Modified glass powder for TOPCon battery fine grid and preparation method of modified glass powder

Abstract

The invention relates to the technical field of photovoltaic materials, in particular to modified glass powder for a TOPCon battery fine grid and a preparation method thereof.The modified glass powder is at least prepared from, by weight, 30-50 parts of precious metal-loaded main glass powder, 30-50 parts of auxiliary glass powder, 15-25 parts of an ethanol water solution, 0.1-0.5 part of a surfactant and 0.5-1 part of a disilane modifier, the disilane modifier comprises amino silane and C12-C18 long-chain alkylsilane, and the noble metal nanoparticles are loaded to synergistically modify with disilane, so that the surface energy of the glass powder is reduced to 18-22 mN / m while the low-temperature sintering characteristic is maintained, and the inorganic glass powder, the organic carrier and the silver powder achieve the optimal matching effect.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic materials, and in particular to a modified glass powder for TOPCon battery fine grids and a preparation method thereof. Background Art

[0002] With the rapid development of N-type battery technologies such as HJT (intrinsic thin-film heterojunction cell) and TOPCon (oxide-passivated contact cell), higher requirements are being placed on the printing precision of fine-grid silver pastes for batteries. Traditional glass powder used in conductive silver pastes suffers from poor compatibility with the organic carrier in the paste due to the inherent properties of inorganic materials, which can easily lead to defects such as broken grids and high-low junctions during printing. A Chinese patent application (publication number CN 119371108 A) discloses a modified glass powder for low-silver-content conductive silver paste, its preparation method, and applications. This process utilizes nanosilver-loaded glass powder. While this improves battery performance to a certain extent, it does not address the compatibility issues at the organic-inorganic interface. Many patents and publications utilize silane coupling agents to modify the glass surface. However, in practice, the results are less than ideal, often resulting in uneven surface modification. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a modified glass powder for TOPCon battery fine grid. By loading precious metal nanoparticles and synergistically modifying with disilane, the surface energy of the glass powder is reduced to 18-22mN / m while maintaining the low-temperature sintering characteristics, so that the inorganic glass powder is optimally matched with the organic carrier and silver powder.

[0004] On the one hand, the present invention provides a modified glass powder for TOPCon battery fine grid, wherein the raw materials for its preparation include at least 30-50 parts by weight of noble metal loaded main glass powder, 30-50 parts by weight of auxiliary glass powder, 15-25 parts by weight of ethanol aqueous solution, 0.1-0.5 parts by weight of surfactant, and 0.5-1 parts by weight of disilane modifier, wherein the disilane modifier includes aminosilane and C 12 -C 18 Long-chain alkylsilane.

[0005] In one embodiment, the noble metal-loaded main glass powder includes at least nano-gold-loaded main glass powder.

[0006] In one embodiment, the aminosilane is selected from at least one of γ-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, diethylenetriaminopropyltrimethoxysilane, and N-(n-butyl)-3-aminopropyltrimethoxysilane.

[0007] In one embodiment, the C 12 -C 18The long-chain alkylsilane is selected from at least one of hexadecyltrimethoxysilane, dodecyltrimethoxysilane and octadecyltrimethoxysilane.

[0008] In one embodiment, the dual silane modifier includes gamma-aminopropyltriethoxysilane and hexadecyltrimethoxysilane.

[0009] In one embodiment, the volume ratio of the γ-aminopropyltriethoxysilane to hexadecyltrimethoxysilane is 1:(2-5).

[0010] In one embodiment, the volume ratio of γ-aminopropyltriethoxysilane to hexadecyltrimethoxysilane is 1:2, 1:3, 1:4, or 1:5.

[0011] The present invention performs double silane surface modification on the main glass powder and auxiliary glass powder loaded with precious metals, so that the obtained glass powder has significantly improved application effects, the prepared silver paste has good printing effects on the front of the TOPCon battery cell, and the battery efficiency of the obtained battery is high. Specifically, by adopting a melt quenching combined with an alcohol reduction method to load nano-gold or nano-silver precious metal particles on the surface of the main glass powder, the provided modified glass powder can achieve good ohmic contact with the battery silicon substrate under lower sintering temperature conditions in subsequent applications, and work together with the auxiliary glass powder to obtain appropriate etching ability and suitable glass viscosity-temperature characteristics. Furthermore, by using a double silane modifier compounded with γ-aminopropyltriethoxysilane and hexadecyltrimethoxysilane to perform surface hydrophobic modification on the main glass powder and auxiliary glass powder loaded with precious metals, the affinity with silver powder and organic carriers is significantly improved, which is conducive to improving the printing effect of the silver paste to obtain narrower line widths and higher line heights, thereby obtaining better battery efficiency.

