Zhou Guanbing, Yang Leyi, Li Weijun, Chen Chongyi, Liu Qiao
State Key Laboratory Base of Novel Functional Materials and Preparation Science, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
Institute of Materials, Ningbo University of Technology, Ningbo 315016, China.
iScience. 2020 Aug 26;23(9):101502. doi: 10.1016/j.isci.2020.101502. eCollection 2020 Sep 25.
Easy regenerability of core components such as electrode and electrolyte is highly required in advanced electrochemical devices. This work reports a reliable, regenerable, and stretchable hydrogel electrolyte based on ionic bonds between polyacrylic acid (PAA) and polyallylamine (PAH). PAA-PAH electrolyte (1M LiCl addition) exhibits high ionic conductivity (0.050 S·cm-1) and excellent mechanical property (fracture strain of 1,688%). Notably, the electrolyte can be regenerated to any desired shape under mild conditions and remains 96% and 90% of the initial ionic conductivity after the first and second regeneration, respectively. PAA-PAH/LiCl-based supercapacitor exhibits nearly 100% capacitance retention upon rolling, stretching, and 5,000 charge-discharge cycles, whereas the regenerated device holds 97.6% capacitance of the initial device and 90.9% after 5,000 cycles. This low-cost, high-efficiency, and regenerable hydrogel electrolyte reveals very promising use in solid-state/flexible supercapacitors and possibly becomes a standard commercial hydrogel electrolyte for sustainable electrochemical energy devices.
先进的电化学装置对电极和电解质等核心组件的易于再生性有很高要求。这项工作报道了一种基于聚丙烯酸（PAA）和聚烯丙胺（PAH）之间离子键的可靠、可再生且可拉伸的水凝胶电解质。PAA-PAH电解质（添加1M LiCl）表现出高离子电导率（0.050 S·cm-1）和优异的机械性能（断裂应变达1688%）。值得注意的是，该电解质在温和条件下可再生为任何所需形状，首次和第二次再生后分别保留初始离子电导率的96%和90%。基于PAA-PAH/LiCl的超级电容器在滚动、拉伸以及5000次充放电循环后电容保持率接近100%，而再生后的器件在5000次循环后保持初始器件电容的97.6%以及90.9%。这种低成本、高效率且可再生的水凝胶电解质在固态/柔性超级电容器中显示出非常有前景的应用，并且可能成为可持续电化学能量装置的标准商业水凝胶电解质。
