The invention discloses a method for preparing fewer-layer
graphene on the basis of
biomass waste, which comprises the following steps: carrying out
hydrothermal treatment on the
biomass waste, and carrying out
carbonization by heating and
calcination, thereby obtaining a
carbonization material; immersing the
carbonization material in an acid solution to remove impurities, thereby obtaining
biomass carbon; and quickly heating the
biomass carbon in an
argon atmosphere, and carrying out high-temperature graphitization to obtain the biomass fewer-layer
graphene. The hydrothermal process is combined with the high-temperature graphitization to directly strip the biomass waste, and the carbonization and high-temperature graphitization are carried out. Thus, the prepared biomass fewer-layer
graphene has the advantages of fewer
layers (2-10
layers), fewer defects, fewer oxy groups, high electric
conductivity and small
carbon layer interval. The method is simple to operate, has the advantages of low cost and high graphene yield, and can easily implement industrialized large-scale production. The prepared biomass fewer-layer graphene can be used in the fields of
lithium ion batteries, supercapacitors and the like, is beneficial to
green production of battery industry, and has important practical value and favorable application prospects.