Doped lithium transition metal oxides containing sulfur
US8303855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2008 |
| Grant date | Nov 6, 2012 |
| Priority date | — |
| Expiry date | May 13, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention covers a powderous lithium transition metal oxide having a layered crystal structure Li1+aM1−aO2+bM′k Sm with −0.03<a<0.06, b≅0, M being a transition metal compound, consisting of at least 95% of either one or more elements of the group Ni, Mn, Co and Ti; M′ being present on the surface of the powderous oxide, and consisting of either one or more elements from (IUPAC) of the Periodic Table, each of said Group 2, 3, or 4 elements having an ionic radius between 0.7 and 1.2 Angstrom, M′ however not comprising Ti, with 0.015<k<0.15, k being expressed in wt %, and 0.15<m≦0.6, m being expressed in mol %. The addition M′ (like Y, Sr, Ca, Zr, . . . ) improves the performance as cathode in rechargeable lithium batteries. In a preferred embodiment a content of 250-400 ppm calcium and 0.2-0.6 mol % of sulfur is used. Particularly, a significantly lower content of soluble base and a dramatically reduced content of fine particles are achieved. Especially preferred performance is achieved if 11.5-13.5% of the metal atoms of the cathodes are divalent nickel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.