Aligned lonogel electrolytes for high‐temperature supercapacitors

Title: Aligned lonogel electrolytes for high‐temperature supercapacitors
Authors: Liu, X
Taiwo, O
Yin, C
Ouyang, M
Chowdhury, R
Wang, B
Wang, H
Wu, B
Brandon, N
Wang, Q
Cooper, S
Item Type: Journal Article
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.
Issue Date: 22-Jan-2019
Date of Acceptance: 19-Nov-2018
URI: http://hdl.handle.net/10044/1/66470
DOI: https://dx.doi.org/10.1002/advs.201801337
ISSN: 2198-3844
Publisher: Wiley Open Access
Journal / Book Title: Advanced Science
Copyright Statement: © 2018 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Innovate UK
Funder's Grant Number: EP/K002252/1
EP/L019469/1
J15119 - PO:500174140
133376
Publication Status: Published online
Open Access location: https://onlinelibrary.wiley.com/doi/full/10.1002/advs.201801337
Online Publication Date: 2019-01-22
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Dyson School of Design Engineering



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