▎ 摘　　要

NOVELTY - Preparing tin-based lithium ion battery cathode material involves adding selenium powder and tin powder to the high-temperature reaction kettle, where the molar ratio of selenium powder to tin powder is 1:0.45-0.6, and then adding solvent I, ultrasonic and stirring to make it fully dispersed. The copper powder and graphene are added to the beaker, then added solvent II, and stirred ultrasonically at room temperature to make it fully dispersed. The added copper powder and graphene are proportional to the tin powder. The solution is added to the solution, and then perform ultrasonic stirring again for 15 minutes, put the autoclave into an oven, and reacted at 185-240 degrees C for 26 hours, and was taken out and left to air to room temperature and filtered, washed with deionized water and absolute ethanol solution, and finally dried at 85 degrees C for 10 hours to obtain the desired negative electrode material. USE - Preparing tin-based lithium ion battery cathode material. ADVANTAGE - The method enables preparing the tin-based lithium ion battery cathode material with better effect of discharging specific capacity.