CN103177791A - Aluminum electrically conductive slurry used for solar cell and preparation method thereof - Google Patents
Aluminum electrically conductive slurry used for solar cell and preparation method thereof Download PDFInfo
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- CN103177791A CN103177791A CN2011104377836A CN201110437783A CN103177791A CN 103177791 A CN103177791 A CN 103177791A CN 2011104377836 A CN2011104377836 A CN 2011104377836A CN 201110437783 A CN201110437783 A CN 201110437783A CN 103177791 A CN103177791 A CN 103177791A
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Abstract
The invention provides aluminum electrically conductive slurry used for a solar cell and a preparation method thereof. The aluminum electrically conductive slurry used for the solar cell comprises the following components: aluminum powder, glass powder, an organic carrier and an inorganic additive powder, wherein the inorganic additive powder with the intermediate grain size D50 of 0.1-5.0 microns is one or more selected from beta-eucryptite, zirconium tungstate or zirconium vanadate. After the aluminum electrically conductive slurry used for the solar cell is silk-screen printed to a crystal silicon solar cell and is sintered into a film, the metal film is attached to a silicon substrate firmly. The aluminum electrically conductive slurry used for the solar cell has a smooth and compact surface, is free from aluminum beads and aluminum blistersm and has high photoelectric conversion efficiency; the warping degree of the cell is small; and the average warping degree of the 156*156 type polycrystalline silicon solar cell is less than 0.50 mm.
Description
Technical field
The invention belongs to technical field of solar batteries, be specifically related to a kind of used for solar batteries aluminum conductive electric slurry and preparation method thereof.
Background technology
Solar cell is a kind of inexhaustible environmental protection regenerative resource, and current international research is very active.Aluminum conductive electric slurry belongs to one of electronic information material, is also simultaneously the main auxiliary material of making solar cell.In present crystal silicon solar batteries manufacture craft, aluminum conductive electric slurry almost is printed on the whole shady face of battery, and (coefficient of expansion is 232 * 10 due to metallic aluminium
-7/ ℃, 20-300 ℃) (coefficient of expansion is 26 * 10 with silicon
-7/ ℃, 20-300 ℃) the difference of thermal coefficient of expansion, cause aluminum conductive electric slurry when sintering, produce stress in silicon chip, cause silicon chip crooked.
In order further to reduce the manufacturing cost of crystal-silicon solar cell, strengthen the competitiveness that it generates electricity with traditional energy, the thickness of silicon chip from before 210 μ m be reduced to gradually 180 present μ m, and downward trend still.Along with the continuous attenuate of silicon wafer thickness, after traditional aluminium paste sintering, the easier warpage of cell piece directly affects the rate of finished products of solar cell and follow-up component process.In prior art, reducing silicon warp has many methods, the transfer amount such as can reduce the aluminium paste printing time, reduces sintering temperature or makes matrix produce plastic deformation etc. by special cooling technology.
CN101728439A discloses a kind of composition and preparation method of silicon solar cell aluminum back-surface-field conductive paste, the metal of the 2-6 μ m by adding 0.5-6.0wt% in the method or flexibility and the electrical property that non-metal powder additive (one or more in boron, silicon, zinc, antimony, tin) improves the battery that forms after prepared aluminium paste sintering.But in such additive, the fusing point of non-metal powder boron and silicon is very high, the fusing point that surpasses aluminium far away, it only mixes by simple and mechanical with aluminium, therefore can not form uniform alloy with base metal aluminium under the sintering process of at present general crystal silicon cell, therefore the flexibility of cell piece can not be improved, even the photoelectric conversion efficiency of battery may be reduced because introducing impurity.And metal dust zinc, antimony, tin in such additive, even form alloy with aluminium powder after sintering, but the coefficient of expansion of the coefficient of expansion of the alloy of its formation and cell piece silicon substrate differs larger, therefore adds metal powder also unhelpful to the flexibility of improving cell piece.Therefore, adopt disclosed aluminum conductive electric slurry in present prior art still to be difficult to satisfy the low warpage requirement of cell piece.
Summary of the invention
Cause silicon chip bending, photoelectric conversion efficiency can not satisfy the problem that battery further develops after the invention solves the solar cell aluminum conductive electric slurry sintering that exists in prior art.
The invention provides a kind of used for solar batteries aluminum conductive electric slurry, the component of described used for solar batteries aluminum conductive electric slurry comprises aluminium powder, glass dust, organic carrier and inorganic additive powder; The middle particle diameter D of described inorganic additive powder
50Be 0.1-5.0 μ m, and be selected from beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium one or more.
