Carbon nano tube and carbon black composite dispersing liquid and preparation method thereof

Abstract

The invention provides carbon nano tube and carbon black composite dispersing liquid which comprises 1.0-5.0% of carbon nano tube, 1.0-10% of carbon black, 0.5-1.5% of dispersing agent and 88-95% of solvent. The invention further provides a preparation method of the carbon nano tube and carbon black composite dispersing liquid. The method comprises the steps of performing carbon nano tube grinding dispersion on the composite dispersing liquid in an organic solvent or water containing the dispersing agent by a horizontal sand mill, performing composite dispersion on dispersed carbon nano tube dispersing liquid and the carbon black by a high-speed disperser, and preparing the dispersing liquid with solid content of 6.0-10.0%. The composite dispersing liquid is uniform and stable, and has good flowability, dispersity and glossiness; when the composite dispersing liquid serves as a conductive agent of a lithium ion battery anode, the addition amount is greatly reduced and the comprehensive performance of a battery cell is greatly improved; and the preparation method is simple and practical, facilitates long-term stability, and is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the field of carbon nanotube materials, in particular to a composite dispersion of carbon nanotubes and carbon black and a preparation method thereof. Background technique [0002] At present, the application of carbon nanotubes in lithium-ion batteries is mostly limited to the field of capacity batteries, and has not been able to achieve good performance in the field of high-rate high-current charge and discharge. And because the price of carbon nanotubes is far higher than that of conventional carbon black conductive agents, when producing lithium-ion batteries, manufacturers only add a small amount of carbon nanotubes to save costs. [0003] With the rapid development of smart phones, pure electric vehicles and other application markets, lithium-ion batteries are gradually required to have higher capacity, higher rate, longer life, and safer and more stable requirements. Under the premise that there is no major breakthrough...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of the preparation of the existing carbon nanotube and carbon black composite conductive agent, the present invention first carries out dry mixing of carbon nanotube and carbon black and then disperses, so that the requirements for dispersing equipment are high, the conductivity is not good, and the amount of dispersant used is large, which cannot Due to technical problems such as the preparation of high solid content dispersions, the dispersion method of preferentially dispersing carbon nanotubes and then compounding with carbon black can be used to prepare a special composite conductive agent that is more suitable for high-rate charging and discharging.

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