期刊
ACS NANO
卷 16, 期 4, 页码 6906-6915出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c02370
关键词
Zn metal anode; Zn-ion batteries; cation-exchange membrane; dendrite growth; side reaction
类别
资金
- National Natural Science Foundation of China [21890730, 21871177, 21890733, 51773115]
- Program for Basic Research of Shanghai Science and Technology Commission [19JC1412600]
- Natural Science Foundation of Shanghai [20ZR1427600]
The formation of Zn4SO4(OH)6middot5H2O byproducts is closely related to the direct contact between the Zn electrode and SO42-/H2O. A cation-exchange membrane of PFSA coated on the Zn surface can regulate the Zn plating/stripping behavior, resulting in a highly reversible process with corrosion-free and dendrite-free behavior.
Rechargeable aqueous zinc-ion batteries (ZIBs) have attracted extensive attention due to their low cost and high safety. However, the critical issues of dendrite growth and side reactions on the Zn metal anode hinder the commercialization of ZIBs. Herein, we demonstrated that the formation of Zn4SO4(OH)6middot5H2O byproducts is closely relevant to the direct contact between the Zn electrode and SO42-/H2O. On the basis of this finding, we developed a cation-exchange membrane of perfluorosulfonic acid (PFSA) coated on the Zn surface to regulate the Zn plating/stripping behavior. Importantly, the PFSA film with abundant sulfonic acid groups could simultaneously block the access of SO42- and H2O, accelerate the Zn2+ ion transport kinetics, and uniformize the electrical and Zn2+ ion concentration field on the Zn surface, thus achieving a highly reversible Zn plating/stripping process with corrosion-free and dendritefree behavior. Consequently, the PFSA-modified Zn anode exhibits high reversibility with 99.5% Coulombic efficiency and excellent plating/stripping stability (over 1500 h), subsequently enabling a highly rechargeable Zn-MnO2 full cell. The strategy of the cation-exchange membrane proposed in this work provides a simple but efficient method for suppression of side reactions.
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