Conductive paste and preparation method and application thereof

By using a specific ratio of nickel alloy powder and silver powder in the conductive paste, combined with non-nickel elements and silver shell treatment, the problem of high oxidation of nickel metal powder is solved, the conductive performance is improved and the cost is reduced, and a high-performance electrode contact structure is formed.

CN120636896APending Publication Date: 2025-09-12JIANGSU RIYU PHOTOVOLTAIC NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202510974151.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-15
Publication Date
2025-09-12

AI Technical Summary

Technical Problem

In the prior art, when base metal nickel is used to replace part of metallic silver in the conductive paste, there are problems such as high oxidizability of nickel metal powder, strong reaction with glass, and difficulty in ensuring the stability of electrode resistivity and contact voltage, resulting in a decrease in conductive performance.

Method used

A specific ratio of nickel alloy powder and silver powder is combined with appropriate non-nickel elements α, β and γ to form a continuous conductive network, enhance the oxidation resistance and electronic conductivity of the nickel alloy powder, and ensure the continuity of the conductive network by coating the surface with a silver shell, thereby reducing the diffusion rate of nickel atoms and the interfacial chemical activity.

Benefits of technology

The electrical performance of the conductive paste is comparable to that of pure silver paste, significantly reducing costs. High-performance electrode contact structures are formed by sintering at high temperatures, thereby improving the electrical performance and reliability of solar cells.

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Abstract

The invention provides a conductive paste and a preparation method and application thereof, and the conductive paste comprises 84-91 wt% of a conductive phase, 0.8-5.2 wt% of a glass phase, 4-11 wt% of an organic carrier, 0.1-3 wt% of a dispersant, and the balance of a solvent. The conductive phase comprises 5-60 wt% of nickel alloy powder and 40-95 wt% of silver powder, the nickel alloy powder comprises at least one nickel alloy compound, the nickel alloy compound has a general formula of Ni-alpha-beta-gamma, alpha, beta and gamma are three non-nickel elements which are different from one another, and the sum of the alpha, the beta and the gamma is 100%. The elements alpha, beta and gamma are respectively selected from any one of transition metal, rare earth metal, alkaline earth metal and other non-nickel elements, the mass content of the nickel element is 10-99 wt%, and the sum of the mass content of the elements alpha, beta and gamma is 1-90 wt%. Nickel elements and non-nickel elements alpha, beta and gamma in a proper mass ratio are screened to form nickel alloy powder, so that the physical and chemical properties of the nickel alloy powder are improved, the ratio of the nickel alloy powder for replacing silver powder is increased, the electrical properties in the conductive slurry can be guaranteed, and the cost of the slurry is remarkably reduced.
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