CN114464369A - Preparation method of solar cell conductive silver paste - Google Patents
Preparation method of solar cell conductive silver paste Download PDFInfo
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- CN114464369A CN114464369A CN202111674687.3A CN202111674687A CN114464369A CN 114464369 A CN114464369 A CN 114464369A CN 202111674687 A CN202111674687 A CN 202111674687A CN 114464369 A CN114464369 A CN 114464369A
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 180
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 142
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 141
- 229910052709 silver Inorganic materials 0.000 claims abstract description 40
- 239000004332 silver Substances 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 38
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 20
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 19
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 19
- 239000011521 glass Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000003960 organic solvent Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 96
- 239000000243 solution Substances 0.000 description 75
- 229910001961 silver nitrate Inorganic materials 0.000 description 48
- 238000003756 stirring Methods 0.000 description 36
- 239000007788 liquid Substances 0.000 description 30
- 239000006185 dispersion Substances 0.000 description 29
- 239000008367 deionised water Substances 0.000 description 24
- 229910021641 deionized water Inorganic materials 0.000 description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- 239000011259 mixed solution Substances 0.000 description 12
- 239000000725 suspension Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 8
- 239000002105 nanoparticle Substances 0.000 description 8
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- 238000006479 redox reaction Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000009210 therapy by ultrasound Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000005036 potential barrier Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0036—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
Abstract
The invention discloses a preparation method of solar cell conductive silver paste, which comprises the following steps: s1, adding 7% of organic carrier, 89.3% of micron reduced graphene oxide silver powder, 2.2% of glass powder and 1.5% of organic solvent into a material barrel, and uniformly mixing to form a mixture; s2, dispersing the mixture; and S3, carrying out gadolinium pressing treatment on the dispersed mixture to obtain the graphene front silver paste. The preparation method of the solar cell conductive silver paste provided by the invention has the excellent performance of each component, plays the role that single silver powder is difficult to play, and enhances the contact and lubricity among silver powder particles and the ohmic contact between silver and a silicon wafer, thereby improving the conversion efficiency of a cell.
Description
Technical Field
The invention relates to the technical field of new energy and solar photovoltaic, in particular to a preparation method of solar cell conductive silver paste.
Background
With the popularization of new energy, low carbon and other concepts, photovoltaic power generation becomes a main force of clean energy. The rapid development of the photovoltaic industry and the demand of silver-containing electronic paste are greatly increased, the front silver paste of the solar cell is composed of silver powder, glass powder and an organic carrier, wherein more than 80 percent of silver powder is used as a main body, and the conductive property is mainly reflected by the silver powder. According to the preparation method of the solar front silver paste in the prior art, the silver powder is prepared from the silver powder consisting of single silver particles, and a large number of gaps are formed among the silver powder particles, so that effective contact among the silver particles can be reduced in a sintering process, and a potential barrier is formed, so that the series resistance of an electrode is increased. Meanwhile, in the silver powder formed by single silver particles adopted in the prior art, the silver particles are easy to gather, so that a certain amount of dispersing agent needs to be added in the process of manufacturing the conductive silver paste, and the addition of the dispersing agent can reduce the conductivity of the silver paste and reduce the electric energy conversion rate of the monocrystalline silicon battery piece.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a preparation method of a solar cell conductive silver paste.
The preparation method of the solar cell conductive silver paste provided by the invention comprises the following steps:
s1, adding 7% of organic carrier, 89.3% of micron reduced graphene oxide silver powder, 2.2% of glass powder and 1.5% of organic solvent into a material barrel, and uniformly mixing to form a mixture;
s2, dispersing the mixture;
and S3, carrying out gadolinium pressing treatment on the dispersed mixture to obtain the graphene front silver paste.
And S2, dispersing the mixture at 2000rpm in a high-speed disperser.
The gadolinium pressing treatment is to place the dispersed mixture into a three-roller machine for gadolinium pressing for 5 times.
