CN107644739B - Working electrolyte of aluminum electrolytic capacitor for 550WV stroboscopic lamp and preparation method thereof - Google Patents
Working electrolyte of aluminum electrolytic capacitor for 550WV stroboscopic lamp and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an aluminum electrolytic capacitor working electrolyte for a 550WV strobe lamp and a preparation method thereof, wherein the electrolyte is prepared from the following raw materials in percentage by weight: 50-80% of a basic solvent; 5-15% of a second solvent; 5-20% of a third solvent; 2-20% of organic carboxylic acid; 2-20% of organic amine; 10-25% of organic ether; 0.1-1% of a passivating agent; 0.2-2% of p-nitrobenzol. The method comprises the steps of adding a second solvent and a third solvent into a first solvent + organic carboxylic acid + organic ether system; the first solvent is ethylene glycol, and the second solvent and the third solvent can effectively reduce the viscosity of the boron-free working electrolyte and effectively reduce ion collision, so that the boron-free system of ethylene glycol, organic carboxylic acid and organic ether can become the working electrolyte for the 550WV aluminum electrolytic capacitor, which is safe, stable, long in service life and excellent in stroboscopic characteristic.
Description
Technical Field
The invention relates to the field of chemical industry, in particular to a working electrolyte of an aluminum electrolytic capacitor for a 550WV strobe lamp and a preparation method thereof.
Background
The medium-high voltage aluminum electrolytic capacitor is widely applied to general electronic circuits, and mainly used for energy storage, filtering, coupling, oscillation, phase shifting, voltage reduction, integration, memory and the like. The working electrolyte of the electrolytic capacitor plays an extremely important role as the actual cathode of the electrolytic capacitor in the production of the electrolytic capacitor, which is responsible for whether the product can normally work for a long time and has the function of optimizing the electrical performance of the capacitor.
The traditional working electrolyte for the medium-high voltage aluminum electrolytic capacitor is a boric acid or borate + ethylene glycol system, wherein the boric acid or borate often plays a vital role in the working electrolyte for the medium-high voltage aluminum electrolytic capacitor. Boric acid or borate and ethylene glycol can generate esterification reaction, a small amount of water can be generated after the reaction, the small amount of water existing in the electrolyte is beneficial to repairing of an electrode foil oxidation film of a capacitor, the small amount of water is beneficial to dissolving of solute in the working electrolyte and improving of the conductivity of the working electrolyte, meanwhile, boric acid or borate and diethylene glycol or polyethylene glycol or polyvinyl alcohol can generate esterification reaction, the flashover voltage of the working electrolyte can be greatly improved after the reaction, and the working electrolyte with high flashover voltage is beneficial to safety and stability of a medium-high voltage aluminum electrolytic capacitor product.
However, boron and salts thereof are listed as banned substances in the high concern Substance (SVHC) list published by the eu chemical administration. The strobe lamp is used more and more widely in the world as necessary equipment in professional application fields such as safe cities, intelligent transportation, beauty treatment and medical treatment, and the service life of the strobe lamp is determined more and more as the strobe life of an aluminum electrolytic capacitor which is the most main energy storage and discharge element of the strobe lamp.
In conclusion, the existing market lacks an aluminum electrolytic capacitor working electrolyte for a 550WV strobe light, which can meet the regulations of the European Union chemical administration and meet the worldwide market demand, and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a high-quality working electrolyte with high-frequency flash property and a preparation method thereof, which do not contain boron and salt substances thereof, so that a 550WV stroboscopic aluminum electrolytic capacitor not only meets European Union standards, but also can meet the application of the 550WV aluminum electrolytic capacitor in certain specific occasions (stroboscopic lamps and beauty instruments).
In order to achieve the purpose, the invention provides an aluminum electrolytic capacitor working electrolyte for a 550WV strobe lamp, which is prepared from the following raw materials in percentage by weight:
the second solvent and the third solvent are used to reduce the viscosity of the working electrolyte.
In the above technical solution, further, the base solvent is ethylene glycol; the second solvent and the third solvent are several of dimethyl sulfoxide, N-dimethylformamide, methyl cyanide, acetone, 4-hydroxybutyric lactone, hexamethylphosphoric triamide, tetrahydrofuran and DMI.
