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Article Abstract
Aqueous zinc metal batteries are promising candidates for large-grid energy storage due to their safety, cost-effectiveness, and durability. However, challenges like dendrite growth, corrosion, and the hydrogen evolution reaction (HER) on the zinc anode hinder their performance. Herein, we propose a sustainable and scalable approach to form a copper gluconate@carboxymethyl chitosan@kaolin (CuCK) interface layer, inducing gradient nucleation sites via in situ galvanic and galvanostatic processes. The biomass-based CuCK coating features a gradient CuZn alloy structure that homogenizes interfacial electric field distribution and enhances electrochemical stability. Furthermore, the incorporated Cu-loaded kaolin and carboxymethyl chitosan regulate Zn flux, accelerate Zn desolvation, and suppress HER. The resulting Zn@CuCK anode achieves a high cumulative capacity of 5500 mAh cm in symmetrical cells, exhibits excellent durability in Zn@CuCK//NaVO·1.5HO full cells across a wide temperature range (-30 to 60 °C), and endows the assembly of pouch cells with high energy density.
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