Nitrogen-doped hollow cobaltosic oxide and preparation method therefor and use thereof

Provided are nitrogen-doped hollow cobaltosic oxide, and a preparation method therefor and the use thereof. The nitrogen-doped hollow cobaltosic oxide has a chemical formula of Co3O4-COF-T-D@C-N, wherein COF-T-D is a covalent organic framework. The preparation method therefor comprises the following steps: (1) mixing an adamantane containing an amino group, a naphthalene containing an aldehyde group and a hydroxyl group, and a cosolvent, adding an acidizing fluid for acidification, and performing a heating reaction to obtain a first solid COF-T-D; (2) adding the first solid COF-T-D to an organic solvent and mixing and stirring same with a cobalt salt, performing a reaction, the subjecting same to solid-liquid separation, and taking a solid phase to obtain a second solid Co-COF-T-D; and (3) cleaning the second solid Co-COF-T-D, adding nitrogen, subjecting same to a heat treatment, cooling same, and adding oxygen for oxygenation to obtain the nitrogen-doped hollow cobaltosic oxide Co3O4-COF-T-D@C-N. Further included is the use of the nitrogen-doped hollow cobaltosic oxide in the preparation of a lithium-ion battery, a capacitor, a magnetic material, a catalyst, a gas sensor, a colorant, or a pressure-sensitive ceramic material. The nitrogen-doped hollow cobaltosic oxide has a large specific surface area due to the presence of an open hollow structure, such that the contact area with an electrolyte is large, the transportation process of lithium ions therein is easier, and a volume effect is avoided during the charging and discharging process by means of the open hollow structure; and nitrogen is introduced for doping, such that particles can be gradually activated to increase the specific surface area and active sites, and the discharging (cycling) stability and rate performance of the material are improved.