Modified nickel powder, preparation method thereof, conductive silver-nickel paste and topcon solar cell

Modified nickel powder was prepared by demagnetizing and surface coating nickel powder, which solved the problems of nickel powder oxidation and magnetoagglomeration, improved the dispersibility and stability of nickel powder in silver paste system, achieved synergistic performance of silver and nickel components, reduced costs and ensured the long-term reliability of the electrode.

CN121339425BActive Publication Date: 2026-03-27SHANGHAI SILVER PASTE SCI & TECH CO LTD
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Patent Information

Application Number
CN202511930571.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-19
Publication Date
2026-03-27
Estimated Expiration
2045-12-19

AI Technical Summary

Technical Problem

Nickel powder is prone to oxidation during sintering, which leads to an increase in electrode grid resistance and magnetoagglomeration, affecting battery conversion efficiency and production yield. Existing silver-nickel paste formulation systems lack synergy and are difficult to balance low cost, excellent conductivity and long-term reliability.

Method used

Modified nickel powder is prepared by demagnetizing and coating nickel powder. The demagnetizing process includes AC demagnetization, drying pretreatment and inorganic coating. The coating layer is a nitride, forming a core-shell structure, which reduces remanence and enhances dispersibility and oxidation resistance.

Benefits of technology

It significantly improves the dispersion uniformity and storage stability of nickel powder in silver paste system, reduces interfacial contact resistance, ensures stable electrode performance during the service life of photovoltaic modules, achieves low cost, high conductivity and high adhesion, and meets the long-term reliability requirements of high-efficiency photovoltaic cells.

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Abstract

The application discloses a modified nickel powder and a preparation method thereof, a conductive silver-nickel paste, and a TOPCon solar cell. The preparation method of the modified nickel powder comprises the following steps: demagnetizing treatment on the nickel powder; and surface coating treatment on the demagnetized nickel powder to obtain the modified nickel powder. The raw material composition of the conductive silver-nickel paste comprises, in percentage by weight, 60-90 wt% of silver powder, 2-30 wt% of the modified nickel powder, 1.2-4.5 wt% of glass powder, 1-5 wt% of organic resin, 1-10 wt% of organic solvent, 0.1-0.5 wt% of silicone oil, and 0.1-1 wt% of an additive. The application solves the problems of oxidation and magnetic agglomeration of the traditional nickel powder, improves the dispersion stability of the paste, reduces the contact resistance and the paste cost, and guarantees the conductivity and the adhesion.
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