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High-performance graphene composite silver paste and preparation method thereof

A graphene composite and high-performance technology, applied in the field of solar cell materials, can solve the problems of unstable performance, complex process, and reduce the high conductivity of graphene, and achieve the effect of stable performance and good flexibility of the film

Pending Publication Date: 2022-01-07
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both the conductive composite silver pastes prepared by the above two patents use nano-metal particles and new conductive materials to reduce the cost of the silver paste, but also bring new problems: (1) redox graphene has a large number of structural defects, The high electrical conductivity of graphene itself is severely reduced. Although the silver content is reduced, the electrical conductivity of the composite silver paste is also reduced; (2) The process is complex and difficult to repeat, and the performance of the silver paste after sintering is not stable enough, which greatly restricts The electrical performance of its electrodes is not conducive to widespread application

Method used

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  • High-performance graphene composite silver paste and preparation method thereof

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preparation example Construction

[0024] The embodiment of the present invention provides a kind of preparation method of high-performance graphene composite silver paste, mainly comprises the following steps:

[0025] S1. Weigh graphite powder, nano-silver paste, glass powder, dendritic organic molecules and organic solvent in sequence according to the proportion; among them, graphite powder 5%-20%, nano-silver paste 50-65%, glass powder 3-5%, 0.5% to 2% of dendritic organic molecules, 8% to 41.5% of organic solvents; graphene and nano-glass powder are induced and driven by functional groups of dendritic organic molecules to form zero-dimensional silver nanoparticles uniformly distributed in the A composite system of point-surface bonding on the surface of two-dimensional graphene nanosheets;

[0026] S2. Mix dendritic organic molecules and graphite powder in an organic solvent, stir evenly, and then add mechanical high-speed stripping equipment, continuously high-density shearing and peeling for 6 hours unde...

Embodiment 1

[0031] A high-performance graphene composite silver paste is composed of the following raw materials in terms of mass percentage: 20% of graphite powder, 65% of nano-silver paste, 5% of glass powder, 2% of dendritic organic molecules, and 8% of organic solvent.

[0032] Wherein: the dendritic organic molecule is polyamide-amine.

[0033] The glass powder is silica.

[0034] The organic solvent is a mixture of ethylene glycol: glycerin in a mass ratio of 1:1.

[0035] A preparation method for high-performance graphene composite silver paste, comprising the following steps:

[0036] (1) Weigh graphite powder, nano-silver paste, silicon dioxide, polyamide-amine and organic solvent in sequence according to the above ratio;

[0037] (2) Mix polyamide-amine and graphite powder in an organic solvent, stir evenly, and then add mechanical high-speed stripping equipment, continuously high-density shearing and peeling for 6 hours under the conditions of rotation speed 3000 rpm, normal ...

Embodiment 2

[0042] A high-performance graphene composite silver paste consists of the following raw materials in terms of mass percentage: 15% graphite powder, 55% nano-silver paste, 4% glass powder, 1.5% dendritic organic molecules, and 24.5% organic solvent.

[0043] Wherein: the dendritic organic molecule is polyethylene glycol-polyamide-amine.

[0044] The glass powder is alumina.

[0045] The organic solvent is a mixture of glycerin: terpineol: turpentine in a mass ratio of 2:1:1.

[0046] A preparation method for high-performance graphene composite silver paste, comprising the following steps:

[0047] (1) Weigh graphite powder, nano-silver paste, silicon dioxide, polyamide-amine and organic solvent in sequence according to the above ratio;

[0048] ⑵Mix polyethylene glycol-polyamide-amine and graphite powder in an organic solvent, stir evenly, and then add mechanical high-speed stripping equipment, continuous high-density shearing and peeling at a speed of 3000 rpm, normal temperat...

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Abstract

The invention belongs to the technical field of silver paste and relates to high-performance graphene composite silver paste. The graphene composite silver paste is prepared from the following raw materials in percentage by mass: 5%-20% of graphite powder, 50%-65% of nano silver paste, 3%-5% of glass powder, 0.5%-2% of dendritic organic molecules and 8%-41.5% of an organic solvent. Meanwhile, the invention further discloses a preparation method of the graphene composite silver paste. According to the high-performance graphene composite silver paste and the preparation method thereof, graphene is uniformly dispersed by utilizing the steric hindrance effect of a three-dimensional topological structure of a dendritic organic molecule, and meanwhile, abundant active sites provided by an end group functional group of the dendritic molecule,and nano-silver particles form a coordination compound of the dendritic organic molecule, so that the silver particles are uniformly attached to a graphene two-dimensional nanosheet, so that the compatibility of the two phases is improved, and the interface energy is remarkably reduced. According to the obtained graphene composite silver paste, the content of silver powder in existing commercial silver paste can be greatly reduced, the material cost is greatly reduced, and meanwhile the ultrahigh conductivity of the composite silver paste is kept.

Description

technical field [0001] The invention relates to the field of solar cell materials, in particular to a high-performance graphene composite silver paste and a preparation method thereof. Background technique [0002] Conductive silver paste is widely used in the production of various electronic components, such as integrated circuits, electric heating films, especially in the preparation of photovoltaic solar cells, and the assembly of batteries into photoelectric conversion power generation components. Printability, together with strong bonding to substrates, becomes one of the key materials for scaling up photovoltaic solar energy. Therefore, reducing the cost of conductive silver paste has decisive significance for reducing the overall product cost and realizing the large-scale production and wider application of solar cells. [0003] Reducing the silver content in conductive silver paste while maintaining its high conductivity is an effective way to reduce the cost of sil...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/18H01B1/22H01B1/24H01B13/00
CPCH01B1/16H01B1/18H01B1/22H01B1/24H01B13/00
Inventor 拜永孝陈虎强
Owner LANZHOU UNIVERSITY
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