Title:
二次電池
Document Type and Number:
Japanese Patent JP7124885
Kind Code:
B2
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, versus a lithium reference electrode, of the negative electrode measured in a full charge state is higher than or equal to 19 mV and lower than or equal to 86 mV. The full charge state is a state in which the secondary battery is charged with a constant voltage of a closed circuit voltage of higher than or equal to 4.38 V for 24 hours. 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 a discharge capacity 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.
Inventors:
Keitaro Kitada
Dai Sato
Takaaki Matsui
Taichi Kogure
Aya Masuko
Yoshifumi Shimizu
Kazuki Honda
Hirano Yudai
Hataga Shinji
Naoko Yamakawa
Morio Okuno
Masayasu Miyamoto
Dai Sato
Takaaki Matsui
Taichi Kogure
Aya Masuko
Yoshifumi Shimizu
Kazuki Honda
Hirano Yudai
Hataga Shinji
Naoko Yamakawa
Morio Okuno
Masayasu Miyamoto
Application Number:
JP2020557850A
Publication Date:
August 24, 2022
Filing Date:
November 29, 2019
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H01M10/052; H01M4/13; H01M4/36; H01M4/505; H01M4/525; H01M4/587; H01M4/62; H01M10/0569; H01M10/0587; H01M50/417; H01M50/449
Domestic Patent References:
| JP2018166108A | ||||
| JP2017191662A | ||||
| JP2007048560A | ||||
| JP2006313719A | ||||
| JP2016170937A | ||||
| JP2002252028A |
Attorney, Agent or Firm:
Patent Attorney Corporation Tsubasa International Patent Office