Yuan Jingjing, Li Yifan, Ma Yuqing, Ruan Yuan, He Junjie, Xu Hui, Zhang Zhongqiang, He Guangyu, Chen Haiqun
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, China.
Changzhou Qiantai Medical Technology Co., Ltd., Changzhou, China.
Chem Asian J. 2024 Nov 18;19(22):e202400812. doi: 10.1002/asia.202400812. Epub 2024 Oct 21.
Aqueous zinc-ion batteries have become a promising energy storage battery due to high theoretical specific capacity, abundant zinc resources and low cost. However, zinc dendrite growth and hydrogen evolution reaction limit their application. This study aims to improve the cycling performance and stability of aqueous zinc-ion batteries by improving the gel electrolyte. Polyacrylamide (PAM) is selected as the base material of the gel electrolyte, which has good stability and safety, but the water retention capacity, Zn migration number, and ionic conductivity of PAM are low, which affects the long-term stability of the battery. In response to these problems, we optimized PAM by chemical cross-linking method, and formed an enhanced PAM gel by adding disodium citrate dihydrate (SC). Experimental results show that the introduction of an appropriate amount of SC in the enhanced PAM gel electrolyte can significantly improve its electrochemical performance. The zinc-ion symmetric battery achieved a stable cycle of more than 2100 hours at a current density of 0.5 mA cm, which is mainly attributed to the inhibitory effect of the enhanced PAM gel on zinc dendrite growth and hydrogen evolution reaction. This study provides a new direction for the development and application of flexible zinc-ion batteries.
水系锌离子电池因其高理论比容量、丰富的锌资源和低成本，已成为一种很有前景的储能电池。然而，锌枝晶生长和析氢反应限制了它们的应用。本研究旨在通过改进凝胶电解质来提高水系锌离子电池的循环性能和稳定性。选择聚丙烯酰胺（PAM）作为凝胶电解质的基础材料，其具有良好的稳定性和安全性，但PAM的保水能力、锌迁移数和离子电导率较低，这影响了电池的长期稳定性。针对这些问题，我们通过化学交联法对PAM进行优化，并通过添加二水合柠檬酸二钠（SC）形成增强型PAM凝胶。实验结果表明，在增强型PAM凝胶电解质中引入适量的SC可以显著提高其电化学性能。锌离子对称电池在0.5 mA cm的电流密度下实现了超过2100小时的稳定循环，这主要归因于增强型PAM凝胶对锌枝晶生长和析氢反应的抑制作用。本研究为柔性锌离子电池的开发和应用提供了新的方向。