In any of the above technical solutions, further, the organic carboxylic acid refers to one or a combination of more of adipic acid, suberic acid, azelaic acid hydrogen, sebacic acid, dodecanedioic acid, 1, 7-sebacic acid, 1, 6-dodecanedioic acid, 2, 7-dodecanedioic acid, 1, 10-hexadecanedioic acid, and 1, 12-octadecadioic acid.
In any of the above technical solutions, further, the organic ether is one or a combination of several of diethylene glycol ether, polyethylene glycol ether, polyglycerol ether, polymannuronol ether, and polysorbates.
In any of the above technical solutions, further, the passivating agent is ammonium hypophosphite.
In addition, the invention also provides a preparation method of the working electrolyte of the aluminum electrolytic capacitor for the 550WV strobe lamp, which comprises the following steps:
weighing a basic solvent and organic carboxylic acid, and sequentially adding the basic solvent and the organic carboxylic acid into a container; heating to a first temperature and stirring;
step two, dripping the weighed organic amine into the solution in the container by using a liquid transfer device, and stirring;
weighing organic ether, a passivator and p-nitrobenzol, and sequentially adding into a container; stirring;
step four, keeping the second temperature and stirring;
step five, cooling to a third temperature, and then adding a second solvent and a third solvent;
step six, keeping the fourth temperature and stirring;
step seven, naturally cooling to room temperature, and discharging;
wherein, the components are prepared according to the following weight percentage:
wherein the first temperature is lower than a fourth temperature, the fourth temperature is lower than a third temperature, and the third temperature is lower than the second temperature.
In the foregoing technical solution, further, the first step specifically includes:
weighing a basic solvent and organic carboxylic acid, adding the basic solvent and the organic carboxylic acid into a container, uniformly stirring and heating to a first temperature; the heating was stopped and then stirred until all dissolved.
In any of the above technical solutions, further, the first temperature is 50 ℃, the second temperature is 145 ℃, the third temperature is 90 ℃, and the fourth temperature is 80 ℃.
In any of the above technical solutions, further, in the fourth step, the second temperature is maintained for 180 minutes, and stirring is performed;
in the sixth step, the fourth temperature is maintained for 90 minutes, and stirring is carried out.
In any of the above technical solutions, further, the base solvent is ethylene glycol; the second solvent and the third solvent are several of dimethyl sulfoxide, N-dimethylformamide, methyl cyanide, acetone, 4-hydroxybutyric lactone, hexamethylphosphoric triamide, tetrahydrofuran and DMI; the organic carboxylic acid is one or a combination of more of adipic acid, suberic acid, azelaic acid hydrogen, sebacic acid, dodecanedioic acid, 1, 7-sebacic acid, 1, 6-dodecanedioic acid, 2, 7-dodecanedioic acid, 1, 10-hexadecanedioic acid and 1, 12-octadecanedioic acid; the organic ether is one or a combination of more of diethylene glycol ether, polyethylene glycol ether, polyglycerol ether, polymannan ether and polysorbate; the passivating agent is ammonium hypophosphite.
The invention has the beneficial effects that: according to the working electrolyte of the aluminum electrolytic capacitor for the 550WV strobe lamp, a second solvent and a third solvent are added into a first solvent, organic carboxylic acid and organic ether system; the first solvent is ethylene glycol, the second solvent and the third solvent are protic solvents or aprotic polar solvents, and the second solvent and the third solvent can effectively reduce the viscosity of the boron-free working electrolyte and effectively reduce ion collision, so that the boron-free system of ethylene glycol, organic carboxylic acid and organic ether can become a safe, stable, long-life and excellent-stroboscopic-characteristic working electrolyte for 550WV aluminum electrolytic capacitors.
Detailed Description
The invention provides a working electrolyte of an aluminum electrolytic capacitor for a 550WV strobe lamp, which is prepared from the following raw materials in percentage by weight:
wherein the base solvent is ethylene glycol; the second solvent and the third solvent are several of dimethyl sulfoxide, N-dimethylformamide, methyl cyanide, acetone, 4-hydroxybutyric lactone, hexamethylphosphoric triamide, tetrahydrofuran and DMI.
