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Process for dispersing carbon nanotubes in electroconductive adhesive of lithium ion battery

A lithium-ion battery, carbon nanotube technology, applied in battery electrodes, circuits, electrode manufacturing, etc., can solve problems such as affecting production quality, low battery capacity, poor consistency, etc., to achieve superior overall electrical conductivity, uniform electrical conductivity, and improved The effect of capacity

Inactive Publication Date: 2012-10-03
HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the stirring speed of the mixer does not exceed 50 rpm, because the speed is too slow, the CNT (carbon nanotube) cannot be well dispersed, and the CNT (carbon nanotube) is prone to agglomeration, resulting in slurry layering, Settlement, etc., resulting in uneven density of the coating surface or even failure to coat, eventually resulting in low battery capacity, uneven distribution, high internal resistance, poor consistency, etc., affecting production quality and resulting in production waste

Method used

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  • Process for dispersing carbon nanotubes in electroconductive adhesive of lithium ion battery
  • Process for dispersing carbon nanotubes in electroconductive adhesive of lithium ion battery
  • Process for dispersing carbon nanotubes in electroconductive adhesive of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] CNT (carbon nanotube) is used as the conductive agent, KD-1 (hyperdispersant for lithium-ion batteries, available from British Croda Company) and PVP (polyvinylpyrrolidone) with a mass ratio of 1:8 are used as the dispersant, PVDF (Polyvinylidene fluoride) as the binder, NMP (nitromethylpyrrolidone) as the solvent, and add LiFePO with a D50 of 0.4~0.8um 4 (lithium ferrous phosphate), Li with D50 of 0.9~2um 4 Ti 5 o 12 (lithium titanate) and Al with D50 of 2~20um 2 o 3 (Al2O3), in which the mass ratio of conductive agent, dispersant, lithium iron phosphate, lithium titanate, aluminum oxide and solvent is: 1.5:0.2:2:0.5:0.5:95; glue.

[0037] The conductive adhesive preparation process is as follows:

[0038] (1) Mix and stir the conductive agent, dispersant and solvent according to the conventional method to make it fully wet; then, add lithium iron phosphate, lithium titanate, and aluminum oxide, and mix and stir for 30 minutes according to the existing technology...

Embodiment 2

[0043]Using CNT (carbon nanotube) as the conductive agent, KD-1 (hyperdispersant for lithium-ion batteries, available from Croda, UK) and PVP (polyvinylpyrrolidone) with a mass ratio of 1:1 as the dispersant, PVDF (Polyvinylidene fluoride) as the binder, NMP (nitromethylpyrrolidone) as the solvent, and add LiFePO with a D50 of 0.4~0.8um 4 (lithium ferrous phosphate), Li with D50 of 0.9~2um 4 Ti 5 o 12 (lithium titanate) and Al with D50 of 2~20um 2 o 3 (Al2O3), in which the mass ratio of conductive agent, dispersant, lithium iron phosphate, lithium titanate, aluminum oxide, and solvent is 2:0.6:3:1:1:125, and it is prepared into a conductive adhesive .

[0044] The conductive adhesive preparation process is as follows:

[0045] (1) Mix and stir the conductive agent, dispersant and solvent according to the conventional method to make it fully wet; then, add lithium iron phosphate, lithium titanate and aluminum oxide, and mix and stir for 50 minutes according to the existin...

Embodiment 3

[0050] CNT (carbon nanotube) is used as the conductive agent, and KD-1 (hyperdispersant for lithium-ion batteries, available from British Croda Company) and PVP (polyvinylpyrrolidone) with a mass ratio of 8:1 are used as the dispersant, PVDF (Polyvinylidene fluoride) as the binder, NMP (nitromethylpyrrolidone) as the solvent, and add LiFePO with a D50 of 0.4~0.8um 4 (lithium ferrous phosphate), Li with D50 of 0.9~2um 4 Ti 5 o 12 (lithium titanate) and Al with D50 of 2~20um 2 o 3 (Al2O3), in which the mass ratio of conductive agent, dispersant, lithium iron phosphate, lithium titanate, aluminum oxide, and solvent is 3:1.6:5:2:2:150, and the ratio of adhesive The amount added accounts for 3.53% of the mass of the conductive adhesive, and it is formulated into a conductive adhesive.

[0051] The conductive adhesive preparation process is as follows:

[0052] (1) Mix and stir the conductive agent, dispersant and solvent according to the conventional method to make it fully w...

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Abstract

The invention relates to a process for dispersing carbon nanotubes in an electroconductive adhesive of a lithium ion battery. The process comprises the following steps of: firstly, mixing and stirring a solvent, a conductive additive and a dispersant, adding lithium iron phosphate, lithium titanate and aluminium oxide, mixing and stirring uniformly to obtain a pre-mixed electroconductive liquid of the lithium ion battery, and then placing the premixed electroconductive liquid of the lithium ion battery into an internal circulation system composed of a stirring tank and a high-speed dispersing machine for cyclic stirring and dispersing to obtain a uniform electroconductive liquid of the lithium ion battery; and adding a bonding agent into the conductive liquid, and mixing and stirring uniformly to obtain the electroconductive adhesive of the lithium ion battery. According to the invention, by means of controlling the particle size distribution range of the lithium iron phosphate, the lithium titanate and the aluminium oxide, a ball milling effect is produced in a stirring and dispersing process, so that the dispersion uniformity of the carbon nanotubes is increased effectively. Particularly, by adoption of the internal circuit system for cyclic stirring and dispersing, circulation dead angles can be prevented in the stirring tank, and the dispersion effect of the carbon nanotubes can be increased further. The process disclosed by the invention has the advantages of simpleness, convenience for operate, dispersion uniformity of the carbon nanotubes in a slurry preparation process of the lithium ion battery, long-term stability of the viscosity of the slurry and good reproducibility, and is suitable for industrial application.

Description

Technical field: [0001] The invention discloses a dispersion process of carbon nanotubes in lithium-ion battery conductive glue. The invention belongs to the technical field of lithium ion battery preparation. Background technique: [0002] Lithium-ion batteries have the advantages of high specific energy and no memory effect. In recent years, they have been favored by people as a new energy source, and thus develop rapidly. With the maturity of technology, people's requirements for lithium-ion batteries are also getting higher and higher. With the advancement of research, the emergence of CNT (carbon nanotubes) as a conductive agent has brought great development potential to improve the overall performance of lithium-ion batteries. In the process of making lithium-ion batteries, the slurry production is a very important link, but the existing technology has defects in the dispersion of CNT (carbon nanotubes) in the slurry, which limits the superiority of CNT (carbon nanotu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04
CPCY02E60/122Y02E60/10
Inventor 金旭东罗朝晖
Owner HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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