[0012] In one embodiment, the method for preparing the noble metal loaded main glass powder comprises the following steps:

[0013] The main glass powder is dispersed in an ethylene glycol aqueous solution, and a noble metal source is added and stirred to disperse to obtain a mixed solution. The mixed solution is ultrasonically treated and then deposited. Stirring is continued during the deposition process. After the reaction is completed, the noble metal-loaded main glass powder is obtained by centrifugation, washing, drying and screening.

[0014] In one embodiment, the noble metal source is chloroauric acid solution or silver nitrate.

[0015] In one embodiment, the concentration of the main glass powder in the mixture is 0.15-0.3 g / mL.

[0016] In one embodiment, the concentration of the main glass powder in the mixture is 0.25 g / mL.

[0017] In one embodiment, the added amount of the noble metal source is 0.5-1.2% of the mass of the main glass powder.

[0018] In one embodiment, the added amount of the noble metal source is 1% of the mass of the main glass powder.

[0019] In one embodiment, the concentration of the ethylene glycol aqueous solution is 8-15 wt %.

[0020] In one embodiment, the concentration of the ethylene glycol aqueous solution is 10 wt %.

[0021] In one embodiment, the stirring and dispersing is carried out at a temperature of 20-30° C. and for a time of 15-30 min.

[0022] In one embodiment, the ultrasonic treatment instrument is an ultrasonic cell disruptor, the temperature is 20-30° C., and the time is 5-15 min.

[0023] In one embodiment, when the noble metal source is a chloroauric acid solution, the deposition temperature is 170-190° C., and the deposition time is 0.5-1.5 h.

[0024] In one embodiment, when the noble metal source is silver nitrate, the deposition temperature is 70-90° C. and the deposition time is 0.5-1.5 h.

[0025] In one embodiment, the drying temperature is 60-70° C. and the drying time is 3-5 hours.

[0026] In one embodiment, the screening instrument is a sieve, and the aperture of the sieve is 200 mesh.

[0027] In one embodiment, the main glass powder includes at least the following components, by weight: 5-25 parts of silicon oxide, 1-5 parts of aluminum oxide, 10-15 parts of zinc oxide, 45-65 parts of lead oxide, 5-15 parts of boron oxide, 10-30 parts of bismuth oxide and 1-10 parts of silver oxide.

[0028] In one embodiment, the main glass powder includes at least the following components, in parts by weight: 20 parts of silicon oxide, 1 part of aluminum oxide, 10 parts of zinc oxide, 48 parts of lead oxide, 6 parts of boron oxide, 14 parts of bismuth oxide, and 1 part of silver oxide.

[0029] In one embodiment, the preparation method of the main glass powder includes the following steps: weighing silicon oxide, aluminum oxide, zinc oxide, lead oxide, boron oxide, bismuth oxide and silver oxide according to weight parts, adding them into a platinum crucible after stirring, placing them in a muffle furnace for melting, setting the temperature at 1000-1350°C, melting for 20-40 minutes, and obtaining the main glass powder through cold rolling, ball milling and air flow grinding.

[0030] In one embodiment, the secondary glass powder includes at least the following components, by weight: 1-5 parts of aluminum oxide, 20-40 parts of silicon oxide, 1-5 parts of zinc oxide, 20-55 parts of lead oxide, 10-15 parts of boron oxide, 1-3 parts of lithium carbonate, and 10-15 parts of bismuth oxide.

[0031] In one embodiment, the secondary glass powder includes the following components, in parts by weight: 2 parts of aluminum oxide, 30 parts of silicon oxide, 2 parts of zinc oxide, 43.5 parts of lead oxide, 10 parts of boron oxide, 2 parts of lithium carbonate, and 10.5 parts of bismuth oxide.

[0032] In one embodiment, the preparation method of the secondary glass powder comprises the following steps: weighing aluminum oxide, silicon oxide, zinc oxide, lead oxide, boron oxide, lithium carbonate and bismuth oxide in parts by weight, adding them into a platinum crucible after stirring, placing them in a muffle furnace for melting, setting the temperature at 1000-1350°C, melting for 20-40 minutes, and obtaining the secondary glass powder through cold rolling, ball milling and air flow grinding.

