Preparation method and application of boron-doped flaky defective niobium-titanium-oxygen material growing on carbon tube

Abstract

The invention relates to a preparation method and application of a boron-doped flaky defective niobium-titanium-oxygen material growing on a carbon tube, and belongs to the technical field of lithium-selenium battery positive electrode materials, the method comprises the following steps: dissolving a niobium source, a titanium source and a carbon nanotube in an organic solvent, adding a surfactant, then adding an alkali source, and carrying out liquid-phase mixing and stirring to obtain the boron-doped flaky defective niobium-titanium-oxygen material growing on the carbon tube. Transferring into a reaction kettle, and reacting at a certain temperature and pressure to generate a composite precursor; and putting the precursor and a boron source into a tubular furnace, and calcining at high temperature to obtain the boron-doped flaky defect niobium titanium oxygen composite material growing on the carbon tube. Then the niobium-titanium-oxygen composite material reacts with selenium to generate a selenium and boron-doped sheet-shaped defect niobium-titanium-oxygen composite material growing on a carbon tube, the selenium and boron-doped sheet-shaped defect niobium-titanium-oxygen composite material serves as a positive electrode active material of the lithium-selenium battery, the sheet-shaped structure, boron doping and oxygen deficiency can remarkably enhance the reaction activity of a substrate plane, formation and dissolution of Li2S are promoted, and the cycle performance and rate capability of the lithium-selenium battery are enhanced.