Mixed electrode slurry for crystalline silicon solar cells

A technology of solar cells and mixed pastes, which is applied to conductive materials dispersed in non-conductive inorganic materials, circuits, photovoltaic power generation, etc., can solve the problems of reducing battery conversion efficiency, reducing the melting temperature of aluminum powder, and increasing costs. Good economic benefits, improve electrical conductivity, and improve the effect of electrical conductivity

Inactive Publication Date: 2016-06-08

GUANGXI JIKUAN SOLAR ENERGY EQUIP

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AI-Extracted Technical Summary

Problems solved by technology

The use of this slurry can increase the thickness of the alloy layer and improve the ohmic contact. However, in this slurry, the silicon alloy powder and the functional conductive powder (i.e. aluminum powder) are only simply mechanically mixed, and the sintering will not...

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Abstract

The invention belongs to a photocell electrode material and discloses a mixed electrode slurry for crystalline silicon solar cells. The mixed electrode slurry is prepared from, by weight, 40-60 parts of silver powder, 5-10 parts of zinc powder, 10-20 parts of silver coated nickel alloy powder, 1-5 parts of a lithium iron phosphate and carbon nanotube composite material, 1-8 parts of glass powder, 0.5-2 parts of a silane coupling agent, 10-15 parts of butyl carbitol acetate, 1-3 parts of zinc naphthenate, 0.1-0.5 part of hydroxymethyl cellulose and 0.25-1 part of hydrogenated castor oil. The invention further discloses a preparation method of the mixed electrode slurry. The mixed electrode slurry prepared by means of the preparation method does not contain lead, completely meets the requirements of environmental protection, is applied to the production of the solar cells and can form a strong attachment force on the surfaces of the solar cells, and the photoelectric conversion efficiency of the cells is high. In addition, the mixed electrode slurry is simple in process and low in cost and thus has a wide application prospect.

Application Domain

Non-conductive material with dispersed conductive materialPhotovoltaic energy generation +1

Technology Topic

Carbon nanotubeCrystalline silicon +12

Image

Examples

Experimental program(5)
Effect test(1)

Example Embodiment

[0026] Example 1

[0027] First prepare lithium iron phosphate/carbon nanotube composites:

[0028] (1) First ultrasonically disperse 8g carbon nanotubes in a mixed solvent with a volume ratio of 450g ethanol and water of 1:1 to form a carbon nanotube dispersion;

[0029] (2) Add 20g lithium carbonate, 10g ferric nitrate, 8g lithium dihydrogen phosphate and 15g sucrose to the carbon nanotube dispersion respectively, heat and stir to form a slurry, cool to room temperature, ultrasonically disperse for 15min, and place in a vacuum drying box for 15h , then vacuumed and heated to 60°C until the solvent in the slurry was completely volatilized;

[0030] (3) Pre-sintering the composite material treated in step (2) in a muffle furnace at 350° C. for 6 hours, and then calcining at 750° C. for 6 hours to obtain the lithium iron phosphate/carbon nanotube composite material.

[0031] Then formulate glass powder and organic carrier, wherein the component of glass powder I is 5~15μmSiO 2 20g, 5~15μmBi 2 O 3 15g, 5~15μmB 2 O 3 15g, 5~15μmBaO/BaCO 3 8g, 5~15μmγ-AL 2 O 3 20g, 5~15μmZnO8g; the composition of glass powder II is 1~5μmSiO 2 20g, 1~5μmBi 2 O 3 15g, 1~5μmB 2 O 3 15g, 1~5μmBaO/BaCO 3 8g, 1~5μmγ-AL 2 O 3 20g, 1~5μmZnO8g;

[0032]Then prepare the electrode mixed slurry for crystalline silicon solar cells of the present invention, first weigh 50 g of silver powder, 8 g of zinc powder, 15 g of silver-coated nickel alloy powder, 3 g of lithium iron phosphate/carbon nanotube composite material, and the above-prepared glass powder. 7g, KH5501g, butyl carbitol acetate 12g, octyl alkanoate 2g, hydroxymethyl cellulose 0.1g, hydrogenated castor oil 0.25g; the silver powder is nanospheres with a diameter of 50~80nm, and the zinc powder is the active zinc content of More than 98% atomized spherical zinc powder with a diameter of 1~3μm; then the lithium iron phosphate/carbon nanotube composite material, silane coupling agent, octyl alkanoate, hydroxymethyl cellulose and hydrogenated castor oil are dissolved in butyl card In bisphenol acetate, the viscous paste is dissolved in the organic carrier to obtain a viscous paste; then silver powder, zinc powder, silver-coated nickel alloy powder and glass powder are added into the viscous paste, mixed evenly, and then used Grind with a three-roll mill to obtain the electrode mixed slurry.

