The invention discovers and proposes a characteristic that interior species of phenolic resin are nonuniform in distribution in a
polymerization process, and discloses a method for preparing a hollow carbon sphere by utilizing the characteristic of phenolic resin. The method comprises: (1) putting
phenol into water or a
solvent, adjusting the pH, then adding
aldehyde and stirring at a certain temperature for a period of time; (2) adding a corrosive agent in a
reaction system, stirring at a certain temperature, and selectively removing a part with a relatively low
polymerization degree inside a
polymer by utilizing a
solubility difference of interior species for different solvents, to obtain an
intermediate product, that is, a hollow sphere of phenolic resin
polymer; and (3) calcining the
intermediate product that is obtained in step (2) in an
inertia or
reducing atmosphere, naturally cooling to
room temperature, and thus completing preparation of the hollow carbon sphere. The method is simple and practicable, and the prepared hollow carbon sphere is uniform in shape and controllable in dimension. Moreover, by utilizing a characteristic that the phenolic resin can be in-situ polymerized on surfaces of different nanometer particles, on one hand, a multi-layer hollow structure can be prepared in a multi-cladding and layer-by-layer
corrosion manner, and on the other hand, the different nanometer particles can also be packaged in a cavity in an in-situ mode, so as to prepare a nuclear shell or egg
yolk-
nuclear structure. The prepared hollow carbon sphere has a potential application value in aspects of
silicon-carbon negative
electrode material, Li-S battery,
supercapacitor, heavy
metal ion adsorption, and the like.