Hard carbon negative electrode for sodium ion battery and preparation method of hard carbon negative electrode

The invention discloses a hard carbon negative electrode for a sodium-ion battery and a preparation method of the hard carbon negative electrode, and relates to the technical field of sodium-ion batteries. The hard carbon negative electrode material is prepared from the following raw materials: a carbon source, a porous template material and a heteroatom doped raw material, when an assembled battery discharges, the slope capacity is greater than 90mAh/g, the platform capacity is greater than 170mAh/g, and the first-circle coulombic efficiency ICE is greater than 75%; the electrochemical capability is excellent, and the practical value is high. The preparation method comprises two steps of hard carbon preparation and negative electrode preparation, the sodium-ion battery hard carbon negative electrode prepared by the method has excellent electrochemical performance, can improve the capability of the assembled battery in multiple aspects of cycle performance, rate capability, coulombic efficiency and the like,