4.8 Article

Zincophilic Interfacial Manipulation against Dendrite Growth and Side Reactions for Stable Zn Metal Anodes

Journal

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202312145

Keywords

Coordination Compounds; Dendrite-Free; Side Reactions; Zincophilic Interphase; Zn Metal Anodes

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In this study, a phytic acid (PA)-ZnAl coordination compound is used as a multifunctional interphase layer to achieve highly reversible and dendrite-free Zn metal anodes. The zincophilic PA-ZnAl layer enables controlled Zn2+ flux, rapid desolvation kinetics, improved Zn2+ transfer number, and suppressed side reactions, leading to high Coulombic efficiency and enhanced cycling performance with dendrite-free morphology.
Constructing multifunctional interphases to suppress the rampant Zn dendrite growth and detrimental side reactions is crucial for Zn anodes. Herein, a phytic acid (PA)-ZnAl coordination compound is demonstrated as a versatile interphase layer to stabilize Zn anodes. The zincophilic PA-ZnAl layer can manipulate Zn2+ flux and promote rapid desolvation kinetics, ensuring the uniform Zn deposition with dendrite-free morphology. Moreover, the robust PA-ZnAl protective layer can effectively inhibit the hydrogen evolution reaction and formation of byproducts, further contributing to the reversible Zn plating/stripping with high Coulombic efficiency. As a result, the Zn@PA-ZnAl electrode shows a lower Zn nucleation overpotential and higher Zn2+ transference number compared with bare Zn. The Zn@PA-ZnAl symmetric cell exhibits a prolonged lifespan of 650 h tested at 5 mA cm-2 and 5 mAh cm-2. Furthermore, the assembled Zn battery full cell based on this Zn@PA-ZnAl anode also delivers decent cycling stability even under harsh conditions. A phytic acid (PA)-ZnAl coordination compound is demonstrated as a multifunctional interphase layer to achieve highly reversible and dendrite-free Zn metal anodes. The zincophilic PA-ZnAl layer enables the homogenized Zn2+ flux, rapid desolvation kinetics, enhanced Zn2+ transference number, and suppressed side reactions, thus contributing to the high Coulombic efficiency and enhanced cycling performance with dendrite-free morphology.image

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