The particle size of the micron reduced graphene oxide silver powder is 0.3 to 10 microns; preferably, the particle size of the micron reduced graphene oxide silver powder is 0.8 micron to 2 microns, 1.8 microns, 1.6 microns or 1.7 microns.
According to the preparation method of the solar cell conductive silver paste, the micron reduced graphene oxide silver powder is adopted, the graphene is utilized to provide a three-dimensional conductive network and a high-strength structural support for silver particles, the micron reduced graphene oxide silver powder has excellent performances of all components, the effect that single silver powder is difficult to play is exerted, the contact and the lubricating property among the silver powder particles and the ohmic contact between the silver and a silicon wafer are enhanced, and therefore the conversion efficiency of a cell piece is improved. According to the invention, the graphene oxide is introduced from the source of preparing the silver powder to improve the dispersion uniformity of the graphene in the silver ion solution, and the graphene silver powder composite material is prepared in a liquid phase synchronous reduction mode, so that the process is simple, and the method is suitable for industrial production. The product can be used in photovoltaic cells, the prepared graphene-coated silver powder with different particle sizes is used as a raw material to prepare the graphene-coated silver powder slurry with different particle sizes, and the graphene-coated silver powder slurry is applied to the solar cell front silver slurry, and the electrical performance parameters of the cell are obviously higher than the corresponding cell parameters of Eff photoelectric conversion efficiency when pure silver powder is applied to the solar cell front silver slurry, so that the product has a wide application prospect.
Drawings
Fig. 1 is a schematic view of steps of a method for preparing a solar cell conductive silver paste according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment provides a preparation method of a solar cell conductive silver paste, which comprises the following steps:
s1, adding 7% of organic carrier, 89.3% of mixed silver powder, 2.2% of glass powder and 1.5% of organic solvent into a material barrel by mass percent, and uniformly mixing to form a mixture; wherein the mixed silver powder is formed by mixing pure silver powder and reduced graphene oxide silver powder.
Further, the mass percentage of the graphene silver powder to the mixed silver powder is 20-40%.
Further, the graphene silver powder can be micron reduced graphene oxide silver powder or nanometer reduced graphene oxide silver powder.
S2, dispersing the mixture;
and S3, carrying out gadolinium pressing treatment on the dispersed mixture to obtain the graphene front silver paste.
Further, in step S2, the mixture is subjected to a dispersing treatment, in order to put the mixture into a high-speed disperser, and uniformly dispersed at a rotation speed of 2000 rpm.
Further, the gadolinium pressing treatment is to place the dispersed mixture into a three-roller machine for gadolinium pressing for 5 times. Further, the particle size of the micron reduced graphene oxide silver powder is 2 microns.
Further, the preparation method of the micron reduced graphene oxide silver powder comprises the following steps:
a step for preparing nano reduced graphene oxide silver powder;
the method is used for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder.
Further, the step for preparing the nano reduced graphene oxide silver powder comprises the following steps:
a step for preparing a graphene oxide dispersion liquid;
a step for preparing a PVP dispersion;
a step for preparing a first silver nitrate solution;
a step for preparing a VC solution;
pouring the PVP dispersion liquid into the first silver nitrate solution, and stirring and mixing to obtain a silver nitrate-PVP mixed liquid;
dripping the VC solution into the graphene oxide loaded silver ion mixed solution, stirring and mixing to obtain a graphene oxide loaded nanoparticle suspension;
and heating the graphene oxide loaded nanoparticle turbid liquid to 95 ℃, stirring, and keeping the temperature for 3 hours to obtain the nano reduced graphene oxide silver powder.
