In order to improve the energy and power density of all-solid-state supercapacitor, more attention is currently focused on the development of electrodes and electrolyte materials with various chemical structure and compositions. However, current studies rarely report hydrogel electrodes with high content of active materials (i.e. > 20.0 wt%), and study their influence on the performance of supercapacitors. Here, a double-network hydrogel electrode was developed and prepared by blade-coating and 3D printing for application in all-solid-state supercapacitor. Moreover, the hydrogel electrode has an unusually high content (25.0 wt%) of active material, leading to high area specific capacitance (871.4mF/cm²) and area energy density (0.14 mWh/cm² at 0.27 mW/cm².). This study opens a new pathway to develop high-performance all-solid-state supercapacitors on large-scale.

为了提高全固态超级电容器的能量和功率密度，目前更多的注意力集中在具有各种化学结构和成分的电极和电解质材料的开发上。然而，目前的研究很少报道活性材料含量高（即> 20.0 wt%）的水凝胶电极，并研究它们对超级电容器性能的影响。在这里，通过刮刀涂层和 3D 打印开发和制备了双网络水凝胶电极，用于全固态超级电容器。此外，水凝胶电极具有异常高的活性材料含量 (25.0 wt%)，导致高面积比电容 (871.4mF/cm ² ) 和面积能量密度 (0.14 mWh/cm ² at 0.27 mW/cm ².) 该研究为大规模开发高性能全固态超级电容器开辟了新途径。