Technology for dispersing carbon nanotubes in lithium ion battery slurry

Abstract

The invention relates to the technical field of lithium ion batteries and especially relates to a technology for dispersing carbon nanotubes in lithium ion battery slurry. The technology comprises the following steps of 1, carbon nanotube conductive paste preparation, 2, polyvinylidene fluoride glue solution preparation, and 3, lithium ion battery slurry preparation: (1), mixing the polyvinylidene fluoride glue solution and the carbon nanotube conductive paste, (2), adding lithium cobaltate into the mixture for the first time and (3), adding lithium cobaltate and the polyvinylidene fluoride glue solution into the mixture obtained by the step (2) for the second time. The technology improves carbon nanotube dispersion uniformity and solves the problem of too fast agglomeration of the carbon nanotubes and the problem of a too fast rate of lithium ion battery slurry settlement. The carbon nanotubes are uniformly dispersed in the lithium ion battery slurry so that the pole piece of the lithium ion battery is smooth in lithium ion battery slurry coating and thus the pole piece of the lithium ion battery does not have obvious granular feel and has good electroconductivity.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a carbon nanotube dispersion process for lithium ion battery slurry. Background technique [0002] Due to their unique structure and excellent performance, carbon nanotubes are widely used in electronic devices, energy storage devices, structural and functional composite materials and other fields. Carbon nanotubes have high specific surface area, high aspect ratio, and excellent mechanical, electrical, and thermal properties. They are considered to be ideal fillers for polymer materials, which can enhance or improve the electrical and thermal conductivity of polymers. However, due to the strong van der Waals interaction between carbon nanotubes, they are usually easy to agglomerate to form large tube bundles, which are difficult to disperse, which greatly restricts the exertion and application of their excellent performance. [0003] In the prior art lithium-ion b...

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Problems solved by technology

However, due to the strong van der Waals interaction between carbon nanotubes, they are usually easy to agglomerate to form large tube bundles, which are difficult to disperse, which greatly restricts the exertion and application of its excellent performance.

[0003] In the prior art lithium-ion battery slurry, the content of carbon nanotubes is approximately 1.5% to 3%. Since the content of carbon nanotubes is not high enough, the conductivity of the lithium-ion battery is affected, and the prepared lithium-ion battery The unit activity content is not ideal

In addition, in the lithium-ion battery slurry in the prior art, the dispersion of carbon nanotubes is not uniform enough, and there is a problem of too fast agglomeration, and the sedimentation rate of the lithium-ion battery slurry is too fast. Therefore, the lithium-ion battery slurry is coated with Due to the uneven dispersion of carbon nanotubes in the cloth process, the lithium-ion battery pole piece is not smooth enough, and there is an obvious grainy feel, and the conductivity of the lithium-ion battery pole piece is poor.