Conductive slurry and method of using same to form net shaped carbon thermo-conductive electroconductive network current collector

A technology of conductive paste and conductive network, which is applied in the field of energy storage systems, can solve problems such as poor conductive properties, high cost, and incomplete carbon film coating, and achieve the effect of avoiding thermal aging problems and improving system life

Active Publication Date: 2018-01-12
JIANGSU CNANO TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cost of the above-mentioned several treatment methods is relatively high, and at the same time, most of the carbon formed on the aluminum foil is a point-like discontinuous phase, so each carbon material particle is only used as an interface material between the current collector and the electrical material on the plane, and this type of carbon material generally conducts heat. The temperature is poor, and it is not very helpful for heat dissipation. Therefore, once the heat energy is generated by a large current, the heat cannot be exported, and the carbon film is often incomplete, so that the basic electrical conductivity is not good (such as figure 1 shown)

Method used

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  • Conductive slurry and method of using same to form net shaped carbon thermo-conductive electroconductive network current collector
  • Conductive slurry and method of using same to form net shaped carbon thermo-conductive electroconductive network current collector
  • Conductive slurry and method of using same to form net shaped carbon thermo-conductive electroconductive network current collector

Examples

Experimental program
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Effect test

Embodiment 1

[0028] After mixing 5g of carbon nanotubes, 10g of conductive carbon black, and 2g of flake graphite, soak them in 500ml of 1M hydrochloric acid for pickling for 5 hours, filter the solution of the carbon slurry material, and dissolve the pickled carbon material in water and add 20 g of ethylenediamine was mixed with a ball mill for 5 hours. After mixing, the carbon slurry was heated at 140° C. for 1 hour to carry out cross-linking reaction. After the reaction was completed, excess ethylenediamine was washed away by washing with water three times, and 20 g of PVA (polyvinyl alcohol) was added to dissolve into a carbon slurry with a carbon solid content of 10%, and ultrasonically dispersed for 1 hour to complete the slurry treatment. Coat the slurry on a 20um aluminum foil, control the thickness of the carbon film between 1 and 2um, and bake in an oven at 90°C to complete the carbon-coated aluminum foil.

Embodiment 2

[0030] 4g of carbon nanotubes, 1g of graphene, 10g of conductive carbon black, and 2g of flake graphite are mixed and soaked in 500ml of 1M hydrochloric acid for pickling for 5 hours. After adding 20 g of ethylenediamine to water, it mixed with a ball mill for 5 hours. After mixing, the carbon slurry was heated at 140° C. for 1 hour to carry out cross-linking reaction. After the reaction was completed, the excess ethylenediamine was washed away by washing three times with water, and 20 g of methylcellulose was added to dissolve the carbon slurry with a carbon solid content of 10% for ultrasonic dispersion for 1 hour to complete the slurry treatment. Coat the slurry on a 20um aluminum foil, control the thickness of the carbon film between 1 and 2um, and bake in an oven at 90°C to complete the carbon-coated aluminum foil.

Embodiment 3

[0032] Soak 5g of carbon nanotubes in 400ml of 1M hydrochloric acid for pickling for 5 hours. At the same time, mix 10g of conductive carbon black and 2g of flake graphite and soak in 400ml of 1M sodium hydroxide for pickling for 5 hours. Filter the two carbon slurry materials separately. Wash off the excess acid-base solvent three times. The two filtered carbon materials were prepared into an aqueous solution with a solid content of 10%, and 20 g of PVA (polyvinyl alcohol) was added to dissolve the carbon slurry, and the carbon slurry was ultrasonically dispersed for 1 hour to complete the slurry treatment. Coat the slurry on a 20um aluminum foil, control the thickness of the carbon film between 1 and 2um, and bake in an oven at 90°C to complete the carbon-coated aluminum foil.

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Abstract

The invention discloses a conductive slurry and a method of using the same to form a net shaped carbon thermo-conductive electroconductive network current collector. The conductive slurry is preparedfrom the following raw materials in parts by weight: 4 to 6 parts of carbon nanotube, 8 to 12 parts of conductive carbon black, 1 to 3 parts of flake graphite, and 15 to 25 parts of polyvinyl alcohol.A highly thermo-conductive electroconductive carbon material with at least one dimension and highly thermo-conductive materials that can form a net shape material such as carbon nanotubes, graphene,and the like, are added into common conductive carbon black to form a continuous thermo-conductive electroconductive network coating on a current collector; the coating can provide a heat dissipationeffect for high-rate charge/discharge; at the same time, the electroconductive requirement is satisfied, the heat aging problem of an energy storage system is solved, and the service life of the system is prolonged.

Description

technical field [0001] The invention relates to an energy storage system, in particular to a conductive paste and a method for forming a net-shaped carbon heat-conducting and conducting network current collector. Background technique [0002] Among various power storage systems, temperature changes during charging and discharging have a huge impact on the system. In a high temperature or low temperature environment, it is easy to cause the aging of the power storage material and reduce the overall life. Therefore, how to reduce the temperature in the battery system so that the temperature effect affects the system less is an urgent problem to be solved. In existing energy storage systems, most of them use different metal foils as conductive current collectors, such as foils or mesh structures made of aluminum, copper, stainless steel, etc., to carry electrode materials. There is an interface resistance between the electrode material and the current collector. During rapid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/74H01M4/02
CPCY02E60/10
Inventor 杨智伟蔡韦政郑涛张美杰毛鸥
Owner JIANGSU CNANO TECHNOLOGY CO LTD
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