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Adv Sci (Weinh). 2019 Jan 22;6(5):1801337. doi: 10.1002/advs.201801337. eCollection 2019 Mar 6.

Aligned Ionogel Electrolytes for High-Temperature Supercapacitors.

Author information

1
School of Chemical Science and Engineering Tongji University Shanghai 200092 P. R. China.
2
Dyson School of Design Engineering Imperial College London South Kensington London SW7 2AZ UK.
3
Earth Science and Engineering Imperial College London South Kensington London SW7 2AZ UK.
4
College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai 200090 P. R. China.
5
Mechanical Engineering Imperial College London South Kensington London SW7 2AZ UK.

Abstract

Ionogels are a new class of promising materials for use in all-solid-state energy storage devices in which they can function as an integrated separator and electrolyte. However, their performance is limited by the presence of a crosslinking polymer, which is needed to improve the mechanical properties, but compromises their ionic conductivity. Here, directional freezing is used followed by a solvent replacement method to prepare aligned nanocomposite ionogels which exhibit enhanced ionic conductivity, good mechanical strength, and thermal stability simultaneously. The aligned ionogel based supercapacitor achieves a 29% higher specific capacitance (176 F g-1 at 25 °C and 1 A g-1) than an equivalent nonaligned form. Notably, this thermally stable aligned ionogel has a high ionic conductivity of 22.1 mS cm-1 and achieves a high specific capacitance of 167 F g-1 at 10 A g-1 and 200 °C. Furthermore, the diffusion simulations conducted on 3D reconstructed tomography images are employed to explain the improved conductivity in the relevant direction of the aligned structure compared to the nonaligned. This work demonstrates the synthesis, analysis, and use of aligned ionogels as supercapacitor separators and electrolytes, representing a promising direction for the development of wearable electronics coupled with image based process and simulations.

KEYWORDS:

X‐ray tomography; aligned ionogels; supercapacitors; thermal tolerance; tortuosity factors

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