[0033] In one embodiment, the ball milling apparatus is a planetary ball mill, the diameter of the spherical zirconia beads is 8-10 mm, and the total weight ratio of the spherical zirconia beads to the main glass powder or the auxiliary glass powder is 5:1.

[0034] In one embodiment, the ball milling speed is 200-500 rpm, and the ball milling time is 120-240 min.

[0035] In one embodiment, the coarse glass powder after ball milling is sieved using a 200-mesh sieve.

[0036] In one embodiment, the apparatus for the airflow milling treatment is an airflow mill, the airflow mill pressure is 0.8-1.2 MPa, and the treatment time is 10-20 min.

[0037] The D50 particle size of the main glass powder and the auxiliary glass powder is 1.4-1.6 μm.

[0038] In one embodiment, the volume ratio of ethanol to water in the ethanol aqueous solution is 1:9.

[0039] In one embodiment, the surfactant includes at least a nonionic surfactant.

[0040] In one embodiment, the non-ionic surfactant is Pluronic F127.

[0041] Another aspect of the present invention provides a method for preparing modified glass powder for TOPCon battery fine grids, comprising at least the following steps:

[0042] (1) dispersing the noble metal-loaded main glass powder and the auxiliary glass powder in an ethanol aqueous solution according to parts by weight to obtain a dispersion;

[0043] (2) adding the dispersion into a planetary ball mill, adding a surfactant, and ball milling using spherical zirconia beads for 10-20 minutes;

[0044] (3) adding a disilane modifier and ball milling at a speed of 280 to 350 rpm for 20 to 40 minutes to obtain a mixture;

[0045] (4) The mixture is sieved with a 300-400 mesh sieve, placed in an oven at 110-130° C. for heat preservation for 0.8-1.5 hours, and sieved with a 200-250 mesh sieve to obtain modified glass powder for TOPCon battery fine grid.

[0046] In one embodiment, the diameter of the spherical zirconia beads is 8-10 mm, and the total weight ratio of the spherical zirconia beads to the raw materials for preparing the modified glass powder for TOPCon battery fine grids is 1:1.

[0047] The present invention optimizes the modified glass powder formula system and controls the preparation process conditions so that the provided modified glass powder meets the low-temperature sintering requirements, has a small battery series resistance, a high fill factor, and a good screen printing effect, thereby better meeting practical application needs.

[0048] Beneficial effects

[0049] 1. The present invention provides a modified glass powder for TOPCon battery fine grid. By loading precious metal nanoparticles and synergistically modifying with disilane, the surface energy of the glass powder is reduced to 18-22 mN / m while maintaining low-temperature sintering characteristics, thereby achieving the best matching effect between the inorganic glass powder, the organic carrier and the silver powder.

[0050] 2. The present invention performs double silane surface modification on the precious metal loaded main glass powder and auxiliary glass powder, so that the obtained glass powder has significantly improved application effect, the prepared silver paste has good printing effect on the front of the TOPCon battery cell, and the battery efficiency of the obtained battery is high.

[0051] 3. The present invention loads nano-gold or nano-silver precious metal particles on the surface of the main glass powder by using a melt quenching combined with an alcohol reduction method, so that the provided modified glass powder can achieve good ohmic contact with the battery silicon substrate under lower sintering temperature conditions in subsequent applications, and work together with the secondary glass powder to obtain appropriate etching ability and suitable glass viscosity-temperature characteristics.

[0052] 4. The present invention uses a double silane modifier composed of γ-aminopropyltriethoxysilane and hexadecyltrimethoxysilane to perform surface hydrophobic modification on the main glass powder and the auxiliary glass powder loaded with precious metals, which significantly improves the affinity between the silver powder and the organic carrier, and is beneficial to improving the printing effect of the silver paste to obtain a narrower line width and a higher line height, thereby obtaining better battery efficiency.

[0053] 5. The present invention optimizes the modified glass powder formula system and controls the preparation process conditions so that the provided modified glass powder meets the low-temperature sintering requirements, has a small battery series resistance, a high fill factor, and a good screen printing effect, which better meets the actual application needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is the SEM characterization result of the nano-gold loaded main glass powder provided in Example 1. Figure 1 The upper middle picture is magnified 20,000 times, and the lower picture is magnified 100,000 times.

