电解质
材料科学
己内酰胺
法拉第效率
无机化学
电化学
阳极
化学工程
水溶液
乙酰胺
电化学窗口
深共晶溶剂
共晶体系
高分子化学
化学
合金
有机化学
电极
离子电导率
冶金
物理化学
工程类
作者
Shih-Yu Wang,Ganxiong Liu,Wang Wan,Xueyang Li,Ju Li,Chao Wang
标识
DOI:10.1002/adma.202306546
摘要
Aqueous Zn-ion batteries (AZIBs) are promising for grid-scale energy storage. However, conventional AZIBs face challenges including hydrogen evolution reaction (HER), leading to high local pH, and by-product formation on the anode. Hereby the hydrogen bonds in the aqueous electrolyte are reconstructed by using a deep eutectic co-solvent (DES) made of acetamide (H-bond donor) and caprolactam (H-bond acceptor), which effectively suppresses the reactivity of water and broadens the electrochemical voltage stability window. The coordination between Zn2+ and acetamide-caprolactam in DES-based electrolytes produces a unique solvation structure that promotes the preferential growth of Zn crystals along the (002) plane. This will inhibit the formation of Zn dendrites and ensure the uniform deposition of Zn-ions on the anode surface. In addition, it is found that this DES-based electrolyte can form a protective membrane on the anode surface, reducing the risks of Zn corrosion. Compared to conventional electrolytes, the DES-based electrolyte shows a long-term stable plating/stripping performance with a significantly improved Coulombic efficiency from 78.18% to 98.37%. It is further demonstrated that a Zn||VS2 full-cell with the DES-based electrolyte exhibits enhanced stability after 500 cycles with 85.4% capacity retention at 0.5 A g-1 .
科研通智能强力驱动
Strongly Powered by AbleSci AI