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:
Aug. 13, 2024
Filed:
May. 04, 2021
Murata Manufacturing Co., Ltd., Kyoto, JP;
Keitaro Kitada, Kyoto, JP;
Futoshi Sato, Kyoto, JP;
Takaaki Matsui, Kyoto, JP;
Taichi Kogure, Kyoto, JP;
Aya Mashiko, Kyoto, JP;
Yoshifumi Shimizu, Kyoto, JP;
Kazuki Honda, Kyoto, JP;
Yuta Hirano, Kyoto, JP;
Shinji Hatake, Kyoto, JP;
Naoko Yamakawa, Kyoto, JP;
Moriaki Okuno, Kyoto, JP;
Masahiro Miyamoto, 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 lithium-cobalt composite oxide having a layered rock-salt crystal structure. The negative electrode includes graphite. An open circuit potential of the negative electrode measured in a full charge state is from 19 mV to 86 mV. A potential variation of the negative electrode is greater than or equal to 1 mV when the secondary battery is discharged from the full charge state by a capacity corresponding to 1% of a maximum discharge capacity. The maximum discharge capacity is obtained when the secondary battery is discharged with a constant current from the full charge state until the closed circuit voltage reaches 3.00 V, following which the secondary battery is discharged with a constant voltage of the closed circuit voltage of 3.00 V for 24 hours.