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CN-122011838-A - Composite particle-free conductive ink and preparation method and application thereof

CN122011838ACN 122011838 ACN122011838 ACN 122011838ACN-122011838-A

Abstract

The invention relates to a composite particle-free conductive ink and a preparation method and application thereof, and is characterized in that a conductive composition comprises, by mass, 5-50% of a composite metal precursor, 20-50% of a complexing agent, 0-10% of a reducing agent, 0-5% of an organic additive and the balance of a reducing agent. The particle-free conductive ink is prepared by the composite metal precursor, and the composite particle-free conductive ink is applied to the pole piece of the MLPC capacitor to heat up in a staged manner so that the silver simple substance of the conductive coating is tightly combined to enhance the compactness of the conductive film, the defects that holes appear in the silver layer on the surface of the pole piece and the surface of the silver layer is discontinuous are overcome, the resistivity between the pole pieces is effectively reduced, the conductive film has better conductivity, and the preparation of the MLPC aluminum electrolytic capacitor with ultra-low ESR is realized.

Inventors

  • Li chenxing
  • LIN JINCUN
  • LIN YUANYU
  • LIN YIZHU
  • YANG ZHENYI
  • WU XIUWEN

Assignees

  • 丰宾电子科技股份有限公司
  • 深圳丰宾电子半导体科技有限公司

Dates

Publication Date
20260512
Application Date
20260213

Claims (10)

  1. 1. A composite particle-free conductive ink is characterized in that a conductive composition comprises, by mass, 5-50% of a metal precursor, 20-50% of a complexing agent, 0-10% of a reducing agent, 0-5% of an organic additive and the balance of a reducing agent.
  2. 2. A composite particle-free conductive ink as claimed in claim 1 wherein the composite metal precursor is one or more of an oxide of silver, a halide of silver, and an oxyacid salt of silver.
  3. 3. A composite particle conductive ink according to claim 2, wherein the silver halide is selected from one or more of silver fluoride, silver chloride, silver bromide and silver iodide, the oxyacid salt of silver is selected from one or more of silver nitrate, silver sulfate, silver acetate, silver phosphate, silver carbonate, silver chlorate and silver citrate, and the oxide of silver is selected from one or two of silver oxide and silver peroxide.
  4. 4. The composite particle-free conductive ink of claim 1, wherein the complexing agent is an amine complexing agent selected from the group consisting of ammonia, methylamine, ethylamine, propylamine, butylamine, hexylamine, isopropylamine, tetrahydroxypropylethylenediamine, isopropanolamine, monoethanolamine, diethanolamine, triethanolamine, 1, 2-diaminopropane, ammonium tartrate, and polyaniline.
  5. 5. A composite particle-free conductive ink as claimed in claim 1 wherein the reducing agent is selected from the group consisting of formic acid, acetic acid, propionic acid, acetic acid, carbonic acid, benzoic acid, lactic acid, polyethylene diamine, glutamic acid, alanine, 4-methyldiamide, citric acid.
  6. 6. The composite particle-free conductive ink of claim 1, wherein the organic additive comprises at least one of a thickener, a surface additive, a film former, a dispersant, a leveling agent, and a defoamer.
  7. 7. A composite particle-free conductive ink as claimed in claim 1 wherein the solvent comprises one or more of deionized water, ethanol, ethylene glycol, methanol, isopropanol, n-butanol, diethylene glycol, xylene or gamma butyrolactone.
  8. 8. The composite particle-free conductive ink of claim 1, wherein the conductive composition has a viscosity of 5-50000 cP and a solids content of 10% -60%.
  9. 9. The method for preparing the composite particle-free conductive ink according to any one of claims 1 to 8, comprising the following steps: Step S1, preparing a metal precursor, namely preparing different silver precursors by taking oxo acid salt of silver as a substrate and reacting with different alkaline salt solutions; step S2, centrifuging, washing and drying the prepared silver precursor to obtain silver precursor powder; step S3, mixing at least two silver precursors, adding the silver precursors into a mixed solution of an amine complexing agent, a solvent and a reducing agent, stirring until the silver precursors are completely dissolved, filtering the mixed solution, adding a proper amount of additives to adjust the viscosity and the surface tension of the mixed solution, and stirring until the mixed solution is completely uniform to obtain conductive ink; and S4, coating the conductive ink obtained in the step S3 on the negative electrode of the lamination unit, and carrying out stepwise heating and curing to obtain the conductive silver film.
  10. 10. The method according to claim 1 to 8, wherein the conductive material is used in an MLPC aluminum electrolytic capacitor.

