Electrode protective layer, and preparation method therefor and use thereof

An electrode protective layer, comprising a metal oxide, and having a 1 to multi-layer laminated structure, and the metal oxide has ionic conductivity;

• wherein the metal oxide comprises at least one of a binary oxide and a ternary oxide;
• wherein the binary oxide has a general formula of AOm;
• in the AOm, A is independently selected from one of the group consisting of V, Mo, Nb, Sb, Ge, Zn, Cd, In, Co, Fe, Mn, Ni, Cu and Cr;
• and 1≤m≤3;
• wherein the ternary oxide is at least one of titanate, niobate, stannate, antimonate and other transition-metal ternary oxides satisfying the general formula of XY2O4;
• wherein the titanate is selected from at least one of the group consisting of Li4Ti5O12 and MgTi2O5;
• wherein the niobate is TiNb2O7;
• wherein the stannate is selected from at least one of the group consisting of Mg2SnO4, MgSnO3, Mn2SnO4, Co2SnO4, CoSnO3, Zn2SnO4, CaSnO3, SrSnO3 and Li2SnO3;
• wherein the antimonate is selected from at least one of the group consisting of CoSb2O6, NiSb2O6 and CuSb2O6.