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Preparation method and application of graphene conductive paste

A technology of conductive paste and graphene, which is applied in the direction of conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problems of graphene stacking and curl-limited performance, and achieve improved electrochemical performance and high Efficient conductive network, less defects

Inactive Publication Date: 2019-12-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combination of graphene and carbon tubes is more prone to stacking and curling of graphene, which limits its performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of sheet diameter 5um graphene slurry adopts the steps of the inventive method as follows:

[0029] Step 1, using a jet mill to pulverize the raw flake graphite with a purity of ≥98% to a sheet diameter of 5um, and screen to obtain flake graphite with a uniform sheet diameter of small sheet diameter;

[0030] Step 2, the flake graphite after pulverizing is uniformly mixed with nitric acid, perchloric acid, acetic acid and potassium permanganate, and fully reacted in a water bath at 100°C. The mass ratio of flake graphite, nitric acid, perchloric acid, acetic acid and potassium permanganate is 1:0.5:1.6:0.6:0.4;

[0031] Step 3, adding deionized water to the reaction solution of step 2 to dilute and wash, filter, and dry at 50°C for 3 hours;

[0032] Step 4, placing the above-mentioned dried powder in a muffle furnace, and heating at 900° C. for 10 s to obtain a graphene precursor;

[0033] Step 5. Add an appropriate amount of N-methylpyrrolidone to the...

Embodiment 2

[0037] The preparation of sheet diameter 10um graphene slurry adopts the steps of the inventive method as follows:

[0038] Step 1. Use a jet mill to pulverize raw graphite flakes with a purity ≥ 98% to a sheet diameter of 10 μm, and screen to obtain flake graphite with a uniform sheet diameter and small diameter.

[0039] Step 2. Mix the pulverized graphite flakes evenly with nitric acid and potassium permanganate, and fully react in a water bath at 100°C. The mass ratio of graphite flakes, nitric acid, and potassium permanganate is 1:2:0.15;

[0040] Step 3, adding deionized water to the reaction solution of step 2 to dilute and wash, filter, and dry at 50°C for 3 hours;

[0041] Step 4, placing the above-mentioned dried powder in a muffle furnace, and heating at 900° C. for 10 s to obtain a graphene precursor;

[0042] Step 5. Add an appropriate amount of N-methylpyrrolidone to the precursor prepared above to make the solid content 3%, and ultrasonically vibrate for 30 min...

Embodiment 3

[0046] The preparation of sheet diameter 15um graphene slurry adopts the steps of the inventive method as follows:

[0047] Step 1. Use a jet mill to pulverize raw graphite flakes with a purity of ≥98% to a sheet diameter of 15 μm, and screen to obtain flake graphite with a uniform sheet diameter and small diameter.

[0048] Step 2. Mix the pulverized graphite flakes with perchloric acid, phosphoric acid, and chromium trioxide evenly, and fully react in a water bath at 100°C. The mass ratio of graphite flakes, perchloric acid, phosphoric acid, and chromium trioxide is 1:3:1.5: 0.8;

[0049] Step 3, adding deionized water to the reaction solution of step 2 to dilute and wash, filter, and dry at 50°C for 3 hours;

[0050] Step 4, placing the above-mentioned dried powder in a muffle furnace, and heating at 900° C. for 10 s to obtain a graphene precursor;

[0051] Step 5. Add the precursor prepared above to N-methylpyrrolidone to make the solid content 3%, and ultrasonically vib...

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Abstract

The invention relates to a preparation method and application of graphene conductive paste. The graphene conductive paste is a compound of graphene and NMP (N-methylpyrrolidone). The method comprisesthe steps of: adopting a jet mill for crushing and screening raw material crystalline flake graphite; adding an oxidizing agent and an intercalating agent into the crushed raw materials according to acertain ratio for uniform mixing, and fully reacting in a water bath; repeatedly washing the reaction solution with deionized water, and performing centrifuging and drying; performing high-temperature puffing treatment on the dried powder to obtain a precursor; and finally, adding NMP into the precursor, and carrying out ultrasonic treatment for a certain time to obtain the graphene conductive paste. The graphene in the slurry has the characteristics of a small sheet diameter (less than or equal to 20 microns, controllable sheet diameter), the low defect and porosity. The key technical problem that graphene is used as a lithium battery positive electrode conductive agent in engineering application at present is solved. The preparation method is simple, low in cost and suitable for engineering production. The prepared graphene slurry and the carbon nanotube slurry are compounded as a conductive additive to be applied to the cathode of the lithium battery, so that the energy density andthe rate capability of the lithium battery can be remarkably improved.

Description

technical field [0001] The invention relates to a preparation method and application of graphene conductive paste, belonging to the technical field of battery manufacturing. Background technique [0002] Graphene is a new type of two-dimensional nanomaterial with super conductive properties and is currently the best conductive material. At the same time, it has ultra-high electron mobility (200000cm 2 / V.S), as a conductive additive added to the positive electrode of lithium batteries, will greatly improve the conductivity of the positive electrode material, can effectively shorten the transmission path of electrons during battery charging and discharging, and speed up the transmission speed of both. This is of great significance for improving the energy density, rate performance, and cycle life of lithium batteries. However, graphene is currently used as a conductive additive in the positive electrode of lithium batteries, and there are the following engineering technical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01B1/24
CPCH01B1/24H01M4/625Y02E60/10
Inventor 南文争燕绍九王晨王继贤
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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