Title:
SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2023/237967
Kind Code:
A1
Abstract:
Provided are a positive electrode active material and a secondary battery using same, wherein a decrease in discharge capacity during charge/discharge cycles is suppressed. Alternatively, provided is a highly safe secondary battery. The secondary battery has a positive electrode active material which has a lithium cobalt oxide containing nickel and magnesium, wherein the amount of nickel and magnesium detected in the surface layer of the positive electrode active material is greater than the amount of nickel and magnesium detected inside the positive electrode active material, and the distribution of nickel and the distribution of magnesium overlap in the surface layer of the positive electrode active material. It is preferable that the positive electrode active material further contains fluorine, and the amount of fluorine detected in the surface layer of the positive electrode active material is greater than the amount of fluorine detected inside the positive electrode active material.
Inventors:
YAMAZAKI SHUNPEI (JP)
MOMMA YOHEI (JP)
MURATSUBAKI SHOTARO (JP)
TAKAHASHI TATSUYOSHI (JP)
MIKAMI MAYUMI (JP)
SAITO JO (JP)
OCHIAI TERUAKI (JP)
KAWATSUKI ATSUSHI (JP)
MOMMA YOHEI (JP)
MURATSUBAKI SHOTARO (JP)
TAKAHASHI TATSUYOSHI (JP)
MIKAMI MAYUMI (JP)
SAITO JO (JP)
OCHIAI TERUAKI (JP)
KAWATSUKI ATSUSHI (JP)
Application Number:
PCT/IB2023/055549
Publication Date:
December 14, 2023
Filing Date:
May 31, 2023
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01M4/525; C01G53/00; H01M4/36; H01M10/052
Domestic Patent References:
| WO2008013208A1 | 2008-01-31 |
Foreign References:
| JP2018527718A | 2018-09-20 | |||
| JP2022071154A | 2022-05-13 |
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