▎ 摘　　要

NOVELTY - Production of cobalt-ferrite-graphene lithium ion battery includes pretreating steel rolling oil sludge with petroleum ether, adding dilute sulfuric acid solution, water bath stirring, and centrifuging; concentrating, evaporating, standing, crystallizing, dissolving crystals in water, and oxidizing with hydrogen peroxide; adding cobalt nitrate hexahydrate and graphite, adjusting to alkaline using sodium hydroxide, heating, stirring to co-precipitate, washing, and vacuum-drying; and calcining, slicing, and encapsulating. USE - Method for production of cobalt-ferrite-graphene lithium ion battery (claimed). ADVANTAGE - The method fully utilizes waste steel rolling oil sludge. The battery has good performance. DETAILED DESCRIPTION - Production of cobalt-ferrite-graphene lithium ion battery comprises pretreating steel rolling oil sludge with petroleum ether, adding dilute sulfuric acid solution, water bath stirring, and centrifuging to separate unreacted non-ferrous solid residues and obtain ferrous sulfate solution; concentrating, evaporating, standing at - 10-5 degrees C, crystallizing, dissolving ferrous sulfate crystals in water, and oxidizing with hydrogen peroxide; adding cobalt nitrate hexahydrate and graphite, adjusting to alkaline using sodium hydroxide, heating, stirring to co-precipitate, washing, and vacuum-drying; and calcining to 300-600 degrees C under inert atmosphere to remove oxygen-containing groups, slicing, and encapsulating.