Method for making lithium iron phosphate cathode material

摘要

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.

主权项

1. A method for making lithium iron phosphate, comprising:
reacting an alkali with a ferric salt in water to form a red colored ferric hydroxide precipitate in the water; mixing the red colored ferric hydroxide precipitate with deionized water, organic solvent, and emulsifier to form a water-in-oil emulsion; adding phosphoric acid solution and iron metal powder to the water-in-oil emulsion to form ferrous hydrogen phosphate; introducing a lithium source to the water-in-oil emulsion and reacting the lithium source with the ferrous hydrogen phosphate to form a precursor in the water-in-oil emulsion; and heating the precursor in a protective gas at a heating temperature in a range from about 600° C. to about 800° C. to form lithium iron phosphate.