High-specific-volume porous electrode foil and preparation method thereof
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A porous electrode, high-ratio technology, applied in circuits, capacitors, electrical components, etc., can solve the problems of unsatisfactory thermal treatment effect, limited application, difficult to form a stable molten structure, etc. The effect of reducing capacity and energy consumption
Pending Publication Date: 2022-05-17
浙江洪量新材科技有限公司
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[0006] Although the applicable formation voltage of the porous aluminum electrode foil obtained by the above preparation process has been improved, due to the unsatisfactory thermal treatment effect, it is difficult to form a bond between the high dielectric constant valve metal oxide and the aluminum powder and the aluminum substrate. The stable molten structure still limits its application in the field of high-pressure chemical formation
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Embodiment 1
[0062] In this embodiment, a method for preparing a high specific volume porous electrode foil includes the following steps:
[0063] (1) Mix aluminum powder, valve metal oxide powder, aluminum-silicon alloy powder, binder and solvent according to a preset mass ratio to obtain a mixed fluid;
[0064] Specifically, aluminum powder with an average particle size of 3 μm, titanium dioxide powder with an average particle size of 100 nm, aluminum-silicon alloy powder with an average particle size of 500 nm (silicon content is 11.7w t.%), polyvinylidene fluoride and N- Methylpyrrolidone is mixed to obtain a mixed fluid;
[0065] Among them, the mass ratio of titanium dioxide powder to aluminum powder is 1:20; the mass ratio of aluminum-silicon alloy powder to aluminum powder is 1:100, and the mass ratio of polyvinylidene fluoride to aluminum powder is 1:100; the solid content of the mixed fluid 60%;
[0066] (2) coating the mixed fluid on at least one side of the aluminum foil subs...
Embodiment 2-4
[0072] The preparation method of the high specific volume porous electrode foil of Examples 2-4 is basically the same as that of Example 1, except that in step (1), the mass ratio of aluminum-silicon alloy powder to aluminum powder is adjusted to 1:50, 1 :20, 1:10.
Embodiment 5-8
[0093] The preparation process of the porous electrode foil of Examples 5-8 is basically the same as that of Example 3, except that:
[0094] The average particle diameters of the aluminum-silicon alloy powders were adjusted to 0.1 μm, 0.3 μm, 1.0 μm, and 3.0 μm, respectively.
[0095] According to the SJ / T 11140-1997 standard, the porous electrode foils prepared in Examples 5-8 were tested for performance, and the test results are shown in Table 2.
[0096] Table 2
[0097]
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Abstract
The invention discloses a high specific volume porous electrode foil and a preparation method thereof, the porous electrode foil comprises an aluminum foil base material and a composite oxide film formed on at least one surface of the aluminum foil base material, and the composite oxide film comprises the following raw materials: aluminum powder, aluminum-silicon alloy powder and valve metal oxide powder with the dielectric constant greater than 6.5. As the eutectic temperature of the aluminum-silicon alloy is about 577 DEG C, when heat treatment exceeds the temperature point, the aluminum-silicon alloy begins to be converted into a molten state, so that welding of the valve metal oxide powder, the aluminum powder and the surface of the aluminum foil base material is promoted, and the valve metal oxide powder and the aluminum powder can be firmly dissolved on the aluminum foil base material; the structure of the porous electrode foil is more stable and efficient; after the sintered aluminum foil is subjected to anodic oxidation, the valve metal oxide powder can be doped in an aluminum oxide film layer generated by anodic oxidation, so that the epsilon / K value of a formed composite oxide film is remarkably increased, and finally the purpose of improving the specific volume of the porous electrode foil is achieved.
Description
technical field [0001] The invention belongs to the technical field of anode foil formation, and in particular relates to a high specific volume porous electrode foil and a preparation method thereof. Background technique [0002] Electrode foil is the key raw material of aluminum electrolytic capacitors, and aluminum electrolytic capacitors are one of the three major components that must be used in various electrical appliances, computers, communication equipment, and automation equipment. The quality of the electrode foil directly affects the service life of the capacitor, and the capacitor determines the service life of the electronic machine. The current development trend of the electronics industry is to develop towards the miniaturization of the whole machine, and capacitors occupy a large proportion of the space in electronic products, so reducing the volume of aluminum electrolytic capacitors is the key to the miniaturization of the whole machine, which puts forward ...
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