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:
Dec. 24, 2024
Filed:
May. 28, 2021
Murata Manufacturing Co., Ltd., Kyoto, JP;
Takaaki Matsui, Kyoto, JP;
Futoshi Sato, Kyoto, JP;
Keitaro Kitada, Kyoto, JP;
Taichi Katsumoto, Kyoto, JP;
Takuma Kawahara, Kyoto, JP;
Yuta Hirano, Kyoto, JP;
Taichi Kogure, Kyoto, JP;
Kazuki Honda, Kyoto, JP;
Shinji Hatake, Kyoto, JP;
Takashi Sato, Kyoto, JP;
Naoko Yamakawa, Kyoto, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a positive electrode active material layer including a lithium-cobalt composite oxide. The lithium-cobalt composite oxide has a layered rock-salt crystal structure. The negative electrode includes a negative electrode active material layer including graphite. When the secondary battery is charged and discharged with an upper limit of a closed circuit voltage being set to 4.42 V or higher, a unit capacity (mAh/g) satisfies a condition represented by 168 mAh/g≤unit capacity (mAh/g)≤(−0.28×area rate (%)+178) mAh/g.