The organic ether is an organic sparking voltage improver, specifically is one or a combination of more of diethylene glycol ether, polyethylene glycol ether, polyglycerol ether, polymannuronate ether and polysorbate, and can effectively improve the sparking voltage of the boron-free working electrolyte.
Wherein the organic carboxylic acid is one or a combination of more of adipic acid, suberic acid, azelaic acid hydrogen, sebacic acid, dodecanedioic acid, 1, 7-sebacic acid, 1, 6-dodecanedioic acid, 2, 7-dodecanedioic acid, 1, 10-hexadecanedioic acid and 1, 12-octadecanedioic acid.
The passivating agent is ammonium hypophosphite, and is mainly used for repairing a phosphating film on the outer layer of an oxide film on the electrode foil to achieve the effect of inhibiting hydration, and the aluminum oxide film is insensitive to hydration reaction due to the complete existence of the phosphating film, so that the aluminum dielectric oxide film is protected.
Moreover, the organic carboxylic acid and the ammonium hypophosphite mainly repair an oxide film on an electrode foil when the medium-high voltage aluminum electrolytic capacitor is aged and works, and the complete existence of the oxide film improves the electrical characteristics of the 550WV aluminum electrolytic capacitor and the service life characteristics of products.
During the aging and working processes of the 550WV aluminum electrolytic capacitor, the oxide film defect on the electrode foil needs to be continuously repaired, hydrogen can be generated when the oxide film defect is repaired, the internal pressure of the electrolytic capacitor is increased due to the generation of the hydrogen, the electrolytic capacitor can explode when the internal pressure is serious, the p-nitrobenzol plays a role in absorbing the hydrogen in the process, and the organic amine is a regulator of the pH value of the working electrolyte.
Adding a second solvent and a third solvent into a first solvent + organic carboxylic acid + organic ether system; the first solvent is ethylene glycol, the second solvent and the third solvent are protic solvents or aprotic polar solvents, and the second solvent and the third solvent can effectively reduce the viscosity of the boron-free working electrolyte and effectively reduce ion collision, so that the boron-free system of ethylene glycol, organic carboxylic acid and organic ether can become a safe, stable, long-life and excellent-stroboscopic-characteristic working electrolyte for 550WV aluminum electrolytic capacitors.
Compared with the prior art, the working electrolyte of the aluminum electrolytic capacitor for the 550WV strobe lamp has the following advantages: according to a high concern Substance (SVHC) list published by the European Union chemical administration, on the premise of not using boron and salts thereof, an orthogonal test method is applied to screen solvents, solutes and additives, so that the stroboflash characteristic and the rapid charging and discharging capability of the working electrolyte are improved, and the problems of water generation and overheating during rapid charging and discharging caused by the esterification reaction of boron and salts thereof with ethylene glycol in the working process of the traditional aluminum electrolytic capacitor are solved, thereby obtaining the working electrolysis for the ultrahigh voltage (550WV) aluminum electrolytic capacitor with high stability, high quality and excellent stroboflash characteristic, wherein the service life of the working electrolysis capacitor is longer than that of the traditional working electrolyte electrolytic capacitor, and the stroboflash service performance of the aluminum electrolytic capacitor can be obviously improved.
The preparation method of the working electrolyte of the aluminum electrolytic capacitor for the 550WV strobe lamp comprises the following seven steps.
Step one, weighing 50-80% of ethylene glycol and 2-20% of organic carboxylic acid, adding into a container, uniformly stirring and heating to 50 ℃; stopping heating, and stirring until the mixture is completely dissolved;
secondly, slowly dripping 2-20% of the weighed organic amine into a liquid-transferring device and stirring the organic amine for 30 minutes at an accelerated speed;
weighing 10-25% of organic ether, then weighing 0.1-1% of ammonium hypophosphite and 0.2-2% of p-nitrobenzol by using a balance, sequentially adding into a container, and stirring;
step four, adding the component materials in sequence, keeping the temperature of 145 ℃ for 180 minutes and stirring;
step five, cooling to 90 ℃, and then cooling 5-15% of the second solvent and 5-20% of the third solvent;
step six, keeping the temperature at 80 ℃ for 90 minutes, and stirring;
and seventhly, naturally cooling to room temperature, and discharging.
