Figure 3

Mechanical performance of the structural supercapacitors and comparison of mechanical vs. electrochemical performance. (a) Stress-strain measurement for a structural composite with a Kevlar separator. (b) Photographs before and after the tensile testing. (c) Schematic highlighting the mechanical failure of the steel mesh. (d) Plot of the tensile strength versus the specific energy comparing our devices, literature and the performance targets. (e) Plot of the Young’s modulus versus the specific energy comparing our devices, literature, and the performance targets.