[0055] Figure 2 This is the line width and line height result diagram of the product in Example 1.

[0056] Figure 3 This is the line width and line height result diagram of the product in Example 2.

[0057] Figure 4 This is the line width and height result diagram of the product in comparative example 1.

[0058] Figure 5 This is the line width and height result diagram of the product in comparative example 2. DETAILED DESCRIPTION

[0059] Example 1

[0060] On the one hand, Example 1 of the present invention provides a modified glass powder for TOPCon battery fine grid. Its preparation raw materials include, by weight: 30 parts of precious metal-loaded main glass powder, 30 parts of auxiliary glass powder, 20 parts of ethanol aqueous solution, 0.1 parts of surfactant, and 0.5 parts of disilane modifier. The precious metal-loaded main glass powder is nano-gold-loaded main glass powder, and the disilane modifier includes γ-aminopropyltriethoxysilane and hexadecyltrimethoxysilane in a volume ratio of 1:3.

[0061] The preparation method of the nano-gold loaded main glass powder comprises the following steps:

[0062] The main glass powder is dispersed in an ethylene glycol aqueous solution, and a chloroauric acid solution (0.1 wt%) is added and stirred to disperse to obtain a mixed solution. The mixed solution is ultrasonically treated and then deposited. Stirring is continued during the deposition process. After the reaction is completed, the precious metal-loaded main glass powder is obtained by centrifugation, washing, drying and sieving.

[0063] The concentration of the main glass powder in the mixture is 0.25 g / mL.

[0064] The added amount of the noble metal source is 1% of the mass of the main glass powder.

[0065] The concentration of the ethylene glycol aqueous solution is 10 wt %.

[0066] The stirring and dispersing was performed at a temperature of 25° C. and for 20 minutes.

[0067] The ultrasonic treatment was performed using an ultrasonic cell disruptor at a temperature of 25° C. for 10 min.

[0068] The deposition temperature is 180° C. and the deposition time is 1 h.

[0069] The drying temperature is 65° C. and the drying time is 3 hours.

[0070] The screening instrument is a sieve, and the aperture of the sieve is 200 meshes.

[0071] The main glass powder includes the following components in parts by weight: 20 parts of silicon oxide, 1 part of aluminum oxide, 10 parts of zinc oxide, 48 parts of lead oxide, 6 parts of boron oxide, 14 parts of bismuth oxide and 1 part of silver oxide.

[0072] The preparation method of the main glass powder comprises the following steps: silicon oxide, aluminum oxide, zinc oxide, lead oxide, boron oxide, bismuth oxide and silver oxide are weighed according to weight, stirred and added into a platinum crucible, placed in a muffle furnace for melting at a set temperature of 1100° C. for 30 minutes, and subjected to cold rolling, ball milling and air flow grinding to obtain the main glass powder.

[0073] The secondary glass powder includes the following components in parts by weight: 2 parts of aluminum oxide, 30 parts of silicon oxide, 2 parts of zinc oxide, 43.5 parts of lead oxide, 10 parts of boron oxide, 2 parts of lithium carbonate and 10.5 parts of bismuth oxide.

[0074] The preparation method of the secondary glass powder comprises the following steps: weighing aluminum oxide, silicon oxide, zinc oxide, lead oxide, boron oxide, lithium carbonate and bismuth oxide according to parts by weight, stirring and adding them into a platinum crucible, placing them in a muffle furnace for melting, setting the temperature at 1200° C., melting for 30 minutes, and cold rolling, ball milling and air flow grinding to obtain the secondary glass powder.

[0075] The ball milling apparatus is a planetary ball mill, the diameter of the spherical zirconia beads is 10 mm, and the total weight ratio of the spherical zirconia beads to the main glass powder or the auxiliary glass powder is 5:1.

[0076] The ball milling speed is 350 rpm, and the ball milling time is 180 min.

[0077] The coarse glass powder after ball milling is sieved using a 200-mesh sieve.

[0078] The air flow milling apparatus is an air flow mill, the air flow milling pressure is 1.0 MPa, and the processing time is 10 min.

[0079] The D50 particle size of the main glass powder and the auxiliary glass powder is 1.5 μm.

[0080] The volume ratio of ethanol to water in the ethanol aqueous solution is 1:9.

[0081] The surfactant is a non-ionic surfactant, and the model of the non-ionic surfactant is Pluronic F127.