Further, the step for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder includes:
preparing the nano reduced graphene oxide silver powder into a nano reduced graphene oxide silver suspension;
a step for preparing a second silver nitrate solution;
a step for preparing a reducing liquid;
pouring the nano reduced graphene oxide silver suspension into the second silver nitrate solution, and performing ultrasonic stirring and mixing to obtain a mixed solution of the nano reduced graphene oxide silver powder and silver nitrate;
the step of transferring the mixed solution of the nano reduced graphene oxide silver powder and the silver nitrate and the reducing solution to reaction equipment together for oxidation-reduction reaction to obtain a seed micron reduced graphene oxide silver solution;
and (3) performing coating treatment, cleaning treatment, drying treatment and mechanical treatment on the micron reduced graphene oxide silver solution to obtain the micron reduced graphene oxide silver powder.
Further, the step for preparing a graphene oxide dispersion liquid includes: dispersing 1445.4g of graphene oxide with the solid content of 1% and the sheet diameter of less than or equal to 2 microns in 14454mL of deionized water, stirring, and performing ultrasonic treatment for 1h to obtain a graphene oxide dispersion liquid;
the step for preparing the PVP dispersion comprises: dissolving 101.2g of PVP in 2891mL of deionized water, and stirring for dissolving to obtain PVP dispersion liquid;
the step for preparing a first silver nitrate solution comprises: dissolving 15.9g of silver nitrate in 2168mL of deionized water, and stirring for dissolving to obtain a first silver nitrate solution;
the step for preparing the VC solution comprises the following steps: dissolving 144.5gVC in 3613.5mL of deionized water, and stirring for dissolving to obtain a VC solution;
the step for preparing a second silver nitrate solution includes: adding 8760g of silver nitrate into 66.24Kg of deionized water, stirring and dissolving to obtain a silver nitrate solution, and heating to 35 ℃;
the step for preparing the reducing solution includes: 472g of F agent, 4670gVC, 472g of A, 445g of C and 300g of nitric acid are added with 68.641Kg of deionized water, stirred and dissolved to obtain a reducing solution, and the temperature is raised to 35 ℃.
Example two
The embodiment provides a preparation method of a solar cell conductive silver paste, which comprises the following steps:
s1, adding 7% of organic carrier, 89.3% of mixed silver powder, 2.2% of glass powder and 1.5% of organic solvent into a material barrel by mass percent, and uniformly mixing to form a mixture; wherein the mixed silver powder is formed by mixing pure silver powder and reduced graphene oxide silver powder.
Further, the mass percentage of the graphene silver powder to the mixed silver powder is 20-40%.
Further, the graphene silver powder can be micron reduced graphene oxide silver powder or nanometer reduced graphene oxide silver powder.
S2, dispersing the mixture;
and S3, carrying out gadolinium pressing treatment on the dispersed mixture to obtain the graphene front silver paste.
Further, in step S2, the mixture is subjected to a dispersing treatment, in order to put the mixture into a high-speed disperser, and uniformly dispersed at a rotation speed of 2000 rpm.
Further, the gadolinium pressing treatment is to place the dispersed mixture into a three-roller machine for gadolinium pressing for 5 times.
Further, the particle size of the micron reduced graphene oxide silver powder is 1.8 microns.
Further, the preparation method of the micron reduced graphene oxide silver powder comprises the following steps:
a step for preparing nano reduced graphene oxide silver powder;
the method is used for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder.
Further, the step for preparing the nano reduced graphene oxide silver powder comprises the following steps:
a step for preparing a graphene oxide dispersion liquid;
a step for preparing a PVP dispersion;
a step for preparing a first silver nitrate solution;
a step for preparing a VC solution;
pouring the PVP dispersion liquid into the first silver nitrate solution, and stirring and mixing to obtain a silver nitrate-PVP mixed liquid;
dripping the VC solution into the graphene oxide loaded silver ion mixed solution, stirring and mixing to obtain a graphene oxide loaded nanoparticle suspension;
and heating the graphene oxide loaded nanoparticle turbid liquid to 95 ℃, stirring, and keeping the temperature for 3 hours to obtain the nano reduced graphene oxide silver powder.
