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Electrode slurry

A technology of electrode paste and conductive powder, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of affecting the service life of cells, not meeting energy conservation and environmental protection, and easily damaging silicon wafers, so as to improve service life and reduce Small warpage, the effect of slowing down the degree of shrinkage

Inactive Publication Date: 2020-08-28
LONGI SOLAR TECH (TAIZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the sintering process, the high electrode sintering temperature is easy to damage the silicon wafer and affect the service life of the battery
At the same time, a higher sintering temperature will lead to higher energy consumption during the sintering process, which does not meet the requirements of energy saving and environmental protection.

Method used

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  • Electrode slurry
  • Electrode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A kind of electrode slurry, its component and weight percentage thereof are: the silver powder of 75 parts, the low melting point alloy powder of 10 parts, the inorganic binding agent of 4.1 parts, the organic vehicle of 10.9 parts. The appearance of silver powder is spherical and hollow spherical, the average particle size is 1.65μm, and the tap density of silver powder is >3.5 g / cm 3 ; The low melting point alloy powder is composed of copper-tin alloy powder and Cu 2 Te, CuTe, Cu 13 Te 7 Composed of copper-tellurium intermetallic compounds, the particle size of the alloy powder is 0.05-0.2 μm; the softening point of the inorganic binder is 350-450 ° C, the average particle size is 2 o 3 , 70 parts of TeO 2 , 3 copies of B 2 o 3 , 4.5 parts of Li 2 O, 6 copies of WO 3 ; The solvent in the organic vehicle is a mixture of alcohol ester dodecyl and butyl carbitol acetate, the thickener is polyvinyl butyral, ethyl cellulose, and the surfactant is alkylphenol polyoxy...

Embodiment 2

[0053] A kind of electrode slurry, its component and percentage by weight thereof are: 70 parts of silver powders, 12 parts of low melting point alloy powders, 4.5 parts of inorganic binders, 13.5 parts of organic vehicles. The shape of the silver powder is spherical or quasi-spherical, the average particle size is 1.25μm, and the tap density of the silver powder is >4.5g / cm 3 ; Low melting point alloy powder is composed of indium tin alloy powder and Cu 2 Composed of Te copper-tellurium intermetallic compound, the particle size of the alloy powder is 0.05-0.5 μm; the softening point of the inorganic binder is 350-450 ° C, the average particle size is 2 o 3 , 66.5 parts of TeO 2 , 4 copies of B 2 o 3 , 2 parts of Li 2 O, 4.5 parts of ZnO, 10 parts of WO 3 ; The organic solvent in the organic carrier is a mixture of terpineol, DBE (mixed dibasic acid ester), the thickener is polyvinyl butyral, and the surfactant is fatty alcohol polyoxyethylene ether, and the rheology addi...

Embodiment 3

[0055] A kind of electrode slurry, its component and weight percent are: 67.5 parts of silver powders, 18 parts of low-melting point alloy powders, 2 parts of inorganic binders, 12.5 parts of organic vehicles. The shape of the silver powder is spherical or quasi-spherical, the average particle size is 1.35μm, and the tap density of the silver powder is >4.5g / cm 3 The low melting point alloy powder is composed of bismuth-tin alloy powder, indium-tin alloy powder and CuTe copper-tellurium intermetallic compound. The particle size of the alloy powder is 0.05-0.2 μm; the softening point of the inorganic binder is 350-450 °C, and the average particle size 2 o 3 , 50 parts of TeO 2 , 10 copies of B 2 o 3 , 5.5 parts of Li 2 O, 4.5 parts of ZnO; the solvent in the organic vehicle is a mixture of butyl carbitol, butyl carbitol acetate and alcohol ester twelve, the thickener is cellulose acetate butyrate, and the surfactant is castor oil Polyoxyethylene ether, the rheology additiv...

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Abstract

The invention discloses electrode slurry, which comprises the following components in parts by weight: 5-15 parts of an organic carrier, 0.5-5 parts of an inorganic binder, and 70-95 parts of conductive powder, wherein the conductive powder comprises the following components in parts by weight: 60-75 parts of silver powder and 10-20 parts of low-melting-point alloy powder. According to the invention, experiments show that the sintering temperature and the silver powder content of the electrode slurry are reduced by adding the low-melting-point alloy powder, wherein the sintering temperature isreduced to 500-650 DEG C from 750-830 DEG C. According to the invention, the low electrode sintering temperature does not damage the silicon wafer, the shrinkage degree of the aluminum slurry is reduced, the warping degree of the solar cell is reduced, and the service life of the solar cell is prolonged; and due to the low sintering temperature, energy consumption in the sintering process is reduced, and the energy-saving and environment-friendly requirements are met.

Description

technical field [0001] The invention relates to the technical field of electronic paste, in particular to an electrode paste. Background technique [0002] The cost reduction of solar cells mainly depends on the improvement of cell efficiency and the reduction of the cost of cell manufacturing materials. The grid wire electrodes on the front surface of solar cells have been prepared by high-temperature sintering after printing silver paste for many years. [0003] At present, the peak sintering temperature of the front silver paste for solar cells is 750-830°C. The high sintering temperature indirectly requires that the back silver paste and the back aluminum paste used in conjunction with it should also be able to adapt to the high sintering temperature process requirements. During the sintering process, the high electrode sintering temperature is easy to damage the silicon chip and affect the service life of the cell. At the same time, a higher sintering temperature will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B1/16H01L31/0224
CPCH01B1/16H01B1/22H01L31/022425Y02E10/50
Inventor 李华
Owner LONGI SOLAR TECH (TAIZHOU) CO LTD
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