Microscopically Buckled and Macroscopically Coiled Fibers for Ultra‐Stretchable Supercapacitors

Macroscopically coiled and microscopically buckled fiber electrodes are introduced for an ultra-stretchable supercapacitor. The pseudocapacitive MnO2-coated, solid-state, buckled coil supercapacitor provides superelasticity (400%–800%) and high linear, areal capacitances (4.8 mF cm−1 and 22.8 mF cm−2). Additionally, the capacitances of the supercapacitor decrease by less than 7.4% and 7% when stretched by 600% statically and dynamically, respectively. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.