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Proceedings Paper

Dual-ion electrochromic battery with long lifetime based on dimethyl sulfoxide (DMSO)-nanocluster modified hydrogel electrolytes
Author(s): Eric Hopmann; Haizeng Li; Abdulhakem Y. Elezzabi
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Paper Abstract

For application in flexible, electrochromic batteries, transparent, highly conductive and long lifetime electrolytes are necessary to achieve fast coloration and a maximum contrast. Based on a dimethyl-sulfoxide (DMSO) modified polyacrylamide (PAM) hydrogel, we developed a dual-ion Zn2+/Al3+ electrochromic battery consisting of a Zn anode and WO3 cathode. To overcome shortcomings of conventional hydrogel electrolytes, which experience low solvent retention, we introduce a DMSO:H2O mixed solvent polymerization process, which significantly increases the electrolyte retention of the hydrogel and therefore its lifetime for ionic conduction. The DMSO-modified electrolyte exhibits ionic conductivities up to 27 mS/cm at room temperature, while the formation of DMSO:H2O nanoclusters enables ionic conduction even at temperatures as low as -15°C and retention of ionic conduction over more than 28 days. The electrochromic battery based on the modified hydrogel exhibits a specific charge capacity of 16.9 μAh/cm2 at current densities of 200 μA/cm2 with 100% coulombic efficiency retention over 200 charge-discharge cycles. Based on a double layer architecture, the flexible battery shows a contrast of over 80% trough electrochromic coloration.

Paper Details

Date Published: 5 March 2020
PDF: 7 pages
Proc. SPIE 11281, Oxide-based Materials and Devices XI, 1128126 (5 March 2020); doi: 10.1117/12.2544020
Show Author Affiliations
Eric Hopmann, Univ. of Alberta (Canada)
Haizeng Li, Univ. of Alberta (Canada)
Abdulhakem Y. Elezzabi, Univ. of Alberta (Canada)

Published in SPIE Proceedings Vol. 11281:
Oxide-based Materials and Devices XI
David J. Rogers; David C. Look; Ferechteh H. Teherani, Editor(s)

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