Electrochromic multi-layer devices with cross-linked ion conducting polymer

Abstract

Multi-layer electrochromic structures, and processes for assembling such structures, incorporating a cross-linked ion conducting polymer layer that maintains high adhesive and cohesive strength in combination with high ionic conductivity for an extended period of time, the ion conducting polymer layer characterized by electrochemical stability at voltages between about 1.3 V and about 4.4 V relative to lithium, lithium ion conductivity of at least about 10 −5 s/cm, and lap shear strength of at least 100 kPa, as measured at 1.27 mm/min in accordance with ASTM International standard D1002 or D3163.

What is claimed is: 
     
         1 . An ion conducting polymer feedstock material comprising:
 a cross-linkable ion conducting polymer comprising from about 5 wt. % to about 50 wt. % of the feedstock material;   a cross-linking catalyst comprising an ionizable charge carrier;   a moisture reduction additive; and   a plasticizer.   
     
     
         2 . The ion conducting polymer feedstock material of  claim 1 , wherein the ion conducting polymer comprises a mixture of monomers and oligomers. 
     
     
         3 . The ion conducting polymer feedstock material of  claim 2 , wherein the monomers comprise at least one functional group selected from the group of epoxy, hydroxyl, carbonyl, sulfonyl, ethylene, styrene, vinyl, isocyanate, and acrylate. 
     
     
         4 . The ion conducting polymer feedstock material of  claim 2 , wherein the monomers comprise epoxide monomers wherein the epoxide monomers are selected from the group consisting of: bis[1-ethyl(3-oxetanyl)]methyl ether, bisphenol-A diglycidyl ether, diglycidyl 1,2-cyclohexanedicarboxylate, 1,4-cyclohexanedimethanol diglycidyl ether, pentaerythritol tetraglycidyl ether, trimethylolpropane triglycidylether, and butanediol diglycidyl ether. 
     
     
         5 . The ion conducting polymer feedstock material of  claim 1 , wherein the plasticizer is selected from the group of sulfolane, 3-methyl sulfolane, propylene carbonate, ethylene carbonate, polyethylene glycol dimethyl ether, and polyethylene glycol methyl ether methacrylate. 
     
     
         6 . The ion conducting polymer feedstock material of  claim 1 , wherein the ion conducting polymer feedstock material further comprises a viscosity-increasing agent selected from the group of cellulose, cellulose acetate, cellulose triacetate, cellulose propionate acetate, or ethyl cellulose. 
     
     
         7 . The ion conducting polymer feedstock material of  claim 1 , wherein the ionizable charge carrier comprises one of a Lewis acid or a Brönsted acid. 
     
     
         8 . The ion conducting polymer feedstock material of  claim 1 , wherein the ionizable charge carrier comprises one of a lithium ion source, a sodium ion source, a potassium ion source, or a proton source. 
     
     
         9 . The ion conducting polymer feedstock material of  claim 1 , wherein the ionizable charge carrier comprises a lithium salt. 
     
     
         10 . The ion conducting polymer feedstock material of  claim 9 , wherein the lithium salt comprises LiTFSI (lithium bis(trifluoromethane) sulfonimide), LiBF 4  (lithium tetrafluoroborate), LiAsF 6  (lithium hexafluoro arsenate), LiCF 3 SO 3  (lithium trifluoromethane sulfonate), and LiClO 4  (lithium perchlorate).