School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
Institute for Superconducting & Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW 2522, Australia.
Nano Lett. 2023 Jul 12;23(13):6050-6058. doi: 10.1021/acs.nanolett.3c01406. Epub 2023 Jun 27.
Aqueous zinc (Zn) batteries have been regarded as an alternative to lithium-ion batteries due to their high abundance, low cost, and higher intrinsic safety. However, the low Zn plating/stripping reversibility, Zn dendrite growth, and continuous water consumption have hindered the practical application of aqueous Zn anodes. Herein, a hydrous organic Zn-ion electrolyte based on a dual organic solvent, namely hydrated Zn(BF) zinc salt dissolved in dimethyl carbonate (DMC) and vinyl carbonate (EC) solvents [denoted as Zn(BF)/DMC/EC], can address these problems, which not only inhibits the side reactions but also promotes uniform Zn plating/stripping through the formation of a stable solid state interface layer and Zn-EC/2DMC pairs. This electrolyte enables the Zn electrode to stably undergo >700 cycles at a rate of 1 mA cm with a Coulombic efficiency of 99.71%. Moreover, the full cell paired with VO also demonstrates excellent cycling stability without capacity decay at 1 A g after 1600 cycles.
水合锌（Zn）电池因其丰富的储量、低廉的成本和更高的固有安全性而被认为是锂离子电池的替代品。然而，Zn 电镀/剥离的可逆性低、Zn 枝晶生长和持续的水消耗阻碍了水性 Zn 阳极的实际应用。在此，基于双有机溶剂的含水有机 Zn 离子电解质，即水合 Zn（BF）锌盐溶解在碳酸二甲酯（DMC）和碳酸乙烯酯（EC）溶剂中[表示为 Zn（BF）/DMC/EC]，可以解决这些问题，不仅抑制了副反应，而且通过形成稳定的固态界面层和 Zn-EC/2DMC 对促进了均匀的 Zn 电镀/剥离。该电解质使 Zn 电极能够以 1 mA cm 的速率稳定地经历 >700 次循环，库仑效率为 99.71%。此外，与 VO 配对的全电池在 1600 次循环后也表现出出色的循环稳定性，没有容量衰减。
