High-purity water-based carbon nanotube paste

Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, electrolytes and other components, among which the electrodes are mainly composed of active materials, binders, conductive agents and current collectors. At present, the conventional electrode production process is a wet production process...

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Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, electrolytes and other components, among which the electrodes are mainly composed of active materials, binders, conductive agents and current collectors. At present, the conventional electrode production process is a wet production process, which generally involves first mixing the active materials, conductive agents and other components evenly, then adding PVDF and other glues and fully dispersing them and coating them on the current collector, and then drying, rolling and slitting them for winding of the battery cells. The characteristics of the slurry have a significant impact on the subsequent electrode production and battery performance, so how to obtain a slurry with good performance is crucial for the production of lithium-ion batteries.

The stability of the slurry mainly refers to the anti-agglomeration and anti-precipitation characteristics. The slurry agglomeration is mainly affected by the weak van der Waals force between the active material particles in the slurry. In some rare cases, due to the static electricity on the surface of the slurry particles, they will attract each other and cause serious agglomeration. Especially in water-based slurries, stronger hydrogen bonds and electrostatic forces will make the slurry more likely to agglomerate, so some dispersants are usually added to the high-purity water-based carbon nanotube paste to form an electrostatic barrier in the slurry to prevent the slurry from agglomerating. At the same time, high-purity water-based carbon nanotube paste also faces problems such as poor wettability with the current collector and corrosion of Al foil by the positive electrode water-based slurry. Although water-based slurries have a series of problems, since water-based slurries do not require solvent recovery, they can reduce equipment investment and operating costs. Therefore, water-based slurries are still widely used, especially at present, graphite negative electrodes basically use water-based slurry systems, and the application of positive electrode water-based slurry systems is also continuously promoted.

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