Example Embodiment

[0033] Example 2

[0034] First prepare lithium iron phosphate/carbon nanotube composites:

[0035] (1) First ultrasonically disperse 5g of carbon nanotubes in a mixed solvent with a volume ratio of 400g of ethanol and water of 1:1 to form a carbon nanotube dispersion;

[0036] (2) Add 25g lithium carbonate, 5g ferric nitrate, 5g lithium dihydrogen phosphate and 10g sucrose to the carbon nanotube dispersion respectively, heat and stir to form a slurry, cool to room temperature, ultrasonically disperse for 10min, and place in a vacuum drying box for 20h , then vacuum and heat to 50°C until the solvent in the slurry evaporates completely;

[0037] (3) Pre-sintering the composite material treated in step (2) in a muffle furnace at 300° C. for 7 hours, and then calcining at 700° C. for 5 hours to obtain the lithium iron phosphate/carbon nanotube composite material.

[0038] Then formulate glass powder and organic carrier, wherein the component of glass powder I is 5~15μmSiO 2 15g, 5~15μmBi 2 O 3 20g, 5~15μmB 2 O 3 10g, 5~15μmBaO/BaCO 3 5g, 5~15μmγ-AL 2 O 3 15g, 5~15μmZnO5g; the composition of glass powder II is 1~5μmSiO 2 10g, 1~5μmBi 2 O 3 20g, 1~5μmB 2 O 3 10g, 1~5μmBaO/BaCO 3 5g, 1~5μmγ-AL 2 O 3 15g, 1~5μmZnO5g;

[0039] Then prepare the electrode mixed slurry for crystalline silicon solar cells of the present invention, first weigh 50 g of silver powder, 8 g of zinc powder, 15 g of silver-coated nickel alloy powder, 3 g of lithium iron phosphate/carbon nanotube composite material, and the above-prepared glass powder. 7g, KH5501g, butyl carbitol acetate 10g, octyl alkanoate 3g, hydroxymethyl cellulose 0.5g, hydrogenated castor oil 0.25g; the silver powder is nanospheres with a diameter of 50~80nm, and the zinc powder is the active zinc content of More than 98% atomized spherical zinc powder with a diameter of 1~3μm; then the lithium iron phosphate/carbon nanotube composite material, silane coupling agent, octyl alkanoate, hydroxymethyl cellulose and hydrogenated castor oil are dissolved in butyl card In bisphenol acetate, the viscous paste is dissolved in the organic carrier to obtain a viscous paste; then silver powder, zinc powder, silver-coated nickel alloy powder and glass powder are added into the viscous paste, mixed evenly, and then used Grind with a three-roll mill to obtain the electrode mixed slurry.

Example Embodiment

[0040] Example 3

[0041] First prepare lithium iron phosphate/carbon nanotube composites:

[0042] (1) First, ultrasonically disperse 10 g of carbon nanotubes in a mixed solvent with a volume ratio of 500 g of ethanol and water of 1:1 to form a carbon nanotube dispersion;

[0043] (2) Add 20g lithium carbonate, 10g ferric nitrate, 10g lithium dihydrogen phosphate and 15g sucrose to the carbon nanotube dispersion respectively, heat and stir to form a slurry, cool to room temperature and ultrasonically disperse for 10min, then transfer to a vacuum drying box for 20h , then vacuum and heat to 50°C until the solvent in the slurry evaporates completely;

[0044] (3) Pre-sintering the composite material treated in step (2) in a muffle furnace at 300° C. for 7 hours, and then calcining at 700° C. for 5 hours to obtain the lithium iron phosphate/carbon nanotube composite material.

[0045] Then formulate glass powder and organic carrier, wherein the component of glass powder I is 5~15μmSiO 2 30g, 5~15μmBi 2 O 3 10g, 5~15μmB 2 O 3 20g, 5~15μmBaO/BaCO 3 10g, 5~15μmγ-AL 2 O 3 25g, 5~15μmZnO10g; the composition of glass powder II is 1~5μmSiO 2 30g, 1~5μmBi 2 O 3 10g, 1~5μmB 2 O 3 20g, 1~5μmBaO/BaCO 3 10g, 1~5μmγ-AL 2 O 3 25g, 1~5μmZnO10g;

[0046] Then prepare the electrode mixed slurry for crystalline silicon solar cells of the present invention, first weigh 50 g of silver powder, 8 g of zinc powder, 15 g of silver-coated nickel alloy powder, 3 g of lithium iron phosphate/carbon nanotube composite material, and the above-prepared glass powder. 7g, KH5501g, butyl carbitol acetate 15g, octyl alkanoate 1g, hydroxymethyl cellulose 0.5g, hydrogenated castor oil 1g; the silver powder is nanospheres with a diameter of 50~80nm, and the zinc powder is an active zinc content of 98 % or more, atomized spherical zinc powder with a diameter of 1~3μm; then the lithium iron phosphate/carbon nanotube composite material, silane coupling agent, octyl alkanoate, hydroxymethyl cellulose and hydrogenated castor oil are dissolved in butyl carbitol In the alcohol acetate, the viscous paste is dissolved in the organic carrier to obtain the viscous paste; then silver powder, zinc powder, silver-coated nickel alloy powder and glass powder are added into the viscous paste, mixed evenly, and then used three times. The electrode mixed slurry was obtained by grinding with a roll mill.

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PUM

Property	Measurement	Unit
Length	3.0 ~ 7.0	µm
Diameter	50.0 ~ 100.0	nm
Diameter	1.0 ~ 3.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Increase contact area
Improve electrical conductivity

Mixed electrode slurry for crystalline silicon solar cells

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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