Preparation and dispersion method and equipment of graphene/carbon nanotube composite conductive paste

Abstract

The invention belongs to the technical field of a lithium ion battery conductive agent, and relates to a preparation method of graphene / carbon nanotube composite conductive paste. The preparation method comprises the following steps of S1, dispersing a dispersing agent in a solvent, adding and uniformly stirring carbon nanotubes, and performing initial grinding and dispersing to form a carbon nanotube dispersion liquid A; S2, dispersing the dispersing agent in the solvent, adding graphene, and performing per-dispersion processing, namely, mechanical stirring is performed until uniform stirring is achieved, and cutting and dispersing are performed by a high-speed cutting machine to form a graphite dispersion liquid B; and S3, clashing two stands of high-voltage liquids of the carbon nanotube dispersion liquid A and the graphite dispersion liquid B in clash equipment in a coaxial opposite runner, namely, the two strands of liquids of the carbon nanotube dispersion liquid A and the graphite dispersion liquid B are combined, a linear carbon tube is embedded into graphene sheet layers to form a carbon tube insertion-layer graphite middle body, extremely high pressure difference (reach 3,000bar) is instantaneously formed when the liquid is released from a nozzle, so that graphite is exploded to form perfect crystal-structure graphene, and meanwhile, the carbon tubes are uniformly arranged on a surface of the graphene to form the graphene / carbon nanotube composite conductive paste C.

Description

technical field [0001] The invention belongs to the technical field of conductive agents for lithium ion batteries, and particularly provides a preparation and dispersion method and equipment for graphene / carbon nanotube composite conductive paste. Background technique [0002] At present, with the development of lithium-ion battery fast charging technology, traditional lithium-ion battery conductive additives such as acetylene black and conductive graphite can no longer meet the needs of materials for fast lithium ion transmission, and new carbon nanotubes and graphene are used as conductive additives It has more excellent electrical conductivity. For example, the theoretical electrical conductivity of carbon nanotubes and graphene can reach 3500S / cm and 5300S / cm respectively. Graphene is a sp2 hybrid carbon six-membered ring planar two-dimensional structure material, and carbon nanotubes can be regarded as a one-dimensional linear structure carbon material formed by graphe...

AI Technical Summary

Problems solved by technology

The conventional method is to simply mix the dispersed carbon nanotube slurry and graphene slurry, but the preparation process of the carbon nanotube slurry and graphene slurry itself is complicated and the process is cumbersome, and the composite slurry after simple mixing is dispersed The two phases of carbon nanotubes and graphene are separated from each other, which affects its performance.

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