Description

Composite particle-free conductive ink and preparation method and application thereof Technical Field The invention relates to composite particle-free conductive ink, a preparation method thereof and application thereof in an MLPC capacitor, belongs to the technical field of capacitors, and particularly relates to composite particle-free conductive ink, and a preparation method and application thereof. Background Along with the rapid development and updating of aluminum electrolytic capacitors and the miniaturization and refinement of the demands for electronic products, the demands for capacitors are also aligned with the trends of small volume, high capacity and low resistance. However, as the number of stacked layers of the electrode unit of the MLPC aluminum electrolytic capacitor increases, the vertical resistance becomes large, the stacking pressure increases, the leakage current increases, and the short-circuit risk increases sharply. At present, the conductive silver paste or nano-particle conductive ink containing resin is adopted to fill or connect the pole pieces, the conductive silver paste can reduce the thickness of the laminated unit to a certain extent, the effective conductive part is increased, and the vertical resistance is reduced. In addition, the nano particle conductive ink stabilizes the metal particles at the nano level, the metal content is higher, more dispersing agent is needed to be added to prevent the metal particles from agglomerating and settling, the resistivity is also increased due to the dispersing agent, and the sintering temperature is also increased along with the boiling point of the dispersing agent. At present, the pole piece negative electrode of the MLPC aluminum electrolytic capacitor is distributed into a conductive polymer layer, a conductive graphite layer and a silver layer from inside to outside, the adjacent negative pole pieces are connected by conductive silver paste, the conductive silver paste is resin as a bonding phase, shrinkage occurs during solidification, holes appear on the surface of the pole pieces, the surface of the silver layer is discontinuous, the resin is used as an insulating layer, the molecular weight and the duty ratio of a hard chain segment of the resin can influence the insulativity, and the vertical resistance between stacked units can also be influenced during stacking. How to improve the continuity of the silver layer and increase the conductive path between the stacked units is one of the breakthrough directions for making MLPC with ultra-low ESR. Disclosure of Invention In order to overcome the technical defects existing in the prior art, the invention provides the composite particle-free conductive ink, the preparation method and the application thereof, and the particle-free conductive ink is prepared by the composite metal precursor, and the composite particle-free conductive ink is applied to the pole piece of the MLPC capacitor to heat up in a staged manner so that the silver simple substance of the conductive coating is tightly combined to enhance the compactness of the conductive film, the defects that holes appear on the silver layer on the surface of the pole piece and the surface of the silver layer are discontinuous are overcome, the resistivity between the pole pieces is effectively reduced, the conductive film has better conductivity, and the preparation of the MLPC aluminum electrolytic capacitor with ultralow ESR is realized. The invention solves the technical problems by adopting the following technical scheme: A composite particle-free conductive ink and a preparation method and application thereof are characterized in that the conductive composition comprises 5-50% of a composite metal precursor, 20-50% of a complexing agent, 0-10% of a reducing agent, 0-5% of an organic additive and the balance of a reducing agent according to mass percentage. Preferably, the composite metal precursor is one or more of silver oxide, silver halide and silver oxysalt. Preferably, the halide of silver is selected from one or more of silver fluoride, silver chloride, silver bromide and silver iodide, the oxysalt of silver is selected from one or more of silver nitrate, silver sulfate, silver acetate, silver phosphate, silver carbonate, silver chlorate and silver citrate, and the oxide of silver is selected from one or two of silver oxide and silver peroxide. Preferably, the complexing agent is an amine complexing agent selected from one or more of ammonia water, methylamine, ethylamine, propylamine, butylamine, hexylamine, isopropylamine, tetrahydroxypropyl ethylenediamine, isopropanolamine, monoethanolamine, diethanolamine, triethanolamine, 1, 2-diaminopropane, ammonium tartrate, and polyaniline. Preferably, the reducing agent is selected from one or more of formic acid, acetic acid, propionic acid, acetic acid, carbonic acid, benzoic acid, lactic acid, polyethylene diamine, glutamic acid, alanine, 4-methyldiamide, citric acid