Nitrogen-doped cobalt-based electrode material and preparation method and application thereof

The invention provides a nitrogen-doped cobalt-based electrode material and a preparation method and application thereof, and belongs to the technical field of electrode materials. The cobalt source, the nitrogen-containing carbon source, the alkali metal chloride and the water are mixed and then subjected to vacuum freeze drying, the vacuum freeze drying has the characteristics of ice body supporting and moisture sublimation, the precursor structure can be prevented from being damaged in the drying process, then calcination is conducted, the shrinkage rate and collapse rate of the precursor structure in the calcination process can be reduced, and the performance of the catalyst is improved. The nitrogen-containing carbon source forms a nitrogen-doped carbon material after being calcined, the conductivity of the electrode material is improved, meanwhile, the electron transfer rate can be improved through nitrogen doping, and the electrochemical performance of the electrode material is further improved. The re