CN103177791B - A kind of aluminum conductive electric slurry used for solar batteries and preparation method thereof - Google Patents

Abstract

The invention provides an aluminum conductive paste for solar cells and a preparation method thereof. The components of the aluminum conductive paste for solar cells include aluminum powder, glass powder, an organic carrier and an inorganic additive powder; the inorganic additive powder The medium particle size D ₅₀ of the body is 0.1-5.0 μm, and is selected from one or more of β-eucryptite, zirconium tungstate or zirconium vanadate. After the aluminum conductive paste for solar cells provided by the invention is screen-printed onto crystalline silicon solar cells and sintered to form a film, the metal film adheres firmly to the silicon substrate, the surface is smooth and dense, without aluminum beads and blisters, and the photoelectric conversion efficiency is high. , The cell warpage is small, and the average warpage of 156×156 polycrystalline silicon solar cells is less than 0.50mm.

Description

A kind of aluminum conductive paste for solar cell and preparation method thereof

technical field

The invention belongs to the technical field of solar cells, and in particular relates to an aluminum conductive paste for solar cells and a preparation method thereof.

Background technique

Solar cells are an inexhaustible green and environmentally friendly renewable energy, and the current international research is very active. Aluminum conductive paste is one of the electronic information materials, and it is also the main auxiliary material for making solar cells. In the current manufacturing process of crystalline silicon ^solar cells, the aluminum conductive paste is printed on almost the entire backlight surface of the cell. 26×10 ^-7 /°C, 20-300°C), the difference in thermal expansion coefficient causes the aluminum conductive paste to generate stress in the silicon wafer during sintering, causing the silicon wafer to bend.

In order to further reduce the manufacturing cost of crystalline silicon solar cells and enhance their competitiveness with traditional energy generation, the thickness of silicon wafers has been gradually reduced from the previous 210 μm to the current 180 μm, and is still on a downward trend. As the thickness of silicon wafers continues to decrease, the cells are more likely to warp after the traditional aluminum paste is sintered, which directly affects the yield of solar cells and the subsequent module process. In the prior art, there are many ways to reduce the warping of silicon wafers, such as reducing the amount of transfer of aluminum paste during printing, lowering the sintering temperature, or making the substrate plastically deformed through special cooling techniques.

CN101728439A discloses the composition and preparation method of a silicon solar cell back field aluminum conductive paste, in which method by adding 0.5-6.0wt% of 2-6μm metal or non-metallic powder additives (boron, silicon, zinc, antimony, One or several kinds of tin) to improve the curvature and electrical properties of the battery formed after the aluminum paste is sintered. However, among such additives, the melting point of non-metallic powder boron and silicon is very high, far exceeding that of aluminum, and it can only be mixed with aluminum through simple machinery, so it cannot be combined with the main metal aluminum in the current general sintering process of crystalline silicon cells. A uniform alloy is formed, so the curvature of the battery sheet cannot be improved, and the photoelectric conversion efficiency of the battery may even be reduced due to the introduction of impurities. However, the metal powder zinc, antimony, and tin in this type of additive form an alloy with aluminum powder after sintering, but the expansion coefficient of the alloy formed is quite different from that of the silicon matrix of the battery sheet. The curvature of the sheet is also not beneficial. Therefore, it is still difficult to meet the low warpage requirement of the battery sheet by using the aluminum conductive paste disclosed in the prior art.

Contents of the invention

The invention solves the problems in the prior art that the silicon wafer is bent after the aluminum conductive paste of the solar cell is sintered, and the photoelectric conversion efficiency cannot meet the further development of the cell.

The invention provides an aluminum conductive paste for a solar cell, the components of the aluminum conductive paste for a solar cell include aluminum powder, glass powder, an organic carrier and an inorganic additive powder; the medium particle of the inorganic additive powder The diameter D ₅₀ is 0.1-5.0 μm, and is selected from one or more of β-eucryptite, zirconium tungstate or zirconium vanadate.

The present invention also provides a preparation method of the aluminum conductive paste for solar cells, comprising dispersing glass powder and inorganic additive powder in an organic vehicle, then adding aluminum powder in batches, and grinding to obtain the aluminum conductive paste for solar cells Slurry: The inorganic additive powder has a medium particle size D ₅₀ of 0.1-5.0 μm, and is selected from one or more of β-eucryptite, zirconium tungstate or zirconium vanadate.

