Electrochromic cells with improved electrolyte system
First Claim
1. In an electrochromic device comprising a polymeric current-carrier-permeable layer in ion-conductive contact with a layer of persistent electrochromic inorganic oxide with both of said layers disposed between electrode layers and means for alternately applying electric fields of opposite polarity across said electrodes for changing the coloration in said electrochromic layer, the improvement wherein said current-carrier-permeable layer comprises a layer of polymeric electrolyte consisting of poly(2-acrylamido-2-methylpropane sulfonic acid) homopolymer with water.
0 Assignments
0 Petitions
Accused Products
Abstract
Electrochromic devices are described having a layer of electrochromic material, e.g. WO3, in contact with a layer of organic electrolyte resin, with electrode means for changing electrochromic properties of the device by electric field means. The electrolyte resin layer comprises a hydrophilic layer of homopolymer of poly(2-acrylamido-2-methylpropane sulfonic acid) and in some preferred embodiments may further comprise a thinner layer of less hydrophilic electrolyte resin between the homopolymer and electrochromic layers.
39 Citations
10 Claims
- 1. In an electrochromic device comprising a polymeric current-carrier-permeable layer in ion-conductive contact with a layer of persistent electrochromic inorganic oxide with both of said layers disposed between electrode layers and means for alternately applying electric fields of opposite polarity across said electrodes for changing the coloration in said electrochromic layer, the improvement wherein said current-carrier-permeable layer comprises a layer of polymeric electrolyte consisting of poly(2-acrylamido-2-methylpropane sulfonic acid) homopolymer with water.
- 9. In an electrochromic device comprising a polymeric current-carrier-permeable layer in ion-conductive contact with a layer of persistent electrochromic inorganic oxide with both of said layers disposed between electrode layers and means for alternately applying electric fields of opposite polarity across said electrodes for changing the coloration in said electrochromic layer, the improvement wherein said current-carrier-permeable layer consists of at least two ion-conductive polymer layers, a first layer of hydrophilic polymer with water and a second and thinner layer of another polymeric electrolyte less hydrophilic than said first layer with said second layer disposed between said first layer and the defined electrochromic layer.
Specification