A kind of preparation method of carbon nanotube/graphene composite material

Abstract

The invention discloses a method for preparing a carbon nanotube / graphene composite material, which comprises adding graphene oxide slurry and a surfactant into a single-layer glass reactor and stirring evenly, and then adding the carbon nanotube slurry to obtain a mixed slurry The mixed slurry is dried and crushed; the crushed particles are added to a muffle furnace, expanded in the air, and cooled to normal temperature after reduction treatment to obtain a powdered carbon nanotube / graphene composite material; the powdered composite material and The slurry-like carbon nanotube / graphene composite material was prepared by solvent mixing and ultrasonic vibration. The preparation method provided by the invention has the advantages of simple process, convenient preparation and low energy consumption, and is suitable for large-scale industrial production; the carbon nanotube / graphene composite material prepared by the method has excellent performance and can be used as a conductive additive for lithium-ion batteries , can significantly improve the high-current rapid charge and discharge performance of lithium-ion batteries, and can be used as materials for supercapacitor electrodes and fillers to improve the electrostatic conductivity of paints and coatings.

Description

technical field [0001] The invention belongs to the field of energy and new materials, and in particular relates to a preparation method of a carbon nanotube / graphene composite material. Background technique [0002] As a new type of green energy, lithium-ion batteries are widely used in 3C / 3G mobile phones and notebook computers due to their advantages such as high capacity, high voltage, small size and light weight, long cycle life, wide working range, good safety, and no memory effect. , tablet computers, cameras, etc., electric vehicles, power supply systems for national defense and military equipment, and photovoltaic energy storage systems, energy storage peak-shifting power stations, uninterruptible power supplies, small and medium-sized energy storage systems and many other fields. With the use of secondary batteries, such as lithium-ion batteries, in the fields of electric tools and new energy vehicles, people have put forward higher and higher requirements for the ...

AI Technical Summary

Problems solved by technology

Although the former is cheap, it is difficult to meet the continuous charge and discharge of the battery at a high rate; although the latter has excellent performance, the price is relatively expensive, and the above-mentioned conductive additives only improve the cycle performance of the electrode active material, and cannot improve the lithium battery. High-current charge-discharge performance-rate performance of ion battery materials

[0004] At present, carbon nanotubes / graphene has attracted more and more attention due to its unique properties of coupling carbon nanotubes and graphene, but the reports on carbon nanotubes / graphene composites are mainly focused on the role of electrochemical capacitors. Electrode materials (such as CN102530913A, WO2012088697A1), transparent conductive display materials (such as CN102730673A) and other fields; and the following problems exist in the preparation method of carbon nanotube / graphene composite materials: carbon nanotubes are nanoscale materials, Under the action, it is very easy to agglomerate and difficult to disperse; although graphene has high conductivity and extremely high theoretical specific surface area, it is easy to form macroscopic aggregates due to the action of van der Waals force, and the graphene sheets are stacked and distributed in disorder, resulting in The effective specific surface area is reduced, so the preparation of carbon nanotube / graphene composites with excellent performance has become the focus of research

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