Composite conductive paste, preparation method and use thereof

A technology of composite conductive and conductive paste, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problems of limiting battery performance, poor dispersion, poor conductivity, etc.

Inactive Publication Date: 2019-05-31
哈尔滨万鑫石墨谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current graphene conductive paste and carbon nanotube conductive paste generally have the problems of poor dispersion and relatively poor conductivity, which limits their improvement in battery performance.

Method used

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  • Composite conductive paste, preparation method and use thereof
  • Composite conductive paste, preparation method and use thereof
  • Composite conductive paste, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] This embodiment provides a composite conductive paste, which includes composite particles made of carbon nanotubes and graphene, a dispersant PVP, and a solvent NMP; wherein, the graphene is prepared by mechanical liquid phase exfoliation The obtained few-layer graphene, the number of layers of the few-layer graphene is 10-20 layers;

[0093] The carbon nanotubes are carbon nanotubes purified at high temperature, and the diameter of the carbon nanotubes is 10nm-20nm.

[0094] The detection results of ICP metal particle impurity content of graphene and high-temperature purified carbon nanotubes in Examples 1-4 of the present invention are shown in Table 1, wherein the unit of the data in Table 1 is ppm.

[0095] Table 1

[0096]

[0097] Preparation:

[0098] (1) Preparation of graphene conductive paste:

[0099] Each small batch produces 100Kg, wherein the ratio of dropping into natural graphite is: graphite: dispersant PVP=5:1, and the solid content of the graphe...

Embodiment 2

[0119] This embodiment provides a composite conductive paste, which includes composite particles made of carbon nanotubes and graphene coated on the surface of the carbon nanotubes, a dispersant PVP, and a solvent NMP; wherein, the The number of layers of the graphene is 5 layers, the diameter of the carbon nanotube is 10nm, and the length of the carbon nanotube is 5 μm to 8 μm;

[0120] The mass ratio of the total mass of the graphene and carbon nanotubes to the dispersant PVP is 5:1.25.

[0121] Preparation:

[0122] (1) Preparation of graphene conductive paste:

[0123] Each small batch produces 100Kg, wherein the ratio of graphite input is: graphite: dispersant PVP=5:1.25, and the solid content of the graphene conductive paste obtained is 4.8%.

[0124] (A): Accurately weigh the solvent NMP=95.2Kg, place it in a stirring tank, weigh the dispersant PVP=0.96Kg, add it into the stirring tank and stir for 20min until the dispersant is completely dissolved in the solvent;

...

Embodiment 3

[0136] The present embodiment provides a composite conductive paste, which includes composite particles made of carbon nanotubes and graphene, a dispersant PVP, and a solvent NMP; wherein, the number of layers of the graphene is 15 layers, The diameter of the carbon nanotubes is 15 nm, and the length of the carbon nanotubes is 5 μm to 8 μm; the mass ratio of the total mass of the graphene and carbon nanotubes to the dispersant PVP is 4:1.

[0137] (1) Preparation of graphene conductive paste:

[0138] Each small batch produces 100Kg, wherein the ratio of input graphite is: graphite: dispersant PVP=4:1, and the solid content of the graphene conductive paste obtained is 5%.

[0139] (A): Accurately weigh the solvent NMP=95Kg, place it in a stirring tank, weigh the dispersant PVP=1Kg, add it into the stirring tank and stir for 60 minutes until the dispersant is completely dissolved in the solvent;

[0140] (B): then take by weighing 4Kg of graphite, it is added in the dispersed ...

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Abstract

The invention relates to a composite conductive paste, a preparation method and use thereof. The composite conductive paste of the invention comprises a composite material composed of a carbon nanotube and grapheme. The grapheme is less-layer graphene (10-20 layers), and the carbon nanotube is a multi-walled carbon nanotube. The composite conductive paste solves the problem that the two nanomaterials including the carbon nanotube and the graphene are difficult to disperse. The prepared composite conductive paste has good electrical conductivity and a resistivity of 32[omega].cm to 35[omega].cm. An electrode pole piece prepared from the composite conductive paste of the invention has high electrical conductivity, can improve the electrical conductivity and the electrochemical performance ofthe whole battery. An assembled battery has good fast charge and discharge performance, good reversibility and stability.

Description

technical field [0001] The invention belongs to the technical field of new conductive materials, and relates to a composite conductive paste, its preparation method and application, in particular to a composite conductive paste containing a material composed of carbon nanotubes and graphene, its preparation method and its use in lithium Uses of ion batteries. Background technique [0002] The application of graphene in lithium-ion batteries is relatively diversified. At present, it has been commercialized as a conductive additive in positive electrode materials to improve the conductivity of electrode materials, increase rate performance and cycle life. At present, a relatively mature application is to make graphene into a conductive paste for coating positive electrode materials such as lithium iron phosphate. At present, the coating slurry for positive electrode mainly includes graphite slurry and carbon nanotube slurry. With the mass production of graphene powder and gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525H01B1/24H01B13/00
CPCY02E60/10
Inventor 杨斌袁国辉何斌刘智良梅佳周晓明
Owner 哈尔滨万鑫石墨谷科技有限公司
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