Further, the step for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder includes:
preparing the nano reduced graphene oxide silver powder into a nano reduced graphene oxide silver suspension;
a step for preparing a second silver nitrate solution;
a step for preparing a reducing liquid;
pouring the nano reduced graphene oxide silver suspension into the second silver nitrate solution, and performing ultrasonic stirring and mixing to obtain a mixed solution of the nano reduced graphene oxide silver powder and silver nitrate;
the step of transferring the mixed solution of the nano reduced graphene oxide silver powder and the silver nitrate and the reducing solution to reaction equipment together for oxidation-reduction reaction to obtain a seed micron reduced graphene oxide silver solution;
and (3) performing coating treatment, cleaning treatment, drying treatment and mechanical treatment on the micron reduced graphene oxide silver solution to obtain the micron reduced graphene oxide silver powder.
Further, the step for preparing a graphene oxide dispersion liquid includes: dispersing 722.7g of graphene oxide with the solid content of 1% and the sheet diameter of less than or equal to 2 microns in 7227mL of deionized water, stirring, and performing ultrasonic treatment for 1h to obtain a graphene oxide dispersion liquid;
the step for preparing the PVP dispersion comprises: dissolving 50.6g of PVP in 1445.5mL of deionized water, and stirring for dissolving to obtain PVP dispersion liquid;
the step for preparing a first silver nitrate solution comprises: dissolving 8g of silver nitrate in 1084mL of deionized water, and stirring for dissolving to obtain a first silver nitrate solution;
the step for preparing the VC solution comprises the following steps: dissolving 72.25gVC in 1806.7mL of deionized water, and stirring for dissolving to obtain a VC solution;
the step for preparing a second silver nitrate solution includes: adding 8760g of silver nitrate into 66.24Kg of deionized water, stirring and dissolving to obtain a silver nitrate solution, and heating to 35 ℃;
the step for preparing the reducing solution includes: 472g of F agent, 4670gVC, 472g of A, 445g of C and 300g of nitric acid are added with 68.641Kg of deionized water, stirred and dissolved to obtain a reducing solution, and the temperature is raised to 35 ℃.
EXAMPLE III
The embodiment provides a preparation method of a solar cell conductive silver paste, which comprises the following steps:
s1, adding 7% of organic carrier, 89.3% of mixed silver powder, 2.2% of glass powder and 1.5% of organic solvent into a material barrel by mass percent, and uniformly mixing to form a mixture; wherein the mixed silver powder is formed by mixing pure silver powder and reduced graphene oxide silver powder.
Further, the mass percentage of the graphene silver powder to the mixed silver powder is 20-40%.
Further, the graphene silver powder can be micron reduced graphene oxide silver powder or nanometer reduced graphene oxide silver powder.
S2, dispersing the mixture;
and S3, carrying out gadolinium pressing treatment on the dispersed mixture to obtain the graphene front silver paste.
Further, in step S2, the mixture is subjected to a dispersing treatment, in order to put the mixture into a high-speed disperser, and uniformly dispersed at a rotation speed of 2000 rpm.
Further, the gadolinium pressing treatment is to place the dispersed mixture into a three-roller machine for gadolinium pressing for 5 times.
Further, the particle size of the micron reduced graphene oxide silver powder is 1.6 microns.
Further, the preparation method of the micron reduced graphene oxide silver powder comprises the following steps:
a step for preparing nano reduced graphene oxide silver powder;
the method is used for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder.
Further, the step for preparing the nano reduced graphene oxide silver powder comprises the following steps:
a step for preparing a graphene oxide dispersion liquid;
a step for preparing a PVP dispersion;
a step for preparing a first silver nitrate solution;
a step for preparing a VC solution;
pouring the PVP dispersion liquid into the first silver nitrate solution, and stirring and mixing to obtain a silver nitrate-PVP mixed liquid;
dripping the VC solution into the graphene oxide loaded silver ion mixed solution, stirring and mixing to obtain a graphene oxide loaded nanoparticle suspension;
and heating the graphene oxide loaded nanoparticle turbid liquid to 95 ℃, stirring, and keeping the temperature for 3 hours to obtain the nano reduced graphene oxide silver powder.