The present invention also provides the preparation method of described used for solar batteries aluminum conductive electric slurry, comprises glass dust and inorganic additive powder are scattered in organic carrier, then adds aluminium powder in batches, obtains described used for solar batteries aluminum conductive electric slurry after grinding; The middle particle diameter D of described inorganic additive powder
50Be 0.1-5.0 μ m, and be selected from beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium one or more.
Used for solar batteries aluminum conductive electric slurry provided by the invention by formula of size is improved, reduces aluminium film and silicon substrate layer stress and produces root.In the present invention, concrete by particle diameter D in adopting
50For 0.1-5.0 μ m and be selected from one or more inorganic additive powder of beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium, thereby the thermal coefficient of expansion of residual mixture after the slurry sintering, dwindle the difference of the thermal coefficient of expansion between sintering residue and silicon materials, and then improve the warpage issues after the cell piece sintering; This aluminum conductive electric slurry is printed to the silicon substrate after the sintering film forming, and the cell piece angularity is little, the smooth densification of aluminium film, and without aluminium pill aluminium blister, photoelectric conversion efficiency is high.Relatively can find out from the result of embodiment 1-4 and Comparative Examples 1-4, print the crystalline silicon solar cell piece of used for solar batteries aluminum conductive electric slurry provided by the invention, the aluminium film that obtains after sintering and silicon substrate adhesion-tight, smooth surface, do not play aluminium pill and aluminium blister, the cell piece angularity is very little, and the average angularity of the polycrystalline silicon solar cell sheet of 156 * 156 types is less than 0.5mm.
Embodiment
The invention provides a kind of used for solar batteries aluminum conductive electric slurry, the component of described used for solar batteries aluminum conductive electric slurry comprises aluminium powder, glass dust, organic carrier and inorganic additive powder; The middle particle diameter D of described inorganic additive powder
50Be 0.1-5.0 μ m, and be selected from beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium one or more.
Because the present back field aluminum paste of industry universal is generally formed by aluminium powder, glass dust, organic carrier agitation grinding, after the aluminium paste printing-sintering, what stay silicon chip back side is aluminium powder and a small amount of glass dust that plays bonding effect.(coefficient of expansion is 232 * 10 due to metallic aluminium
-7/ ℃, 20-300 ℃) (coefficient of expansion is 26 * 10 with silicon
-7/ ℃, 20-300 ℃) difference of thermal expansion coefficients of material is larger, after causing back surface field aluminium film cooling, produces stress in silicon chip, causes the bending of silicon chip.
The present inventor finds by great many of experiments, passes through in the present invention to add a certain amount of inorganic particle in aluminum conductive electric slurry, and such inorganic powder material has larger negative expansion coefficient, and has isotropism, the response temperature wide ranges; After aluminium powder in such negative expansion inorganic powder material and slurry, glass dust and organic carrier mixed grinding, namely obtain used for solar batteries aluminum conductive electric slurry of the present invention, by adopting used for solar batteries aluminum conductive electric slurry of the present invention, the thermal coefficient of expansion of the residue after the slurry sintering is compared metallic aluminium and is greatly reduced, the difference of therefore having dwindled the coefficient of thermal expansion of slurry sintering residue and silicon materials, so improved largely warpage issues after the cell piece sintering.
In the present invention, described inorganic additive powder is selected from beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium.Wherein, the mean thermal expansion coefficients of beta-eucryptite in 0-1000 ℃ is-6.4 * 10
-6/ ℃.The wolframic acid zirconium has isotropic negative expansion effect between 0.3-777 ℃, its negative expansion coefficient reaches as high as-8.7 * 10
-6/ ℃, and the temperature range of its negative expansion coefficient is also wider.
Therefore, described beta-eucryptite, wolframic acid zirconium and vanadic acid zirconium have larger negative expansion coefficient in the sintering range commonly used of aluminium paste in the prior art.Therefore, by adopting beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium as the inorganic additive powder in slurry, can greatly reduce the thermal coefficient of expansion of slurry, thereby improve the warpage issues after the cell piece sintering in the present invention.
Simultaneously, in the present invention, in described used for solar batteries aluminum conductive electric slurry, the middle particle diameter D of the inorganic additive powder that adopts
50Be 0.1-5.0 μ m.The median particle diameter of described inorganic additive can not be too large, otherwise can not well be filled between aluminium powder and glass dust, affects aluminium Film conductivity energy after sintering, affects battery efficiency.In addition, the median particle diameter of described inorganic additive can not be too little, otherwise processing difficulties and material cost raise.Under preferable case, the middle particle diameter D of described inorganic additive
50Be 0.5-3.0 μ m.
