Preparation method of low-volume-shrinkage carbon nanofiber aerogel

The invention relates to a preparation method of low-volume-shrinkage carbon nanofiber aerogel. The preparation method comprises the following steps of: preparing polymer nanofibers through electrostatic spinning; carrying out stabilization and carbonization treatment to obtain carbon nanofibers; preparing a carbon nanofiber aqueous dispersion through homogenate dispersion, and then carrying out freeze forming and freeze drying on the carbon nanofiber aqueous dispersion to obtain aerogel; and then carrying out thermal crosslinking and pyrolysis treatment or only carrying out pyrolysis treatment. According to the preparation method disclosed by the invention, by means of a mode of sequentially carrying out carbonization, pyrolysis and auxiliary agent-assisted regulation and control, the obtained aerogel material has good mechanical property and low volume shrinkage; and the problems of high brittleness and high volume shrinkage of carbon nanofiber aerogel prepared by traditional electrostatic spinning are impr