Regulated Synthesis of Sodium-Ion Cathode Materials: Two High-Performance Spherical Layered Metal Oxides

NaNi1/3Fe1/3Mn1/3O2 (NFM111) is widely used because of its high theoretical specific capacity and excellent environmental adaptability. In our previous study, NFM111 was synthesized by solid-phase ball milling and comprehensively evaluated. It was found that NFM111 has NiO in the bulk phase, which may lead to the instability of the structure and affect the properties of the material. To solve this problem, we prepared spherical NFM111 by coprecipitation and prilling in this work. The spherical morphology of NFM111 is obtained, and the content of NiO peaks is reduced. At the same time, the tap density of the particles and the rate performance of the material are effectively improved. In this work, the advantages and disadvantages of two methods for preparing spherical NFM111 materials are analyzed by comparing their properties. It provides some reference for the subsequent production research of spherical NFM111.