Abstract
The uncontrol growth of Zn dendrite and sluggish transport kinetics considerably hampered the practical application of aqueous zinc-ion batteries (AZIBs). Herein, we originally develop a simple and low-cost spinel oxide Zn2TiO4 (ZTO) nanoparticle as a multifunctional artificial protective modulator to optimize the Zn anode. As verified by comprehensive experimental and theoretical analyses, the highly reactive ZTO modulator possesses prominent zincophilicity to preferentially adsorb Zn2+, accelerates the de-solvation and diffusion kinetics of Zn2+, and achieves uniform Zn2+ deposition by regulation the surface electric field distribution of Zn anode. Through this “adsorption-diffusion-deposition” process of Zn2+, a dendrite-free and kinetics-enhanced Zn metal anode was achieved. Consequently, the ZTO@Zn symmetric cell manifests the excellent reversibility, achieving 10,000 cycles plating/stripping processes at 20 mA cm−2 and stable cycling for more than 85 h even at 85 % depth of discharge. Notably, the ZTO@Zn||MnO2 pouch cell exhibits an exceptional capacity of 215.9 mAh g−1 at 0.5 A g−1 and nearly 100 % coulombic efficiency after 300 cycles. This study provides a promising insight into the design of low-cost and highly reactive spinel oxide as an artificial protective modulator for Zn anode.
Published Version
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