Suchergebnisse

© 2017 The Authors. Flexible and stretchable supercapacitors have a big potential of being used in portable and wearable electronics because of their high power density, high reversibility, fast charge/discharge rates and long life cycles. In this study, strip supercapacitors were fabricated by a blade coating process using low-cost materials. The electrochemical performance of the strip supercapacitors was studied under both static and dynamic tensile stress conditions in order to evaluate their suitability for use in wearable textiles. The results showed strip supercapacitors under static and dynamic mechanical tensile process worked well: the capacitance and specific capacitance for this strip supercapacitor sample with the static loading of 100 N or 200 N was bigger than that of this sample without loading, with an increase of 22% and 9%, respectively. The mechanical compression was applied vertically from the top of the strip supercapacitor sample to further investigate the reason for the capacitance increase under loading conditions. ; European Union Seventh Framework Programme (FP7/2007-2013) grant agreement no. 281063.

© 2016 The Authors. In recent years, much effort has been spent developing thin, lightweight and flexible energy storage devices to meet the various requirements of modern smart electronics. In this work, thin strip supercapacitors were successfully developed using activated carbon as the active electrode material. The electrochemical performance of these strip supercapacitors has been studied under mechanical bending conditions. The results indicate that the strip supercapacitor was functional under bending conditions between the bending angles of 30° to 150°. The capacitance of the sample was still about 70% of the original capacitance at different bending angles. This suggests the strip supercapacitor developed has a reasonable flexibility. Simulation model of equivalent circuit was established to analyze the charge transfer resistance (CTR) and equivalent series resistance (ESR) results in electrochemical impedance spectroscopy (EIS) testing. The correlation between the capacitance and the resistance of the strip supercapacitor under bending conditions was investigated and obtained. ; The European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 281063