A preparation method of a multistage-channel carbon
electrode material mainly comprises the following steps: cleaning a
halogen egg shell, performing ball milling on the shell for 2-12 hours, performing acid-base soak on the shell for 6-48 hours, after being subjected to
calcination in an
inert atmosphere, performing ultrasonic treatment on the shell in HNO3, using HCl to soak the shell, washing the shell to be neutral, and
drying the shell to obtain a multistage-channel carbon material;
grinding the multistage-channel carbon material to
powder; mixing the carbon material,
acetylene black and PTFE
emulsion according to the
mass ratio of 80:15:5 uniformly by adopting
alcohol ultrasonography; performing water bath at 65 DEG on the mixture to enable the mixture to be heated to be muddy; then taking out 0.5-10 mg muddy product to uniformly coat on a piece of foam nickle of 1*1 cm;
drying the foam nickle in the vacuum for 12 hours; and finally performing tabletting on the foam nicke under a pressure of 4 MPa to obtain an
electrode piece, and vacuum soaking the
electrode piece in an
electrolyte solution for 6 hours for reservation. The carbon
electrode material is energy-saving, environment-friendly and good in recycling stability of the carbon
electrode material; and the
discharge specific capacity can reach up to 176 F / g.