Electrochromic devices and methods
View Patent ↗A heat treated electrochromic device comprising an anodic complementary counter electrode layer comprised of a mixed tungsten-nickel oxide and lithium, which provides a high transmission in the fully intercalated state and which is capable of long term stability, is disclosed. Methods of making an electrochromic device comprising an anodic complementary counter electrode comprised of a mixed tungsten-nickel oxide are also disclosed.
1. A heat treated electrochromic device comprising:
a) a first electrode comprising one of a cathodic electrochromic layer or an anodic counter electrode layer,
b) a second electrode comprising the other of said cathodic electrochromic layer or said anodic counter electrode layer,
c) an ion-conductor layer for conducting ions between said first and second electrodes,
d) a first conductive layer, and
e) a second conductive layer,
said first and second electrodes and said ion-conductor layer being sandwiched between said first and second conductive layers,
said anodic counter electrode layer comprising lithium and a mixed tungsten-nickel oxide substantially in crystalline form, and
wherein the amount of nickel in said mixed tungsten-nickel oxide ranges from 15% to 90% by weight of said mixed tungsten-nickel oxide.
2. The electrochromic device of claim 1 , wherein said amount ranges from about 30% to about 70% by weight of said mixed tungsten-nickel oxide.
3. The electrochromic device of claim 2 , wherein said amount ranges from about 40% to about 60% by weight of said mixed tungsten-nickel oxide.
4. The electrochromic device of claim 1 , wherein said cathodic electrochromic layer comprises a metal oxide.
5. The electrochromic device of claim 4 , wherein said metal oxide is selected from the group consisting of tungsten oxide, vanadium oxide, molybdenum oxide, niobium oxide, titanium oxide, copper oxide, iridium oxide, chromium oxide, and manganese oxide.
6. The electrochromic device of claim 4 , wherein said metal oxide is doped with one or more metals.
7. The electrochromic device of claim 1 , wherein said first and second conductive layers comprise a metal oxide.
8. The electrochromic device of claim 7 , wherein said metal oxide is selected from the group consisting of indium oxide, tin oxide, zinc oxide, and ruthenium oxide.
9. The electrochromic device of claim 7 , wherein said metal oxide is doped with one or more metals.
10. The electrochromic device of claim 7 , wherein said conductive layers comprise the same metal oxide.
11. The electrochromic device of claim 7 , wherein said conductive layers comprise different metal oxides.
12. The electrochromatic device of claim 1 , wherein said first and second conductive layers comprise a substantially transparent coating of a transition metal.
13. The electrochromic device of claim 1 , wherein said ion conductor layer comprises a lithium-ion conducting layer.
14. The electrochromic device of claim 13 , wherein said lithium-ion conducting layer comprises a material selected from the groups consisting of silicates, silicon oxides, and borates.
15. The electrochromic device of claim 1 , disposed on a substrate selected from the group consisting of glass or plastic.
16. The electrochromic device of claim 1 , wherein said anodic counter electrode has a substantially uniform thickness ranging from about 500 Angstroms to about 6500 Angstroms.
17. The electrochromic device of claim 16 , wherein said thickness ranges from about 1500 Angstroms to about 2500 Angstroms.
18. A heat treated electrochromic device comprising:
a) a first electrode comprising one of a cathodic electrochromic layer or an anodic counter electrode layer,
b) a second electrode comprising the other of said cathodic electrochromic layer or said anodic counter electrode layer,
c) a lithium ion-conducting layer for conducting ions between said first and second electrodes, wherein said lithium ion-conducting layer comprises material selected from the group consisting of silicates, silicon oxides, and borates,
d) a first conductive layer, and
e) a second conductive layer,
said first and second electrodes and said ion-conductor layer being sandwiched between said first and second conductive layers, and
said anodic counter electrode layer comprising lithium and a mixed tungsten-nickel oxide substantially in crystalline form.
19. The heat treated electrochromic device of claim 18 , wherein an amount of nickel in said tungsten-nickel oxide ranges from about 15% to about 90% by weight of said mixed tungsten-nickel oxide.
20. A heat treated electrochromic device comprising:
a) a first electrode comprising one of a cathodic electrochromic layer or an anodic counter electrode layer,
b) a second electrode comprising the other of said cathodic electrochromic layer or said anodic counter electrode layer,
c) an ion-conductor layer for conducting ions between said first and second electrodes,
d) a first conductive layer containing a first metal oxide, and
e) a second conductive layer containing a second metal oxide, wherein said first and second metal oxides are different,
said first and second electrodes and said ion-conductor layer being sandwiched between said first and second conductive layers, and
said anodic counter electrode layer comprising lithium and a mixed tungsten-nickel oxide substantially in crystalline form.
21. The heat treated electrochromic device of claim 20 , wherein an amount of nickel in said tungsten-nickel oxide ranges from about 15% to about 90% by weight of said mixed tungsten-nickel oxide.