Preparation method of ultralow-temperature-resistant high-voltage aluminum electrolytic capacitor electrolyte

Abstract

The invention relates to a preparation method of an ultralow-temperature-resistant high-voltage aluminum electrolytic capacitor electrolyte, which is characterized in that the ultralow-temperature-resistant high-voltage electrolyte comprises the following components: 60-80% of a main solvent; 5%-10% of an auxiliary solvent; 3%-10% of solute; 0.5%-5% of an additive; wherein the additives comprise a flash fire improver, a hydrogen elimination agent, a stabilizer and a PH regulator; the solute is long-carbon-chain multi-branched-chain multi-element organic carboxylic acid ammonium salts, and the main structural formula of the solute is as follows: # imgabs0 #, wherein R1 and R2 are C1-4 alkyl groups, and R3 and R4 are respectively and independently selected from one or two of H, C1-6 alkyl groups and C2-8 alkenyl groups; x, y and z are independently selected from numbers from 1 to 8. The long-carbon-chain multi-branched-chain multi-element organic carboxylic acid ammonium salt is used as a main solute and is combined with the auxiliary solvent with strong polarity and low freezing point, so that the ionization degree is improved, the intermolecular acting force is reduced, the low-temperature resistance of the high-voltage electrolyte is greatly improved, and the problems of large capacity fading and large impedance of a high-voltage aluminum capacitor at an ultralow temperature are solved.

Description

Technical Field

[0001] The invention belongs to the field of capacitors, and in particular to a method for preparing an ultra-low temperature resistant high-voltage aluminum electrolytic capacitor electrolyte. Background Art

[0002] Aluminum electrolytic capacitors are one of the most widely used components on circuit boards in electronic products. In recent years, with the increasing application of various electronic products and equipment, especially in the extremely cold northern regions, higher requirements have been put forward for the low temperature resistance of outdoor electrical products. For example, the outdoor unit of variable frequency air conditioner, outdoor charging pile and other electrical appliances that work in ultra-low temperature environment for a long time will have a significant attenuation of capacitor capacity and a sharp increase in ESR, which will cause the capacitor filtering effect to seriously decrease and fail to work properly when the whole machine is turned on and running, and the equipment startup time will be extended or even unable to start. This requires this type of aluminum electrolytic capacitor to have better ultra-low temperature resistance, and the core technology is the electrolyte of aluminum capacitors. The applicable temperature environment of ordinary high-voltage aluminum capacitor electrolyte is -20℃~105℃, and the higher requirements will be -40℃. However, there are still technical bottlenecks for high-voltage aluminum electrolytic capacitors that can withstand temperatures below -40℃, because the liquid electrolyte of aluminum capacitors below -40℃ is very easy to solidify, resulting in a sharp drop in electrolyte conductivity and a sharp increase in capacitor impedance, making the parameters of the capacitor completely unable to meet its characteristic requirements, resulting in failure to work properly.

[0003] The common way to solve the low-temperature characteristics of aluminum capacitor electrolytes in the industry is to use a GBL electrolyte system that can withstand ultra-low temperatures. However, the electrolytes of this type of system generally have insufficient voltage resistance and cannot meet the requirements of high operating voltages. The solution to low-temperature resistance of high-voltage capacitors is mainly based on the solvent of the electrolyte. Generally, auxiliary solvents with lower freezing points are added, mostly ethers, to lower the freezing point of the overall electrolyte, thereby ensuring that the rate of change of the characteristics of the electrolyte is low at low temperatures. However, the solutes commonly used in high-voltage electrolytes are long-chain organic matter, which is not as soluble as low-voltage short-chain small molecule organic matter. Therefore, the solubility of common low-freezing-point solvents for solutes is not as good as the main solvent ethylene glycol. After addition, it will affect the solubility of the electrolyte solute. In ultra-low temperature environments, the electrolyte is prone to precipitate crystals, which affects the capacitance characteristics and functionality. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for preparing an ultra-low temperature resistant high-voltage aluminum electrolytic capacitor electrolyte. The method adopts a long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt with good solubility as the main solute of the electrolyte and combines it with an auxiliary solvent with strong polarity and low freezing point. The combination of the two can improve the degree of ionization, increase the conductivity of the electrolyte, reduce the intermolecular force, and greatly improve the low temperature resistance of the high-voltage electrolyte, thereby solving the problem of large capacity attenuation and large impedance of high-voltage aluminum capacitors at ultra-low temperatures.