[0082] On the other hand, embodiment 1 of the present invention provides a method for preparing modified glass powder for TOPCon battery fine grid, comprising the following steps:

[0083] (1) dispersing the noble metal-loaded main glass powder and the auxiliary glass powder in an ethanol aqueous solution according to parts by weight to obtain a dispersion;

[0084] (2) The dispersion was added to a planetary ball mill, a surfactant was added, and ball milling was performed using spherical zirconia beads for 15 min;

[0085] (3) adding a disilane modifier and ball milling at 300 rpm for 30 min to obtain a mixture;

[0086] (4) The mixture was sieved with a 300-mesh sieve, placed in an oven at 120° C. for 1 hour, and sieved with a 200-mesh sieve to obtain modified glass powder for TOPCon battery fine grid.

[0087] The diameter of the spherical zirconia beads is 8 mm, and the total weight ratio of the spherical zirconia beads to the modified glass powder for preparing the TOPCon battery fine grid is 1:1.

[0088] Example 2

[0089] Example 2 of the present invention provides a modified glass powder for TOPCon battery fine grid and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that the nano-gold-loaded main glass powder is replaced by nano-silver-loaded main glass powder, the chloroauric acid solution is replaced by silver nitrate, and the deposition temperature is 75°C and the time is 1 hour.

[0090] Comparative Example 1

[0091] Comparative Example 1 of the present invention provides a modified glass powder for TOPCon battery fine grid and a preparation method thereof. The specific implementation manner is the same as that of Example 2, except that the addition amount of the disilane modifier is 0 parts by weight.

[0092] Comparative Example 2

[0093] Comparative Example 2 of the present invention provides a modified glass powder for TOPCon battery fine grid and a preparation method thereof. Its specific implementation method is the same as Example 1, except that the noble metal-loaded main glass powder is replaced by main glass powder (without noble metal loading).

[0094] Performance Testing

[0095] 1. The nano-gold loaded main glass powder provided in Example 1 was characterized by SEM. The results are shown in Figure 1 .

[0096] 2. The modified glass powder for TOPCon cell fine grids provided in the examples and comparative examples was used to prepare silver paste for cell fine grids according to formula table 1. The obtained silver paste was screen-printed on the front of 182mm×182mm TOPCon cell sheets. The silver paste was uniformly printed on the back of the cell sheets. The cells were sintered at a peak temperature of 700°C in a sintering furnace and light was injected. The cells were then passed through a LECO device for laser-assisted sintering to obtain 4 groups of cells (50 cells were used for each group of examples and comparative examples, and the corresponding efficiency data were expressed as average values). The photoelectric conversion efficiency (Eff), open circuit voltage (Uoc), short circuit current (Isc), fill factor (FF), series resistance (Rser), and parallel resistance (Rsh) of each group of cells were tested by current-voltage performance. The test results are shown in Table 2. At the same time, the printing effect of the silver paste prepared in the examples and comparative examples was evaluated. The evaluation contents included: printing line width, printing line height, contact angle, and surface energy. The surface energy was obtained by the tablet pressing method (Owens-Wendt two-component method). The results are shown in Table 3 and Figure 2-5 .

[0097] Table 1

[0098]

[0099] In Table 1, "2.0 Example 1" means adding 2.0 parts by weight of modified glass powder prepared in Example 1 to silver paste 1, and the design concept of "2.0 Example 2", "2.0 Example 3" and "2.0 Example 4" is the same as that of "2.0 Example 1".

[0100] The organic vehicle in Table 1 comprises, by mass percentage, 2.5% ethyl cellulose (Dow Chemical QP-100), 2% acrylic resin, 60% terpineol, 20% diethylene glycol methyl ether, 14.5% butyl carbitol acetate, and 1% lecithin. The low-silver, TOPCon-containing, fine grid silver paste is prepared by mixing silver powder, modified glass powder, an organic vehicle, and a solvent.

