Title:
SECONDARY BATTERY, ELECTRONIC DEVICE, AND VEHICLE
Document Type and Number:
WIPO Patent Application WO/2022/219456
Kind Code:
A1
Abstract:
The objective of the present invention is to provide a positive electrode active material having an improved discharge capacity retention ratio in a cycle characteristic. This secondary battery is provided with a positive electrode that is pressed with a linear pressure in a range of 100 kN/m to 3000 kN/m inclusive, and a negative electrode, wherein, when the positive electrode is used in a test battery of which the negative electrode consists of lithium, a cyclic test is performed by repeating a charge-discharge cycle 50 times, and a discharge capacity of the battery is measured in each cycle, the value of the discharge capacity measured in the 50th cycle lies in a range of at least 35% and less than 100% of the maximum value of the discharge capacity during all 50 cycles. In each charge-discharge cycle, performed in an environment at 25°C to 45°C inclusive, the test battery is charged with a constant current at a charging rate of 0.5 C (1 C=200 mA/g) to a voltage of 4.7 V, is then charged with a constant voltage of 4.7 V until the charging rate reaches 0.05 C, and is then discharged with a constant current at a discharging rate of 0.5 C to a voltage of 2.5 V.
Inventors:
SHIMADA KAZUYA (JP)
MOMMA YOHEI (JP)
FUKUSHIMA KUNIHIRO (JP)
KAWATSUKI ATSUSHI (JP)
MOMMA YOHEI (JP)
FUKUSHIMA KUNIHIRO (JP)
KAWATSUKI ATSUSHI (JP)
Application Number:
PCT/IB2022/053134
Publication Date:
October 20, 2022
Filing Date:
April 05, 2022
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01M4/13; H01M4/38; H01M4/525
Foreign References:
| JP2003272609A | 2003-09-26 | |||
| JP2018049836A | 2018-03-29 | |||
| JP2019046560A | 2019-03-22 |
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