▎ 摘　　要

NOVELTY - Preparing fibrous nickel-bismuth battery involves preparing reduced graphene oxide-bismuth-carbon nanotube fiber anode. A spinnable carbon nanotube array is synthesized by chemical vapor deposition. The catalyst used is iron (Fe)/aluminum oxide (Al2O3), the carbon source is ethylene, and the gas phase carrier is argon and hydrogen. The oriented carbon nanotube film is pulled out from the carbon nanotube array, and laid on a glass substrate, and spun into oriented carbon nanotube fibers. The graphene oxide is prepared by the Hummer method. An aqueous graphene oxide solution having a volume concentration of 0.01-0.09 mg/mL, disodium ethylenediamine tetraacetate to a concentration of 0.1-0.5 mol/L are added, stirred on a magnetic stirrer to form a solution, 10-100mmol/L bismuth nitrate pentahydrate is added, adjusted pH to 4.5-5.5 with NaOH solution to obtain electroplating solution. USE - Preparing fibrous nickel-bismuth battery. ADVANTAGE - The method enables to prepare fibrous nickel-bismuth battery, which has high energy density, high power density and high safety, energy density is 43.35 Wh/kg or 26.01 mWh/cm3, and its power density is 6600 W/kg or 3.96 W/cm3, and 96% of capacity is maintained after 10000 cycles. DETAILED DESCRIPTION - Preparing fibrous nickel-bismuth battery involves preparing reduced graphene oxide-bismuth-carbon nanotube fiber anode. A spinnable carbon nanotube array is synthesized by chemical vapor deposition. The catalyst used is iron (Fe)/aluminum oxide (Al2O3), the carbon source is ethylene, and the gas phase carrier is argon and hydrogen. The oriented carbon nanotube film is pulled out from the carbon nanotube array, and laid on a glass substrate, and spun into oriented carbon nanotube fibers. The graphene oxide is prepared by the Hummer method. An aqueous graphene oxide solution having a volume concentration of 0.01-0.09 mg/mL, disodium ethylenediamine tetraacetate to a concentration of 0.1-0.5 mol/L are added, stirred on a magnetic stirrer to form a solution, 10-100mmol/L bismuth nitrate pentahydrate is added, adjusted pH to 4.5-5.5 with NaOH solution to obtain electroplating solution. The oriented carbon nanotube fibers are used as working electrodes, graphite rods are used as counter electrodes, and mercury-mercury oxide electrodes are used as reference electrodes. The plating voltage is -0.9 Volt to -1.6 Volt, and the plating time is 1-10 minutes to obtain reduced graphene oxide-bismuth-carbon nanotube fibers, soaked in deionized water to remove the surface electrolyte and dried on a hot table. The preparation of reduced graphene oxide-nickel-nickel oxide carbon nanotube fiber cathodes is prepared by wet chemical sol-gel method. The graphene oxide aqueous solution is added with a volume concentration of 0.5-1.5 mg/mL in a beaker, nickel oxide to a concentration of 1-5 mg/mL are added, and sonicated at 40-60 degrees C for 10-30 minutes to obtain graphene oxide to obtain nickel oxide mixed solution. The hydrazine hydrate is adedd with a concentration of 95%, the volume ratio of hydrazine hydrate to the mixed solution is 1:100-1:400, and stirred at 40-60 degrees C for 8-12 hours. The mixed solution is centrifuged, the resulting precipitate is washed with deionized water and ethanol multiple times, and a reduced graphene oxide-nickel oxide composite is obtained in a vacuum drying box at 40-60 degrees C overnight. The obtained composite is annealed in an argon atmosphere in a tube furnace at 400-600 degrees C for 1-5 hours to obtain a reduced graphene oxide-nickel-nickel oxide composite. The 5-15mg complex is dissolved in 1-5mL of ethanol, and sonicated at 40-60 degrees C for 10-30 minutes. The solution obtained is uniformly added dropwise onto the aligned carbon nanotube film, and rolled up to obtain reduced graphene oxide-nickel-nickel oxide carbon nanotube fibers. The reduced graphene oxide-bismuth-carbon nanotube fiber is used as a negative electrode, the reduced graphene oxide-nickel-nickel oxide carbon nanotube fiber is used as a positive electrode, and a fibrous nickel-bismuth battery is obtained by using an aqueous potassium hydroxide solution as an electrolyte. An INDEPENDENT CLAIM is included for a fibrous nickel-bismuth battery, which comprises reduced graphene oxide-bismuth-carbon nanotube fiber having a three-dimensional structure is used as a negative electrode, and a reduced graphene oxide-nickel-nickel oxide carbon nanotube fiber having a layered conductive structure is used as a positive electrode, and aqueous potassium hydroxide solution is used as an electrolyte.