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Water-based conductive ink of a lithium-ion battery

A lithium-ion battery and conductive ink technology, applied in the direction of ink, electrode carrier/current collector, application, etc., can solve the complicated coating process of water system slurry and NMP system slurry, and the effect of enhancing the internal resistance of current collector bonding is not obvious , It is unfavorable to switch between different formulas, and achieve the effects of low internal resistance, enhanced adhesive performance, and reduced contact resistance

Active Publication Date: 2012-01-25
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because both coatings contain active materials, the active materials must be the same, which is not conducive to switching between different formulations, increasing the process, and has no obvious effect on enhancing the adhesion of current collectors and reducing internal resistance.
There are also some that print the slurry without active substances first, but this kind of coating is either not resistant to water or NMP, and cannot take into account the coating process of water system slurry and NMP system slurry.

Method used

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  • Water-based conductive ink of a lithium-ion battery
  • Water-based conductive ink of a lithium-ion battery
  • Water-based conductive ink of a lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of water-based conductive ink:

[0043] The water-based conductive ink slurry is based on dry weight percentage, 0.2% sodium carboxymethylcellulose (CMC-Na) is used as a water-soluble polymer thickener, 9.8% polyacrylic acid (PAA) is used as a water-based dispersant, 50% butyl As water-based latex, benzene latex (SBR) has a solubility parameter of 17 (J / cm3) 1 / 2, 40% acetylene carbon black (SP) as the conductive carbon black, the solvent is water, and water accounts for 85% of the total slurry. First, add water, sodium carboxymethyl cellulose, and polyacrylic acid into the stirring grinder according to the above formula, and dissolve completely in a vacuum state, then add conductive carbon black into the already dissolved water-based polymer solution according to the formula, Stir and grind quickly until the particle size is below 5 μm, finally add styrene-butadiene latex according to the formula, stir evenly in a vacuum at a slow speed (in order to prevent...

Embodiment 2

[0053] The difference from Example 1 is that: the water-based conductive ink slurry is in dry matter weight percent, and 0.2% hydroxyethyl cellulose and 0.8% carboxymethyl cellulose sodium (CMC-Na) are used as water-soluble macromolecular thickeners , 5% polyacrylic acid (PAA) as water-based dispersant, 45% styrene-butadiene latex (SBR) as water-based latex, 49% conductive carbon fiber as conductive carbon black, solvent is water, water accounts for 75% of total slurry weight. Other than that, the others are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0055] Difference with embodiment 1 is: the water-based conductive ink slurry is in dry material weight percent, 2% carboxymethylcellulose sodium (CMC-Na) is as water-soluble polymer thickener, the polyacrylic acid (PAA) of 22.5% ) and 0.5% polyacrylate (PAE) as water-based dispersant, 30% styrene-butadiene latex (SBR) and 10% polyethylene latex (PE) as water-based latex, 30% acetylene carbon black and 5% conductive carbon fiber as conductive carbon Black, the solvent is water, and water accounts for 85% of the total slurry weight. Other than that, the others are the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to the technical field of a lithium-ion battery, in particular to water-based conductive ink of the lithium-ion battery. Dry materials mainly comprise (by weight percentage): 0.2-2 percent of water-soluble polymer thickener, 5-25 percent of water-based dispersant, 30-70 percent of conductive carbon black and 20-50 percent of non-polar high polymer water-based latex with the solubility parameter delta less than or equal to 18(J / cm3)1 / 2. The solvent adopts water and accounts for 60-90 percent of the total weight of the pulp. The adhesive properties of the adhesive can be enhanced, the adhesive also has the characteristics of water resistance, NMP (nuclear matrix protein) resistance and electrolyte resistance, a conductive network is formed on a current collector under the effect of the adhesive after adding the conductive carbon black, the contact area between the current collector and a film is increased, and the effect of reducing the contact resistance can be achieved. The current collector after printing of the water-based conductive ink is not only suitable for pulp coating of water-based systems, but also suitable for pulp coating of NMP systems. Moreover, the lithium-ion battery has lower internal resistance and longer cycle life.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a water-based conductive ink for lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used as power sources for various mobile devices due to their high energy density, high operating voltage, wide application temperature range, and long cycle life. In the existing production technology, the cells of lithium-ion batteries are generally prepared by first preparing the active material into an oily slurry with N-methylpyrrolidone (NMP) as a solvent and polyvinylidene fluoride (PVDF) as a binder. Or use water as a solvent and styrene-butadiene latex (SBR) as a water-based slurry of a binder to make a diaphragm slurry, and then apply it on the current collector to make a pole piece. Positive electrode active materials include lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, lithium nickel manganese oxide and other t...

Claims

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Application Information

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IPC IPC(8): C09D11/10H01M4/66C09D11/52
CPCY02E60/12Y02E60/10
Inventor 赖旭伦梅铭邓耀明柳娜许瑞
Owner DONGGUAN AMPEREX TECH
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