Modified Li5FeO4 positive electrode lithium supplement additive, preparation method thereof and lithium ion battery

The invention relates to the technical field of lithium ion batteries, and discloses a modified Li5FeO4 positive electrode lithium supplement additive, a preparation method thereof and a lithium ion battery. The positive electrode lithium supplement additive comprises a Li5FeO4 core, a porous carbon layer and an Mxene layer, the Li5FeO4 core is coated with the porous carbon layer, the porous carbon layer is coated with the Mxene layer, and the porosity of the modified Li5FeO4 positive electrode lithium supplement additive is 5-25%; the lithium ion battery adopting the anode lithium supplement additive has excellent capacity retention ratio and low resistivity. 本发明涉及锂离子电池技术领域，公开了一种改性Li5FeO4正极补锂添加剂及其制备方法和锂离子电池。所述正极补锂添加剂包括Li5FeO4核，包覆在所述Li5FeO4核外的多孔碳层，以及包覆在所述多孔碳层上的Mxene层，所述改性Li5FeO4正极补锂添加剂的孔隙率为5-25％；采用该正极补锂添加剂的锂离子电池具有优良的容量保持率和低电阻率。