Carboxylic bacterial cellulose fiber-based hydrogel electrolyte with imidazole-type ionic liquid for dendrite-free zinc metal batteries

Tianyun Zhang , Xiaohong Shi , Yu Li , Sambasivam Sangaraju , Fujuan Wang , Liang Yang , Fen Ran
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Abstract

Aqueous zinc metal batteries are regarded as the most promising energy storage system due to their advantages of high safety, low cost, and high theoretical capacity. However, the growth of dendrites and the occurrence of side reactions hinder the development of zinc metal batteries. Despite previous attempts to design advanced hydrogel electrolytes, achieving high mechanical performance and ionic conductivity of hydrogel electrolytes has remained challenging. In this work, a hydrogel electrolyte with an ionic crosslinked network is prepared by carboxylic bacterial cellulose fiber and imidazole-type ionic liquid, following by a covalent network of polyacrylamide. The hydrogel electrolyte possesses a superior ionic conductivity of 43.76 mS cm−1, leading to a Zn2+ migration number of 0.45, and high mechanical performance with an elastic modulus of 3.48 GPa and an elongation at breaking of 38.36%. More importantly, under the anion-coordination effect of the carboxyl group in bacterial cellulose and [BF4] in imidazole-type ionic liquid, the solvation sheath of hydrated Zn2+ ions and the nucleation overpotential of Zn plating are regulated. The results of cycled testing show that the growth of zinc dendrites is effectively inhibited and the generation of irreversible by-products is reduced. With the carboxylic bacterial cellulose-based hydrogel electrolyte, the Zn||Zn symmetric batteries offer good cyclability as well as Zn||Ti batteries.

Abstract Image

基于羧基细菌纤维素纤维的水凝胶电解质与咪唑类离子液体,用于无枝晶型锌金属电池
锌金属水电池具有安全性高、成本低和理论容量大等优点,被认为是最有前途的储能系统。然而,枝晶的生长和副反应的发生阻碍了锌金属电池的发展。尽管以前曾尝试过设计先进的水凝胶电解质,但实现水凝胶电解质的高机械性能和离子导电性仍然具有挑战性。在这项研究中,利用羧基细菌纤维素纤维和咪唑类离子液体以及聚丙烯酰胺共价网络制备了一种具有离子交联网络的水凝胶电解质。该水凝胶电解质具有 43.76 mS cm-1 的优异离子电导率,使 Zn2+ 迁移数达到 0.45,并具有 3.48 GPa 的弹性模量和 38.36% 的断裂伸长率等高机械性能。更重要的是,在细菌纤维素中的羧基和咪唑类离子液体中的[BF4]-阴离子配位作用下,水合 Zn2+ 离子的溶解鞘和 Zn 镀层的成核过电位得到了调节。循环测试结果表明,锌树枝状突起的生长得到了有效抑制,不可逆副产物的生成也有所减少。在羧酸菌纤维素水凝胶电解质的作用下,Zn||Zn 对称电池与 Zn||Ti 电池一样具有良好的循环性能。
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来源期刊
材料导报:能源(英文)
材料导报:能源(英文) Renewable Energy, Sustainability and the Environment, Nanotechnology
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13.00
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