Negative electrode material and preparation method and application thereof

The invention discloses a negative electrode material and a preparation method and application thereof.The negative electrode material comprises a hard carbon material, the hard carbon material is provided with a plurality of holes and a coating layer, and active metal is packaged in the holes; and the coating layer is coated on the surface of the active metal or seals the holes. The negative electrode material has active metal sodium and the like which are packaged in a hard carbon hole structure and comprise a compact coating layer, sodium ions and the like consumed when SEI is formed can be supplemented, and therefore the first effect of hard carbon is greatly improved. 本申请公开了一种负极材料及其制备方法和应用，其中负极材料包括硬碳材料，所述硬碳材料具有若干孔洞和包覆层，所述孔洞内封装有活性金属；所述包覆层包覆在所述活性金属的表面或者封闭所述孔洞。本申请的负极材料，具有封装在硬碳孔洞结构中的包含有致密包覆层的活性金属钠等，能够补充形成SEI时消耗的钠离子等，从而极大提高硬碳首效。