CN1477658A - Aluminium electrolytic capacitor dry type negative electrode foil making method - Google Patents

Abstract

The present invention relates to a preparation method of dry negative foil of aluminium electrolytic capacitor. It utilizes the method for making dry negative foil by adopting the process of physical gas deposition to continuously deposit proper conductive layer on the surface of aluminium foil material so as to obtain high-efficiency electronic conducting action and obtain stable surface property.

Description

Aluminium electrolytic capacitor dry type negative electrode foil making method

Technical field

The present invention relates to a kind of Aluminium Electrolytic Capacitor Negative Pole Foil Manufacturing Approach, particularly a kind of aluminium electrolytic capacitor dry type negative electrode foil making method.

Background technology

Low-impedance aluminium electrolytic capacitor product, be to reach a following big main flow on electric equipment uses at present, and this product reaches and can't break through selecting for use of material because be subject to the relatively poor disappearance of congenital stability of wet type electrochemistry galvanic corrosion paper tinsel at present, and its quality has reached bottleneck.

Moreover as shown in Figure 1, commonly using the cathode foil of aluminum electrolytic capacitor manufacture method is to announce No. 4 403923 patent case (call in the following text and quote case as proof) as Taiwan, and it mainly is to adopt etched mode, comprises following steps; (a) pre-treatment is to utilize the oxidizing acid aqueous solution to remove the pollutant on the former paper tinsel of aluminium surface; (b) etch processes is to utilize to contain aluminum ions etching solution, and to increase the etching effective area: (c) first section reprocessing is to utilize aqueous solution of nitric acid to clean up for the survivor ion of the etching solution of treatment fluid after with etch processes; (d) second section reprocessing is to utilize the aqueous solution such as phosphoric acid, sulfuric acid and acetic acid the impurity absorption thing in the etching hole to be disposed for treatment fluid again, and performs the preparation that grows oxide-film on Cathode Foil; And (e) the 3rd section reprocessing, be to utilize the aqueous solution such as ammonium adipate, ammonium hypophosphite to be treatment fluid, and cooperate and to apply DC power supply, make the oxide-film stabilized growth on the Cathode Foil, and become cathode foil for aluminum electrolytic capacitors.Yet still have many disappearances by the way: be to be because after the etching aluminium foil need come the former paper tinsel of aluminium carried out the chemical etching action of wet type with the corrosive liquid acid solution, then carry out the processing of stabilization again; One owing to formed relatively spent acid after must using acid solutions is in a large number handled and cost raising problem; Two because active high aluminium foil surface causes inevasible problem of oxidation because of acid solution, promptly makes electrical characteristic (quality) stability of aluminium foil surface be subjected to the restriction of material behavior and can't keep certain, makes quality to promote relatively.So the manufacture method of this cathode foil of aluminum electrolytic capacitor is real not satisfactory.

In addition, known techniques also has the relative manufacturing process of aluminium foil electrode.It is the dry-type and physical method that adopts physical vapour deposition (PVD) aluminium foil electrode, and its step is as follows: (a) pre-treatment is to utilize the oxidizing acid aqueous solution to remove the pollutant on the former paper tinsel of aluminium surface; (b) physical vapour deposition (PVD), deposition layer of metal film is in order to increase surface area, to generate dry type aluminium foil electrode finished product; But above-mentioned physical vapour deposition (PVD) aluminium foil electrode mode mainly is under the condition at thickness of electrode and characteristic, therefore, relatively is fit to use the negative material at battery, and is not suitable for aluminium electrolytic capacitor; And its surface characteristic is still unstable under atmospheric environment, and can't meet the electrode requirement of aluminium electrolytic capacitor.

Therefore, every shortcoming that this case inventor derives in view of above-mentioned traditional methods, be urgently to think to be improved innovation, and take great pains to attain one's goal through for many years and to concentrate on studies, finally successfully the negative foil making method of this part aluminium electrolytic capacitor dry type is finished in research and development, and its desire utilization is different from the electrochemical dry-type and physical method of wet type, carries out overlay coating at aluminium foil surface and handles, reaching the more high efficiency electrical conductivity effect and the stable surface characteristic of getting back, and be not subjected to the influence of external environment and change characteristic.

