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Zn Metal Anodes for Zn-Ion Batteries in Mild Aqueous Electrolytes: Challenges and Strategies

Department of Chemical and Biological Engineering, Gachon University, Seongnam 13120, Gyeonggi, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this study.
Academic Editor: Christophe Detavernier
Nanomaterials 2021, 11(10), 2746; https://doi.org/10.3390/nano11102746
Received: 28 September 2021 / Revised: 13 October 2021 / Accepted: 14 October 2021 / Published: 17 October 2021
(This article belongs to the Special Issue Nanomaterials for Ion Battery Applications)
Over the past few years, rechargeable aqueous Zn-ion batteries have garnered significant interest as potential alternatives for lithium-ion batteries because of their low cost, high theoretical capacity, low redox potential, and environmentally friendliness. However, several constraints associated with Zn metal anodes, such as the growth of Zn dendrites, occurrence of side reactions, and hydrogen evolution during repeated stripping/plating processes result in poor cycling life and low Coulombic efficiency, which severely impede further advancements in this technology. Despite recent efforts and impressive breakthroughs, the origin of these fundamental obstacles remains unclear and no successful strategy that can address these issues has been developed yet to realize the practical applications of rechargeable aqueous Zn-ion batteries. In this review, we have discussed various issues associated with the use of Zn metal anodes in mildly acidic aqueous electrolytes. Various strategies, including the shielding of the Zn surface, regulating the Zn deposition behavior, creating a uniform electric field, and controlling the surface energy of Zn metal anodes to repress the growth of Zn dendrites and the occurrence of side reactions, proposed to overcome the limitations of Zn metal anodes have also been discussed. Finally, the future perspectives of Zn anodes and possible design strategies for developing highly stable Zn anodes in mildly acidic aqueous environments have been discussed. View Full-Text
Keywords: Zn metal anode; aqueous Zn ion batteries; mildly acidic electrolyte; dendrite-free; hydrogen evolution reaction suppression Zn metal anode; aqueous Zn ion batteries; mildly acidic electrolyte; dendrite-free; hydrogen evolution reaction suppression
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MDPI and ACS Style

Hoang Huy, V.P.; Hieu, L.T.; Hur, J. Zn Metal Anodes for Zn-Ion Batteries in Mild Aqueous Electrolytes: Challenges and Strategies. Nanomaterials 2021, 11, 2746. https://doi.org/10.3390/nano11102746

AMA Style

Hoang Huy VP, Hieu LT, Hur J. Zn Metal Anodes for Zn-Ion Batteries in Mild Aqueous Electrolytes: Challenges and Strategies. Nanomaterials. 2021; 11(10):2746. https://doi.org/10.3390/nano11102746

Chicago/Turabian Style

Hoang Huy, Vo P., Luong T. Hieu, and Jaehyun Hur. 2021. "Zn Metal Anodes for Zn-Ion Batteries in Mild Aqueous Electrolytes: Challenges and Strategies" Nanomaterials 11, no. 10: 2746. https://doi.org/10.3390/nano11102746

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