The invention relates to the technical field of
lithium ion batteries, in particular to an
electrode and a preparation method thereof. The
electrode comprises a
current collector, a plurality of through hole
layers and a plurality of active
layers, the through hole
layers and the active layers are arranged on the
current collector, and the through hole layers are arranged between the
current collector and the active layers or between any adjacent active layers. The
electrode is composed of a plurality of active layers and through hole layers, each through hole layer is composed of a net structure of a
high polymer, the
high polymer is dissolved in
electrolyte when the electrode is used, namely a pore structure with controllable pore size and distribution is formed, so that each
active layer can be in contact with more
electrolyte, and the problems that
electrolyte infiltration of a thick electrode is difficult and
ion transmission is slow are solved. Besides, the morphology of the through hole layer is controllable, compared with a traditional
porous electrode, the
tortuosity of pores is lower,
ion conduction is faster, the ion
conductivity of the
pole piece is improved, and then the energy, the
power density and the rate capability of a
battery cell are guaranteed.