[0101] Table 2

[0102]

[0103]

[0104] Table 3

[0105] project Silver paste 1 Silver paste 2 Silver paste 3 Silver paste 4 Contact angle (°) 138 142 65 73 Surface energy (mN / m) 19.2 18.7 45.3 38.1 Line height (μm) 6.76 7.62 5.71 6.26 Line width (μm) 25.66 25.88 34.95 31.96

[0106] By analyzing Table 2 and Table 3, it can be seen that the main glass powders of Examples 1, 2 and Comparative Example 1 are respectively loaded with nano-gold and nano-silver, which are more likely to form better contact, thereby making the battery series resistance smaller and the filling factor higher, and the effect of nano-gold is more obvious than that of nano-silver. Comparing Examples 1 and 2 with Comparative Example 1, which has not been treated with bisilane, it can be clearly found that the line width of Comparative Example 1 is wider and the line height is shorter. And it can be clearly seen from the contact angle that Examples 1 and 2 are both in a hydrophobic state after treatment, and the surface energy is significantly reduced. The above test results show that the glass powder loaded with nano-noble metals and surface modified with bisilane can effectively improve the battery efficiency while improving the printing effect.

Claims

1. A modified glass powder for TOPCon battery fine grid, characterized in that: The raw materials for its preparation include at least 30-50 parts of noble metal loaded main glass powder, 30-50 parts of auxiliary glass powder, 15-25 parts of ethanol aqueous solution, 0.1-0.5 parts of surfactant, and 0.5-1 parts of disilane modifier, wherein the disilane modifier includes aminosilane and C 12 -C 18 Long-chain alkylsilane.

2. The modified glass powder for TOPCon battery fine grid according to claim 1, characterized in that: The method for preparing the noble metal-loaded main glass powder comprises the following steps: dispersing the main glass powder into an ethylene glycol aqueous solution, adding a noble metal source, stirring and dispersing the mixture to obtain a mixed solution, ultrasonically treating the mixed solution and then depositing the mixed solution, continuously stirring the solution during the deposition process, and after the reaction is completed, centrifuging, washing, drying, and sieving to obtain the noble metal-loaded main glass powder.

3. The modified glass powder for TOPCon battery fine grid according to claim 1, characterized in that: The noble metal loaded main glass powder at least includes nano-gold loaded main glass powder.

4. The modified glass powder for TOPCon battery fine grid according to claim 1, characterized in that: The aminosilane is selected from at least one of γ-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, diethylenetriaminopropyltrimethoxysilane and N-(n-butyl)-3-aminopropyltrimethoxysilane.

5. The modified glass powder for TOPCon battery fine grid according to claim 1, characterized in that: The C 12 -C 18 The long-chain alkylsilane is selected from at least one of hexadecyltrimethoxysilane, dodecyltrimethoxysilane and octadecyltrimethoxysilane.

6. The modified glass powder for TOPCon battery fine grid according to claim 1, characterized in that: The bisilane modifier includes gamma-aminopropyltriethoxysilane and hexadecyltrimethoxysilane.

7. The modified glass powder for TOPCon battery fine grid according to claim 2, characterized in that: The main glass powder comprises at least the following components in parts by weight: 5-25 parts of silicon oxide, 1-5 parts of aluminum oxide, 10-15 parts of zinc oxide, 45-65 parts of lead oxide, 5-15 parts of boron oxide, 10-30 parts of bismuth oxide and 1-10 parts of silver oxide.

8. The modified glass powder for TOPCon battery fine grid according to claim 1, characterized in that: The secondary glass powder comprises at least the following components in parts by weight: 1-5 parts of aluminum oxide, 20-40 parts of silicon oxide, 1-5 parts of zinc oxide, 20-55 parts of lead oxide, 10-15 parts of boron oxide, 1-3 parts of lithium carbonate and 10-15 parts of bismuth oxide.

9. The modified glass powder for TOPCon battery fine grid according to claim 1, characterized in that: The surfactant includes at least a nonionic surfactant.

10. A method for preparing the modified glass powder for TOPCon battery fine grid according to any one of claims 1 to 9, characterized in that: At least the following steps are included: (1) dispersing the noble metal-loaded main glass powder and the auxiliary glass powder in an ethanol aqueous solution according to parts by weight to obtain a dispersion; (2) adding the dispersion into a planetary ball mill, adding a surfactant, and ball milling using spherical zirconia beads for 10-20 minutes; (3) adding a disilane modifier and ball milling at a speed of 280 to 350 rpm for 20 to 40 minutes to obtain a mixture; (4) The mixture is sieved with a 300-400 mesh sieve, placed in an oven at 110-130° C. for heat preservation for 0.8-1.5 hours, and sieved with a 200-250 mesh sieve to obtain modified glass powder for TOPCon battery fine grid.

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