Electrochromic salts, solutions, and devices
First Claim
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1. An electrolyte solution for an electrochromic device, comprising:
- (a) a molten salt solvent comprising at least one anion selected from the group consisting of bis(perfluoroethylsulfonyl)imide, and tris(trifluoromethylsulfonyl)methide;
(b) at least one reductant soluble in said molten salt solvent, wherein said reductant comprises at least one phenazine; and
(c) at least one oxidant soluble in said molten salt solvent, said oxidant having the chemical formula [A][B]2 wherein B is selected from the group consisting of bis(perfluoroethylsulfonyl)imide and tris(trifluoromethylsulfonyl)methide and wherein A is a dication having the structural formula
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Abstract
Electrochromic salts. Electrochromic salts of dicationic viologens such as methyl viologen and benzyl viologen associated with anions selected from bis(trifluoromethylsulfonyl)imide, bis(perfluoroethylsulfonyl)imide, and tris(trifluoromethylsulfonyl)methide are produced by metathesis with the corresponding viologen dihalide. They are highly soluble in molten quarternary ammonium salts and together with a suitable reductant provide electrolyte solutions that are used in electrochromic windows.
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Citations
20 Claims
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1. An electrolyte solution for an electrochromic device, comprising:
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(a) a molten salt solvent comprising at least one anion selected from the group consisting of bis(perfluoroethylsulfonyl)imide, and tris(trifluoromethylsulfonyl)methide; (b) at least one reductant soluble in said molten salt solvent, wherein said reductant comprises at least one phenazine; and (c) at least one oxidant soluble in said molten salt solvent, said oxidant having the chemical formula [A][B]2 wherein B is selected from the group consisting of bis(perfluoroethylsulfonyl)imide and tris(trifluoromethylsulfonyl)methide and wherein A is a dication having the structural formula - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrolyte solution prepared by dissolving at least one reductant and at least one electrochromic ionic compound into a molten salt, wherein reductamt comprises at least one phenazine, said molten salt comprising an anion selected from the group consisting of bis(perfluoroethylsulfonyl)imide and tris(trifluoromethylsulfonyl)methide, said electrochromic compound having the chemical formula
[A][B]2wherein B is selected from the group consisting of bis(perfluoroethylsulfonyl)imide and tris(trifluoromethylsulfonyl)methide and wherein A is a dication having the structural formula
Specification