US 12,454,463 B2
Alumina, alumina slurry, alumina film, laminate separator, nonaqueous electrolyte secondary battery and manufacturing method thereof
Hirotaka Ozaki, Niihama (JP); Toyohisa Uda, Niihama (JP); and Hiroyuki Ando, Niihama (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/418,239
Filed by SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050592
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/138074, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-242482 (JP), filed on Dec. 26, 2018.
Prior Publication US 2022/0081309 A1, Mar. 17, 2022
Int. Cl. C01F 7/02 (2022.01); H01M 50/431 (2021.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01)
CPC C01F 7/02 (2013.01) [H01M 50/431 (2021.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); C01P 2006/12 (2013.01)] 10 Claims
OG exemplary drawing
 
1. Alumina having a water desorption index H defined by the following formula (1) of 0.15 or less in a water adsorption/desorption isotherm at 25° C.:
water desorption index H=(Vd0.5−Va0.5)÷Va0.9  (1)
where
Vd0.5 represents a water adsorption amount [mg/g] per 1 g of alumina in a desorption isotherm at a relative water vapor pressure of 0.5,
Va0.5 represents a water adsorption amount [mg/g] per 1 g of alumina in an adsorption isotherm at a relative water vapor pressure of 0.5, and
Va0.9 represents a water adsorption amount [mg/g] per 1 g of alumina in the adsorption isotherm at a relative water vapor pressure of 0.9,
wherein the alumina is α-alumina,
wherein the alumina has a 50% particle diameter D50 of 1.0 μm or less in the volume-based cumulative particle size distribution, and
wherein the alumina has a 90% particle diameter D90 of 2.0 μm or less in the volume-based cumulative particle size distribution.