Zhou Hongyang, He Qi, Liu Xuran, Jiang Qianqian, Chu Dawang, Wang Qiong, Yang Xuan, Zhang Tongling, Wang Hongkun, Li Zhenglong
Institute of Zhejiang University-Quzhou, 99 Zheda Road, Quzhou 324000, China; State Key Laboratory of Chemical Engineering, Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
College of Material Engineering, North China Institute of Aerospace Engineering, Langfang 065000, China.
Carbohydr Polym. 2025 Mar 15;352:123116. doi: 10.1016/j.carbpol.2024.123116. Epub 2024 Dec 4.
Cellulose has outstanding potential for application in energy storage batteries due to its high temperature resistance, high electrolyte affinity, renewability, and suppression of the shuttle effect, but single cellulose membranes still suffer from problems such as inhomogeneous pore distribution and unstable three-dimensional network structure. In this study, a green and sustainable regenerative cellulose (RC)/sodium alginate (SA) gel electrolyte membrane is developed by sol-gel process, the double crosslinked network scaffold centered on Zn was constructed by the synergistic hydrogen-bonding and metal ion- coordination network, the stable and uniform pore structure was also formed. The obtained RC-SA gel electrolyte membrane exhibits outstanding performance, featuring a dual crosslinked network with abundant pore structure and numerous polar groups that effectively enhance Zn transport, significantly improving battery cycling performance. The corresponding RC-SA gel electrolyte membrane demonstrates high ionic conductivity (6.30 mS·cm) and Zn transference number (0.66), leading to excellent reversible capacity (159 mA·h·g) and self-discharge suppression capability (maintaining 99.2 % of capacity after a 24 h standstill) in Zn//VO full-cell. The coulombic efficiency and cycling stability of the Zn//Cu half-cell and Zn//Zn symmetric cell using RC-SA gel electrolyte membrane outperforms that of the glass fiber separator, highlighting its multifunctionality and potential applications.
纤维素因其耐高温、对电解质亲和力高、可再生以及抑制穿梭效应等特性，在储能电池领域具有巨大的应用潜力，但单一的纤维素膜仍存在诸如孔径分布不均和三维网络结构不稳定等问题。在本研究中，通过溶胶 - 凝胶法制备了一种绿色可持续的再生纤维素（RC）/海藻酸钠（SA）凝胶电解质膜，以锌为中心构建了由氢键和金属离子配位网络协同作用的双交联网络支架，同时形成了稳定且均匀的孔结构。所制备的RC - SA凝胶电解质膜表现出优异的性能，其具有丰富孔结构和众多极性基团的双交联网络能有效促进锌离子传输，显著提升电池的循环性能。相应的RC - SA凝胶电解质膜展现出高离子电导率（6.30 mS·cm）和锌离子迁移数（0.66），在锌//钒全电池中实现了出色的可逆容量（159 mA·h·g）和自放电抑制能力（静置24小时后容量保持99.2%）。使用RC - SA凝胶电解质膜的锌//铜半电池和锌//锌对称电池的库仑效率和循环稳定性均优于玻璃纤维隔膜，突出了其多功能性及潜在应用价值。
