Titanium oxide sol and process for producing same, ultrafine particulate titanium oxide, process for producing same, and uses of same

Abstract

A liquid phase method for producing titanium oxide sol by hydrolysis of titanium tetrachloride, which includes mixing an aqueous titanium tetrachloride solution into water at a temperature of 80° C. or higher within 60 seconds while maintaining the mixed solution at the temperature and cooling it to less than 60° C. within 15 minutes after the mixing is completed. Also disclosed is a titanium oxide sol obtained by the method, having an average primal particle diameter (D) of 3 to 8 nm, a cumulative 50% volume particle diameter (D50) and Dhave the relationship represented by D50=k×Dwhere k is 1 or more and less than 5, and an anatase content of 70% or more; a particulate titanium oxide obtained by drying the titanium oxide sol; and a production method and application thereof to solar cells, lithium ion battery electrodes and dielectric materials.