In inorganic additive powder of the present invention, in the slurry high-temperature sintering process, beta-eucryptite (Li
2OAl
2O
32SiO
2) can regard the composition of lithia, aluminium oxide and silica, wolframic acid zirconium (ZrO as
2WO
3) can regard the composition of tungstic acid and zirconium dioxide as, and vanadic acid zirconium (ZrO
2V
2O
5) can regard the composition of vanadic oxide and zirconium dioxide as.Under the sintering process of crystal-silicon solar cell, glass dust in described inorganic additive powder and slurry fuses mutually, thereby become the part of slurry binding agent, the adhesive force of aluminium film to silicon substrate after the increase sintering, simultaneously also can reduce the addition of the glass dust in slurry, thereby guarantee the content of slurry system aluminium powder, cause the reduction of the photoelectric conversion efficiency of cell piece with the minimizing of avoiding conducting objects.
Under preferable case, in the present invention, described inorganic additive powder is beta-eucryptite.Because beta-eucryptite wolframic acid zirconium, vanadic acid zirconium more easily obtain, and can stand variations in temperature sharply, any change does not occur in performance.In addition, beta-eucryptite phase wolframic acid zirconium, vanadic acid zirconium have larger average negative expansion coefficient in the relevant temperature zone.In the present invention, described inorganic additive powder can prepare by own, also can directly adopt the commercially available prod, for example can adopt the Tianjin flood to rise the eucryptite powder of the negative thermal expansion coefficient series of electronic ceramic Co., Ltd.
In the present invention, in described used for solar batteries aluminum conductive electric slurry, the content of aluminium powder, glass dust and inorganic carrier all gets final product in those skilled in the art's usual range, and the present invention does not have particular provisions.For example, take the total weight of described used for solar batteries aluminum conductive electric slurry as benchmark, the content of aluminium powder is 60-85wt%, and the content of glass dust is 0.2-8.0wt%, and the content of organic carrier is 15-30wt%.
Take the total weight of described used for solar batteries aluminum conductive electric slurry as benchmark, in the present invention, the content of described inorganic additive powder is 0.5-5.0wt%.Although the relative aluminium powder of the consumption of described inorganic additive is smaller, according to the additive property of thermal coefficient of expansion, the residual mixture that obtains after the slurry sintering still has positive thermal expansion character, and its coefficient of expansion is compared metallic aluminium and greatly reduced.Simultaneously, the present inventor found through experiments, and in slurry, the inorganic additive powder content is too much, may affect aluminium Film conductivity energy after sintering, and the very few effect that reduces the cell piece angularity that do not have.
In the present invention, described aluminium powder is various aluminium powders commonly used in existing aluminum conductive electric slurry.For example, described aluminium powder is that the active aluminium content that obtains of nitrogen atomization method is in the ball aluminum powder more than 98.5%.Under preferable case, the middle particle diameter D of described aluminium powder
50Be 2.0-8.0 μ m.In the present invention, described aluminium powder can directly adopt and be purchased product, and the median particle diameter D50 that for example can adopt ocean, Henan company to produce is that 2.0 ~ 8.0 spherical aluminium powders of μ m or Hunan limited company of Hengchang produce D
50Spherical aluminium powder less than 8.0 μ m.
In the present invention, described glass dust can adopt various lead-free glass powders commonly used in prior art, for example can adopt Bi
2O
3-B
2O
3-SiO
2Glass frit.Described Bi
2O
3-B
2O
3-SiO
2Consisting of of glass frit: bismuth oxide (Bi
2O
3) account for 30-70wt%, diboron trioxide (B
2O
3) account for 5-30wt%, silicon dioxide (SiO
2) accounting for 2-15wt%, calcium oxide (CaO) accounts for 1.0-5.0wt%, and magnesium oxide (MgO) accounts for 0.2-8.0wt%, aluminium oxide (Al
2O
3) accounting for 0-5.0wt%, barium monoxide (BaO) accounts for 0-3.0wt%.Described Bi
2O
3-B
2O
3-SiO
2Glass frit can directly adopt and be purchased product, also can oneself synthesize, and synthetic method is: above all kinds of oxide powders are mixed in proportion, and melting, shrend, filtration, oven dry are ground to required particle diameter and namely obtain described Bi
2O
3-B
2O
3-SiO
2Glass frit.Under preferable case, in the present invention, the middle particle diameter D of described glass dust
50Be the 0.2-3.0 micron.The beginning fusing point of described glass dust is 580-620 ℃.
