Nanometer network structure charcoal material for potassium ion battery and preparation method and application thereof

The invention belongs to the technical field of materials, and discloses a nanometer network structure charcoal material for a potassium ion battery and a preparation method and application thereof. The method comprises the steps that an organic metal ion adsorption material containing a metal ion adsorption group structure is subjected to the carbonization and acid etching process after metal ions are adsorbed, and the nanometer network structure charcoal material with the high specific surface area is obtained. The technology is simple, the obtained charcoal material has the nanometer network structure and is connected in the three-dimensional direction, the abundant duct structure with the layering performance is shown, and the BET specific area is 500-1,100 m g. When the material is adopted as a potassium ion battery negative electrode material, the capacity can reach 150-300 mAh g when the current density is 100 mA g, in addition, the good multiplying power performance and the good circular s