Positive electrode active material, preparation method thereof, positive electrode plate, lithium-ion secondary battery as well as battery module, battery pack and apparatus containing lithium-ion secondary battery
US11417883B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2021 |
| Grant date | Aug 16, 2022 |
| Priority date | — |
| Expiry date | Dec 29, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present application discloses positive electrode active material, preparation method thereof, positive electrode plate, lithium-ion secondary battery and battery module, pack, and apparatus. The positive electrode active material includes a nickel-containing lithium composite oxide satisfying a chemical formula Li1+a[NixCoyMnzMb]O2, in the formula, M is a doping element at transition metal site, 0.5≤x<1, 0≤y<0.3, 0≤z<0.3, −0.1≤a<0.2, 0<b<0.3, x+y+z+b=1, wherein the positive electrode active material has a layered crystal structure and belongs to space group R3m; under the condition that the positive electrode active material is in 78% delithiation state, at least part of the doping elements M have a chemical valence of +3 or more, and surface oxygen of the positive electrode active material has an average valence state of VO satisfying −2.0≤VO≤−1.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.