The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 2025
Filed:
Aug. 04, 2021
Murata Manufacturing Co., Ltd., Kyoto, JP;
Atsushi Ouki, Tokyo, JP;
Susumu Endo, Tokyo, JP;
Shinji Hayazaki, Tokyo, JP;
Sho Takahashi, Tokyo, JP;
Takashige Fujikawa, Tokyo, JP;
Masaki Kuratsuka, Tokyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A positive electrode active material for a secondary battery includes a center part and a covering part. The center part includes a layered rock-salt lithium-nickel composite oxide. The covering part covers a surface of the center part and includes a boron compound. The positive electrode active material has a crystallite size of a (104) plane that is greater than or equal to 40.0 nm and less than or equal to 74.5 nm. The crystallite size is calculated by X-ray diffractometry and Scherrer equation. The positive electrode active material has a specific surface area that satisfies a condition represented by −0.0160×Z+1.72≤A≤−0.0324×Z+2.94 where Z is the crystallite size (nm), and A is the specific surface area (m/g). The specific surface area is measured by BET specific surface area measurement method.