▎ 摘　　要

NOVELTY - Preparing zinc-graphene lithium ion battery cathode material comprises placing three bottle in ice water bath, adding concentrated sulfuric acid, graphite, sodium nitrate, potassium permanganate and distilled water, heating, adding hydrogen peroxide and distilled water, diluting, washing, centrifuging, air-drying, mixing zinc acetate dihydrate with aqueous solution, adding aqueous ammonia solution, heating, washing, centrifuging, drying, ultrasonically treating graphene oxide, dissolving in aqueous solution, dissolving zinc acetate dihydrate, heating, centrifuging, washing and drying. USE - The method is useful for improving the conductive cycling ability of the electrode material of the zinc oxide-graphene lithium ion battery due to capacity fading and volume effect of the electrode material by graphene (claimed). ADVANTAGE - The cathode material comprises zinc oxide-graphene complex that has much higher cycling ability than the uncomlexed zinc oxide. DETAILED DESCRIPTION - Preparing zinc-graphene lithium ion battery cathode material comprises (i) preparing graphite oxide comprising (a) placing three 250 ml bottle in ice water bath, sequentially adding 80 ml concentrated sulfuric acid, 2 g graphite and 1 g sodium nitrate, stirring for 1 hour, incubating at lower than 10 degrees C, slowly adding 3 g potassium permanganate into the bottle, stirring for 1 hour, removing water bath, incubating at lower than 20 degrees C, slowly adding 6 g potassium permanganate to the bottle, heating at 35 degrees C and stirring for 60 minutes, (b) slowly adding 90 ml distilled water in the bottle, heating at 80 degrees C, stirring for 30 minutes, adding 7ml hydrogen peroxide (30%) to the solution, 55 ml distilled water and allowing to stand for 12 hours, (c) diluting with 3% hydrochloric acid, washing with distilled water, centrifuging (3 times), drying at 40 degrees C in oven for 30 minutes, placing in the culture dish and air-drying, to obtain product, (ii) preparing zinc oxide by hydrothermal treatment comprising (a) mixing 0.2 g zinc acetate dihydrate with 20 ml aqueous solution, slowly adding 25% aqueous ammonia solution in a dropwise manner, magnetically stirring until pH is 9-10 and stirring for 30 minutes, (b) placing the mixture in polytetrafluoroethylene lined reaction kettle, placing the reaction kettle in the baking box, heating at 180 degrees C and incubating for 12 hours, (c) naturally cooling, washing with water, centrifuging and drying at less than 80 degrees C, to obtain the product, (iii) preparing zinc oxide-reduced graphene oxide by hydrothermal synthesis comprising (a) taking 0.1-1.76 g graphene oxide prepared by Hummers method, ultrasonically treating and dissolving in 18 ml aqueous solution, to obtain graphene oxide aqueous solution, (b) dissolving 0.2 g zinc acetate dehydrate in graphene oxide aqueous solution, stirring, adjusting pH to 9-10 by adding 25% aqueous ammonia, stirring for 30 minutes, subjecting 20 ml mixture into polytetrafluoroethylene lined reaction kettle, heating at 180 degrees C for 12 hours, (c) naturally cooling, removing the product of polytetrafluoroethylene, repeatedly centrifuging and washing, to obtain the precipitate and vacuum drying the precipitate at 80 degrees C for one day.