▎ 摘　　要

NOVELTY - Method for modifying hard carbon material using ion irradiation technology, involves (i) preparing hard carbon powder by high-temperature carbonization by heating hard carbon precursor at 400-700℃ in an inert gas for 1-5 hours, heating at 1200-1600℃ and heat-preserving for 2-10 hours to make the material carbonize and crack, cooling, and grinding and sieving the material to obtain the hard carbon powder, (ii) preparing hard carbon material pole piece, and (iii) performing ion irradiation modification by transferring the hard carbon material pole piece obtained in step (ii) to an irradiation vacuum target chamber, using an ion implanter to accelerate the ions generated by the ion source to the hard carbon material pole piece at high speed after high-pressure acceleration, and realizing the controllable modification of the microstructure of the hard carbon material pole piece by adjusting the ion implantation energy and irradiation dose. USE - The method is used for modifying hard carbon material using ion irradiation technology in negative electrode material of sodium ion battery (claimed), lithium ion battery, lead-acid battery, nickel cadmium battery, lithium polymer battery, and lithium battery. ADVANTAGE - The method uses the hard carbon precursor raw material which is rich, low cost, environmentally-friendly, and has high first coulomb efficiency and high rate performance. DETAILED DESCRIPTION - Method for modifying hard carbon material using ion irradiation technology, involves (i) preparing hard carbon powder by high-temperature carbonization by heating hard carbon precursor at 400-700℃ in an inert gas for 1-5 hours, heating at 1200-1600℃ and heat-preserving for 2-10 hours to make the material carbonize and crack, cooling, and grinding and sieving the material to obtain the hard carbon powder, (ii) preparing hard carbon material pole piece by uniformly mixing the hard carbon powder obtained in step (i) with conductive agent and binder, adding solvent and stirring to form a uniform slurry, coating on aluminum foil, transferring to vacuum oven, and drying to obtain the hard carbon material pole pieces, and (iii) performing ion irradiation modification by transferring the hard carbon material pole piece obtained in step (ii) to an irradiation vacuum target chamber, using an ion implanter to accelerate the ions generated by the ion source to the hard carbon material pole piece at high speed after high-pressure acceleration, and realizing the controllable modification of the microstructure of the hard carbon material pole piece by adjusting the ion implantation energy and irradiation dose.