Development of gel polymer electrolyte forelectrochromic devices

• Main Authors: Kuo-Yu Huang, 黃國瑜
• Other Authors: Ying-Chung Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/42839745072227103918

碩士 === 國立中山大學 === 電機工程學系研究所 === 101 === In this study, the gel polymer electrolyte was fabricated by using propylene carbonate (PC), ethylene carbonate (EC), lithium perchlorate (LiClO4), plasticiser (D-600) (dithylene glycol monobutyl ether and adipic acid mixture) and polyvinyl butyral (PVB). The optical and physical properties of the gel polymer electrolyte were investigated. And the gel polymer electrolyte was applied to the WO3-NiO complementary electrochromic device (CECD). The electrochromic properties of CECD were investigated. Experimental results reveal that the liquid electrolyte can be obtained using PC, 40 wt.% EC with 8 wt.%LiClO4 and adding 30 wt.% D-600. And the gel polymer electrolyte can be obtained using liquid electrolyte and PVB in a weight ratio of 2:1. The gel polymer electrolyte exhibited a transmittance of 89.56% (λ@550 nm), an ionic conductivity of 1.63×10-4 S/cm (@RT), a withstanding voltage of 3 V； a weight loss of 5% at 100℃ environment, and the Li+ ions were completely dissociated form. The gel polymer electrolyte was applied to the CECD. The better electrochromic CECD biased with a colored voltage of -1.8 V exhibited a colored transmittance of 18.72%, a transmittance change (△T%) of 45.22%, an optical density change (△OD) of 0.53, an intercalation charge (Q) of 7.30 mC/cm2 and a coloration efficiency (η) of 74.40 cm2/C at a wavelength (λ) of 550 nm. Besides, the transmittance of colored state rised to 24.77% after 24 h without biased voltage supply. The CECD showed a well memory effect. The response time of the CECD was found to be about 10 s for colored and bleached state. The CECD exhibited a transmittance change (△T%) of 30.10% after 1000 cycles.