▎ 摘　　要

NOVELTY - Preparing hollow tubular structure iron oxyhydroxide-reduced graphene oxide lithium ion battery cathode material comprises (i) ultrasonically treating nickel foam with acetone, hydrochloric acid, absolute ethanol and deionized water, and drying in a vacuum oven to obtain dried nickel foam, (ii) dissolving graphene oxide in deionized water, and performing ultrasonic treatment after stirring to obtain aqueous graphene oxide solution, (iii) immersing the dried nickel foam obtained in step one in aqueous graphene oxide solution obtained in step two, taking out and drying, and repeating the process of immersion and drying for three times to obtain dried foam nickel-graphene oxide, (iv) placing the dried foamed nickel-graphene oxide obtained in step (iii) in a tube furnace and calcining under inert atmosphere to obtain product A, and (v) immersing the product A obtained in step (iv) in iron salt solution, washing with water, filtering, and drying to obtain final product. USE - The method is useful preparing hollow tubular structure iron oxyhydroxide-reduced graphene oxide lithium ion battery cathode material. ADVANTAGE - The cathode material has increased reaction rate, and excellent cycle stability; shortens the lithium ion transmission path; improves the multiplying power performance; increases diffusion of electrolyte to the electrode material; and utilizes hollow structure, which provides enough space for the volume expansion. DETAILED DESCRIPTION - Preparing hollow tubular structure iron oxyhydroxide-reduced graphene oxide lithium ion battery cathode material comprises (i) ultrasonically treating nickel foam with acetone, hydrochloric acid, absolute ethanol and deionized water, and drying in a vacuum oven to obtain dried nickel foam, (ii) dissolving graphene oxide in deionized water, and performing ultrasonic treatment after stirring to obtain aqueous graphene oxide solution, (iii) immersing the dried nickel foam obtained in step one in aqueous graphene oxide solution obtained in step two, taking out and drying, and repeating the process of immersion and drying for three times to obtain dried foam nickel-graphene oxide, (iv) placing the dried foamed nickel-graphene oxide obtained in step (iii) in a tube furnace and calcining under inert atmosphere to obtain product A, and (v) immersing the product A obtained in step (iv) in iron salt solution, washing with water, filtering, and drying to obtain final product, where the concentration of the aqueous graphene oxide solution in step (ii) is 2-10 mg/ml, the mass-volume ratio between foamed nickel and aqueous graphene oxide solution in step (iii) is 200-800:20-80 (mg:ml), the calcination temperature in step (iv) is 400-900 degrees C, and the time is 2-5 hours, the heating rate is 10 degrees C/minute, the iron salt in step (v) is ferric chloride or ferric nitrate; and the mass-volume ratio between product A and iron salt solution is 10-100:40 (mg:ml).