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Regulating the local chemical environment of Zn powder surface by multi-site anchoring effect to achieve highly-stable Zn anode
Energy Storage Materials ( IF 18.9 ) Pub Date : 2024-01-28 , DOI: 10.1016/j.ensm.2024.103229
Qi Li , Sihan Tang , Ruiying Luo , Peng Wei , Peng Chen , Jianlong Cong , Guizhou Liu , Zhufeng Liu , Yizhong Gou , Hongzhi Wu , Shixiong Sun , Jiantao Han , Yusheng Shi , Chun Fang , Chunze Yan

Aqueous rechargeable zinc-ion batteries (ZIBs) have attracted much attention due to high safety, fast charge/discharge rate, low cost and direct utilization of zinc metal anodes. Zn powder (Zn-P) -based anodes are considered as ideal candidates for Zn-based batteries owing to their positive synergistic integration of safety and energy density through the design of the N/P ratio. However, Zn-P anodes still experience easy corrosion, hydrogen evolution and uncontrolled dendrite growth, which restrict their further application. Herein, we rationally introduce a hydrophilic polymer with multiple hydrogen bond acceptor sites to Zn-P anode to prepare a novel poly(ethylene glycol) diacrylate (PEGDA) modified Zn powder (Zn-PD) anode. By anchoring water molecules through multiple hydrogen bonds, the solvation structure of Zn2+ is modulated, and the electrochemical activity of free water at the interface is reduced, which inhibits Zn corrosion and hydrogen evolution.



中文翻译:

通过多位点锚定效应调节锌粉表面局部化学环境实现高稳定性锌阳极

水系可充电锌离子电池(ZIB)由于安全性高、充放电速率快、成本低以及直接利用锌金属负极而备受关注。锌粉(Zn-P)基负极由于通过 N/P 比的设计实现了安全性和能量密度的积极协同整合,因此被认为是锌基电池的理想候选者。然而,Zn-P阳极仍然存在易腐蚀、析氢和不受控制的枝晶生长等问题,限制了其进一步应用。在此,我们将具有多个氢键受体位点的亲水性聚合物合理地引入到Zn-P负极中,制备了新型聚乙二醇二丙烯酸酯(PEGDA)改性锌粉(Zn-PD)负极。通过多个氢键锚定水分子,调节Zn 2+的溶剂化结构,降低界面自由水的电化学活性,抑制Zn腐蚀和析氢。

更新日期:2024-01-30
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