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.

先进的电化学装置非常需要电极和电解质等核心部件的易于再生性。这项工作报告了一种基于聚丙烯酸（PAA）和聚烯丙胺（PAH）之间的离子键的可靠、可再生和可拉伸的水凝胶电解质。PAA-PAH电解质（添加1M LiCl）具有高离子电导率（0.050 S·cm-1）和优异的机械性能（断裂应变为1,688%）。值得注意的是，电解质可以在温和条件下再生为任何所需的形状，并且在第一次和第二次再生后分别保持初始离子电导率的96%和90%。PAA-PAH/LiCl 基超级电容器在滚动、拉伸和 5,000 次充放电循环后表现出近 100% 的电容保持率，而再生器件的电容为初始器件的 97.6%，在 5,000 次循环后为 90.9%。这种低成本、高效率和可再生的水凝胶电解质在固态/柔性超级电容器中具有非常有前景的用途，并可能成为可持续电化学能源设备的标准商业水凝胶电解质。