- METHOD FOR PRODUCING POLYANIONIC POSITIVE ELECTRODE ACTIVE MATERIAL COMPOSITE PARTICLES AND POLYANIONIC POSITIVE ELECTRODE ACTIVE MATERIAL PRECURSOR-GRAPHITE OXIDE COMPOSITE GRANULATED BODIES

摘要

Conventional polyanionic positive electrode active material-graphene composite particles have a small contact area between graphene and polyanionic positive electrode active material, and thus high conductivity could not be obtained. The present invention provides, Step 1: a step of mixing a polyanionic positive electrode active material precursor and graphite oxide to form a precursor composite assembly including polyanionic positive electrode active material precursor particles in the graphite oxide; Step 2: It is a method for producing polyanionic positive electrode active material composite particles having a step of heating the precursor composite assembly obtained in step 1 at 500°C or higher in an inert atmosphere or a reducing atmosphere, and in the X-ray diffraction intensity of the precursor composite assembly, The maximum intensity of the X-ray diffraction peak based on the positive electrode active material is less than 50% of the maximum intensity of the X-ray diffraction peak based on other than the positive electrode active material, and in the X-ray diffraction intensity of the polyanionic positive electrode active material composite particles, based on the positive electrode active material This is a method for producing polyanionic positive electrode active material composite particles in which the maximum intensity of the X-ray diffraction peak is 50% or more with respect to the maximum intensity of the X-ray diffraction peak based in addition to the positive electrode active material.