Preparation method of bionic carbon negative electrode material used as potassium ion battery negative electrode, and product

The invention provides a preparation method of a bionic carbon negative electrode material used as a potassium ion battery negative electrode, and a product. The preparation method of the bionic carbon negative electrode material comprises the following steps: preparing a nitrogen-carbon compound (C3N4) intermediate; then catalyzing with a metal catalyst, and carbonizing at a high temperature of 700-900 DEG C; and finally, carrying out acid treatment to remove the metal catalyst, washing, and drying in a vacuum drying oven at 50-80 DEG C for 12-18 hours to obtain the biomimetic carbon negativeelectrode material similar to a biological cell structure. The negative electrode of the potassium ion battery is the biomimetic carbon negative electrode material prepared by the method, the potassium ion battery uses Prussian blue as a positive electrode, uses 4mol L<-1> of potassium bis(fluorosulfonyl) amide as an electrolyte, and uses 1, 2-dimethoxyethane as a solvent. The biomimetic carbon provided by the invention has excellent electrochemical properties such as high reversible capacity, excellent rate capability, excellent cycle performance and the like as a negative electrode materialof a potassium ion battery.