Lithium nickel-manganese-cobalt oxide cathode powders for high voltage lithium-ion batteries
US11011747B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 20, 2016 |
| Grant date | May 18, 2021 |
| Priority date | — |
| Expiry date | Jan 28, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lithium metal oxide powder for a cathode material in a rechargeable battery, consisting of a core and a surface layer, the surface layer being delimited by an outer and an inner interface, the inner interface being in contact with the core, the core having a layered crystal structure comprising the elements Li, M and oxygen, wherein M has the formula M=(Niz (Ni1/2 Mn1/2)y Cox)1-k Ak, with 0.15≤x≤0.30, 0.20≤z≤0.55, x+y+z=1 and 0<k≤0.1, wherein the Li content is stoichiometrically controlled with a molar ratio 0.95≤Li:M≤1.10; wherein A is at least one dopant and comprises Al; wherein the core has an Al content of 0.3-3 mol % and a F content of less than 0.05 mol %; and wherein the surface layer has an Al content that increases continuously from the Al content of the core at the inner interface to at least 10 mol % at the outer interface, and a F content that increases continuously from less than 0.05 mol % at the inner interface to at least 3 mol % at the outer interface, the Al and F contents in the surface layer being determined by XPS. The surface layer may also have a Mn content that decreases continuously from the Mn content of the core at the inner interface, to less than 50%…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.