Self-Assembly of Integrated Tubular Microsupercapacitors with Improved Electrochemical Performance and Self-Protective Function

Abstract

Inspired by origami art, we demonstrate a tubular microsupercapacitor (TMSC) by self-assembling two-dimensional (2D) films into a "swiss roll" structure with greatly reduced footprint area. A polymeric framework consisting of swelling hydrogel and polyimide layers ensures excellent ion transport between poly(3,4-ethylenedioxythiophene) (PEDOT)-based electrodes and provides efficient self-protection of the TMSC against external compression up to about 30 MPa. Such TMSCs exhibit an areal capacitance of 82.5 mF cm −2 at 0.3 mA cm −2 with a potential window of 0.8 V, an energy density and power density of 7.73 μWh cm −2 and 17.8 mW cm −2 (0.3 and 45 mA cm −2 ), and an improved cycling stability with a capacitance retention up to 96.6% over 5000 cycles. Furthermore, asfabricated TMSC arrays can be detached from their surface and transferred onto target substrates. The connection of devices in parallel/series greatly improves their capacity and voltage output. Overall, our prototype devices and fabrication methodology provide a promising route to create integratable microscale tubular energy storage devices with an efficient self-protection function and high performance for future miniaturized electronics.

3D‐Printed Stretchable Micro‐Supercapacitor with Remarkable Areal Performance

“…Micro‐supercapacitor (MSC) has gained great attention as an advanced on‐board energy storage system due in part to 1) its in‐plane interdigital configuration that is facilely integrated into wearable on‐chip electronics and integrated circuits, and 2) its outstanding electrochemical performance, such as short response time, long cycling life, fast rate capability, and high power delivery . Moreover, along with the growing demand for miniaturized wearable electronics, a great deal of effort had been devoted to introduce smart functions, such as self‐healing, electrochromism, shape memory, photodetection, thermal responsibility, and stretchability, into the intelligent miniaturized electronics, which exhibited great promise in the future applications of personal healthcare, modern optoelectronics, artificial intelligence, and so on . In order to be utilized in real wearable and intelligent miniaturized electronic applications, the areal electrochemical properties (performance normalized by surface area) for MSCs are more important than the volumetric characteristics due to the limited footprint area available on chips .…”

Self‐Healing Materials for Energy‐Storage Devices

“…For example, the self‐protective MSC with a polymeric framework consisting of swelling hydrogel and polyimide layers have been designed. [ 168 ] A self‐healable MSC was prepared by assembling the ice‐templated 3D MXene‐rGO composite aerogels with the PVA/H 2 SO 4 gel electrolyte and the self‐healing CPU shell (Figure 13c). The MSC exhibited a capacity retention of 81.7% after five cutting–healing cycles.…”

Recent Advances in Design of Flexible Electrodes for Miniaturized Supercapacitors

“… By varying the 2D pattern and origami design, they successfully realized the integration of a foldable system that can be applied in multifunctional electronics such as energy harvesting, gas sensing, and energy storage. Also inspired by origami, Want et al demonstrated tubular MSCs based on rolled‐up technology . The PEDOT electrodes were self‐assembled into a “swiss roll” structure, and hydrogel frameworks were wrapped around the electrodes ensuring excellent ion transport.…”