Pre-lithiated film and preparation method therefor and application thereof

A pre-lithiated film, comprising a 1 μm-50 μm base film and a 0.02 μm-100 μm pre-lithiated coating coated on the base film;

• the pre-lithiated coating including:
• 1 wt %-99.99 wt % of a pre-lithiated material, 0 wt %-98.99 wt % of a coating material, 0.01 wt %-10 wt % of a binder, 0%-10 wt % of a conductive additive material, 0 wt %-2 wt % of a dispersing agent and 0 wt %-2 wt % of an aid;
• wherein, the pre-lithiated material is a material that can produce an electrochemical reaction to release lithium ions under voltage control;
• the pre-lithiated material includes LixM1yAz, LixM2y(PO4)z, LixM2y(SiO4)z, Li2S, or LixM1ySz;
• x, y and z are integers or non-integers and satisfy a balance of electrovalence of a chemical formula;
• M1 is one or a combination of more than one of a metallic element, a transition metallic element, a rare earth element, an alkali metallic element and an IVA group element;
• M2 is one or a combination of more than one of a metallic element, a transition metallic element and an IVA group element;
• A is one or a combination of more than one of O, F, Cl, S and N elements;
• wherein, the pre-lithiated material is transformed into a material containing a lithium source or a material not containing a lithium source after charging formation;
• the material containing the lithium source includes:
• LiaM1bAc, LiaM2b(PO4)c, LiaM2b(SiO4)c, Li2S or LiaM1bSc, wherein a, b and c are integers or non-integers and satisfy the balance of electrovalence of a chemical formula;
• and
• the material not containing the lithium source includes one or a combination of several of S, CuO, Cu2O, Fe2O3, Fe3O4, FeO, Al2O3, Co3O4, Co2O3, V2O5, MnO, Mn2O3, NiO, MgO, TiO2, AlPO4, TiPO4, CoPO4, MnPO4, Ni3(PO4)2, Mg3(PO4)2 and Co2(PO4)3.