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Harnessing Polymer Matrix Hydrophilicity in Structurally Robust Zincophilic Composite Layers for High-Performance Aqueous Zinc-Ion Batteries
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- Authors
- Yanghyun Cho, Dong Won Hae, Hyeong Jun Kook, Jongha Hwang, Dong Ok Shin, Woo-Jin Song
- Citation
- ACS Applied Materials and Interfaces, Early Access
- ISSN
- 1944-8244
- Publisher
- American Chemical Society
- Language
- English
- Type
- Journal Article
- Abstract
- Aqueous zinc-ion batteries (AZIBs) represent promising next-generation energy-storage systems owing to their intrinsic safety afforded by water-based electrolytes, low material costs, and high theoretical capacity. However, uncontrolled dendrite growth with nonuniform Zn2+ flux at the electrode-electrolyte interface severely impedes their practical implementation. In this work, we develop a zincophilic-hydrophilic polymer composite layer to regulate Zn deposition via coordinated ionic and electronic transport. The integration of the hydrophilic poly(acrylic acid) (PAA) with a zincophilic carbon black filler forms an ionically and electronically conductive protective layer on the Zn anode. This zincophilic polymer composite (ZLPC) layer facilitates efficient electrolyte wetting throughout the composite network, thereby activating internal zincophilic sites and homogenizing Zn2+ flux across the electrode-electrolyte interface. This synergistic ionic and electronic regulation mitigates localized current density and induces uniform Zn nucleation, yielding dendrite-free Zn deposition. Consequently, the ZLPC@Zn anode achieves a cycling life exceeding 3000 h at 4 mA cm-2, with a cumulative plating capacity of 2400 mAh cm-2. Furthermore, ZLPC@Zn pouch cells exhibit a volumetric energy density of 17.92 Wh L-1, demonstrating strong potential for practical AZIB applications. This study presents a scalable, cost-effective interfacial engineering strategy for high-performance AZIBs.
- Keyword
- polymer composite layer, hydrophilic polymer matrix, zincophilic filler, zinc anode, aqueous zinc-ion batteries
- KSP Keywords
- Composite network, Dendrite growth, Dendrite-free, Electronic transport, Energy storage(ES), Engineering strategy, High performance, Hydrophilic polymer, Interfacial engineering, Intrinsic safety, Next-generation