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Method for preparing micron spherical silver powder

A silver powder, spherical technology, applied in the field of solar cell manufacturing, can solve the problems of wide particle size range, small particle size, uneven particle size, etc., and achieve the effect of good uniformity, high dispersion and smooth surface

Inactive Publication Date: 2012-09-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the silver powder prepared in the prior art is that the particle size range is wide, the particle size is uneven and the particle size is small (the particle size distribution is around 0.8 μm)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the preparation method of present embodiment micron spherical silver powder specifically comprises as follows:

[0023] (1) Prepare 0.3mol / L silver nitrate solution and 0.3mol / L ascorbic acid solution respectively, wherein the ascorbic acid solution contains polyethylene glycol, and the molar ratio of ascorbic acid to polyethylene glycol in the ascorbic acid solution is 1:2.5;

[0024] (2) Adjust the pH of the ascorbic acid solution to 8 with ammonia water with a concentration of 5wt%, first add the dispersant to the ascorbic acid solution, then add the silver nitrate solution dropwise to ascorbic acid and In the mixed solution of dispersant, after ultrasonic dispersion treatment for 10 minutes, stand still, separate, wash with deionized water and absolute ethanol in turn, and then dry at 55°C for 6 hours to obtain a particle size of 1.15-2.13 μm, spherical micron spherical silver powder. The dispersant is a mixture of PEG-6000 and PEG-4000 with a mass ra...

Embodiment 2

[0025] Embodiment 2: the preparation method of present embodiment micron spherical silver powder specifically comprises as follows:

[0026] (1) Use deionized water to prepare 0.4mol / L silver nitrate solution and 0.4mol / L ascorbic acid solution respectively, wherein the ascorbic acid solution contains polyethylene glycol, and the molar ratio of ascorbic acid to polyethylene glycol in the ascorbic acid solution is 1.4 : 3.1;

[0027] (2) Adjust the pH of the ascorbic acid solution to 6 with ammonia water with a concentration of 8wt%, first add the dispersant to the ascorbic acid solution, then add the silver nitrate solution dropwise to ascorbic acid and In the mixed solution of dispersant, after ultrasonic dispersion treatment for 8 minutes, let stand, separate, wash with deionized water and absolute ethanol for 3 times, and then dry at 50°C for 7 hours to obtain a particle size of 1.85-3 μm , Spherical micron-spherical silver powder. The dispersant is a mixture of PEG-6000 ...

Embodiment 3

[0028] Embodiment 3: the preparation method of present embodiment micron spherical silver powder specifically comprises as follows:

[0029] (1) Use deionized water to prepare 0.25mol / L silver nitrate solution and 0.25mol / L ascorbic acid solution, wherein the ascorbic acid solution contains polyethylene glycol, and the molar ratio of ascorbic acid to polyethylene glycol in the ascorbic acid solution is 1.8 : 2.8;

[0030] (2) Adjust the pH of the ascorbic acid solution to 7 with ammonia water with a concentration of 5-10wt%, first add the dispersant to the ascorbic acid solution, and then add the silver nitrate solution dropwise according to the mass ratio of ascorbic acid and silver nitrate to 1.4:1 In the mixed solution of ascorbic acid and dispersant, after ultrasonic dispersion treatment for 12 minutes, stand still, separate, wash twice with deionized water and absolute ethanol in turn, and then dry at 45°C for 8 hours to obtain a particle size of 1.21 ~2.9μm, spherical m...

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Abstract

The invention provides a method for preparing micron spherical silver powder and belongs to the technical field of solar cells. PEG-6000 and PEG-4000 serve as dispersing agents, and the method comprises the following steps of: preparing silver nitrate and ascorbic acid solution with a certain concentration, preparing mixed solution of the dispersing agents and ascorbic acid, regulating the pH value of the reaction solution through ammonia water, dripping a reducing agent and the ascorbic acid into the silver nitrate solution, and performing ultrasonic dispersion treatment, standing, separating, washing and drying after the dripping is ended. The obtained spherical silver powder has smooth surface, high uniformity, high dispersibility and a certain glossiness, the impurity content is less than 3*10 to the power of -4, the specific surface area is 0.2 to 1.2m<2> / g, the tap density is 3.8g / ml, the particle size distribution is 1.15 to 3mu m, and the performance requirement of the solar silver paste can be well met.

Description

technical field [0001] The invention relates to the preparation of silver powder used in solar cell silver paste, in particular to the preparation by a chemical reduction method, and belongs to the technical field of solar cell manufacturing. Background technique [0002] As a kind of green energy, solar energy has attracted more and more attention due to its advantages of inexhaustibility, no pollution, and no limitation of geographical resources. Solar cells are one of the means to develop and utilize solar energy. It is a semiconductor device that uses the photovoltaic effect to directly convert solar energy into electrical energy, and then assembles devices with different voltages, currents, and powers, so that people can obtain new energy. The battery has excellent performance, environmental protection and stability, so it occupies a dominant position in all kinds of solar cells. [0003] Silver powder is the conductive phase of the paste and one of the most critical m...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 甘国友郑娅严继康张子楠王晓新
Owner KUNMING UNIV OF SCI & TECH
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