The aluminum conductive paste for solar cells provided by the invention reduces the source of stress generation of the aluminum film and the silicon base layer by improving the paste formula. In the present invention, the slurry is sintered by using one or more inorganic additive powders with a median particle size _D50 of 0.1-5.0 μm and selected from β-eucryptite, zirconium tungstate or zirconium vanadate The thermal expansion coefficient of the remaining mixture can reduce the difference in thermal expansion coefficient between the sintering residue and the silicon material, thereby improving the warping problem of the battery sheet after sintering; after printing the aluminum conductive paste on the silicon substrate and sintering it to form a film, the battery The warpage of the sheet is small, the aluminum film is smooth and dense, no aluminum beads and aluminum blisters, and the photoelectric conversion efficiency is high. From the comparison of the results of Examples 1-4 and Comparative Examples 1-4, it can be seen that the crystalline silicon solar cell sheet printed with the aluminum conductive paste for solar cells provided by the present invention, the aluminum film obtained after sintering adheres firmly to the silicon substrate, The surface is smooth, free from aluminum beads and blisters, and the cell warpage is very small. The average warpage of 156×156 polycrystalline silicon solar cells is less than 0.5mm.

Detailed ways

The invention provides an aluminum conductive paste for a solar cell, the components of the aluminum conductive paste for a solar cell include aluminum powder, glass powder, an organic carrier and an inorganic additive powder; the medium particle of the inorganic additive powder The diameter D ₅₀ is 0.1-5.0 μm, and is selected from one or more of β-eucryptite, zirconium tungstate or zirconium vanadate.

Since the back-field aluminum paste commonly used in the industry is generally made of aluminum powder, glass powder, and organic carrier by stirring and grinding, after the aluminum paste is printed and sintered, what remains on the back of the silicon wafer is aluminum powder and a small amount of glass powder for bonding. Due to the large difference in the thermal expansion coefficients of metal aluminum (expansion coefficient of 232×10 ^-7 /℃, 20-300℃) and silicon (expansion coefficient of 26×10 ^-7 /℃, 20-300℃) materials, the back field After the aluminum film is cooled, stress is generated in the silicon wafer, causing the silicon wafer to bend.

The inventors of the present invention have found through a large number of experiments that by adding a certain amount of inorganic powder in the aluminum conductive paste in the present invention, this type of inorganic powder material has a relatively large negative thermal expansion coefficient and isotropy, and responds to temperature The range is wide; after this kind of negative thermal expansion inorganic powder material is mixed and ground with aluminum powder, glass powder and organic carrier in the slurry, the aluminum conductive paste for solar cells of the present invention is obtained. By using the aluminum for solar cells of the present invention Conductive paste, the coefficient of thermal expansion of the residue after paste sintering is greatly lower than that of metal aluminum, so the difference between the coefficient of thermal expansion between the residue of paste sintering and silicon material is reduced, so the thermal expansion coefficient of the residue after sintering of the battery sheet is greatly improved. warping problem.

In the present invention, the inorganic additive powder is selected from β-eucryptite, zirconium tungstate or zirconium vanadate. Among them, the average coefficient of thermal expansion of β-eucryptite within 0-1000°C is -6.4×10 ^-6 /°C. Zirconium tungstate has an isotropic negative thermal expansion effect between 0.3-777°C, and its negative thermal expansion coefficient can reach up to -8.7×10 ^-6 /°C, and its negative thermal expansion coefficient has a wide temperature range.

Therefore, the β-eucryptite, zirconium tungstate and zirconium vanadate have larger negative thermal expansion coefficients in the conventional sintering temperature range of aluminum pastes in the prior art. Therefore, in the present invention, by using β-eucryptite, zirconium tungstate or zirconium vanadate as the inorganic additive powder in the slurry, the thermal expansion coefficient of the slurry can be greatly reduced, thereby improving the warping problem of the battery sheet after sintering.

Meanwhile, in the present invention, in the aluminum conductive paste for solar cells, the medium particle diameter D ₅₀ of the inorganic additive powder used is 0.1-5.0 μm. The median particle size of the inorganic additive cannot be too large, otherwise it cannot be well filled between the aluminum powder and the glass powder, which will affect the conductivity of the sintered aluminum film and affect the battery efficiency. In addition, the median particle size of the inorganic additives should not be too small, otherwise the processing will be difficult and the material cost will increase. Preferably, the medium particle diameter D ₅₀ of the inorganic additive is 0.5-3.0 μm.

