A kind of carbon nanotube conductive paste and preparation method thereof

Abstract

The invention belongs to the technical field of electrochemical materials, and particularly relates to carbon nanotube conductive slurry and a method for preparing the carbon nanotube conductive slurry. The carbon nanotube conductive slurry is mainly composed of carbon nanotubes, other conductive fillers, dispersing auxiliaries and a solvent, and the carbon nanotube conductive slurry comprises the components, by mass, 0.5-15% of the carbon nanotubes, 0.1-2% of the other conductive substances, 0.1-5% of the dispersing auxiliaries and the balance being solvent. The method for preparing the carbon nanotube conductive slurry includes the steps that firstly the dispersing auxiliaries are dissolved in the solvent, then, the carbon nanotubes and the other conductive fillers are added under the stirring condition, after the carbon nanotubes and the other conductive fillers are fully immersed, a sand mill is utilized to grind the slurry, and the stable and dispersing carbon nanotube conductive slurry can be obtained after the slurry is grinded for a few hours. The method is simple and free of damaging the structures and the electrical conductivity of the carbon nanotubes, the prepared carbon nanotube conductive slurry has good electrical conductivity and is stable and uniform in property, and the stability of the slurry is larger than 90% after standing for 3 months.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, and in particular relates to a carbon nanotube conductive slurry and a preparation method thereof. The material can be used as a conductive agent in the positive or negative electrodes of lithium-ion secondary batteries and capacitors. Background technique [0002] In the preparation process of lithium-ion secondary batteries and capacitors, it is often necessary to add a certain amount of conductive agent to the positive and negative electrode ingredients. The conductive agent can effectively contact with the positive and negative active materials to form a good conductive network, thereby improving the rate performance of the battery. However, adding too much conductive agent will inevitably reduce the content of electrode active materials and reduce the capacity and energy density of the battery. For high-performance electronic devices, it is particularly important to choose...

AI Technical Summary

Problems solved by technology

Although chemical methods such as strong oxidizing acid treatment methods can obtain carbon nanotubes with good dispersion properties, strong acids will also destroy the structure of carbon nanotubes and shorten carbon nanotubes, thereby affecting the conductivity of carbon nanotubes and their use as electrical conductors. agent performance

Physical methods such as the use of more ultrasonic treatment methods have low efficiency, poor dispersion effect, and stability, and the concentration of the obtained carbon nanotube dispersion is lower than 5mg / mL, so it is difficult to prepare carbon nanotube dispersion slurry on a large scale

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