Stretchable Carbon Nanotube/Ion–Gel Supercapacitors with High Durability Realized through Interfacial Microroughness

• DOI: 10.1021/am502953g
• Publication Date: 2014-07-28T22:07:30Z
• Authors: Jiho Lee; Wonbin Kim; Woong Kim
• Keywords: Delamination; Current collector

A critical problem with stretchable supercapacitors developed to date has been evaporation of a volatile component their electrolyte, causing failure. In this work, we demonstrated successful use an ionic-liquid-based nonvolatile gel (ion–gel) electrolyte in carbon nanotube (CNT)-based supercapacitors. The CNT/ion–gel showed high capacitance retention (96.6%) over 3000 stretch cycles at 20% strain. durability against was achieved by introducing microroughness the interfaces between different materials. produced simple process imprinting surface microstructure office paper onto poly(dimethylsiloxane) substrate; texture is reproduced successive current collector and CNT layers. Adhesion layers strengthened roughness prevented delamination repeated cycles. addition layer decreased sensitivity electrical characteristics stretching. Moreover, ion–gel increases operating voltage window (3 V) hence energy density. We believe our demonstration will greatly contribute development flexible and/or energy-storage devices durability.