Title:
SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2024/003663
Kind Code:
A1
Abstract:
Provided is a secondary battery which achieves both high safety and reduction in charging/discharging time. A secondary battery according to the present invention is of a winding type. In the secondary battery, a positive electrode current collector of a positive electrode has a first tab and a second tab, and a negative electrode current collector of a negative electrode has a third tab and a fourth tab. The first tab is located at a portion closer to the center of the winding as compared with the second tab, and the third tab is located at a portion closer to the center of the winding as compared with the fourth tab. The first tab and the second tab are joined at a first joining part, and the third tab and the fourth tab are joined at a second joining part. A positive electrode active material has a first region, and a second region located on the surface side of the positive electrode active material. The first region contains lithium, cobalt, and oxygen. The second region contains lithium, cobalt, magnesium, and oxygen.
Inventors:
YAMAZAKI SHUNPEI (JP)
JINBO YASUHIRO (JP)
WADA RIHITO (JP)
HIGA ASAKO (JP)
JINBO YASUHIRO (JP)
WADA RIHITO (JP)
HIGA ASAKO (JP)
Application Number:
PCT/IB2023/056238
Publication Date:
January 04, 2024
Filing Date:
June 16, 2023
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01M10/0587; H01G11/26; H01G11/46; H01G11/70; H01G11/74; H01M4/13; H01M4/131; H01M4/525; H01M10/052; H01M50/533; H01M50/538
Domestic Patent References:
| WO2011108106A1 | 2011-09-09 |
Foreign References:
| JP2022071154A | 2022-05-13 | |||
| JP2009043477A | 2009-02-26 | |||
| JP2011187193A | 2011-09-22 | |||
| CN101714624A | 2010-05-26 | |||
| JP2014167890A | 2014-09-11 | |||
| JP2010129471A | 2010-06-10 | |||
| JP2010118315A | 2010-05-27 |
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