The middle particle diameter D of above-mentioned inorganic additive powder, aluminium powder, glass dust
50All can test by method and the instrument of particle diameter in existing test, for example can adopt BT-9300 type laser particle size analyzer to test.
Organic carrier of the present invention is the mixed system that contains ethyl cellulose, auxiliary agent and solvent commonly used in prior art.Take the gross mass of described organic carrier as benchmark, wherein the content of ethyl cellulose is 3.0-15wt%, and the content of auxiliary agent is 0.5-5.0wt%, and the content of solvent is 70-95wt%.Wherein, described solvent can adopt the combination of multi-solvents commonly used in prior art, is mixed solvent.For example, described mixed solvent can be selected from two or more in terpinol, dibutyl phthalate (DBP), butyl carbitol, turpentine oil, butyl glycol ether, butyl carbitol acetate, ethylene glycol ether acetate, tributyl citrate, butyl carbitol acetate, dibutyl phthalate, tributyl phosphate.Described auxiliary agent is selected from one or more in hexadecanol, 18 alcohol, polyamide wax powder, rilanit special.
The present invention also provides the preparation method of described used for solar batteries aluminum conductive electric slurry, comprises glass dust and inorganic additive powder are scattered in organic carrier, then adds aluminium powder in batches, obtains described used for solar batteries aluminum conductive electric slurry after grinding; The middle particle diameter D of described inorganic additive powder
50Be 0.1-5.0 μ m, and be selected from beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium one or more.
Particularly, the compound method of described inorganic carrier is: ethyl cellulose and auxiliary agent dissolving are added in mixed solvent, make ethyl cellulose, auxiliary agent fully dissolve and stir under 20-70 ℃, namely obtain transparent organic carrier.
In the present invention, for guaranteeing aluminium powder and glass dust, inorganic additive powder Uniform Dispersion, described aluminium powder is for add in batches.Under preferable case, the number of times in batches of aluminium powder is 2-3 time, stirs after adding at every turn, then adds next batch; After all adding, high-speed stirred is even.Described grinding can adopt three-roll grinder to carry out, and grinding number of times is 10-15 time, is ground to the slurry fineness to＜20 μ m, namely obtains conductive paste for solar cell provided by the invention.
The present invention is further illustrated below by embodiment.In embodiment and Comparative Examples, the raw material that adopts all is commercially available.
Embodiment 1
The present embodiment is used for illustrating solar cell conductive paste disclosed by the invention and preparation method thereof.
(1) preparation of glass dust
Get the bismuth oxide (Bi of 55wt%
2O
3), the diboron trioxide (B of 25wt%
2O
3), 15wt% silicon dioxide (SiO
2), the calcium oxide of 3.5wt% (CaO), the magnesium oxide of 1.5wt% (MgO) adopts V-Mixer that each component is mixed, in the porcelain crucible of packing into, put into silicon carbide rod furnace, intensification is preheating to 550 ℃, insulation 0.5h, then rise to 1250 ℃, melting 0.5h, shrend is filtered, and with the bead that the obtains ball grinder of packing into, controls quality than zirconia ball: bead: deionized water=4:1:0.6,250 rev/mins of rotating speeds, ball milling 7h filters post-drying, then the 0.5h that dry grinds, during dry grinding, the mass ratio of zirconia ball and glass dust is 1:2, obtains middle particle diameter D
50Be the glass dust of 1.5 μ m, standby.
(2) preparation of organic carrier
According to quality than butyl carbitol: terpinol: butyl carbitol acetate: dibutyl phthalate (DBP)=75:10:10:5, each organic solvent is mixed, obtain mixed solvent.Get the mixed solvent of 90 weight portions, add 7.5 weight portion ethyl cellulose STD-4(Tao Shi to produce, viscosity is 4), 2 weight portion rilanit specials, 0.5 weight portion hexadecanol is heated to 70 ℃ and makes abundant dissolving, stirs to obtain the organic carrier of homogeneous clarification.
