Nonaqueous electrolyte secondary cell and a tungsten or molybdenum substituted lithium positive electrode active material
US6811925B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 12, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Jan 27, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A positive active material for nonaqueous electrolyte secondary batteries which has a higher capacity and improved thermal stability in a charged state and is less expensive compared to the current active material of LiCoO2 is provided by a lithium compound oxide having the formula:LiaNibCocMndMeO2  (1)where M stands for one or two of W and Mo,0.90≦a≦1.15, 0<b<0.99, 0<c≦0.5, 0<d≦0.5, 0<c+d≦0.9, 0.01≦e≦0.1, and b+c+d+e=1,the lithium compound oxide giving an X-ray diffraction pattern including a diffraction peak or peaks assigned to a compound oxide of Li and W and/or a compound oxide of Li and Mo, in addition to main diffraction peaks assigned to a hexagonal crystal structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.