Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices

Flexible electrochromic devices (ECDs) based on Li-doped ion gels and tungsten trioxide (WO3) are demonstrated. Colored ECDs cannot be produced using conventional ion gels comprised of copolymers and room temperature ionic liquids (RTILs) due to a lack of cations that can be inserted into WO3. Based...

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Main Authors:	Tae Yong Yun, Xinlin Li, Jaehyun Bae, Se Hyun Kim, Hong Chul Moon
Format:	Article
Language:	English
Published:	Elsevier 2019-01-01
Series:	Materials & Design
Online Access:	http://www.sciencedirect.com/science/article/pii/S0264127518308220

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spelling	doaj-e6398db4cb0c44f9949432ebb48a84642020-11-25T01:02:31ZengElsevierMaterials & Design0264-12752019-01-011624551Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devicesTae Yong Yun0Xinlin Li1Jaehyun Bae2Se Hyun Kim3Hong Chul Moon4Department of Chemical Engineering, University of Seoul, Seoul 02504, Republic of KoreaDepartment of Mechanical Engineering Science, Yeungnam University, Gyeongsan, North Gyeongsang 38541, Republic of KoreaSchool of Chemical Engineering, Yeungnam University, Gyeongsan, North Gyeongsang 38541, Republic of KoreaDepartment of Mechanical Engineering Science, Yeungnam University, Gyeongsan, North Gyeongsang 38541, Republic of Korea; School of Chemical Engineering, Yeungnam University, Gyeongsan, North Gyeongsang 38541, Republic of Korea; Correspondence to: S.H. Kim, Department of Mechanical Engineering Science, Yeungnam University, Gyeongsan, North Gyeongsang 38541, Republic of Korea.Department of Chemical Engineering, University of Seoul, Seoul 02504, Republic of Korea; Correspondence to: H.C. Moon, Department of Chemical Engineering, University of Seoul, Seoul 02504, Republic of Korea.Flexible electrochromic devices (ECDs) based on Li-doped ion gels and tungsten trioxide (WO3) are demonstrated. Colored ECDs cannot be produced using conventional ion gels comprised of copolymers and room temperature ionic liquids (RTILs) due to a lack of cations that can be inserted into WO3. Based on considerations of the coloration mechanism, we developed Li-doped ion gels and applied these to devices. The effects of Li salt concentration are systematically examined, with respect to device dynamics, coloration efficiency, and transmittance contrast. In addition, the coloration/bleaching switching stability of the ECD produced using optimal Li salt content is investigated. The ECD exhibits distinct colored and bleached states even after 24 h operation in air. Using the described Li-doped ion gel electrolytes, flexible WO3 ECDs were successfully demonstrated with good bending stability and no electrolyte leakage. Keywords: Li-doped gels, Electrochromism, Flexible device, Tungsten oxidehttp://www.sciencedirect.com/science/article/pii/S0264127518308220
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Tae Yong Yun Xinlin Li Jaehyun Bae Se Hyun Kim Hong Chul Moon
spellingShingle	Tae Yong Yun Xinlin Li Jaehyun Bae Se Hyun Kim Hong Chul Moon Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices Materials & Design
author_facet	Tae Yong Yun Xinlin Li Jaehyun Bae Se Hyun Kim Hong Chul Moon
author_sort	Tae Yong Yun
title	Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices
title_short	Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices
title_full	Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices
title_fullStr	Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices
title_full_unstemmed	Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices
title_sort	non-volatile, li-doped ion gel electrolytes for flexible wo3-based electrochromic devices
publisher	Elsevier
series	Materials & Design
issn	0264-1275
publishDate	2019-01-01
description	Flexible electrochromic devices (ECDs) based on Li-doped ion gels and tungsten trioxide (WO3) are demonstrated. Colored ECDs cannot be produced using conventional ion gels comprised of copolymers and room temperature ionic liquids (RTILs) due to a lack of cations that can be inserted into WO3. Based on considerations of the coloration mechanism, we developed Li-doped ion gels and applied these to devices. The effects of Li salt concentration are systematically examined, with respect to device dynamics, coloration efficiency, and transmittance contrast. In addition, the coloration/bleaching switching stability of the ECD produced using optimal Li salt content is investigated. The ECD exhibits distinct colored and bleached states even after 24 h operation in air. Using the described Li-doped ion gel electrolytes, flexible WO3 ECDs were successfully demonstrated with good bending stability and no electrolyte leakage. Keywords: Li-doped gels, Electrochromism, Flexible device, Tungsten oxide
url	http://www.sciencedirect.com/science/article/pii/S0264127518308220
work_keys_str_mv	AT taeyongyun nonvolatilelidopediongelelectrolytesforflexiblewo3basedelectrochromicdevices AT xinlinli nonvolatilelidopediongelelectrolytesforflexiblewo3basedelectrochromicdevices AT jaehyunbae nonvolatilelidopediongelelectrolytesforflexiblewo3basedelectrochromicdevices AT sehyunkim nonvolatilelidopediongelelectrolytesforflexiblewo3basedelectrochromicdevices AT hongchulmoon nonvolatilelidopediongelelectrolytesforflexiblewo3basedelectrochromicdevices
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Non-volatile, Li-doped ion gel electrolytes for flexible WO3-based electrochromic devices

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