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Modified graphene composite slurry with high dispersion stability and preparation method thereof

A graphene composite and graphene technology, applied in the field of graphene, can solve the problems of restricting graphene's high electrical conductivity, high thermal conductivity, poor graphene dispersibility, etc., and achieve extended stable storage time, simple additives, and stable change rate. small effect

Active Publication Date: 2020-06-23
SHANDONG OBO NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area of ​​graphene, irreversible stacking (stacking) is very easy to occur during processing, which makes the dispersion of graphene poor, which limits the performance of graphene's high electrical conductivity and high thermal conductivity.

Method used

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  • Modified graphene composite slurry with high dispersion stability and preparation method thereof
  • Modified graphene composite slurry with high dispersion stability and preparation method thereof
  • Modified graphene composite slurry with high dispersion stability and preparation method thereof

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preparation example Construction

[0079] The present invention also provides a method for preparing the modified graphene composite slurry as described in any one of the above-mentioned technical solutions, comprising the following steps:

[0080] 1) After grinding and mixing the expanded graphite, the first dispersant, the first defoamer and the first solvent, a mixed solution is obtained;

[0081] 2) After the mixed solution obtained in the above steps is hot-filtered and cleaned using the second solvent, a modified graphene solution is obtained;

[0082] 3) After grinding and mixing the modified graphene, dispersant, rheological additive, defoamer and solvent again, the modified graphene composite slurry is obtained.

[0083] In the present invention, the selection and composition of raw materials in the preparation method of the modified graphene composite slurry, and the corresponding optimization principles, the selection and composition of the corresponding raw materials in the aforementioned modified g...

Embodiment 1

[0120] 1. Using expanded graphite produced by Shandong Oupo New Material Co., Ltd. as raw material, add a certain amount of dimethylformamide, polyvinylpyrrolidone, and polydimethylsiloxane. Wherein each component ratio is as follows:

[0121] Expanded graphite ---- 25 parts

[0122] Dispersant -----10 parts

[0123] Defoamer - 1 part

[0124] Solvent - 64 parts

[0125] 2. Grind the mixture in step 1 in a high-energy sand mill with a rotating speed of 2500r / min, a grinding time of 240min, a zirconium bead filling rate of 70%, and a zirconium bead size of 0.8mm.

[0126] 3. The mixed solution in step 2 is cleaned by hot filtration, and the solvent is tetrahydrofuran, which is a volatile solvent, and the solid content is tested by sampling.

[0127] 4. Add a certain amount of dispersant according to the solid content, dispersant: thin-layer graphene=0.4:4, and heat-dry to obtain a dispersant-modified thin-layer graphene mixture.

[0128] 5. Mix the modified thin-layer grap...

Embodiment 2

[0136] 1. Using expanded graphite as raw material, add a certain amount of methanol and water mixture, polyvinylpyrrolidone, and polydimethylsiloxane. Wherein each component ratio is as follows:

[0137] Expanded graphite ---- 30 parts

[0138] Dispersant ----- 8 parts

[0139] Defoamer ---- 2 parts

[0140] Methanol----30 parts

[0141] Water------30 parts

[0142] 2. Grind the mixture in step 1 in a high-energy sand mill with a rotating speed of 3000r / min, a grinding time of 300min, a zirconium bead filling rate of 60%, and a zirconium bead size of 0.2mm.

[0143] 3. The mixed solution in step 2 is cleaned by hot filtration, and the solvent is tetrahydrofuran, which is a volatile solvent, and the solid content is tested by sampling.

[0144] 4. Add a certain amount of dispersant according to the solid content, dispersant: thin-layer graphene=0.2:4, and heat-dry to obtain a dispersant-modified thin-layer graphene mixture.

[0145] 5. Mix the modified thin-layer graphene...

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Abstract

The invention provides modified graphene composite slurry, which is prepared from the following raw materials in parts by weight: 1-40 parts of expanded graphite, 0.01-10 parts of a first dispersing agent, 0.01-4 parts of a first defoaming agent, 40-99 parts of a first solvent, a dispersing agent, a rheological additive, a defoaming agent, a second solvent and a solvent. According to the compositeslurry provided by the invention, on the basis of not influencing the thermal and electrical properties of the graphene conductive slurry, the dispersion stability of the graphene conductive slurry is greatly improved, and the stable storage time of a product is effectively prolonged. Moreover, the preparation process and equipment are easy to obtain, the additives are simple, the composite slurry is suitable for single-layer graphene, few-layer graphene and graphene nanoplatelets, the problem that graphene is difficult to disperse in downstream application is more effectively solved, and large-scale popularization and application of graphene downstream are facilitated.

Description

technical field [0001] The invention belongs to the technical field of graphene, relates to a modified graphene composite slurry and a preparation method thereof, in particular to a modified graphene composite slurry with high dispersion stability and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields. The main choice of power supply, portable electronic products and new energy vehicles. With the increasing demand for lithium-ion batteries in the field of power batteries, problems such as large internal resistance, low power density, short cycle life, low stability, and easy heating to cause safety accidents have become increasingly prominent and need to be resolv...

Claims

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Application Information

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IPC IPC(8): H01B1/24H01B13/00H01M4/62
CPCH01B1/24H01B13/00H01M4/625Y02E60/10
Inventor 岳利徐亮赵永彬马立军
Owner SHANDONG OBO NEW MATERIAL CO LTD
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