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Highly dispersible silver powder for preparing solar cell front silver paste and preparation method thereof

A technology of solar cells and high dispersibility, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of low controllability of flake nano-silver, easy stacking and agglomeration of flake silver powder, poor dispersibility, etc. Achieve the effect of improving battery efficiency, good conductivity, and reducing resistance

Active Publication Date: 2022-03-22
山东建邦胶体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned methods for preparing flaky nano-silver are not highly controllable, and the prepared flaky silver powder is prone to stacking and agglomeration, and the dispersibility is not good.

Method used

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  • Highly dispersible silver powder for preparing solar cell front silver paste and preparation method thereof
  • Highly dispersible silver powder for preparing solar cell front silver paste and preparation method thereof
  • Highly dispersible silver powder for preparing solar cell front silver paste and preparation method thereof

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preparation example Construction

[0029] The preparation method of the highly dispersible silver powder for the preparation of the solar cell front silver paste provided by the invention comprises the following steps:

[0030] S1. prepare silver salt solution, organic ligand solution and reductant solution respectively, comprise ferrous sulfate in the described reductant solution;

[0031] S2. adding an acid solution to the silver salt solution to regulate the pH value of the silver salt solution to 5-7;

[0032] S3. be (1~2):1 by the mol ratio of ferrous sulfate and silver salt, in the described silver salt solution that step S2 obtains, synchronously dropwise add described organic ligand solution and reducing agent solution, after dropwise , stirred and reacted for a preset time, and then separated, washed and dried to obtain the highly dispersible silver powder for the preparation of the solar cell front silver paste.

[0033] By adopting the above technical scheme, the silver salt solution is adjusted to ...

Embodiment 1

[0043]A kind of preparation method of highly dispersible silver powder for solar cell front silver paste preparation, comprises the following steps:

[0044] S1. prepare respectively the silver nitrate solution of 5mg / mL, the glycine solution of 5mg / mL and the ferrous sulfate solution of 10mg / mL;

[0045] S2. adding an acid solution to the silver nitrate solution to regulate its pH value to 5.5;

[0046] S3. be 1.5:1 by the mol ratio of ferrous sulfate and silver nitrate, glycine and ferrous sulfate mol ratio are 0.6:1, synchronously drip described glycine solution and sulfurous acid in the described silver nitrate solution that step S2 obtains The dropping rate of the iron solution and the ferrous sulfate solution is 3 times that of the glycine solution. After the dropwise addition, stir and react for 1 hour, then centrifuge, wash and dry to obtain the highly dispersible silver powder for the preparation of the solar cell front silver paste.

Embodiment 2

[0048] A kind of preparation method of highly dispersible silver powder for solar cell front silver paste preparation, comprises the following steps:

[0049] S1. prepare the silver nitrate solution of 5mg / mL, the glycine solution of 5mg / mL and the ferrous sulfate solution of 10mg / mL and the ascorbic acid solution of 10mg / mL respectively;

[0050] S2. adding an acid solution to the silver nitrate solution to regulate its pH value to 5.5;

[0051] S3. be 1.5:1 by the mol ratio of ferrous sulfate and silver nitrate, the mol ratio of ascorbic acid and silver nitrate is 0.15:1, glycine and ferrous sulfate mol ratio are 0.6:1, to the described silver nitrate that step S2 obtains The glycine solution and the ferrous sulfate solution were added dropwise into the solution synchronously. After the dropwise addition was completed, the reaction was stirred for 1 hour, and then centrifuged, washed and dried to obtain the highly dispersible silver powder for preparing the front silver past...

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Abstract

The invention provides a highly dispersible silver powder for preparing solar cell front silver paste and a preparation method thereof. The method comprises: respectively preparing a silver salt solution, an organic ligand solution and a reducing agent solution, wherein the reducing agent solution contains ferrous sulfate; adding an acid solution to the silver salt solution to regulate its pH value to 5-7; The molar ratio of ferrous iron to silver salt is (1~2):1, and the organic ligand solution and the reducing agent solution are simultaneously added dropwise to the silver salt solution. After drying, the highly dispersible silver powder for preparing the front silver paste of the solar cell is obtained. The present invention uses ferrous sulfate as a reducing agent, and in the silver salt reduction process, adds a small amount of organic ligands capable of chelating with ferrous ions, and can effectively regulate the reduction of silver salts by regulating the amount and speed of organic ligands added The obtained ferrous ion chelate can also be coated on the surface of silver powder, thus obtaining highly dispersible silver powder.

Description

technical field [0001] The invention relates to the technical field of silver powder preparation, in particular to a highly dispersible silver powder for preparing a front silver paste of a solar cell and a preparation method thereof. Background technique [0002] Silver powder has become an important part of electronic paste due to its excellent electrical conductivity, and is currently the most widely used and most used precious metal material in the electronics industry. With the development of miniaturization, integration and intelligentization of electronic products, the market has higher and higher performance requirements for silver powder products. The performance of silver powder with different shapes will be very different under the same use environment. Among them, when flake silver powder is used as a filler to conduct electricity, the silver powder is in surface contact with each other, so the point contact resistance of flake silver powder is much lower than t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/102H01L31/0224
CPCB22F9/24H01L31/022425Y02E10/50
Inventor 周勇刘小勇赵庆亮
Owner 山东建邦胶体材料有限公司
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