Flexible, fiber-shaped supercapacitors with roll-type assembly.

Graphical abstract A fiber-shaped supercapacitor (FSC) with a unique roll-type configuration was developed by simply rolling up PANI-coated carbon fiber bundle electrodes and using a PVA–H 2 SO 4 gel electrolyte. The PANI/CF roll-type FSC exhibited better electrochemical performance than the PANI/CF twist-type FSC. Highlights • A new roll-type configuration was designed for fiber-shaped supercapacitors (FSCs). • The roll-type configuration maintains a short distance between the electrodes. • The roll-type FSC was simply fabricated by roll-up assembly. • The PANI/CF roll-type FSC exhibited high capacitance retention. • The roll-type FSC showed excellent mechanical stability. Abstract A fiber-shaped supercapacitor (FSC) with a unique roll-type configuration is developed by simply rolling polyaniline-coated carbon fiber bundle electrodes with an H 2 SO 4 /polyvinyl alcohol gel electrolyte. The roll-type polyaniline-coated carbon fibers FSC exhibits four times higher capacitance retention than the twist-type fiber-shaped supercapacitor and shows an energy density of 2.97 Wh kg⁻¹ at a power density of 4 kW kg⁻¹, which is almost three orders of magnitude higher than that of the twist-type FSC (0.004 Wh kg⁻¹). The enhanced performance of the roll-type FSC is attributable to its unique roll-type configuration, which creates a short and consistent distance between the electrodes. [ABSTRACT FROM AUTHOR]