High-Performance Flexible Supercapacitors Based on Hair Fiber-Shaped Electrode

Abstract

In order to meet the new demand of wearable/stretchable electronic devices, supercapacitors, especially the fiber-shaped supercapacitors, have caused consideration attention. However, it is still a huge challenge to construct the fiber-shaped supercapacitors with outstanding performances at this stage. Meanwhile, the current performance of fiber-shaped supercapacitors is still not satisfactory such as low energy density, poor cycle stability, and poor cycle stability. To address these issues, we designed and constructed a flexible all-solid-state asymmetric supercapacitor with human hair/Ni/Graphene/MnO 2 fiber as positive electrode and human hair/Ni/Graphene fiber as negative electrode. Excitingly, the resulting supercapacitors displayed large potential window up to 1.8 V, excellent rate capability, fast frequency response capability (With short relaxation time constant of 55 ms), high volumetric energy density, and long cycle stability (more than 90% retention after 10000 cycles). The method presented here not only provides a reference for the design of flexible supercapacitors, but also paves a new way for the preparation of other energy storage devices.