Method for making lithium iron phosphate cathode material
US9133029B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 6, 2013 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Jan 7, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01D15/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for making lithium iron phosphate is provided. In the method, an alkali is reacted with a ferric salt in water to form a red colored ferric hydroxide precipitate in the water. The red colored ferric hydroxide precipitate is mixed with deionized water, organic solvent, and emulsifier to form an water-in-oil emulsion. The phosphoric acid solution and iron metal powder are added to the water-in-oil emulsion to form ferrous hydrogen phosphate. A lithium source is introduced to the water-in-oil emulsion and reacted with the ferrous hydrogen phosphate to form a precursor in the water-in-oil emulsion. The precursor is heated in a protective gas at a heating temperature in a range from about 600° C. to about 800° C. to form lithium iron phosphate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.