and computational results reveal that MeSer− adsorption on the electrode surface compresses the electric double layer (EDL), thereby reducing repulsive forces within it. The decrease in repulsion further enhances Zn2⁺ 3D diffusion leading to uniform deposition. Furthermore, MeSer− interacts with Zn2⁺ located in solvation sheath, reducing desolvation energy barriers and improving rate capability. Consequently, Zn||Zn symmetric cells with MeSer exhibits superior cycling stability of 2320 h under 5 mA cm−2 and 5 mA h cm−2 and can endure extreme high‐current conditions (20 mA cm−2, 20 mA h cm−2) for up to 600 h, such performance exceeds most of the previously documented results. The Zn||V2O5 full cells maintained 86% capacity retention after 3500 cycles at 5 A g−1. This work demonstrates the remarkable effectiveness of a simple EDL regulation strategy in enhancing AZIB performance. Here, the ionic additive MeSer compresses the EDL, reducing its thickness and internal repulsion, thereby enhancing 3D diffusion to achieve smooth Zn deposition. Meanwhile, MeSer− promote Zn2⁺ desolvation within the EDL, improving rate performance. Consequently, the symmetric cell operates for 600 h at 20 mA cm−2 and 20 mA h cm−2, and the full cell stably cycles over 3500 cycles at 5 A g−1.
Publisher
John Wiley & Sons, Inc,Wiley
Subject
