MANUFACTURING METHOD OF POSITIVE ACTIVE MATERIAL PRECURSOR FOR SODIUM RECHARGEABLE BATTERIES, POSITIVE ACTIVE MATERIAL PRECURSOR FOR SODIUM RECHARGEABLE BATTERIES MADE BY THE SAME, AND MANUFACTURING METHOD OF POSITIVE ACTIVE MATERIAL FOR SODIUM RECHARGEABLE BATTERIES, POSITIVE ACTIVE MATERIAL FOR SODIUM RECHARGEABLE BATTERIES MADE BY THE SAME

摘要

Disclosed is a method for producing a cathode active material precursor for a sodium secondary battery by using a coprecipitation technique and a cathode active material precursor for a sodium secondary battery produced thereby, and a cathode active material for a sodium secondary battery using the cathode active material precursor for a sodium secondary battery and a method for producing the same.

主权项

1. A method for producing a cathode active material precursor for a sodium secondary battery by using a coprecipitation technique, the method comprising:
(a) introducing distilled water and a first pH adjusting agent into a coprecipitation reactor, supplying air or a nitrogen gas to the reactor, and maintaining a pH in the reactor at from 6.5 to 7.5 while stirring; (b) adjusting the pH in the reactor at from 6.5 to 11 by continuously introducing a second pH adjusting agent into the reactor and mixing the mixture; and (c) forming particles of a cathode active material precursor for a sodium secondary battery by introducing an aqueous solution of transition metal compounds containing a nickel salt, an iron salt, and a manganese salt in an equivalent ratio and a complexing agent into the reactor.