Anti-Freezing Hydrogel Electrolyte with Regulated Hydrogen Bond Network Enables High-Rate and Long Cycling Zinc Batteries

IF 32.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Energy & Environmental Science Pub Date : 2024-11-12 DOI:10.1039/d4ee02772h
Shaojie Guo, Mengyu Yan, DongMing Xu, Pan He, Kaijian Yan, Jiexin Zhu, Yongkun Yu, Zeya Peng, Yanzhu Luo, Feifei Cao
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Abstract

Zinc-based batteries, utilizing hydrogel electrolytes, present significant promise as power sources for next-generation flexible devices due to their stretchable nature and enhanced safety features. Nonetheless, the current hydrogel electrolytes require improvements in terms of cycling stability and rate capability. In this study, 1,2-propylene glycol is added as co-solvent to polyacrylamide hydrogel electrolytes. The co-solvent effectively modulates the internal hydrogen bond network of the hydrogel through hydroxyl and terminal methyl groups, inhibits the activity of water while preventing the solvent from forming “hand-in-hand” long-chain molecular structure, and enhances the stability of the electrode/electrolyte interface. Consequently, the symmetrical battery assembled with PAM-1,2-PG exceeded 490 h at 100 mA cm-2 and 50 mA h cm-2 (DOD of 86%). The change of hydrogen bond network endows the battery with remarkable low-temperature performance, which is more than 3780 h under -30 °C at 1 mA cm-2. Furthermore, the resulting aqueous zinc-based devices showcase high capacity and outstanding cycling durability in a wide temperature range. This work provides valuable insights into the development of high-performance hydrogel electrolytes, paving the way for dendrite-free, fast-charging, and environmentally adaptable Zn-based energy storage systems.
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具有调节氢键网络的抗冻水凝胶电解质可实现高倍率和长循环锌电池
利用水凝胶电解质的锌基电池因其可拉伸性和更强的安全性,有望成为下一代柔性设备的电源。然而,目前的水凝胶电解质在循环稳定性和速率能力方面需要改进。本研究在聚丙烯酰胺水凝胶电解质中添加了 1,2 丙二醇作为助溶剂。助溶剂通过羟基和末端甲基有效地调节了水凝胶内部的氢键网络,抑制了水的活性,同时防止溶剂形成 "手拉手 "长链分子结构,提高了电极/电解质界面的稳定性。因此,使用 PAM-1,2-PG 组装的对称电池在 100 mA cm-2 和 50 mA h cm-2 条件下的工作时间超过了 490 小时(DOD 为 86%)。氢键网络的变化赋予了电池卓越的低温性能,在 1 mA cm-2 的条件下,电池在零下 30 °C 的温度下可使用 3780 小时以上。此外,所制备的锌基水溶液器件在很宽的温度范围内都能表现出高容量和出色的循环耐久性。这项研究为开发高性能水凝胶电解质提供了宝贵的见解,为实现无枝晶、快速充电和环境适应性强的锌基储能系统铺平了道路。
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来源期刊
Energy & Environmental Science
Energy & Environmental Science 化学-工程:化工
CiteScore
50.50
自引率
2.20%
发文量
349
审稿时长
2.2 months
期刊介绍: Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).
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