The preparation method specifically comprises the following steps: uniformly mixing a core-shell structure magnetic nano template which takes
polyaniline as a shell and Fe3O4 as a core with a negative
electrode material, a binder, a conductive agent and a
solvent water to prepare negative
electrode slurry,
coating the surface of a
current collector with the negative
electrode slurry, and
drying to obtain the
lithium battery negative electrode plate. The preparation method comprises the following steps: preparing a thick electrode from magnetic nano Fe3O4, directionally assembling the magnetic nano Fe3O4 on the surface of a
current collector by loading a
magnetic field, recycling the magnetic nano Fe3O4 in the thick electrode through
microwave heating and a magnetic recycling device, and constructing a three-dimensional network channel with
high conductivity in the thick electrode to effectively improve the
conductivity of the electrode, shorten
ion and
electron migration paths and improve the
conductivity of the electrode. A multi-dimensional open
permeation channel is provided, the wettability of an
electrolyte is enhanced, the electrode
tortuosity is reduced, the gradient
porosity is generated, a molecular-level channel beneficial to
lithium ion transportation is formed, and high-speed conduction of
lithium ions is promoted.