Preparation method of electro-deposition graphene thin film lithium ion battery negative electrode plate

The invention discloses a preparation method of an electro-deposition graphene thin film lithium ion battery negative electrode plate. The preparation method comprises the following steps of (1) configuring a polyacid solution at pH of 1-2, and enabling graphene oxide to be dissolved into the configured polyacid solution to obtain a dispersion system used as an electro deposition liquid; (2) putting a copper foil into the electro deposition liquid for performing deposition on the surface of the copper foil to obtain a polyacid-graphene composite film; (3) enabling the prepared polyacid-graphene composite film to be soaked in a LiOH solution to enable hydrogen ions and hydroxide ions to be fully reacted to complete exchange of hydrogen ions and hydroxide ions to obtain a polyacid lithium salt-graphene composite film; and (4) performing cleaning and drying on the prepared polyacid lithium salt-graphene composite film. The negative electrode plate prepared in the method is high in compaction and uniformity, shor