Title:
SECONDARY BATTERY, MOBILE INFORMATION TERMINAL, VEHICLE, AND POSITIVE ELECTRODE ACTIVE MATERIAL PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/152428
Kind Code:
A1
Abstract:
Provided is a positive electrode active material that is not susceptible to deterioration. Also provided are positive electrode active material particles that is not susceptible to deterioration. Also provided is a power storage device that is not susceptible to deterioration. Also provided is a safe power storage device. Also provided is a novel power storage device. Specifically provided is a secondary battery comprising a positive electrode and a negative electrode, wherein: the positive electrode has a positive electrode active material; the positive electrode active material has crystals exhibiting a layered rock salt crystal structure; the crystals belong to the space group R-3m; the positive electrode active material is composed of particles that contain lithium, cobalt, titanium, magnesium, and oxygen; the magnesium concentration in a surface layer part of the particles is higher than the magnesium concentration in the interiors of the particles; and in the positive electrode active material, the titanium concentration in the surface layer part of the particles is higher than the titanium concentration in the interiors of the particles.
Inventors:
MOMMA YOHEI (JP)
KADOMA HIROSHI
KOMATSU YOSHIHIRO (JP)
SAGA SHIORI (JP)
YAMAZAKI SHUNPEI (JP)
KADOMA HIROSHI
KOMATSU YOSHIHIRO (JP)
SAGA SHIORI (JP)
YAMAZAKI SHUNPEI (JP)
Application Number:
PCT/IB2021/050437
Publication Date:
August 05, 2021
Filing Date:
January 21, 2021
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01M4/505; H01M4/525
Foreign References:
| US20160276658A1 | 2016-09-22 | |||
| JP2018195581A | 2018-12-06 | |||
| JP2014038828A | 2014-02-27 | |||
| JP2019509599A | 2019-04-04 | |||
| JP2018527718A | 2018-09-20 | |||
| JP2019179758A | 2019-10-17 |
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