Example 1
Weighing the following components in parts by weight: 50 parts of ethylene glycol, 6 parts of adipic acid, 8 parts of dimethyl sulfoxide, 13.5 parts of N, N-dimethylformamide, 11 parts of organic amine, 10 parts of diethylene glycol ether and 0.3 part of ammonium hypophosphite; 1.2 parts of p-nitrobenzyl alcohol.
The working electrolyte with good boron-free ultrahigh pressure (550WV) stroboscopic characteristic is prepared from the weighed raw materials:
step one, adding ethylene glycol and adipic acid into a container, uniformly stirring and heating to 50 ℃; stopping heating, and stirring until the mixture is completely dissolved;
secondly, slowly dripping organic amine into the solution-transferring device and stirring the solution for 30 minutes at an accelerated speed;
step three, adding the diglycol ether, the hypophosphorous acid and the p-nitrobenzyl alcohol into a container in sequence and stirring;
step four, adding the component materials in sequence, keeping the temperature of 145 ℃ for 180 minutes and stirring;
step five, cooling to 90 ℃, and then adding dimethyl sulfoxide and N, N-dimethylformamide;
step six, keeping the temperature at 80 ℃ for 90 minutes, and stirring;
and seventhly, naturally cooling to room temperature, and discharging.
Example 2
Weighing the following components in parts by weight: 58 parts of ethylene glycol, 3 parts of suberic acid, 6 parts of N, N-dimethylformamide, 9 parts of methyl cyanide, 7 parts of organic amine, 15 parts of polyethylene glycol ether and 0.5 part of ammonium hypophosphite; 1.5 parts of p-nitrobenzyl alcohol.
The working electrolyte with good boron-free ultrahigh pressure (550WV) stroboscopic characteristic is prepared from the weighed raw materials:
step one, adding ethylene glycol and suberic acid into a container, uniformly stirring and heating to 50 ℃; stopping heating, and stirring until the mixture is completely dissolved;
secondly, slowly dripping organic amine into the solution-transferring device and stirring the solution for 30 minutes at an accelerated speed;
step three, adding polyglycol ether, hypophosphorous acid and p-nitrobenzyl alcohol into a container in sequence and stirring;
step four, adding the component materials in sequence, keeping the temperature of 145 ℃ for 180 minutes and stirring;
step five, cooling to 90 ℃, and then adding N, N-dimethylformamide and methyl cyanide;
step six, keeping the temperature at 80 ℃ for 90 minutes, and stirring;
and seventhly, naturally cooling to room temperature, and discharging.
Example 3
Weighing the following components in parts by weight: 55 parts of ethylene glycol, 5 parts of azelaic acid hydrogen, 5 parts of acetone, 7 parts of 4-hydroxybutyric lactone, 6 parts of organic amine, 20 parts of polyglycerol ether and 0.8 part of ammonium hypophosphite; 1.2 parts of p-nitrobenzyl alcohol.
The working electrolyte with good boron-free ultrahigh pressure (550WV) stroboscopic characteristic is prepared from the weighed raw materials:
step one, adding ethylene glycol and azelaic acid hydrogen into a container, uniformly stirring and heating to 50 ℃; stopping heating, and stirring until the mixture is completely dissolved;
secondly, slowly dripping organic amine into the solution-transferring device and stirring the solution for 30 minutes at an accelerated speed;
step three, sequentially adding polyglycerol ether, hypophosphorous acid and p-nitrobenzyl alcohol into a container and stirring;
step four, adding the component materials in sequence, keeping the temperature of 145 ℃ for 180 minutes and stirring;
step five, cooling to 90 ℃, and then adding acetone and 4-hydroxy butyrate lactone;
step six, keeping the temperature at 80 ℃ for 90 minutes, and stirring;
and seventhly, naturally cooling to room temperature, and discharging.
Example 4
Weighing the following components in parts by weight: 50 parts of ethylene glycol, 3 parts of sebacic acid, 7 parts of acetone, 5 parts of 4-hydroxybutyric lactone, 8 parts of organic amine, 25 parts of polysorbate and 0.3 part of ammonium hypophosphite; 1.7 parts of p-nitrobenzyl alcohol.