Summary of the invention

Technical problem to be solved by this invention is, above-mentioned deficiency at prior art, and a kind of more high efficiency electrical conductivity effect and stable surface characteristic of getting back of reaching is provided, and be not subjected to the influence of external environment and the aluminium electrolytic capacitor dry type negative electrode foil making method of change characteristic.

Above-mentioned technical problem of the present invention is realized by following technical scheme.

A kind of aluminium electrolytic capacitor dry type negative electrode foil making method is characterized in that: utilize the mode of physical vapour deposition (PVD), on suitable aluminum foil material surface, the continous way deposition plates conductive layer, and to promote the electrical characteristic stability of aluminium foil surface, its handling process is as follows:

(a) pre-treatment is to utilize the oxidizing acid aqueous solution to remove the former paper tinsel grease of aluminium surface to make alligatoring:

(b) the ground floor vapour deposition is handled, and is the titanium conductive layer that forms a layer thickness 0.1 μ m-1.0 μ m on the former paper tinsel of this aluminium with the control deposition rate, to increase effective area:

(c) second layer vapour deposition is handled, and is to form the titanium nitride (TiN) of a layer thickness 0.01 μ m-0.5 μ m with the control deposition rate on this titanium, and becomes aluminium electrolytic capacitor anode foil material.

Except that above-mentioned necessary technology system, in specific implementation process, also can replenish following technology contents:

Wherein this conductive layer has a plurality of holes.

The present invention utilizes the dry-type and physical method to carry out overlay coating at aluminium foil surface to handle, to reach more high efficiency electrical conductivity effect, and the electrical surface characteristic of getting back stable, and be not subjected to the influence of external environment and change characteristic, further promote the quality of aluminium electrolytic capacitor.

The present invention makes the total capacitance of the twice at least of effective lifting capacitor reducing the suitable anode foil material thickness of aluminium electrolytic capacitor, reaching the anode foil material surface area that improves this aluminium electrolytic capacitor.

Aluminium electrolytic capacitor dry type negative electrode foil making method provided by the present invention is compared with other located by prior art, has more following advantage:

1, can promote the electric stability of capacitor surface.

2, can improve the static capacity of twice at least.

3, can effectively improve the surface electronic conduction velocity.

4, value on tool business circles and the industrial circle.

For feature of the present invention and effect thereof are had further understanding, enumerate specific embodiment now, and be described with reference to the accompanying drawings as follows:

Description of drawings

Fig. 1 is a schematic flow sheet of commonly using the cathode foil of aluminum electrolytic capacitor manufacture method.

Fig. 2 is the schematic flow sheet of the dry type manufacture method of cell negative electrode material.

Fig. 3 is the sectional drawing in the front of aluminium electrolytic capacitor.

Fig. 4 is the schematic flow sheet of negative electrode foil making method of the present invention.

Enclosing 5 is processing procedure profiles of anode foil of the present invention.

Embodiment

As shown in Figure 3, aluminium electrolytic capacitor possesses capacitor element of being taken in the casing 31 and the lead 2 that is connected in this capacitor element 1, and is sealed element 4 with what the peristome of casing 3 sealed the examinee's name on an exam-paper so as to prevent fraudulence.Capacitor element 1 is separator and backrush are arranged and to form by making between cathode foil and anode foil to be situated between; This lead 2 comprises the couple of conductor 2 of each other end that is connected in anode paillon foil and negative electrode paillon foil, and this connects respectively lead 2 and seals the through hole of element 4 and be drawn out from the outside of casing 3; Wherein the anode foil material in the aluminium electrolytic capacitor is generally electrolyte, yet the anode foil function of aluminium electrolytic capacitor mainly is to be responsible for conduction electron, wherein:

1/CT＝1/C+ + 1/C-

CT: aluminium electrolytic capacitor total capacitance;

C+: cathode foil material capacitance;

C-: anode foil material capacitance;

C∝A/d

C: capacitance;

A: the area of conductive layer

D; The thickness of dielectric layer

Its electrical characteristic requires as follows:

High static capacity (C):--the static capacity of-wet type electrochemical method manufacturing at present, use specifications roughly from 90 μ f/cm according to difference ²-450 μ f/cm ²

Electrolyte compatibility height:---fully stable with the interface energy of the electrolyte solution of EG or GBL series, and effectively improve the speed of surface electronic conduction;