In the inorganic additive powder of the present invention, β-eucryptite (Li ₂ O · Al ₂ O ₃ · 2SiO ₂ ) can be regarded as a composition of lithium oxide, aluminum oxide and silicon oxide during the high-temperature sintering process of the slurry , zirconium tungstate (ZrO ₂ ·WO ₃ ) can be regarded as a combination of tungsten trioxide and zirconium dioxide, and zirconium vanadate (ZrO ₂ ·V ₂ O ₅ ) can be regarded as a combination of vanadium pentoxide and Composition of zirconium. Under the sintering process of crystalline silicon solar cells, the inorganic additive powder and the glass powder in the slurry are fused with each other, thereby becoming a part of the slurry binder, increasing the adhesion of the aluminum film to the silicon substrate after sintering, and also The amount of glass powder added in the slurry can be reduced to ensure the content of aluminum powder in the slurry system, so as to avoid the reduction of the photoelectric conversion efficiency of the cell due to the reduction of the conductor.

Preferably, in the present invention, the inorganic additive powder is β-eucryptite. Because β-eucryptite is easier to obtain than zirconium tungstate and zirconium vanadate, and can withstand sharp temperature changes without any change in performance. In addition, β-eucryptite has a larger average negative thermal expansion coefficient in the corresponding temperature range than zirconium tungstate and zirconium vanadate. In the present invention, the inorganic additive powder can be prepared by itself, or a commercially available product can be used directly, for example, eucryptite powder of negative expansion coefficient series from Tianjin Hongteng Electronic Ceramics Co., Ltd. can be used.

In the present invention, in the aluminum conductive paste for solar cells, the contents of aluminum powder, glass powder and inorganic carrier are all within the range commonly used by those skilled in the art, and there is no special regulation in the present invention. For example, based on the total weight of the aluminum conductive paste for solar cells, the content of aluminum powder is 60-85wt%, the content of glass powder is 0.2-8.0wt%, and the content of organic vehicle is 15-30wt%.

Based on the total weight of the aluminum conductive paste for solar cells, in the present invention, the content of the inorganic additive powder is 0.5-5.0 wt%. Although the amount of the inorganic additives is relatively small compared to the aluminum powder, according to the additivity of thermal expansion coefficients, the residual mixture obtained after sintering the slurry still has positive thermal expansion characteristics, but its expansion coefficient is greatly lower than that of metal aluminum. At the same time, the inventors of the present invention have found through experiments that too much inorganic additive powder in the slurry may affect the conductivity of the sintered aluminum film, and too little will not reduce the warpage of the cell.

In the present invention, the aluminum powder is various aluminum powders commonly used in existing aluminum conductive pastes. For example, the aluminum powder is a spherical aluminum powder with an active aluminum content of more than 98.5% obtained by a nitrogen atomization method. Preferably, the middle particle size D ₅₀ of the aluminum powder is 2.0-8.0 μm. In the present invention, the aluminum powder can directly use commercially available products, for example, spherical aluminum powder with a median particle size D50 of 2.0-8.0 μm produced by Henan Ocean Company, or a spherical aluminum powder with a _D50 of less than 8.0 μm produced by Hunan Hengchang Co., Ltd. spherical aluminum powder.

In the present invention, the glass powder can be various lead-free glass powders commonly used in the prior art, for example, Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ glass powder can be used. The composition of the Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ series glass powder is: bismuth oxide (Bi ₂ O ₃ ) accounts for 30-70 wt%, and diboron trioxide (B ₂ O ₃ ) accounts for 5-30 wt% , silicon dioxide (SiO ₂ ) accounts for 2-15wt%, calcium oxide (CaO) accounts for 1.0-5.0wt%, magnesium oxide (MgO) accounts for 0.2-8.0wt%, aluminum oxide (Al ₂ O ₃ ) accounts for 0-5.0 wt%, barium oxide (BaO) accounted for 0-3.0wt%. The Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ series glass powder can be directly purchased from commercial products, or can be synthesized by yourself. The synthesis method is: mixing the above oxide powders in proportion, melting, water quenching, The Bi ₂ O ₃ -B ₂ O ₃ -SiO ₂ -based glass powder is obtained by filtering, drying, and grinding to the desired particle size. Preferably, in the present invention, the medium particle diameter D ₅₀ of the glass powder is 0.2-3.0 microns. The initial melting point of the glass powder is 580-620°C.