The working electrolyte with good boron-free ultrahigh pressure (550WV) stroboscopic characteristic is prepared from the weighed raw materials:
step one, adding ethylene glycol and sebacic acid into a container, uniformly stirring and heating to 50 ℃; stopping heating, and stirring until the mixture is completely dissolved;
secondly, slowly dripping organic amine into the solution-transferring device and stirring the solution for 30 minutes at an accelerated speed;
sequentially adding polysorbate, hypophosphorous acid and p-nitrobenzol into a container and stirring;
step four, adding the component materials in sequence, keeping the temperature of 145 ℃ for 180 minutes and stirring;
step five, cooling to 90 ℃, and then adding acetone and 4-hydroxy butyrate lactone;
step six, keeping the temperature at 80 ℃ for 90 minutes, and stirring;
and seventhly, naturally cooling to room temperature, and discharging.
Example 5
Weighing the following components in parts by weight: 55 parts of ethylene glycol, 4 parts of dodecanedioic acid, 7 parts of hexamethyl phosphoric triamide, 7 parts of tetrahydrofuran, 8 parts of organic amine, 17 parts of polymannan ether and 0.5 part of ammonium hypophosphite; 1.5 parts of p-nitrobenzyl alcohol.
The working electrolyte with good boron-free ultrahigh pressure (550WV) stroboscopic characteristic is prepared from the weighed raw materials:
step one, adding ethylene glycol and dodecanedioic acid into a container, uniformly stirring and heating to 50 ℃; stopping heating, and stirring until the mixture is completely dissolved;
secondly, slowly dripping organic amine into the solution-transferring device and stirring the solution for 30 minutes at an accelerated speed;
sequentially adding the polymannuronate ether, the hypophosphorous acid and the p-nitrobenzyl alcohol into a container and stirring;
step four, adding the component materials in sequence, keeping the temperature of 145 ℃ for 180 minutes and stirring;
step five, cooling to 90 ℃, and then adding hexamethyl phosphoric triamide and tetrahydrofuran;
step six, keeping the temperature at 80 ℃ for 90 minutes, and stirring;
and seventhly, naturally cooling to room temperature, and discharging.
Example 6
Weighing the following components in parts by weight: 50 parts of ethylene glycol, 6 parts of 1, 7-decanedioic acid, 6 parts of hexamethyl phosphoric triamide, 12 parts of tetrahydrofuran, 14 parts of organic amine, 10 parts of polyglycol ether and 0.9 part of ammonium hypophosphite; 1.1 parts of p-nitrobenzyl alcohol.
The working electrolyte with good boron-free ultrahigh pressure (550WV) stroboscopic characteristic is prepared from the weighed raw materials:
step one, adding ethylene glycol and 1, 7-sebacic acid into a container, uniformly stirring and heating to 50 ℃; stopping heating, and stirring until the mixture is completely dissolved;
secondly, slowly dripping organic amine into the solution-transferring device and stirring the solution for 30 minutes at an accelerated speed;
step three, adding polyglycol ether, hypophosphorous acid and p-nitrobenzyl alcohol into a container in sequence and stirring;
step four, adding the component materials in sequence, keeping the temperature of 145 ℃ for 180 minutes and stirring;
step five, cooling to 90 ℃, and then adding hexamethyl phosphoric triamide and tetrahydrofuran;
step six, keeping the temperature at 80 ℃ for 90 minutes, and stirring;
and seventhly, naturally cooling to room temperature, and discharging.
According to the tests of the above embodiments, the characteristics of the working electrolyte of the aluminum electrolytic capacitor for the 550WV strobe light provided by the present application are as follows:
the conductivity of the working electrolyte is tested to be 0.6 +/-0.2 ms/cm at the temperature of 1.30 ℃;
the pH value of the working electrolyte is tested to be 6.5 +/-0.5 at the temperature of 2.30 ℃;
testing the lowest flashover voltage value of the working electrolyte at 3.80 ℃ to be not less than 580V;
the viscosity of the working electrolyte was measured to be 20 ± 2mpa.s at 4.80 degrees celsius.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (2)
1. The working electrolyte of the aluminum electrolytic capacitor for the 550WV strobe light is characterized by being prepared from the following raw materials in percentage by weight:
basic solvent: 50-80%;
a second solvent: 5-15%;
a third solvent: 5-20%;
organic carboxylic acid: 2-20%;
organic amine: 2-20%;
organic ether: 11-15%;
passivating agent: 0.1-1%;
p-nitrobenzyl alcohol: 0.2-2%;
the base solvent is ethylene glycol;
the second solvent is several of dimethyl sulfoxide, N-dimethylformamide, methyl cyanide, acetone, 4-hydroxy-butyrate lactone, hexamethyl phosphoric triamide and DMI;
the third solvent is tetrahydrofuran;
the second solvent and the third solvent are used for reducing the viscosity of the working electrolyte;
the organic carboxylic acid is one or a combination of more of adipic acid, suberic acid, azelaic acid, 1, 6-dodecanedioic acid, 2, 7-dodecanedioic acid, 1, 10-hexadecanedioic acid and 1, 12-octadecadioic acid;
the organic ether is one or a combination of more of diethylene glycol ether, polyethylene glycol ether, polyglycerol ether, polymannan ether and polysorbate; the passivating agent is ammonium hypophosphite.