Further, the step for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder includes:
preparing the nano reduced graphene oxide silver powder into a nano reduced graphene oxide silver suspension;
a step for preparing a second silver nitrate solution;
a step for preparing a reducing liquid;
pouring the nano reduced graphene oxide silver suspension into the second silver nitrate solution, and performing ultrasonic stirring and mixing to obtain a mixed solution of the nano reduced graphene oxide silver powder and silver nitrate;
the step of transferring the mixed solution of the nano reduced graphene oxide silver powder and the silver nitrate and the reducing solution to reaction equipment together for oxidation-reduction reaction to obtain a seed micron reduced graphene oxide silver solution;
and (3) performing coating treatment, cleaning treatment, drying treatment and mechanical treatment on the micron reduced graphene oxide silver solution to obtain the micron reduced graphene oxide silver powder.
The step for preparing the graphene oxide dispersion liquid includes: dispersing 722.7g of graphene oxide with the solid content of 1% and the sheet diameter of less than or equal to 2 microns in 7227mL of deionized water, stirring, and performing ultrasonic treatment for 1h to obtain a graphene oxide dispersion liquid;
the step for preparing the PVP dispersion comprises: dissolving 50.6g of PVP in 1445.5mL of deionized water, and stirring for dissolving to obtain PVP dispersion;
the step for preparing a first silver nitrate solution comprises: dissolving 8g of silver nitrate in 1084mL of deionized water, and stirring for dissolving to obtain a first silver nitrate solution;
the step for preparing the VC solution comprises the following steps: dissolving 72.25gVC in 1806.7mL of deionized water, and stirring for dissolving to obtain a VC solution;
the step for preparing a second silver nitrate solution includes: adding 8760g of silver nitrate into 66.24Kg of deionized water, stirring and dissolving to obtain a second silver nitrate solution, and heating to 40 ℃;
the step for preparing the reducing solution includes: 472g of F agent, 4670gVC, 472g of A, 445g of C and 300g of nitric acid are added with 68.641Kg of deionized water, stirred and dissolved to obtain a reducing solution, and the temperature is raised to 40 ℃.
Example four
The embodiment provides a preparation method of a solar cell conductive silver paste, which comprises the following steps:
s1, adding 7% of organic carrier, 89.3% of mixed silver powder, 2.2% of glass powder and 1.5% of organic solvent into a material barrel by mass percent, and uniformly mixing to form a mixture; wherein the mixed silver powder is formed by mixing pure silver powder and reduced graphene oxide silver powder.
Further, the mass percentage of the graphene silver powder to the mixed silver powder is 20-40%.
Further, the graphene silver powder can be micron reduced graphene oxide silver powder or nanometer reduced graphene oxide silver powder. S2, dispersing the mixture;
and S3, carrying out gadolinium pressing treatment on the dispersed mixture to obtain the graphene front silver paste.
Further, in step S2, the mixture is subjected to a dispersing treatment, in order to put the mixture into a high-speed disperser, and uniformly dispersed at a rotation speed of 2000 rpm.
Further, the gadolinium pressing treatment is to place the dispersed mixture into a three-roller machine for gadolinium pressing for 5 times.
Further, the particle size of the micron reduced graphene oxide silver powder is 1.7 microns.
Further, the preparation method of the micron reduced graphene oxide silver powder comprises the following steps:
a step for preparing nano reduced graphene oxide silver powder;
the method is used for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder.
Further, the step for preparing the nano reduced graphene oxide silver powder comprises the following steps:
a step for preparing a graphene oxide dispersion liquid;
a step for preparing a PVP dispersion;
a step for preparing a first silver nitrate solution;
a step for preparing a VC solution;
pouring the PVP dispersion liquid into the first silver nitrate solution, and stirring and mixing to obtain a silver nitrate-PVP mixed liquid;
dripping the VC solution into the graphene oxide loaded silver ion mixed solution, stirring and mixing to obtain a graphene oxide loaded nanoparticle suspension;
and heating the graphene oxide loaded nanoparticle turbid liquid to 95 ℃, stirring, and keeping the temperature for 3 hours to obtain the nano reduced graphene oxide silver powder.
