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Graphene conductive paste special for lithium battery and preparation method of graphene conductive paste

A technology of graphene and conductive paste, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity, achieve low cost, enhance conductivity and rate charge and discharge performance, and reduce investment

Active Publication Date: 2017-11-03
王玉良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of poor electrical conductivity of the current lithium battery cathode material, the present invention provides a special graphene conductive paste containing a network structure for lithium batteries and a preparation method thereof

Method used

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Examples

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Effect test

Embodiment 1

[0034] (1) Mix 20 parts by weight of expanded graphite and 1 part by weight of sodium polyacrylate as a dispersant to form an abrasive, put it into a disc grinder for grinding, and then disperse ultrasonically for 20 minutes at a frequency of 40-60KHz to obtain a uniform dispersion mixture A;

[0035](2) Add 1 part by weight of modifier stearic acid to mixture A, and continue grinding in a grinder for 30 minutes to obtain mixture B;

[0036] (3) Add 2 parts by weight of a cross-linking agent to the mixture B, and continue grinding in the grinder for 30 minutes, while controlling the pressure at 2 MPa and maintaining the temperature at 120°C for 1 hour, so that the graphene flakes are cross-linked into a network structure, and the mixture C is obtained ; The cross-linking agent is prepared from acrylic acid and sulfur at a mass ratio of 1:0.5.

[0037] (4) Mix the mixture C with 70 parts by weight of the solvent tetrahydrofuran evenly, and disperse in a homogenizer for 30 minu...

Embodiment 2

[0041] (1) Mix 15 parts by weight of graphite flakes and 1 part by weight of polyvinylpyrrolidone as a dispersant to form an abrasive, put it into a grinder for grinding, and then ultrasonically disperse at a frequency of 60KHz for 40 minutes to obtain a uniformly dispersed mixture A;

[0042] (2) Add 2 parts by weight of modifier titanate coupling agent to mixture A, and continue to grind in the grinder for 60 minutes to obtain mixture B;

[0043] (3) Add 1 part by weight of cross-linking agent to the mixture B, continue to grind in the grinder for 30 minutes, while controlling the pressure at 3 MPa, and maintaining the temperature at 125°C for 2 hours, so that the graphene flakes are cross-linked into a network structure, and the mixture is obtained C; The crosslinking agent is prepared from N-methylolacrylamide and sulfur at a mass ratio of 1:0.8.

[0044] (4) Mix mixture C and 80 parts by weight of solvent N-methylpyrrolidone evenly, and disperse in a homogenizer for 40 mi...

Embodiment 3

[0047] (1) Mix 10 parts by weight of conductive graphite and 2 parts by weight of dispersant sodium carboxymethyl cellulose into a grinding material, put it into a gear grinder for grinding, and then disperse it ultrasonically for 25 minutes at a frequency of 40KHz to obtain a uniformly dispersed mixture A ;

[0048] (2) Add 3 parts by weight of modifier aluminate coupling agent to mixture A, and continue grinding in the grinder for 40 minutes to obtain mixture B;

[0049] (3) Add 2 parts by weight of a cross-linking agent to the mixture B, and continue grinding in the grinder for 30 minutes, while controlling the pressure at 2 MPa and maintaining the temperature at 120°C for 1 hour, so that the graphene flakes are cross-linked into a network structure, and the mixture C is obtained ; The cross-linking agent is prepared with divinylbenzene and sulfur at a mass ratio of 1:0.5.

[0050] (4) Mix mixture C with 75 parts by weight of solvent N-octylpyrrolidone evenly, and disperse...

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Abstract

The invention provides network structure-containing graphene conductive paste special for a lithium battery and a preparation method of the graphene conductive paste. Graphite is thinned to nanoscale graphene by a mechanical stripping means, network-structure graphene is obtained by modification and crosslinking on a surface of the graphene under enough fineness and uniform conditions, and the graphene conductive paste is formed by using a dispersing agent during the thinning process. The graphene conductive paste is used in a lithium battery positive electrode material and is easy to disperse, the conductivity and the rate charge-discharge performance of an electrode material are remarkably improved, the irreversible capacity is reduced, and the cycle stability of the battery is improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium batteries, and in particular relates to a special graphene conductive paste for lithium batteries and a preparation method thereof. Background technique [0002] With the reduction of natural resources and the aggravation of environmental pollution, when the country regards energy conservation and emission reduction as a breakthrough in adjusting the economic structure, seeking new energy sources to replace fossil fuels has become the focus of attention. The demand for energy in modern society has greatly promoted the development of energy storage technology. As the most successful energy storage device, lithium batteries have high energy density, long service life, low self-discharge rate, strong environmental adaptability, and good cycle performance. Many advantages such as high safety factor have entered people's field of vision more and more, and have been widely used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393Y02E60/10
Inventor 陈庆曾军堂
Owner 王玉良
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