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Composite conductive paste as well as preparation method and application thereof

A technology for compounding conductive and conductive materials, which is applied in the direction of conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., and can solve poor dispersion effect of slurry, uneven particle size distribution, particle agglomeration, etc. Problems, achieve the effect of improving the resistivity of the electrode sheet, green and environmentally friendly dispersion, and not easy to reunite

Active Publication Date: 2021-02-05
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another object of the present application is to provide a method for preparing a composite conductive paste to overcome the poor dispersion effect of the paste caused by a single dispersion process, uneven particle size distribution, and particle agglomeration

Method used

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  • Composite conductive paste as well as preparation method and application thereof
  • Composite conductive paste as well as preparation method and application thereof
  • Composite conductive paste as well as preparation method and application thereof

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preparation example Construction

[0051] The preparation method of the commonly used composite conductive paste is generally as follows: firstly, the first conductive particles are mixed with a solvent and then dispersed in a sand mill to obtain the first conductive paste; secondly, the second conductive particles are mixed with a solvent and then added with sand Disperse in a mill to obtain a second conductive paste; finally, mix the first conductive paste with the second conductive paste, add to a sand mill to disperse, and finally obtain a composite conductive paste. Although the above-mentioned method of using a sand mill for multiple feed wet grinding can obtain a conductive paste with uniform properties, the above-mentioned method is complicated to operate and has low grinding efficiency. At the same time, because the conductive particles are mixed in batches, after the slurry is placed for a certain period of time, the conductive particles still have the phenomenon of agglomeration and sedimentation, and...

Embodiment 1

[0083] Composite conductive paste is prepared as follows:

[0084] a. Weigh 0.2wt% of wetting agent polyvinylpyrrolidone K30, 0.5wt% of thickener polyvinylidene fluoride HSV900 and 91.5wt% of solvent N-methylpyrrolidone, and stir at 600r / min under vacuum conditions Time 2h, obtain the uniform transparent glue solution standby;

[0085] b. Weigh 6% of the three-dimensional graphene particles, 1wt% of the composite conductive agent carbon nanotubes and 0.8wt% of the surfactant sodium dodecylbenzenesulfonate, and use a ball mill to dry grind. For dry grinding, 0.8mm zirconia zirconia beads were used at a speed of 300r / min, and the ball milling time was 2h.

[0086] c. Put the glue solution prepared in step (a) and the mixed powder prepared in step (b) into an overhead mixer in turn at 800r / min, stirring for 10min, to obtain a mixed slurry.

[0087] d. The mixed slurry prepared in step (c) was wet-milled with a pin-type sand mill. The diameter of the zirconium beads used in the ...

Embodiment 2

[0092] Composite conductive paste is prepared as follows:

[0093] a. Weigh 0.2wt% of wetting agent polyethylene glycol, 0.5wt% of thickener sodium alginate and 91.5wt% of solvent absolute ethanol, rotate at 600r / min under vacuum conditions, and stir for 2h to obtain Uniform and transparent glue for use;

[0094] b. Weigh 6% of the three-dimensional graphene particles, 1wt% of the composite conductive agent nano-carbon fiber and 0.8wt% of the surfactant sodium dodecylbenzenesulfonate, and use a ball mill to dry grind. Dry grinding uses 0.6mm zirconia zirconia beads at a speed of 300r / min, and the ball milling time is 2.5h.

[0095] c. Put the glue solution prepared in step (a) and the mixed powder prepared in step (b) into an overhead mixer in turn at 800r / min, stirring for 15min, to obtain a mixed slurry.

[0096] d. The mixed slurry prepared in step (c) was wet-milled with a pin-type sand mill. The diameter of the zirconium beads used in the wet-milling was 0.3mm, the rota...

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Abstract

The invention discloses composite conductive paste and a preparation method and application thereof, and belongs to the field of conductive paste. The composite conductive paste comprises a conductivematerial, an auxiliary agent and a solvent; the conductive material comprises three-dimensional graphene particles and a compound conductive agent, the three-dimensional graphene particles are prepared by a method of taking carbon material powder as a substrate to vertically grow graphene, the particle size is 100-300 nm, and the edge graphene thickness is 1-3 atomic layer; the compound conductive agent comprises any one or more of conductive carbon black, carbon nanotubes and carbon nanofibers. The composite conductive paste improves the resistivity of the pole piece and the specific discharge capacity; meanwhile, the conductive material in the composite conductive paste is not easy to agglomerate and has good stability. Another purpose of the invention is to provide a preparation methodof the composite conductive paste so as to overcome the phenomena of poor paste dispersion effect, non-uniform particle size distribution and particle agglomeration caused by a single dispersion process.

Description

technical field [0001] The present application relates to the field of conductive paste, in particular, to a composite conductive paste and its preparation method and application. Background technique [0002] Conductive paste has essential application value in a wide range of fields such as lithium-ion batteries, supercapacitors, and lithium-sulfur batteries. The positive electrode material of lithium ion battery is one of the key materials of the battery. Generally, the positive electrode active material adopts transition metal lithium intercalation oxides, such as cobalt lithium oxide, ferrous lithium oxide, lithium nickel oxide, manganese lithium oxide and three Metamaterials, etc. Most of the positive electrode active materials have problems such as poor conductivity, low electronic conductivity, and low Li+ ion diffusion rate, and there will be problems such as large internal resistance, poor rate cycle performance, low specific capacity, and safety. Therefore, it is...

Claims

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Application Information

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IPC IPC(8): H01B1/24H01B13/00H01M4/62
CPCH01B1/24H01B13/00H01M4/625Y02E60/10
Inventor 于杰慕永彪蒋涛
Owner SONGSHAN LAKE MATERIALS LAB
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