Preparation of carbon nanotube conductive solution for lithium ionic secondary cell

Abstract

The invention provides a method for preparing a carbon nano-tube electric conducting liquid suitable for lithium ion secondary battery anodes. The method comprises the step that the carbon nano-tube are dispersed into a polar solvent by ultra audible sound and a method for preparing the electric conducting liquid by taking the carbon nano-tube as a main conducting functional body is formed. The electric conducting liquid is composed of the electric conducting functional body, polyvinylidene fluoride, accessory ingredients and the polar solvent, the mass ratios of which are as below: the conducting functional body is 0.5-10, the polar solvent is 100, the polyvinylidene fluoride is 0-15, and a small amount of the accessory ingredients is used. The electric conducting liquid disclosed by the invention has good conducting effect and can completely replace the existing electric conducting agents and directly mix with the anode material for forming slurry with more even dispersion of the electric conducting medium, thus improving the pole piece coating process and improving the combination property of the lithium ion secondary batteries.

Description

technical field [0001] The invention relates to a preparation method of carbon nanotube conductive liquid. In particular, it relates to a conductive liquid with carbon nanotubes as the main conductive functional body and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. Since the commercialization of lithium-ion batteries, the research on the conductivity of positive electrode materials has always been a hot spot in the field of battery research, because the positive electrode materials of lithium-ion batteries are usually semiconductor materials, and their conductivity is generally in the range of 10. -1 ~10 -6 S / cm, so the conductivity of electrons between particles is poor, and the conductivity of the active material itself is far from enough. In order to ensure that the electrode has good charge and discharge performance, a certain amount of conductive material is usually added during the ...

AI Technical Summary

Problems solved by technology

[0003] The above methods have the following disadvantages: 1. A uniform conductive network of carbon nanotubes cannot be formed; 2. The dispersion concentration of carbon nanotubes in the formed aqueous solution is not high. If water molecules cannot be removed, it will have a fatal impact on the overall performance of the battery.