2. A preparation method of working electrolyte of an aluminum electrolytic capacitor for a 550WV strobe light is characterized by comprising the following steps:
weighing a basic solvent and organic carboxylic acid, and sequentially adding the basic solvent and the organic carboxylic acid into a container; heating to 50 deg.C, and stirring;
step two, dripping the weighed organic amine into the solution in the container by using a liquid transfer device, and stirring;
weighing organic ether, a passivator and p-nitrobenzol, and sequentially adding into a container; stirring;
step four, keeping the temperature at 145 ℃, and stirring;
step five, cooling to 90 ℃, and then adding a second solvent and a third solvent;
step six, keeping the temperature at 80 ℃, and stirring;
step seven, naturally cooling to room temperature of 25 ℃, and discharging;
wherein, the components are prepared according to the following weight percentage:
basic solvent: 50-80%;
a second solvent: 5-15%;
a third solvent: 5-20%;
organic carboxylic acid: 2-20%;
organic amine: 2-20%;
organic ether: 11-15%;
0.2-2% of p-nitrobenzyl alcohol;
the first step specifically comprises: weighing a basic solvent and organic carboxylic acid, adding the basic solvent and the organic carboxylic acid into a container, uniformly stirring and heating to a first temperature; stopping heating, and stirring until the mixture is completely dissolved; keeping the second temperature for 180 minutes and stirring in the fourth step; in the sixth step, the fourth temperature is kept for 90 minutes, and stirring is carried out;
the base solvent is ethylene glycol;
the second solvent is several of dimethyl sulfoxide, N-dimethylformamide, methyl cyanide, acetone, 4-hydroxy-butyrate lactone, hexamethyl phosphoric triamide, tetrahydrofuran and DMI; the third solvent is tetrahydrofuran;
the organic carboxylic acid is one or a combination of more of adipic acid, suberic acid, nonane dihydro, 1, 6-dodecanedioic acid, 2, 7-dodecanedioic acid, 1, 10-hexadecanedioic acid and 1, 12-octadecadioic acid; the organic ether is one or a combination of more of diethylene glycol ether, polyethylene glycol ether, polyglycerol ether, polymannan ether and polysorbate;
the passivating agent is ammonium hypophosphite.
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| CN102280257A (en) * | 2011-05-31 | 2011-12-14 | 肇庆绿宝石电子有限公司 | Method for enhancing high/low temperature resistance of aluminium electrolytic capacitors |
| CN103632851A (en) * | 2012-08-27 | 2014-03-12 | 深圳市金元电子技术有限公司 | High-conductivity boron series-free working electrolyte and preparation method thereof |
| CN106783178A (en) * | 2016-11-30 | 2017-05-31 | 中南大学 | Working electrolyte for aluminium electrolytic capacitor of low temperature resistant and high pressure and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102280257A (en) * | 2011-05-31 | 2011-12-14 | 肇庆绿宝石电子有限公司 | Method for enhancing high/low temperature resistance of aluminium electrolytic capacitors |
| CN103632851A (en) * | 2012-08-27 | 2014-03-12 | 深圳市金元电子技术有限公司 | High-conductivity boron series-free working electrolyte and preparation method thereof |
| CN106783178A (en) * | 2016-11-30 | 2017-05-31 | 中南大学 | Working electrolyte for aluminium electrolytic capacitor of low temperature resistant and high pressure and preparation method thereof |
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