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CN-121974568-A - Modified glass powder and preparation method thereof, battery back electrode slurry, battery and application

CN121974568ACN 121974568 ACN121974568 ACN 121974568ACN-121974568-A

Abstract

The application relates to the technical field of photovoltaic energy, in particular to modified glass powder, a preparation method thereof, battery back electrode slurry, a battery and application. The raw materials of the modified glass powder comprise oxides and/or carbonates of lead, tellurium, silicon, lithium and niobium elements and auxiliary modifying elements for adjusting the physical and chemical properties of the modified glass powder. The molar percentage of each element is 15-40% of lead, 20-45% of tellurium, 5-35% of silicon, 5-25% of lithium, more than 0 and less than or equal to 10% of niobium and 5-25% of auxiliary modifying elements. The preparation method comprises the steps of uniformly mixing oxides and/or carbonates of lead, tellurium, silicon, lithium, niobium and auxiliary modification elements to obtain a raw material mixture, melting and cooling to obtain glass solid, and grinding to obtain the modified glass powder. Therefore, the formula of the modified glass powder provided by the application can enable the modified glass powder to have low thermal expansion coefficient, high chemical stability and high vitrification, not only can greatly improve the acetic acid corrosion resistance of the tunneling oxide layer passivation contact solar cell, but also can meet the metallization process of the back surface of the N-type cell, form good contact, and can be matched with different mainstream cell processes.

Inventors

  • XU JIANCHAO
  • FENG JIWEI
  • YAN LI
  • GUO CUIWEN

Assignees

  • 浙江光达电子科技有限公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (11)

  1. 1. A modified glass powder, characterized in that the raw materials of the modified glass powder comprise oxides and/or carbonates containing lead element, tellurium element, silicon element, lithium element, niobium element and auxiliary modifying elements for adjusting the physical and chemical properties of the modified glass powder; the lead-containing alloy comprises 15% -40% of lead, 20% -45% of tellurium, 5% -35% of silicon, 5% -25% of lithium, more than 0 and less than or equal to 10% of niobium and 5% -25% of auxiliary modifying elements.
  2. 2. The modified glass frit according to claim 1, wherein the auxiliary modifying element comprises at least one of sodium element, potassium element, cesium element, zinc element, silver element, iron element, tungsten element, molybdenum element, titanium element, vanadium element, nickel element, copper element, cobalt element, zirconium element, manganese element, tantalum element, boron element, gallium element, indium element, aluminum element, germanium element, tin element, phosphorus element, arsenic element, selenium element, bismuth element, thallium element, alkaline earth element, and rare earth element.
  3. 3. The modified glass frit according to claim 1, wherein the molar percentage of the lead element is 20% -30%, the molar percentage of the tellurium element is 25% -35%, the molar percentage of the silicon element is 8% -25%, the molar percentage of the lithium element is 7% -20%, the molar percentage of the niobium element is 0.5% -5%, and the molar percentage of the auxiliary modifying element is 15% -25%.
  4. 4. The modified glass powder according to any one of claims 1 to 3, wherein the modified glass powder has a particle diameter D50 of 9 μm or less.
  5. 5. The modified glass powder according to claim 4, wherein the softening temperature of the modified glass powder is 240-350 ℃.
  6. 6. A method for producing the modified glass frit according to any one of claims 1 to 5, comprising: Uniformly mixing oxides and/or carbonates containing lead element, tellurium element, silicon element, lithium element, niobium element and auxiliary modification element to obtain a raw material mixture; sequentially carrying out melting treatment and cooling treatment on the raw material mixture to obtain glass solid; And grinding the glass solid to obtain the modified glass powder.
  7. 7. The method for producing a modified glass frit according to claim 6, wherein the temperature of the melting treatment is 1000 to 1400 ℃, and the time of the melting treatment is 30 to 80 minutes.
  8. 8. The method of producing a modified glass frit according to claim 6, wherein the grinding the glass solid comprises: and carrying out wet grinding on the glass solid by using zirconia balls and grinding solvent, wherein the mass ratio of the zirconia balls to the glass solid to the grinding solvent is (5-15) to 1 (0.5-2).
  9. 9. A battery backside electrode paste comprising: The modified glass powder disclosed by any one of claims 1-5, wherein the mass ratio of the conductive material to the organic carrier to the modified glass powder is (80-93): 7-20): 1-8.
  10. 10. A battery characterized in that it is a composite passivation contact battery comprising the battery back electrode paste of claim 9.
  11. 11. Use of the modified glass powder according to any one of claims 1 to 5 and/or the battery back electrode slurry according to claim 9 in a composite passivation contact battery laser assisted sintering process.