The medium particle size _D50 of the above-mentioned inorganic additive powder, aluminum powder, and glass powder can be tested by existing methods and instruments for measuring medium particle size, for example, a BT-9300 laser particle size analyzer can be used for testing.

The organic vehicle of the present invention is a mixed system commonly used in the prior art containing ethyl cellulose, auxiliary agents and solvents. Based on the total mass of the organic vehicle, the content of ethyl cellulose is 3.0-15wt%, the content of auxiliary agent is 0.5-5.0wt%, and the content of solvent is 70-95wt%. Wherein, the solvent may be a combination of various solvents commonly used in the prior art, that is, a mixed solvent. For example, the mixed solvent may be selected from terpineol, dibutyl phthalate (DBP), butyl carbitol, turpentine, butyl glycol ether, butyl carbitol acetate, ethylene glycol ether Two or more of acetate, tributyl citrate, diethylene glycol monobutyl ether acetate, dibutyl phthalate, and tributyl phosphate. The auxiliary agent is selected from one or more of cetyl alcohol, stearyl alcohol, polyamide wax powder, and hydrogenated castor oil.

The present invention also provides a preparation method of the aluminum conductive paste for solar cells, comprising dispersing glass powder and inorganic additive powder in an organic vehicle, then adding aluminum powder in batches, and grinding to obtain the aluminum conductive paste for solar cells Slurry: The inorganic additive powder has a medium particle size D ₅₀ of 0.1-5.0 μm, and is selected from one or more of β-eucryptite, zirconium tungstate or zirconium vanadate.

Specifically, the preparation method of the inorganic carrier is: dissolve ethyl cellulose and auxiliary agents into a mixed solvent, fully dissolve ethyl cellulose and auxiliary agents at 20-70°C and stir evenly to obtain a transparent organic carrier.

In the present invention, in order to ensure uniform dispersion of aluminum powder, glass powder and inorganic additive powder, the aluminum powder is added in batches. Preferably, the number of batches of aluminum powder is 2-3 times, stir evenly after each addition, and then add the next batch; after adding all the powder, stir evenly at high speed. The grinding can be carried out by using a three-roller grinder, and the grinding times are 10-15 times until the slurry fineness is less than 20 μm, that is, the conductive paste for solar cells provided by the present invention is obtained.

Below by embodiment the present invention will be further described. The raw materials used in the examples and comparative examples were obtained from commercial purchases.

Example 1

This example is used to illustrate the solar cell conductive paste disclosed in the present invention and its preparation method.

(1) Preparation of glass powder

Take 55wt% bismuth oxide (Bi ₂ O ₃ ), 25wt% boron trioxide (B ₂ O ₃ ), 15wt% silicon dioxide (SiO ₂ ), 3.5wt% calcium oxide (CaO), 1.5wt% Use a V-type mixer to mix the components evenly, put it into a porcelain crucible, put it into a silicon carbide rod furnace, heat it up to 550°C, keep it for 0.5h, then raise it to 1250°C, and melt 0.5h, water quenching and filtering, put the obtained glass beads into a ball mill jar, control the mass ratio of zirconia balls: glass beads: deionized water = 4:1:0.6, rotate at 250 rpm, ball mill for 7 hours, filter and dry , and then dry milled for 0.5h. During the dry milling, the mass ratio of zirconia balls to glass powder was 1:2, and the glass powder with a median particle size D ₅₀ of 1.5 μm was obtained for later use.

(2) Preparation of organic carrier

According to the mass ratio of butyl carbitol: terpineol: butyl carbitol acetate: dibutyl phthalate (DBP) = 75:10:10:5, mix the organic solvents evenly to obtain a mixed solvent . Take 90 parts by weight of mixed solvent, add 7.5 parts by weight of ethyl cellulose STD-4 (product of Dow, viscosity is 4), 2 parts by weight of hydrogenated castor oil, 0.5 parts by weight of cetyl alcohol, heat to 70 ° C to fully dissolve , and stir evenly to obtain a uniform and clear organic vehicle.

