Lithiated nickel dioxide and secondary cells prepared therefrom
US5264201A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1990 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Jul 23, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Lithiated nickel dioxide cathode-active materials for electrochemical cells aving the formula Li.sub.x Ni.sub.2-x-y M.sub.y O.sub.2, with x being between about 0.8 and about 1.0, M being one or more metals selected from cobalt, iron, chromium, titanium, manganese and vanadium, and y being less than about 0.2, with the proviso that y is less than about 0.5 for cobalt, which material is substantially free of lithium hydroxide and lithium carbonate. The materials are prepared by providing a substantially homogeneous dry intermediate mixture of a starting material containing a nickel compound selected from nickel oxide, nickel hydroxide, and mixtures thereof, and optionally including one or more oxides or hydroxides of a transition metal selected from cobalt, iron, chromium, titanium, manganese and vanadium, together with between about a 10 and about a 25% stoichiometric excess of lithium hydroxide. The mixture is heat treated at a temperature above about 600.degree. C. in an atmosphere substantially free of carbon dioxide and having a partial pressure ratio of oxygen to water vapor greater than about 15, after which any lithium hydroxide or lithium carbonate present in the mixture is …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.