The invention discloses a
silicon-based negative
electrode of a
lithium ion battery and a method for preparing the
silicon-based negative
electrode of the
lithium ion battery. The
silicon-based negative
electrode is prepared by
coating a
copper foil with negative electrode
slurry. The negative electrode
slurry is prepared from, by weight, 15.0-18.0 parts of
graphite, 1.0-2.0 parts of
nano silicon powder, 0.3-2.5 parts of conductive agent, 1.0-8.0 parts of binding agent, 1.0-1.5 parts of
thickening agent and 70.0-80.0 parts of dispersing medium. By adoption of a
polystyrene-polybutyl
acrylate-
polystyrene block
polymer binding agent which is extremely high in silicon
binding force and capable of providing high elasticity,
volume variation of silicon in charging and discharging can be counteracted, and performances of a
graphene-based negative electrode of the
lithium ion battery are improved. The prepared high-energy-density negative electrode is 514mAh / g in
energy density during 0.1C charging and discharging, and the power negative electrode is 349mAh / g in
energy density in 2C charging and discharging. The silicon-based negative electrode of the
lithium ion battery and the method for preparing the silicon-based negative electrode of the
lithium ion battery have the advantages of easiness in
raw material acquisition, technical simplicity and environment friendliness.