The invention discloses a preparation method of a
sodium alginate-based dual-network carbon
aerogel negative
electrode material for a
lithium ion battery, and belongs to the technical field of
lithium ion battery negative
electrode materials. The method comprises the following steps: firstly, preparing a certain amount of
sodium alginate
powder and
agar powder into precursor hydrogel by adopting a
sol-
gel method; preparing a Mn (NO3) 2 solution and ZnCl2 particles into a
mixed solution according to a certain proportion, and immersing the precursor hydrogel into the
mixed solution for 6-9 hours to obtain dual-network hydrogel; washing the prepared hydrogel with deionized water for multiple times, and freeze-
drying to obtain fluffy double-network
aerogel; and finally, carrying out high-temperature
carbonization under the protection of
inert gas to obtain the
sodium alginate-based dual-network carbon
aerogel negative
electrode material. The operation method is simple and easy to implement, the used raw materials are low in cost and wide in source, the
prepared material is good in mechanical performance,
conductivity and stability in the charging and discharging process when used for the negative electrode of the
lithium ion battery, meanwhile, the pore structure can be kept, and excellent electrochemical performance is achieved.