TUNGSTEN OXIDE POWDER SLURRY, METHOD OF PRODUCING THE SAME, AND METHOD OF PRODUCING AN ELECTROCHROMIC DEVICE USING THE SAME
According to one embodiment, provided is a tungsten oxide powder slurry in which a tungsten oxide powder and an aqueous solvent are mixed. D 50 is 20 nm to 10000 nm and D 90 is 100000 nm or less in a particle size cumulative graph of the tungsten oxide powder in the slurry. According to X-ray diffraction, a half-value width of a most intense peak detected at 29°±1° is 2° or less.
1 . A tungsten oxide powder slurry comprising:
a tungsten oxide powder; and
an aqueous solvent,
D 50 being 20 nm to 10000 nm and D 90 being 100000 nm or less in a particle size cumulative graph of the tungsten oxide powder in the slurry, and
a half-value width of a most intense peak detected at 29°±1° being 2° or less according to X-ray diffraction.
2 . The tungsten oxide powder slurry according to claim 1 , wherein D 50 is 500 nm or less, and D 90 is 1000 nm or less.
3 . The tungsten oxide powder slurry according to claim 1 , wherein a particle size frequency graph of the tungsten oxide powder has one peak within a range of Do to D 90 .
4 . The tungsten oxide powder slurry according to claim 2 , wherein a particle size frequency graph of the tungsten oxide powder has one peak within a range of Do to D 90 .
5 . The tungsten oxide powder slurry according to claim 1 , wherein a content of the tungsten oxide powder in the slurry is within a range of 5% by mass to 50% by mass.
6 . The tungsten oxide powder slurry according to claim 3 , wherein a content of the tungsten oxide powder in the slurry is within a range of 5% by mass to 50% by mass.
7 . The tungsten oxide powder slurry according to claim 1 , comprising one or more selected from ammonia, potassium hydroxide, or sodium hydroxide.
8 . The tungsten oxide powder slurry according to claim 3 , comprising one or more selected from ammonia, potassium hydroxide, or sodium hydroxide.
9 . The tungsten oxide powder slurry according to claim 1 , wherein the tungsten oxide powder without the aqueous solvent has an average particle size of 20 nm or less.
10 . The tungsten oxide powder slurry according to claim 3 , wherein the tungsten oxide powder without the aqueous solvent has an average particle size of 20 nm or less.
11 . The tungsten oxide powder slurry according to claim 1 , comprising a tungsten oxide powder comprising 0.01% by mass to 50% by mass of any one or more of potassium, sodium, lithium, or magnesium.
12 . The tungsten oxide powder slurry according to claim 1 , wherein an absorbance at a wavelength of 600 nm is 1 or less.
13 . The tungsten oxide powder slurry according to claim 6 , wherein an absorbance at a wavelength of 600 nm is 1 or less.
14 . The tungsten oxide powder slurry according to claim 1 , wherein a ratio, absorbance at wavelength 350 nm/absorbance at wavelength 600 nm, is 3 or more.
15 . The tungsten oxide powder slurry according to claim 12 , wherein a ratio, absorbance at wavelength 350 nm/absorbance at wavelength 600 nm, is 3 or more.
16 . A slurry for producing an electrochromic device, the slurry comprising the tungsten oxide powder slurry according to claim 1 .
17 . A method of producing an electrochromic device, the tungsten oxide powder slurry according to claim 1 being used to produce the electrochromic device.
18 . A method of producing the tungsten oxide powder slurry according to claim 1 , the method comprising:
grinding the tungsten oxide powder with a bead mill using beads having a particle size of 0.05 mm to 0.5 mm; and
mixing the ground tungsten oxide powder with the aqueous solvent.
19 . The method of producing the tungsten oxide powder slurry according to claim 18 , wherein each of the beads contains 50% by mass or more of zirconium oxide.