▎ 摘　　要

NOVELTY - Method for preparing zinc titanate/reduced graphene oxide nanocomposite, which involves (i) dissolving zinc source, titanium source and precipitating agent in ethylene glycol, transferring zinc titanate precursor solution to PTFE-lined reactor, reacting at 120-220 degrees C for 8-24 hours, cooling to room temperature, centrifuging precipitate, washing solid with deionized water and absolute ethanol, and drying under vacuum at 60-80 degrees C for 2-5 hours to obtain microfloral zinc titanate, (ii) dispersing microfloral zinc titanate in deionized water and performing ultrasonic dispersion to obtain suspension (A), and preparing 0.5 g/L graphene oxide aqueous solution by ultrasonic dispersion to obtain solution (B), (iii) mixing suspension (A) and solution (B) to obtain suspension (C), and (iv) freeze-drying suspension (C) to obtain fluffy zinc titanate/graphene oxide nanocomposite, and calcining in 5% hydrogen/argon mixed atmosphere at 200-400 degrees C at heating rate of 2 degrees C/minute for 0.5-2 hours. USE - The method is useful for preparing zinc titanate/reduced graphene oxide nanocomposite which is used as negative electrode active material for lithium ion capacitor (all claimed). ADVANTAGE - The method is simple to operate, environmentally-friendly and economical. The nanocomposite has excellent electrical conductivity which improves electron transfer efficiency, and when applied to lithium-ion capacitors, the output voltage is 4.5 V, which improves the energy density of lithium-ion capacitor and has the characteristics of high-energy density of lithium-ion batteries and high-power density of double-layer capacitors. DETAILED DESCRIPTION - Method for preparing zinc titanate/reduced graphene oxide nanocomposite, which involves (i) dissolving zinc source, titanium source and precipitant in ethylene glycol, transferring the zinc titanate precursor solution to a PTFE-lined reactor, reacting at 120-220 degrees C for 8-24 hours, cooling to room temperature, centrifuging the precipitate, washing the solid for several times with deionized water and absolute ethanol, and drying under vacuum at 60-80 degrees C for 2-5 hours to obtain microfloral zinc titanate, (ii) dispersing the microfloral zinc titanate in deionized water and performing homogeneous ultrasonic dispersion to obtain suspension (A) with a concentration of 1 g/l, and preparing 0.5 g/L graphene oxide aqueous solution by ultrasonic dispersion to obtain solution (B), (iii) mixing suspension (A) and solution (B) in a volume ratio of 1:4-2:1 to obtain suspension (C), and (iv) freeze-drying the suspension (C) to obtain a fluffy zinc titanate/graphene oxide nanocomposite, and calcining in a 5% hydrogen/argon mixed atmosphere at 200-400 degrees C at a heating rate of 2 degrees C/minute for 0.5-2 hours.