Paper
5 March 2020 Dual-ion electrochromic battery with long lifetime based on dimethyl sulfoxide (DMSO)-nanocluster modified hydrogel electrolytes
Author Affiliations +
Proceedings Volume 11281, Oxide-based Materials and Devices XI; 1128126 (2020) https://doi.org/10.1117/12.2544020
Event: SPIE OPTO, 2020, San Francisco, California, United States
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.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric Hopmann, Haizeng Li, and Abdulhakem Y. Elezzabi "Dual-ion electrochromic battery with long lifetime based on dimethyl sulfoxide (DMSO)-nanocluster modified hydrogel electrolytes", Proc. SPIE 11281, Oxide-based Materials and Devices XI, 1128126 (5 March 2020); https://doi.org/10.1117/12.2544020
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KEYWORDS
Zinc

Electrodes

Aluminum

Potassium

Scanning electron microscopy

Ions

Oxides

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