Lithium ion battery copper/aluminum foil coating water-based conductive paste and preparation method thereof

A technology of lithium-ion batteries and conductive pastes, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of battery overall performance degradation, reduction of electron conduction paths, and slow peeling, etc., to improve the surface Effects of tension, enhancement of coating properties, and improvement of electrical conductivity

Inactive Publication Date: 2020-04-14
泰兴市宸泰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the positive / negative active material of the lithium battery is large, so that the contact between the particle and the copper foil / aluminum foil is a point-to-surface contact, which reduces the conduction path of electrons, thereby increasing the resistance. Prolonged, the active material is expected to slowly peel off between the fluids, resulting in a decrease in the overall performance of the battery

Method used

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  • Lithium ion battery copper/aluminum foil coating water-based conductive paste and preparation method thereof
  • Lithium ion battery copper/aluminum foil coating water-based conductive paste and preparation method thereof
  • Lithium ion battery copper/aluminum foil coating water-based conductive paste and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of lithium ion battery copper / aluminum foil is coated with aqueous conductive paste, comprises following component by mass fraction,

[0025]

[0026]

[0027] The specific preparation method is: mix and dissolve methoxy polyethylene glycol acrylate-acrylamide copolymer, acetylacetone, wetting agent and water according to the proportion; add carbon nanotubes and flake graphite powder and stir evenly, and obtain Conductive paste pre-dispersion; the conductive paste pre-dispersion is ground and dispersed to obtain a conductive paste dispersion. When using a sand mill to process the conductive paste pre-dispersion, the fineness is controlled to be less than 2 microns, and the grinding is performed 10 times; The slurry dispersion is mixed with water-based acrylic resin, leveling agent, polyvinyl alcohol, and modified silicone defoamer at high speed to obtain the final conductive paste.

Embodiment 2

[0029] A kind of lithium ion battery copper / aluminum foil is coated with aqueous conductive paste, comprises following component by mass fraction,

[0030]

[0031]

[0032] The specific preparation method is: mix and dissolve methoxypolyethylene glycol acrylate-acrylamide copolymer, ethylenediaminetetraacetic acid, wetting agent and water according to the proportion; add graphene and flake graphite powder and stir evenly, Grinding to obtain a conductive paste pre-dispersion; the conductive paste pre-dispersion is ground and dispersed to obtain a conductive paste dispersion. When using a sand mill to process the conductive paste pre-dispersion, the fineness is controlled to be less than 2 microns, and the grinding is performed 15 times ; The conductive paste dispersion is mixed with water-based acrylic resin, leveling agent, polyvinyl alcohol, and polyether defoamer at high speed to obtain the final conductive paste.

Embodiment 3

[0034] A kind of lithium ion battery copper / aluminum foil is coated with aqueous conductive paste, comprises following component by mass fraction,

[0035]

[0036]

[0037] The specific preparation method is: mix and dissolve methoxy polyethylene glycol acrylate-acrylamide copolymer, ethylenediamine tetraacetic acid, wetting agent and water according to the proportion; add conductive carbon black and flake graphite powder and stir evenly, The colloid mill obtains the pre-dispersion of conductive paste; the pre-dispersion of conductive paste is ground and dispersed to obtain the dispersion of conductive paste. The conductive paste dispersion is mixed with water-based acrylic resin, leveling agent, cellulose nanospheres, and polysiloxane defoamer at high speed to obtain the final conductive paste.

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PUM

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Abstract

The invention discloses lithium ion battery copper / aluminum foil coating water-based conductive paste and a preparation method thereof. The lithium ion battery copper / aluminum foil coating water-basedconductive paste comprises 0.1-4% of a methoxy polyethylene glycol acrylate-acrylamide copolymer, 0.3-1% of a first conductive carbon material, 1-5% of flake graphite powder, 0.1-3% of water-based acrylic resin, 1-5% of a dispersing agent, 0.1-1% of a wetting agent, 0.1-1% of a leveling agent, 0.1-3% of a compatibilizer, 0.1-2% of an antifoaming agent, and the balance of water. The graphite powder is small in particle size, the contact area can be increased, the surface tension of a collector electrode can be improved, the easy coating performance of the collector electrode can be enhanced, meanwhile, the graphite powder can form a conductive network by means of the methoxy polyethylene glycol acrylate-acrylamide copolymer, and good conductivity is achieved.

Description

technical field [0001] The invention relates to the technical field of power battery manufacturing, in particular to a lithium-ion battery copper / aluminum foil coated water-based conductive paste and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, no memory effect, and are safe, reliable, and fast charging and discharging, so they have become the focus of national and enterprise development. Aluminum foil / copper foil current collectors play the role of attaching active materials and conducting electrons in lithium batteries. The particle size of the positive / negative active material of the lithium battery is large, so that the contact between the particle and the copper foil / aluminum foil is a point-to-surface contact, which reduces the conduction path of electrons, thereby increasing the resistance. Prolonged, the active material is expected to slowly peel off between the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/62H01M10/0525
CPCH01M4/666H01M4/663H01M4/668H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 何小龙谭元植李向梅马春印
Owner 泰兴市宸泰新能源科技有限公司
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