Positive electrode active material for nonaqueous electrolyte secondary battery, method for producing same, and nonaqueous electrolyte secondary battery
US11430990B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2017 |
| Grant date | Aug 30, 2022 |
| Priority date | — |
| Expiry date | Jan 11, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided are a positive electrode active material with which a secondary battery having high charging and discharging capacities and an excellent cycle characteristic can be obtained, and a method for producing the same. A positive electrode active material for a nonaqueous electrolyte secondary battery includes a lithium-metal composite oxide represented by a general formula: LiaNixCoyMnzMtO2+α and containing a secondary particle formed of a plurality of flocculated primary particles. A void ratio obtained from an image analysis result of a cross section of the secondary particle, the image thereof being obtained by a scanning electron microscope, is at least 5% and up to 50% in a first area that is from a central part of the secondary particle to one half of a radius of the secondary particle, and is up to 1.5% in a second area that is outside the first area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.