High electric stability:--the anode foil material of-wet type electrochemical method manufacturing at present, because aluminum metallic foil is to the oxygen activity height, make the surface very easily produce layer oxide film, and, make that the electrical characteristic of capacitor is stable therefore and inadequately because of the difference of environment has different oxide-film states:

Low thickness (d):---because anode foil mainly as the function of electrical conductivity, meets the requirements of electrical characteristic and more than the mechanical property value, thickness is lowly more can reach compact requirement more;

As Fig. 4, shown in Figure 5, can reach the aluminium electrolytic capacitor dry type negative electrode foil making method of foregoing invention purpose, be different from and utilize the electrochemical manufacturing method thereof of wet type at present, but utilize the mode of physical vapor deposition (PVD), on the former foil material of suitable aluminium surface, the continous way deposition plates suitable conductive layer, make the optimal selection that becomes negative material, the surface conductance layer is not only than the electrical conductivity height of present commercial articles for use, and don't influence the mechanical performance of the former paper tinsel of ground aluminium, more help the coiling processing procedure of capacitor, its handling process is as follows:

(a) pre-treatment 41, are to utilize the oxidizing acid aqueous solution to remove the former paper tinsel 51 of aluminium (thickness: 15 μ m-80 μ m, purity: the 99.0%-99.9%) alligatoring on grease surface;

(b) the ground floor vapour deposition handles 42, be that to form the thickness that one deck has a plurality of holes 521 with the control deposition rate on the former paper tinsel 51 of this aluminium be the conductive layer of 0.1 μ m-1.0 μ m titanium 52 (Ti), with its surface area of effective increase, and suitably electrical conductivity is come out;

(c) second layer vapour deposition handles 43, is to form a layer thickness 0.01 μ m-0.5 μ m titanium nitride 53 (TiN) with the control deposition rate on this titanium, produces oxidation to avoid anode foil) IA and become aluminium electrolytic capacitor with anode foil material 5;

Negative electrode foil making method by above-mentioned dry type, carry out overlay coating handles on the former paper tinsel of aluminium 51 surfaces, can avoid using a large amount of acid solutions problem of oxidation afterwards, owing to can not produce oxidation yet, make electrical characteristic (quality) stability on the former paper tinsel of aluminium 51 surfaces promote relatively (be C--can not be subjected to the influence of external environment and change characteristic), and owing to utilize the mode of physical vapor deposition (PVD), also can be on the former paper tinsel of suitable aluminium 51 dielectric layer surfaces, the continous way deposition plates the conductive layer with a plurality of holes 521, simultaneously can increase its effective surface area, use the raising static capacity.

The above only is a preferred embodiment of the present invention, and when not limiting scope of the invention process with this, promptly the equalization of being done according to the present patent application claim generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.

In sum, the present invention has reached the effect that the institute desire is promoted really, and this technological thought tool be invention highly, and the mistake of present oil hydraulic system is forgone fully, does not think and invents except having industry applications and having other people; Moreover open and reached its effect before the present patent application, the progressive of its tool, invention show the application important document that has met patent of invention, propose patent application in accordance with the law.

Claims (2)

1, a kind of aluminium electrolytic capacitor dry type negative electrode foil making method, it is characterized in that: utilize the mode of physical vapour deposition (PVD), on suitable aluminum foil material surface, the continous way deposition plates conductive layer, to promote the electrical characteristic stability of aluminium foil surface, its handling process is as follows:

(a) pre-treatment is to utilize the oxidizing acid aqueous solution to remove the former paper tinsel grease of aluminium surface to make alligatoring:

(b) the ground floor vapour deposition is handled, and is the titanium conductive layer that forms a layer thickness 0.1 μ m-1.0 μ m on the former paper tinsel of this aluminium with the control deposition rate, to increase effective area:

(c) second layer vapour deposition is handled, and is to form the titanium nitride (TiN) of a layer thickness 0.01 μ m-0.5 μ m with the control deposition rate on this titanium, and becomes aluminium electrolytic capacitor anode foil material.

2, a kind of aluminium electrolytic capacitor dry type negative electrode foil making method according to claim 1, it is characterized in that: wherein this conductive layer has a plurality of holes.

Images