(3) Preparation of aluminum conductive paste

Take 22 parts by weight of the organic carrier prepared in step (2), put it in the stainless steel tank of the high-speed disperser, add 1.5 parts by weight of glass powder prepared in step (1) and 2.5 parts by weight of β-euxia Stone powder (Tianjin Hongteng Electronic Ceramics Co., Ltd., medium particle size _D50 is 1.5 μm), and stirred evenly. Then add 74 parts by weight of spherical aluminum powder (ultra-pure aluminum powder produced by Henan Yuanyang Company, with a median particle size _D50 of 4.5 μm) in two batches. After each batch of aluminum powder is added, stir evenly before adding the next batch After all the addition is complete, stir evenly at high speed; finally use a Ø150 three-roll mill to grind 15 times until the slurry fineness is less than 20 µm to obtain the aluminum conductive paste for solar cells of this embodiment, which is denoted as S1.

Example 2

The same steps as in Example 1 were used to prepare the aluminum conductive paste S2 for solar cells in this example, except that in step (3), the amount of β-eucryptite powder was changed from 2.5 parts by weight to 5 parts by weight, The consumption of glass powder is changed into 0.5 weight part by 1.5 weight part, and the consumption of aluminum powder is changed into 72.5 weight part by 74 weight part.

Example 3

The same steps as in Example 1 were used to prepare the aluminum conductive paste S2 for solar cells in this example, except that in step (3), the median particle size D ₅₀ of β-eucryptite powder was changed from 1.5 μm to 5.0 μm.

Example 4

The same steps as in Example 1 were used to prepare the aluminum conductive paste S2 for solar cells in this example, except that in step (3), zirconium tungstate was used instead of the β-eucryptite powder in Example 1.

Comparative example 1

The same steps as in Example 1 were used to prepare the aluminum conductive paste DS1 for solar cells of this comparative example, the difference is that: in step (3), no β-eucryptite powder was added, and the amount of glass powder was changed from 1.5 parts by weight Change to 4 parts by weight.

Comparative example 2

The same steps as in Example 1 were used to prepare the aluminum conductive paste DS2 for solar cells of this comparative example, the difference is that: in step (3), no β-eucryptite powder was added, and the amount of glass powder was changed from 1.5 parts by weight Changed to 2.5 parts by weight, the consumption of aluminum powder was changed from 74 parts by weight to 75.5 parts by weight.

Comparative example 3

The same steps as in Example 1 were used to prepare the aluminum conductive paste DS3 for solar cells in this comparative example, except that in step (3), the median particle size D ₅₀ of β-eucryptite powder was changed from 1.5 μm to 6.0 μm.

Comparative example 4

The method of CN101728439A is used to prepare the solar cell aluminum conductive paste DS4 of this comparative example, the specific steps are the same as in Example 1, the difference is that in step (3), 2.5 parts by weight of the medium particle diameter D ₅₀ is 3.5 microns Boron powder replaces 2.5 parts by weight of β-eucryptite powder in Example 1.

Performance Testing

The above-mentioned aluminum conductive pastes S1-S4 and DS1-DS4 for solar cells were tested in the production line respectively. Specifications of polysilicon wafer: 156156mm, thickness 200μm (before corrosion), thickness 180μm before printing. First use 200-mesh screen printing back silver electrode paste (DuPont PV505), dry, and then use 280-mesh screen printing aluminum conductive paste S1-S4 and DS1-DS4 for solar cells, the printing weight is 1.5 grams of slurry, the drying temperature is 125 ° C, the drying time is 4 minutes, and then use 200 mesh screen printing front silver electrode paste (DuPont 16C), drying and sintering in a tunnel furnace, the temperature gradient distribution of the tunnel furnace, passing through the tunnel The furnace time is 2min, the sintering peak temperature is 89010°C, and the time is 2s. After the furnace is released, the performance of each cell S10-S40 and DS10-DS40 is tested.

(1) Surface condition: visually inspect the surface condition of the back field, if it is smooth, without aluminum beads or blisters, it is recorded as OK, otherwise it is NG.

(2) Adhesion: Soak each cell in tap water for 7 days at room temperature, if the metal film on the back field does not fall off or scrape lightly with a blunt object, it is recorded as OK, otherwise it is NG.

(3) Warpage: Measure the curvature of the battery sheet with a vernier caliper, and the unit is mm. Repeat 100 times and record the average value of warpage.

