The invention belongs to the field of
lithium ion batteries, and discloses a preparation method of
lithium slurry and a product and application thereof, the preparation method of the
slurry comprises the following steps: using a mixed
organic solvent formed by mixing an
etching agent and a passivating agent, dispersing a material containing
lithium metal in the mixed
organic solvent, and preparing the lithium
slurry. According to the method, an
etching agent is used for
etching grain boundaries in a material containing
lithium metal, a passivating agent is used for passivating grain surfaces, so that slurry containing stable micron-scale and / or nano-scale lithium-containing particles is obtained, and the etching agent and the passivating agent are selected from specific organic solvents. According to the invention, the
organic solvent is adopted to carry out etching and
passivation reaction on the material containing the
lithium metal to obtain the slurry containing the lithium particles, and the particle size is uniform and controllable. The slurry containing the lithium particles can be used for
electrode pre-lithiation and preparation of a
lithium metal-based
electrode and a lithium-based
solid-state
electrode, so that the
energy density of a lithium secondary battery is improved, and the cycle life of the lithium secondary battery is prolonged.