▎ 摘　　要

NOVELTY - Preparation of graphene composite iron carbodiimide material involves taking iron salt into 30-60 ml absolute ethyl alcohol solution and stirring, adding 0.1-0.2 g bis-dodecyl dimethyl ammonium bromide in the stirring process to obtain first solution, where the iron salt is organic acid iron salt or inorganic iron salt, taking carbon-nitrogen-containing organic matter into the first solution and stirring to obtain second solution, where the mass ratio of iron salt in the second solution and the carbon-nitrogen-containing organic matter is (5:1)-(1:9), adding reducing graphene oxide into the second solution, dispersing to obtain third solution, where the mass ratio of the iron salt in the third solution and the reducing graphene oxide is (80:1)-(20:1), reacting the third solution for 12-30 hours at 160-200 degrees C, freezing and drying the collected product, and calcining the product at 300-600 degrees C, and keeping the temperature for 45 minutes to 4 hours. USE - Preparation of graphene composite iron carbodiimide material used as cathode material for potassium ion battery (all claimed). ADVANTAGE - The method enables preparing graphene composite iron-carbodiimide material having excellent potassium storage performance and multiplying power performance, and provides reference basis for improving the system and performance of the cathode material of the potassium ion battery. The method is capable of enhancing structure stability, relieving volume expansion in iron carbodiimide charging and discharging process, so as to improve electrochemical performance, and researching influence of the material structure on electrochemical potassium storage process, and establishing the structure effect mechanism of the material in the potassium storage process.