华中科技大学夏宝玉团队研制了用于固态可充电锌-空气/碘化物混合电池的双网结构水凝胶电解质。相关研究成果于2022年9月12日发表在《德国应用化学》。

作为电池的关键部件，电解液决定了阴极和阳极的离子传输和界面化学。

该文中，研究人员开发了用于固态锌-空气/碘化物混合电池的由聚丙烯酰胺（PAM）、海藻酸钠（SA）和碘化钾（KI）组成的双网络结构水凝胶电解质。组合式混合动力电池具有优异的可再生性和110小时的长循环寿命，能量效率高达80%。离子交联双网络结构赋予材料改进的机械强度和增加的离子电导率。

更重要的是，碘物种的引入不仅提供了比氧电催化更有利的碘化物/碘酸盐氧化还原的阴极动力学，而且还调节了锌离子的溶剂化结构，以确保更好的界面稳定性。

该项工作为开发新型固态电解质以实现高性能能源设备和技术提供了重要的概念。

附：英文原文

Title: Dual-Network Structured Hydrogel  Electrolytes Engaged  Solid-State Rechargeable Zn-Air/Iodide Hybrid  Batteries

Author: Qingqing Liu, Chenfeng Xia, Chaohui He, Wei Guo, Zi Ping Wu, Zhen Li, Qiang Zhao, Bao Yu Xia

Issue&Volume: 2022-09-12

Abstract: As a key component of batteries, the electrolyte determines the ion transport and interface chemistry of the cathode and anode. In this work, we develop a dual-network structured hydrogel electrolyte composed of polyacrylamide (PAM), sodium alginate (SA) and potassium iodide (KI) for solid-state zinc-air/iodide hybrid batteries. The assembled hybrid battery shows excellent renewability and a long cycling life of 110 h with a high energy efficiency of 80%. The ion-crosslinked dual-network structure endows the material with improved mechanical strength and increased ionic conductivity. More importantly, the introduction of iodine species not only offers more favorable cathodic kinetics of iodide/iodate redox than oxygen electrocatalysis but also regulates the solvation structure of zinc ions to ensure better interface stability. This work provides significant concepts for developing novel solid-state electrolytes to realize high-performance energy devices and technologies.

DOI: 10.1002/anie.202210567

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202210567