High volumetric specific capacitance is essential for flexible supercapacitors. In this paper, a flexible composite electrode with ultrahigh volumetric specific capacitance and good rate performance is designed and prepared. The film electrode is composed of non-porous compact polyaniline as the matrix and a small amount of reduced graphene oxide sheets as the conductive filler. The film is prepared by a newly developed solution casting method, where the casting solution is obtained by self-assembly of polyaniline and graphene oxide in a blended solution. A systematical investigation on the effect of reduced graphene oxide sheets reveals that they serve as both the conductive filler and the diffusion barrier. With the optimized reduced graphene oxide content, a large volumetric specific capacitance of 1354 F cm⁻³ at 2.4 A cm⁻³ is achieved, and good rate performance is also obtained because of the good ionic conductivity of polyaniline. This work provides a high performance electrode for flexible supercapacitors, and the solution casting method is also valuable in fabricating other organic electrode materials.

高体积比电容对于柔性超级电容器至关重要。本文设计并制备了具有超高体积比电容和良好倍率性能的柔性复合电极。膜电极由无孔致密聚苯胺为基质，少量还原氧化石墨烯片为导电填料。该膜是通过新开发的溶液流延方法制备的，其中流延溶液是通过在混合溶液中自组装聚苯胺和氧化石墨烯而获得的。对还原的氧化石墨烯片的效果进行的系统研究表明，它们既可以用作导电填料，也可以用作扩散阻挡层。通过优化的减少的氧化石墨烯含量，可得到1354 F cm ^-3的大体积比电容由于聚苯胺具有良好的离子传导性，因此获得了在2.4A cm ^-3处的最大值，并且还获得了良好的速率性能。这项工作为柔性超级电容器提供了一种高性能电极，溶液浇铸法在制造其他有机电极材料方面也很有价值。