(4) Photoelectric conversion efficiency: Test each cell with a single flash simulator according to the method disclosed in IEC904-1. The test conditions are standard test conditions (STC): light intensity: 1000W/m ² ; spectrum: AM1.5; temperature: 25°C. Repeat 100 times, and record the average value of the photoelectric conversion efficiency.

The test results are shown in Table 1 and Table 2.

Table 1

Test items S10 S20 S30 S40 surface condition OK OK OK OK Adhesion OK OK OK OK Warpage (mm) 0.10-0.30 0.30-0.50 0.30-0.50 0.20-0.40 Photoelectric conversion efficiency 17. 40% 17.23% 17.25% 17.31%

Table 2

Test items DS10 DS20 DS30 DS40 surface condition OK OK OK OK Adhesion OK OK NG NG Warpage (mm) 0.80-1.10 1.20-1.50 0.40-0.60 0.80-1.00 Photoelectric conversion efficiency 17.18% 17.22% 17.23% 17.12%

From the comparison of the results in Table 1 and Table 2, it can be seen that the aluminum film obtained is smooth and compact without aluminum beads after screen printing on a crystalline silicon solar cell with the aluminum conductive paste for solar cells provided by the present invention and sintered to form a film. , aluminum blisters, high photoelectric conversion efficiency, small cell warpage, and the average warpage of 156×156 polycrystalline silicon solar cells is less than 0.50mm.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (11)

1. an aluminum conductive electric slurry used for solar batteries, is characterized in that, the component of described aluminum conductive electric slurry used for solar batteries comprises aluminium powder, glass dust, organic carrier and inorganic additive powder; With the total weight of described aluminum conductive electric slurry used for solar batteries for benchmark, the content of described inorganic additive powder is 0.5-5.0wt%, the middle particle diameter D of described inorganic additive powder ₅₀for 0.1-5.0 μm, and be selected from one or more of beta-eucryptite, tungsten wire array or vanadic acid zirconium.

2. aluminum conductive electric slurry used for solar batteries according to claim 1, is characterized in that, described inorganic additive powder is beta-eucryptite.

3. aluminum conductive electric slurry used for solar batteries according to claim 1, is characterized in that, the middle particle diameter D of described inorganic additive powder ₅₀for 0.5-3.0 μm.

4. the aluminum conductive electric slurry used for solar batteries according to any one of claim 1-3, it is characterized in that, with the total weight of described aluminum conductive electric slurry used for solar batteries for benchmark, the content of aluminium powder is 60-85wt%, the content of glass dust is 0.2-8.0wt%, and the content of organic carrier is 15-30wt%.

5. aluminum conductive electric slurry used for solar batteries according to claim 1, is characterized in that, described aluminium powder is the atomization ball aluminum powder of active aluminium content more than 98.5%.

6. aluminum conductive electric slurry used for solar batteries according to claim 1, is characterized in that, described glass dust is Bi ₂o ₃-B ₂o ₃-SiO ₂glass frit.

7. the aluminum conductive electric slurry used for solar batteries according to any one of claim 1,5,6, is characterized in that, the middle particle diameter D of described aluminium powder ₅₀for 2.0-8.0 μm, the middle particle diameter D of glass dust ₅₀for 0.2-3.0 μm.

8. aluminum conductive electric slurry used for solar batteries according to claim 1, is characterized in that, described organic carrier contains the ethyl cellulose of 3.0-15wt%, auxiliary agent and the mixed solvent accounting for 70-95wt% of 0.5-5.0wt%.

9. aluminum conductive electric slurry used for solar batteries according to claim 8, it is characterized in that, described mixed solvent be selected from terpinol, dibutyl phthalate, butyl carbitol, turpentine oil, butyl glycol ether, butyl carbitol acetate, ethylene glycol ether acetate, tributyl citrate, butyl carbitol acetate, tributyl phosphate two or more.

10. the preparation method of aluminum conductive electric slurry used for solar batteries according to claim 1, it is characterized in that, comprise and glass dust and inorganic additive powder are scattered in organic carrier, then add aluminium powder in batches, after grinding, obtain described aluminum conductive electric slurry used for solar batteries; The middle particle diameter D of described inorganic additive powder ₅₀for 0.1-5.0 μm, from one or more of beta-eucryptite, tungsten wire array or vanadic acid zirconium.

11. preparation methods according to claim 10, is characterized in that, the number of times of described grinding is 10-15 time, to slurry fineness < 20 μm.