Stretchable, Healable, Adhesive, and Redox-Active Multifunctional Supramolecular Hydrogel Based Flexible Supercapacitor

Next-generation portable and wearable energy storage devices are expected to endure significant deformations and mechanical damage. Therefore, the electrolytes with superior self-healability, outstanding stretchability and excellent electrochemical performance are primarily necessary conditions for the realization of advanced supercapacitors, but still remains a huge challenge to develop thus electrolytes. Herein, a novel type of multifunctional supramolecular hydrogel electrolyte (DMAPS-PAA/H2SO4/BAAS) cross-linked through rationally designed ionic associations and hydrogen bonds is prepared by facile one-pot copolymerization. The obtained hydrogel displays a high ionic conductivity of 40 mS cm-1, significant instantaneous self-healing within 8 min, and a large stretch strain of more than 2000%. Surprisingly, it also demonstrates robust self-adhesiveness on the electrodes, which not only avoid the relative displacement and delamination between electrode and electrolyte layers during the consecutive mecha...