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Conductive additive and preparation method thereof

A conductive additive, graphene technology, applied in electrode manufacturing, circuits, electrical components, etc., can solve problems such as easy stacking, uniform dispersion of unfavorable active particles, and self-winding of carbon nanotubes.

Pending Publication Date: 2020-12-08
CHENGDU YULONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current conductive additives often use carbon black, graphene and carbon nanotubes as conductive additives, but graphene has poor dispersion and is easy to stack. The aspect ratio of carbon nanotubes is generally high, and carbon nanotubes are prone to self-winding. , is not conducive to the uniform dispersion of active particles, affects the electrical conductivity, and causes unstable electrical conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Weigh the following raw materials: 65g graphene, 0.65g copper oxide, 55g carbon nanotubes, 10g sodium dodecanesulfonate solution, 10g sulfuric acid solution, 2.6 nitric acid solution and 50g water, set aside;

[0025] 2) ① Dissolve graphene in 20g of water, then add copper oxide, and stir at 200rpm for 30min to obtain a mixed solution;

[0026] ②Heating the mixed solution in step 2)① to 40°C, reacting for 1h, and then evaporating at 100°C for 20min to obtain a graphene mixed solid;

[0027] ③Heating the graphene mixed solid in step 2)②in a nitrogen atmosphere for 1h, the heating temperature is 400°C, to obtain porous graphene, and set aside;

[0028] 3) Take carbon nanotubes and disperse them by ball milling for 2 hours at a speed of 100 rpm to obtain dispersed carbon nanotubes, which are set aside;

[0029] 4) Mixing the sulfuric acid solution and the nitric acid solution, then adding the carbon nanotubes obtained in step 3), heating to 70°C, reacting for 5h, washi...

Embodiment 2

[0033] 1) Weigh the following raw materials: 70g of graphene, 0.7g of copper oxide, 60g of carbon nanotubes, 12g of sodium dodecanesulfonate solution, 15g of sulfuric acid solution, 3.8g of nitric acid solution and 60g of water, set aside;

[0034] 2) ① Dissolve graphene in 25g of water, then add copper oxide, and stir at 220rpm for 35min to obtain a mixed solution;

[0035] ②Heating the mixed solution in step 2)① to 50°C, reacting for 6h, then evaporating at 110°C for 25min to obtain a graphene mixed solid;

[0036] ③Heating the graphene mixed solid in step 2)②in an argon atmosphere for 8h at a heating temperature of 600°C to obtain porous graphene for subsequent use;

[0037] 3) Take carbon nanotubes and disperse them by ball milling for 5 hours at a ball milling speed of 150 rpm to obtain dispersed carbon nanotubes for later use;

[0038] 4) Mix the sulfuric acid solution and the nitric acid solution, then add the carbon nanotubes obtained in step 3), heat to 75°C, react f...

Embodiment 3

[0042] 1) Weigh the following raw materials: 68g of graphene, 0.68g of copper oxide, 58g of carbon nanotubes, 12g of sodium dodecanesulfonate solution, 12g of sulfuric acid solution, 3g of nitric acid solution and 55g of water, set aside;

[0043] 2) ① Dissolve graphene in 22g of water, then add copper oxide, and stir at 220rpm for 32min to obtain a mixed solution;

[0044] ②Heating the mixed solution in step 2)① to 60°C, reacting for 4h, then evaporating at 108°C for 25min to obtain a graphene mixed solid;

[0045] ③Heating the graphene mixed solid in step 2)②in an argon atmosphere for 5h at a heating temperature of 800°C to obtain porous graphene for subsequent use;

[0046] 3) Take the carbon nanotubes and disperse them by ball milling for 6 hours at a ball milling speed of 110 rpm to obtain dispersed carbon nanotubes for later use;

[0047] 4) Mix the sulfuric acid solution and the nitric acid solution, then add the carbon nanotubes obtained in step 3), heat to 75°C, reac...

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Abstract

The invention belongs to the field of conductive additive processing, and particularly relates to a conductive additive and a preparation method thereof. The conductive additive is prepared from, by weight, 65-75 parts of graphene, 0.65-0.75 part of copper oxide, 55-65 parts of carbon nanotubes, 10-15 parts of a sodium dodecyl sulfate solution, 10-20 parts of a sulfuric acid solution, 2.6-5 partsof a nitric acid solution and 50-70 parts of water; the conductive additive disclosed by the invention is excellent in conductivity, stable in conductivity and good in dispersity, and is easy to disperse and not easy to agglomerate in the mixing and pulping process of the conductive additive and an electrode material, so that the excellent conductivity is ensured to be exerted.

Description

technical field [0001] The invention relates to the field of conductive additive processing, in particular to a conductive additive and a preparation method thereof. Background technique [0002] With the development of industry and the increasingly active human activities, the development of secondary batteries is growing. Lithium-ion batteries have the advantages of high voltage, large capacity, no memory effect and long life, and can be widely used in mobile phones, digital cameras, notebook computers, etc. For digital products and power tools such as electric vehicles and hybrid electric vehicles, people have put forward higher and higher requirements for the power performance of lithium-ion batteries. [0003] Since lithium iron phosphate, lithium manganese oxide, ternary materials and other cathode active materials commonly used in lithium-ion batteries do not have very high conductivity, and there is a large contact resistance between the particles of cathode material...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M10/0525H01M10/42
CPCH01M4/624H01M4/625H01M4/0416H01M10/0525H01M10/4235Y02E60/10
Inventor 卢克涛简帅张路叶锐
Owner CHENGDU YULONG CHEM
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