▎ 摘　　要

NOVELTY - Preparation of hard carbon cathode involves grinding porous carbon precursor to obtain porous carbon powder with predetermined particle size and rich nano-pores inside, adding the porous carbon powder to a tube furnace, introducing protective gas, heating to a target temperature at a predetermined heating rate, introducing carbon-containing gas source, carrying out chemical vapor deposition at the target temperature, performing constant temperature reaction for a predetermined period of time, closing the carbon-containing gas source, and cooling to room temperature at a predetermined cooling rate. The hard carbon cathode comprises porous carbon and chemical vapor deposition carbon for adjusting the surface pore size, and retains coherent pore structure inside the porous carbon particles. USE - Preparation of hard carbon cathode used for high-energy density sodium ion battery. ADVANTAGE - The method enables to prepare hard carbon cathode for high energy density sodium ion battery with excellent sodium storage performance, which uses chemical vapor deposition carbon coating porous of carbon particles, the adjusting surface the size of the orifice and can keep the continuity of the inner hole, it is helpful for the quick diffusion and storage of the sodium ion in the pore canal. The selected precursor has proper grain diameter, which is good for accelerating the solid phase diffusion rate of the ion, the internal pore volume of the material can provide enough sodium storage space, at the same time, realizing fast ion transmission.