Preparation and application of organic-inorganic composite modified layered positive electrode material

Abstract

The invention belongs to the technical field of sodium ion batteries, discloses preparation and application of an organic-inorganic composite modified layered positive electrode material, and solves the technical problems of high residual sodium content on the surface of the material, poor stability in air and poor cycle performance. Mixing the nickel-iron-manganese layered material precursor with a sodium source, and calcining to obtain a nickel-iron-manganese layered material; mixing the obtained nickel-iron-manganese layered material with boron-containing inorganic acid, and calcining again to obtain a material A; and dissolving the obtained material A in a solvent, adding fluorine-containing silane, carrying out a reflux reaction in an inert gas atmosphere, and carrying out cleaning and drying to obtain the organic-inorganic composite modified layered positive electrode material. According to the method, synergistic modification of inorganic anchoring-organic packaging is achieved, the borate layer effectively removes residual sodium on the surface and provides an ion conduction channel, the organic layer further eliminates residual alkali and endows the material with excellent hydrophobicity and interface flexibility, and the obtained positive electrode material has good air stability and electrochemical cycle stability.

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