(3) preparation of aluminum conductive electric slurry
Get the organic carrier that is made by step (2) of 22 weight portions, be placed in the stainless cylinder of steel of high speed dispersor, (the Tianjin flood is risen electronic ceramic Co., Ltd, middle particle diameter D to add glass dust that 1.5 weight portion steps (1) make and 2.5 weight portion beta-eucryptite powder under stirring
50Be 1.5 μ m), stir.Divide again 2 batches to add 74 weight portion ball aluminum powder (the ultrapure aluminium powder that ocean, Henan company produces, middle particle diameter D
50Be 4.5 μ m), every batch of aluminium powder adds and first stirs afterwards, then adds next batch; After all adding, high-speed stirred is even; Grind 15 times with 150 three-roll grinder at last, be ground to slurry fineness＜20 μ m, obtain the used for solar batteries aluminum conductive electric slurry of the present embodiment, be designated as S1.
Embodiment 2
Adopt the step identical with embodiment 1 to prepare the used for solar batteries aluminum conductive electric slurry S2 of the present embodiment, difference is: in step (3), the consumption of beta-eucryptite powder changes 5 weight portions into by 2.5 weight portions, the consumption of glass dust changes 0.5 weight portion into by 1.5 weight portions, and the consumption of aluminium powder changes 72.5 weight portions into by 74 weight portions.
Embodiment 3
Adopt the step identical with embodiment 1 to prepare the used for solar batteries aluminum conductive electric slurry S2 of the present embodiment, difference is: in step (3), and the middle particle diameter D of beta-eucryptite powder
50Make 5.0 μ m into by 1.5 μ m.
Embodiment 4
Adopt the step identical with embodiment 1 to prepare the used for solar batteries aluminum conductive electric slurry S2 of the present embodiment, difference is: in step (3), adopt the beta-eucryptite powder in wolframic acid zirconium alternate embodiment 1.
Comparative Examples 1
Adopt the step identical with embodiment 1 to prepare the used for solar batteries aluminum conductive electric slurry DS1 of this Comparative Examples, difference is: in step (3), do not add the beta-eucryptite powder, the consumption of glass dust changes 4 weight portions into by 1.5 weight portions simultaneously.
Comparative Examples 2
Adopt the step identical with embodiment 1 to prepare the used for solar batteries aluminum conductive electric slurry DS2 of this Comparative Examples, difference is: in step (3), do not add the beta-eucryptite powder, the consumption of glass powder changes 2.5 weight portions into by 1.5 weight portions simultaneously, and the consumption of aluminium powder changes 75.5 weight portions into by 74 weight portions.
Comparative Examples 3
Adopt the step identical with embodiment 1 to prepare the used for solar batteries aluminum conductive electric slurry DS3 of this Comparative Examples, difference is: in step (3), and the middle particle diameter D of beta-eucryptite powder
50Make 6.0 μ m into by 1.5 μ m.
Comparative Examples 4
The method of employing CN101728439A prepares the solar cell aluminum conductive electric slurry DS4 of this Comparative Examples, and concrete steps are identical with embodiment 1, and difference is: in step (3), adopt the middle particle diameter D of 2.5 weight portions
50Be that the boron powder of 3.5 microns replaces 2.5 weight portion beta-eucryptite powder in embodiment 1.
Performance test
Above-mentioned used for solar batteries aluminum conductive electric slurry S1-S4 and DS1-DS4 is on probation at production line respectively.Before polysilicon chip specification: 156156mm, thickness are 200 μ m(corrosion), before printing, thickness is 180 μ m.first adopt 200 purpose silk screen printing back silver electrode slurrys (PV505 of Du Pont), oven dry, adopt again 280 purpose meshcount printing solar cells aluminum conductive electric slurry S1-S4 and DS1-DS4, the printing weight be every with the slurry 1.5 grams, bake out temperature is 125 ℃, drying time is 4min, adopt again 200 purpose silk screen printing front silver electrode pastes (16C of Du Pont), cross continuous tunnel furnace oven dry sintering, the continuous tunnel furnace temperature gradient distribution, the time that crosses continuous tunnel furnace is 2min, the sintering peak temperature is 89010 ℃, time is 2s, the come out of the stove properties of rear test each cell piece S10-S40 and DS10-DS40.
(1) surface appearance: range estimation back surface field surface appearance, smooth, without aluminium pill or aluminium blister, be designated as OK, otherwise be NG.
(2) adhesive force: soaked each cell piece 7 days with running water under room temperature, the back surface field metal film does not come off or gently scrapes with blunt and do not come off, and is designated as OK, otherwise is NG.
(3) angularity: with the degree of crook vernier caliper measurement of cell piece, unit is mm.Repeat 100 times, record the mean value of angularity.