Description

Modified glass powder and preparation method thereof, battery back electrode slurry, battery and application Technical Field The application relates to the technical field of photovoltaic energy, in particular to modified glass powder, a preparation method thereof, battery back electrode slurry, a battery and application. Background In the manufacturing process of the tunneling oxide passivation contact solar cell, the electrode slurry is a core functional material. Wherein, the glass powder is used as an inorganic binding phase, and the performance plays a key role. The method is used for assisting the conductive silver powder and the silicon substrate to form firm ohmic contact in the sintering process, and guaranteeing long-term reliability of the final electrode in a subsequent severe environment. Currently, solar cell modules are subjected to comprehensive tests of water vapor, heat and an acidic environment during long-term service. Especially in the damp and hot aging test and practical application scenes, the packaging material, such as ethylene-vinyl acetate copolymer, can decompose to generate a small amount of acetic acid after damp and hot aging, and the acetic acid can directly contact the electrode grid line of the battery piece, so that the conditions of ion precipitation and structure corrosion in glass powder occur, and further the electrode performance is poor, the component is aged and failed in an accelerated manner, and the requirements of long-term stable use and industrial large-scale development of the photovoltaic component are difficult to meet. In the related art, a glass frit system having lead-tellurium-lithium-titanium oxide is designed for the front electrode of a crystalline silicon solar cell, but the acetic acid resistance of the system is not ideal. Moreover, the glass powder system is not suitable for the requirement of passivation contact solar cell back metallization of an N-type tunneling oxide layer, and stable and reliable ohmic contact is difficult to form. Disclosure of Invention The present application has been made in view of the above-described problems. According to an aspect of the present application, there is provided a modified glass frit, the raw material of which includes an oxide and/or carbonate containing lead element, tellurium element, silicon element, lithium element, niobium element, and an auxiliary modifying element for adjusting the physicochemical properties of the modified glass frit; the lead-containing alloy comprises 15% -40% of lead, 20% -45% of tellurium, 5% -35% of silicon, 5% -25% of lithium, more than 0 and less than or equal to 10% of niobium and 5% -25% of auxiliary modifying elements. Compared with the prior art, the raw materials of the modified glass powder provided by the application comprise oxides and/or carbonates of auxiliary modification elements containing lead elements, tellurium elements, silicon elements, lithium elements and niobium elements for adjusting the physical and chemical properties of the modified glass powder. Firstly, lead with the mole percentage of 15% -40% can reduce the softening temperature of glass, enhance the effect of the glass on the silicon nitride layer on the surface of the silicon wafer, and form good contact after assistance. The lithium element with the mole percentage of 5% -25% can obviously reduce the softening temperature of glass and the viscosity after melting, can provide electrons in the sintering process, helps silver ions to reduce, and creates conditions for forming stable conductive connection. Under the synergistic effect of the elements, the conductive material and the silicon substrate form firm ohmic contact so as to meet the requirement of passivation contact of the N-type tunneling oxide layer on the back surface of the solar cell. And secondly, the silicon element with the mole percentage of 5% -35% can construct a glass network skeleton, the self thermal expansion coefficient is low, the chemical property is stable, the silicon nitride layer on the surface of the silicon wafer can be prevented from being damaged excessively, the glass can be formed into a more stable form, the internal crystallization precipitation is reduced, the reactivity with acetic acid is reduced, and the acid resistance of the glass powder is fundamentally improved. The niobium with the mole percent of more than 0 and less than or equal to 10 percent is taken as a special modified component, the refractive index of the glass can be greatly improved with a small dosage, the forming effect of the glass is further optimized, and the acid resistance is additionally improved. Under the synergistic effect of the elements, acetic acid corrosion can be blocked, and ion leaching caused by the reaction of lead oxide and acetic acid is avoided. Moreover, the lower thermal expansion coefficient of the silicon element can avoid structural damage such as cracking, stripping and the like of the electrode caused by