Further, the step for preparing the micron reduced graphene oxide silver powder by using the nano reduced graphene oxide silver powder includes:
preparing the nano reduced graphene oxide silver powder into a nano reduced graphene oxide silver suspension;
a step for preparing a second silver nitrate solution;
a step for preparing a reducing solution;
pouring the nano reduced graphene oxide silver suspension into the second silver nitrate solution, and performing ultrasonic stirring and mixing to obtain a mixed solution of the nano reduced graphene oxide silver powder and silver nitrate;
the step of transferring the mixed solution of the nano reduced graphene oxide silver powder and the silver nitrate and the reducing solution to reaction equipment together for oxidation-reduction reaction to obtain a seed micron reduced graphene oxide silver solution;
and (3) performing coating treatment, cleaning treatment, drying treatment and mechanical treatment on the micron reduced graphene oxide silver solution to obtain the micron reduced graphene oxide silver powder.
The step for preparing the graphene oxide dispersion liquid includes: dispersing 722.7g of graphene oxide with the solid content of 1% and the sheet diameter of less than or equal to 2 microns in 7227mL of deionized water, stirring, and performing ultrasonic treatment for 1h to obtain a graphene oxide dispersion liquid;
the step for preparing the PVP dispersion comprises: dissolving 50.6g of PVP in 1445.5mL of deionized water, and stirring for dissolving to obtain PVP dispersion liquid;
the step for preparing a first silver nitrate solution comprises: dissolving 8g of silver nitrate in 1084mL of deionized water, and stirring for dissolving to obtain a first silver nitrate solution;
the step for preparing the VC solution comprises the following steps: dissolving 72.25gVC in 1806.7mL of deionized water, and stirring for dissolving to obtain a VC solution;
the step for preparing a second silver nitrate solution includes: adding 8760g of silver nitrate into 66.24Kg of deionized water, stirring and dissolving to obtain a silver nitrate solution, and heating to 35 ℃;
the step for preparing the reducing solution includes: 472g of F agent, 4670gVC, 472g of A, 445g of C and 300g of nitric acid are added with 68.641Kg of deionized water, stirred and dissolved to obtain a reducing solution, and the temperature is raised to 35 ℃.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The preparation method of the solar cell conductive silver paste is characterized by comprising the following steps:
s1, adding 7% of organic carrier, 89.3% of mixed silver powder, 2.2% of glass powder and 1.5% of organic solvent into a material barrel by mass percent, and uniformly mixing to form a mixture; wherein the mixed silver powder is formed by mixing pure silver powder and reduced graphene oxide silver powder;
s2, dispersing the mixture;
and S3, carrying out gadolinium pressing treatment on the dispersed mixture to obtain the graphene front silver paste.
2. The method for preparing the conductive silver paste for the solar cell according to claim 1, wherein the step S2 is to disperse the mixture uniformly at a rotation speed of 2000rpm by placing the mixture into a high-speed disperser.
3. The method for preparing the conductive silver paste for the solar cell according to claim 2, wherein the gadolinium pressing treatment is to place the dispersed mixture into a three-roll machine for gadolinium pressing for 5 times.
4. The method for preparing the conductive silver paste for the solar cell according to claim 3, wherein the particle size of the reduced graphene oxide silver powder is 2 microns.
5. The method for preparing the conductive silver paste for the solar cell according to claim 3, wherein the particle size of the reduced graphene oxide silver powder is 1.8 microns.
6. The method for preparing the conductive silver paste for the solar cell according to claim 3, wherein the particle size of the reduced graphene oxide silver powder is 1.6 microns.
7. The method for preparing the conductive silver paste for the solar cell according to claim 3, wherein the particle size of the reduced graphene oxide silver powder is 1.7 micrometers.
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