US 11,990,640 B2
α-alumina, slurry, porous membrane, laminated separator, and nonaqueous electrolyte secondary battery and method for producing same
Tomomichi Nasu, Niihama (JP); Syunsuke Sakamoto, Niihama (JP); and Hirotaka Ozaki, Niihama (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/417,012
Filed by SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050452
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/138014, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-242924 (JP), filed on Dec. 26, 2018.
Prior Publication US 2022/0077541 A1, Mar. 10, 2022
Int. Cl. H01M 50/434 (2021.01); C01F 7/441 (2022.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01)
CPC H01M 50/434 (2021.01) [C01F 7/441 (2013.01); H01M 50/443 (2021.01); H01M 50/449 (2021.01); C01P 2002/60 (2013.01); C01P 2002/90 (2013.01); C01P 2004/61 (2013.01); C01P 2006/12 (2013.01); C01P 2006/40 (2013.01)] 11 Claims
 
1. An α-alumina wherein
a crystallite size obtained by a Rietveld analysis is not greater than 95 nm, and
a lattice strain obtained by the Rietveld analysis is not greater than 0.0020.