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Graphene composite conductive powder and preparation method thereof

A graphene composite, conductive powder technology, applied in circuits, electrical components, battery electrodes, etc., can solve problems such as hindering synergy, low energy consumption, and reducing the conductivity of three-dimensional conductive networks, achieving easy operation and simple process. Effect

Inactive Publication Date: 2017-11-24
NINGBO MORSH TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The whole preparation process is simple, and the energy consumption is low. Due to the strong Coulomb interaction between the graphene and the conductive material, the binding force between the two conductive components is strong, which is conducive to improving the dispersion and utilization of graphene in the electrode. rate, but the presence of surfactants will hinder the synergy between the conductive components, and surfactants will reduce the overall conductivity of the three-dimensional conductive network

Method used

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  • Graphene composite conductive powder and preparation method thereof
  • Graphene composite conductive powder and preparation method thereof

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preparation example Construction

[0028] The invention provides a kind of preparation method of graphene composite conductive powder, which comprises the following steps:

[0029] S1, dissolving conductive carbon material, monomer, initiator, and dopant in an aqueous solution and mixing them uniformly, and obtaining a polymer composite material through in-situ polymerization;

[0030] S2, respectively dispersing the polymer composite material and the graphene material in water, mixing uniformly, and obtaining a graphene composite conductive paste through π-π conjugation; and

[0031] S3, drying the graphene composite conductive paste to obtain graphene composite conductive powder.

[0032] In step S1, the monomer is at least one of aniline, pyrrole and thiophene. The initiator is at least one of ferric chloride, ammonium persulfate and potassium persulfate. The dopant is hydrochloric acid, H 2 SO 4 and at least one of sodium dodecylbenzenesulfonate.

[0033] The mass ratio of the monomer to the conductive...

Embodiment 1

[0048] (1) Under the condition of ice-water bath, add 150ml 1mol / L hydrochloric acid solution, 9.312g aniline and 46.56g conductive carbon black (SP) into the flask and mix well, add dropwise 100mL aqueous solution containing 22.818g ammonium persulfate as polymerization reaction The initiator was stirred and reacted in the dark for 24 hours, then filtered, washed and dried to obtain a polymer composite material.

[0049] (2) Disperse the above-mentioned polymer composite material and graphene material in water according to the mass ratio of 1:1, configure a mixed solution with a mass fraction of 3%, stir and disperse the mixed solution evenly, and obtain self-assembled graphene / SP composite conductive Slurry, finally add ammonium carbonate to the mixed solution, the mass ratio of ammonium carbonate to graphene material is 1:20, stir and disperse evenly.

[0050] (3) Spray-dry the above-mentioned graphene / SP composite conductive paste, the air inlet temperature of spray drying...

Embodiment 2

[0054] (1) Under ice-water bath conditions, add 150ml 1mol / L hydrochloric acid solution, 9.312g aniline and 4.656g conductive carbon black SP into the flask and mix evenly, and dropwise add 100mL aqueous solution containing 22.818g ammonium persulfate as the initiation of the polymerization reaction agent, stirred and reacted in the dark for 24 hours, filtered, washed, and dried to obtain a polymer composite material.

[0055] (2) Disperse the graphene material and the above-mentioned polymer composite material in water according to the mass ratio of 1:0.1, configure a mixed solution with a mass fraction of 2%, stir and disperse the mixed solution evenly, and obtain a self-assembled graphene / SP composite conductive Slurry, finally add ammonium oxalate to the mixed solution, the mass ratio of ammonium oxalate to graphene material is 1:10, stir and disperse evenly.

[0056] (3) The above-mentioned graphene / SP composite conductive paste is spray-dried, the air inlet temperature o...

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Abstract

The invention relates to graphene composite conductive powder. The graphene composite conductive powder comprises a graphene material and a macromolecule composite material, wherein the macromolecule composite material is a conductive macromolecule compound formed and obtained on the surface of conductive carbon material in an in situ polymerization manner through monomers; the graphene material is tightly combined with the macromolecule composite material through pi-pi conjugate action between the graphene material and the conductive macromolecule compound in the macromolecule composite material; and the conductive macromolecule compound is at least one of polyaniline, polypyrrole and polythiophene. The invention also provides a preparation method of the graphene composite conductive powder.

Description

technical field [0001] The invention relates to a conductive agent for lithium ion batteries, in particular to a graphene composite conductive powder and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific capacity, stable discharge, small size, light weight, no memory effect, safety, long life, and environmental friendliness. They are used in portable electronic devices, electric vehicles, space technology, and defense industries. The field shows broad application prospects. The positive electrode active material of lithium ion battery is generally a transition metal oxide, such as: LiCoO 2 、LiNi x co (1-x) o 2 and spinel LiMn 2 o 4 etc., and the transition metal phosphate LiMPO 4 . These transition metal oxides are generally semiconductors or insulators, and the electrical conductivity is generally low. As a result, the capacity is often difficult to fully exert when discharge...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 秦志鸿刘鹏赵永胜周旭峰刘兆平
Owner NINGBO MORSH TECH
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