(4) electricity conversion: adopt the single flash operation simulator according to the disclosed method of IEC904-1, each cell piece to be tested.Test condition is standard test condition (STC): light intensity: 1000W/m
2Spectrum: AM1.5; Temperature: 25 ℃.Repeat 100 times, record the mean value of electricity conversion.
Test result as shown in Table 1 and Table 2.
Table 1
| Test item | S10 | S20 | S30 | S40 |
| Surface appearance | OK | OK | OK | OK |
| Adhesive force | OK | OK | OK | OK |
| Angularity (mm) | 0.10-0.30 | 0.30-0.50 | 0.30-0.50 | 0.20-0.40 |
| Electricity conversion | 17. 40% | 17.23% | 17.25% | 17.31% |
Table 2
| Test item | DS10 | DS20 | DS30 | DS40 |
| Surface appearance | OK | OK | OK | OK |
| Adhesive force | OK | OK | NG | NG |
| Angularity (mm) | 0.80-1.10 | 1.20-1.50 | 0.40-0.60 | 0.80-1.00 |
| Electricity conversion | 17.18% | 17.22% | 17.23% | 17.12% |
Relatively can find out from upper table 1 and the result of table 2, adopt used for solar batteries aluminum conductive electric slurry provided by the invention to be screen-printed on crystal-silicon solar cell and the sintering film forming after, obtain the smooth densification of aluminium film, without aluminium pill, aluminium blister, photoelectric conversion efficiency is high, the cell piece angularity is little, and the average angularity of 156 * 156 type polycrystalline silicon solar cell sheets is less than 0.50mm.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a used for solar batteries aluminum conductive electric slurry, is characterized in that, the component of described used for solar batteries aluminum conductive electric slurry comprises aluminium powder, glass dust, organic carrier and inorganic additive powder; The middle particle diameter D of described inorganic additive powder
50Be 0.1-5.0 μ m, and be selected from beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium one or more.
2. used for solar batteries aluminum conductive electric slurry according to claim 1, is characterized in that, described inorganic additive powder is beta-eucryptite.
3. used for solar batteries aluminum conductive electric slurry according to claim 1, is characterized in that, the middle particle diameter D of described inorganic additive powder
50Be 0.5-3.0 μ m.
4. the described used for solar batteries aluminum conductive electric slurry of any one according to claim 1-3, it is characterized in that, take the total weight of described used for solar batteries aluminum conductive electric slurry as benchmark, the content of aluminium powder is 60-85wt%, the content of glass dust is 0.2-8.0wt%, the content of organic carrier is 15-30wt%, and the content of inorganic additive powder is 0.5-5.0wt%.
5. used for solar batteries aluminum conductive electric slurry according to claim 1, is characterized in that, described aluminium powder is that active aluminium content is in the atomizing ball aluminum powder more than 98.5%.
6. used for solar batteries aluminum conductive electric slurry according to claim 1, is characterized in that, described glass dust is Bi
2O
3-B
2O
3-SiO
2Glass frit.
7. according to claim 1,5, the 6 described used for solar batteries aluminum conductive electric slurries of any one, it is characterized in that the middle particle diameter D of described aluminium powder
50Be 2.0-8.0 μ m, the middle particle diameter D of glass dust
50Be 0.2-3.0 μ m.
8. used for solar batteries aluminum conductive electric slurry according to claim 1, is characterized in that, described organic carrier contains the ethyl cellulose of 3.0-15wt%, the auxiliary agent of 0.5-5.0wt% and the mixed solvent that accounts for 70-95wt%.
9. used for solar batteries aluminum conductive electric slurry according to claim 8, it is characterized in that, described mixed solvent is selected from two or more in terpinol, dibutyl phthalate, butyl carbitol, turpentine oil, butyl glycol ether, butyl carbitol acetate, ethylene glycol ether acetate, tributyl citrate, butyl carbitol acetate, dibutyl phthalate, tributyl phosphate.
10. the preparation method of used for solar batteries aluminum conductive electric slurry claimed in claim 1, it is characterized in that, comprise glass dust and inorganic additive powder are scattered in organic carrier, then add aluminium powder in batches, obtain described used for solar batteries aluminum conductive electric slurry after grinding; The middle particle diameter D of described inorganic additive powder
50Be 0.1-5.0 μ m, from one or more of beta-eucryptite, wolframic acid zirconium or vanadic acid zirconium.
11. preparation method according to claim 10 is characterized in that, the number of times of described grinding is 10-15 time, to slurry fineness＜20 μ m.
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