“All-in-Gel” design for supercapacitors towards solid-state energy devices with thermal and mechanical compliance

Ionogels are semi-solid, ion conductive and mechanically compliant materials that hold promise for flexible, shape-conformable and all-solid-state energy storage devices. However, identifying facile routes for manufacturing ionogels into devices with highly resilient electrode/electrolyte interfaces...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (15), p.8826-8831
Main Authors: Yin, Chengyao, Liu, Xinhua, Wei, Junjie, Tan, Rui, Zhou, Jie, Ouyang, Mengzheng, Wang, Huizhi, Cooper, Samuel J., Wu, Billy, George, Chandramohan, Wang, Qigang
Format: Article
Language:English
Subjects:
Capacitance
Composite materials
Current carriers
Current density
Electrodes
Electrolytes
Energy storage
Interfaces
Ion currents
Ionic liquids
Ions
Mechanical properties
Operating temperature
Semisolids
Solid state
Strain
Supercapacitors
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Summary:Ionogels are semi-solid, ion conductive and mechanically compliant materials that hold promise for flexible, shape-conformable and all-solid-state energy storage devices. However, identifying facile routes for manufacturing ionogels into devices with highly resilient electrode/electrolyte interfaces remains a challenge. Here we present a novel all-in-gel supercapacitor consisting of an ionogel composite electrolyte and bucky gel electrodes processed using a one-step method. Compared with the mechanical properties and ionic conductivities of pure ionogels, our composite ionogels offer enhanced self-recovery (retaining 78% of mechanical robustness after 300 cycles at 60% strain) and a high ionic conductivity of 8.7 mS cm −1 , which is attributed to the robust amorphous polymer phase that enables facile permeation of ionic liquids, facilitating effective diffusion of charge carriers. We show that development of a supercapacitor with these gel electrodes and electrolytes significantly improves the interfacial contact between electrodes and electrolyte, yielding an area specific capacitance of 43 mF cm −2 at a current density of 1.0 mA cm −2 . Additionally, through this all-in-gel design a supercapacitor can achieve a capacitance between 22–81 mF cm −2 over a wide operating temperature range of −40 °C to 100 °C at a current density of 0.2 mA cm −2 .
ISSN:2050-7488
2050-7496
DOI:10.1039/C9TA01155B