Title:
SECONDARY BATTERY, ELECTRONIC DEVICE AND VEHICLE
Document Type and Number:
WIPO Patent Application WO/2022/090843
Kind Code:
A1
Abstract:
The present invention provides a lithium ion secondary battery which has high capacity and excellent charge and discharge cycle characteristics. The present invention provides a secondary battery which has high capacity. The present invention provides a secondary battery which has excellent charge and discharge characteristics. The present invention provides a secondary battery which is suppressed in decrease in the capacity even in cases where a state of charging at a high voltage is maintained for a long period of time. A secondary battery wherein: the surface layer part of each positive electrode active material particle is formed of lithium cobaltate which has an O3 structure after discharging after alternately repeating, in an environment at 60°C, a charging process, wherein constant current charging is performed to the voltage of 4.5 V at the current value of 0.5 C, and subsequently constant voltage charging is performed until the current value falls to 0.2 C, and a discharging process, wherein constant current discharging is performed to the voltage of 3 V at the current value of 0.5 C, 150 times or more; and the electrolyte comprises imidazolium cations.
Inventors:
KURIKI KAZUTAKA (JP)
YONEDA YUMIKO (JP)
SAGA SHIORI (JP)
ASADA YOSHIHARU (JP)
YAMAZAKI SHUNPEI (JP)
YONEDA YUMIKO (JP)
SAGA SHIORI (JP)
ASADA YOSHIHARU (JP)
YAMAZAKI SHUNPEI (JP)
Application Number:
PCT/IB2021/059381
Publication Date:
May 05, 2022
Filing Date:
October 13, 2021
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01M4/525; H01M4/587; H01M10/0568
Domestic Patent References:
| WO2020104881A1 | 2020-05-28 |
Foreign References:
| JP2016207641A | 2016-12-08 |
Other References:
YANO, AKIRA, SHIKANO, MASAHIRO, SAKAEBE, HIKARI: "[3A13] Surface crystal structure of LiCoO2 deintercalated down to O1 phase: Effect of oxide coating", PROCEEDINGS OF THE 60TH BATTERY SYMPOSIUM IN JAPAN, 22 October 2020 (2020-10-22)
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