Invention Grant
- Patent Title: α-alumina, slurry, porous membrane, laminated separator, and nonaqueous electrolyte secondary battery and method for producing same
-
Application No.: US17417012Application Date: 2019-12-24
-
Publication No.: US11990640B2Publication Date: 2024-05-21
- Inventor: Tomomichi Nasu , Syunsuke Sakamoto , Hirotaka Ozaki
- Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
- Applicant Address: JP Tokyo
- Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
- Current Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JP 18242924 2018.12.26
- International Application: PCT/JP2019/050452 2019.12.24
- International Announcement: WO2020/138014A 2020.07.02
- Date entered country: 2021-06-21
- Main IPC: H01M50/434
- IPC: H01M50/434 ; C01F7/441 ; H01M50/443 ; H01M50/449

Abstract:
An object of the present invention is to provide an alumina used for a slurry for reducing unevenness in a surface of a porous membrane. The present invention is 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. A BET specific surface area by a nitrogen adsorption method of the α-alumina is preferably not greater than 10 m2/g. A particle diameter D50 equivalent to 50% cumulative percentage by volume of the α-alumina is also preferably not greater than 2 μm.
Public/Granted literature
Information query