Electrochromic device with an electrolyte comprising a lithium s

Details Electrochromic device with an electrolyte comprising a lithium s Electrochromic device with an electrolyte comprising a lithium s

1990-03-28

1992-03-24

Hille, Rolf

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359272, G02F 1153

Patent

active

050993569

ABSTRACT:
The invention relates to an electrochromic (EC) device having oppositely arranged two EC electrode layers. The first EC electrode layer uses Prussian blue, osmium purple or ruthenium purple and accordingly takes on a characteristic color by electrochemical oxidation, and the second EC electrode layer uses a transition metal oxide which takes on a characteristic color by electrochemical reduction, such as WO.sub.3. The space between the two EC electrode layers is filled with an electrolyte solution. When an EC device of this type is left in the bleached state for some period of time and then driven for coloration, the density of coloration is insufficient because of a decrease in the quantity of electricity in the oxidizing and coloring reaction of the first EC electrode layer. The invention solves this problem by using, as the electrolyte solution, a solution of a lithium salt and a sodium salt in an organic solvent prepared such that Na.sup.+ ion amounts to 3-30 mol % of the total of Li.sup.+ ion and Na.sup.+ ion.

REFERENCES:
patent: 4726664 (1988-02-01), Tada et al.
patent: 4750816 (1988-06-01), Ito et al.
patent: 4801195 (1989-01-01), Kawai et al.
patent: 4958917 (1990-09-01), Hashimoto et al.
Japanese Abstract 60-257429 A.

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