[0005] The present invention solves the technical problem by adopting the following technical solutions: A method for preparing an ultra-low temperature resistant high-voltage aluminum electrolytic capacitor electrolyte, characterized in that the ultra-low temperature resistant high-voltage electrolyte comprises: 60% to 80% of a main solvent; 5% to 10% of an auxiliary solvent; 3% to 10% of a solute; and 0.5% to 5% of an additive; wherein the additive comprises a flash enhancer, a hydrogen remover, a stabilizer, and a pH regulator; and the solute is a polybasic organic carboxylic acid ammonium salt with a long carbon chain and multiple branches, and its main structural formula is as follows:

[0006] Wherein: R1 and R2 are C1-4 alkyl, R3 and R4 are independently selected from one or two of H, C1-6 alkyl, and C2-8 alkenyl; x, y, and z are independently selected from numbers in the range of 1-8.

[0007] Furthermore, the main solvent is ethylene glycol; and the auxiliary solvent is an organic substance having a freezing point lower than that of the main solvent.

[0008] Furthermore, the auxiliary solvent is selected from one or two of diethylene glycol monobutyl ether, diethylene glycol, propylene glycol, propylene carbonate, diethylene glycol dibutyl ether, ethylene glycol ethyl ether acetate, 3-methoxybutanol, 1,2-propylene glycol carbonate, and ethylene glycol methyl ether.

[0009] Furthermore, the flash enhancer is selected from one or two or more of ethylene glycol, polyvinyl alcohol, polypropylene alcohol, modified nano-silica sol, high molecular weight polymer organic carboxylate, and polyester.

[0010] Furthermore, the hydrogen remover is selected from one or two or more of p-nitrophenol, p-nitrobenzyl alcohol, p-benzoquinone, o-nitrobenzyl alcohol, o-nitroanisole, p-nitrobenzyl alcohol, and p-nitrobenzoic acid.

[0011] Furthermore, the stabilizer is selected from two or more of ethylenediaminetetraethylamine, methyl phosphate, butyl phosphate, phosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, sorbitol, glucitol, boric acid, and ammonium pentaborate.

[0012] Furthermore, the preparation method of the electrolyte comprises the following steps: SI: The main solvent and the auxiliary solvent are uniformly mixed in proportion and heated to 50 to 70 ℃ to obtain a mixture A; S2: Add the solute and the flash enhancer to the mixture A obtained in SI, and heat to 120-130 ℃, and stir at a constant temperature for 40-60min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80° C., a dehydrogenating agent and a stabilizer are added, and the mixture is continuously stirred and cooled to room temperature to obtain a high-voltage electrolyte resistant to ultra-low temperature.

[0013] The advantages and positive effects of the present invention are:

[0014] 1. The present invention discloses a method for preparing an ultra-low temperature resistant high-voltage aluminum electrolytic capacitor electrolyte, which uses a long carbon chain polybasic organic carboxylic acid ammonium salt with a special structure and a multi-branched structure as the main solute of the electrolyte. The solute has good solubility due to the multi-branched structure; the polybasic carboxylic acid structure can greatly improve the degree of ionization and increase the conductivity of the electrolyte. At the same time, a substance with a strong polarity and a low freezing point is used as an auxiliary solvent, which greatly reduces the intermolecular force of the solvent and improves the low temperature resistance of the electrolyte. The combined effect of the two factors can greatly improve the ultra-low temperature performance of the high-voltage electrolyte, overcome the defects of the existing high-voltage electrolyte in low temperature conditions, such as reduced solubility, extremely small capacity extraction rate, and large impedance, so that the high-voltage electrolyte can maintain good liquid performance under ultra-low temperature conditions, thereby solving the problem of large capacity attenuation and high impedance of high-voltage aluminum capacitors under ultra-low temperatures.

[0015] 2. The ultra-low temperature resistant high-pressure electrolyte of the present invention has no crystal precipitation at 55°C and a small change in resistivity. The high-pressure ultra-low temperature electrolyte is applied to aluminum electrolytic capacitors under room temperature conditions. The aluminum electrolytic capacitors have excellent performance and can be used normally between 55°C and 105°C, while being able to maintain more than 80% of the capacitance. In particular, the product has a small impedance and low power consumption under ultra-low temperature environments, which is far ahead of the current level of similar products in the industry and has a high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 It is a flow chart of the preparation of the electrolyte of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] A method for preparing an ultra-low temperature resistant high-voltage aluminum electrolytic capacitor electrolyte, characterized in that the ultra-low temperature resistant high-voltage electrolyte comprises: 60% to 80% of a main solvent; 5% to 10% of an auxiliary solvent; 3% to 10% of a solute; and 0.5% to 5% of an additive; wherein the additive comprises a flash enhancer, a hydrogen remover, a stabilizer, and a pH regulator; and the solute is a polybasic organic carboxylic acid ammonium salt with a long carbon chain and multiple branches, and its main structural formula is as follows:

[0020] Wherein: R1 and R2 are C1-4 alkyl, R3 and R4 are independently selected from one or two of H, C1-6 alkyl, and C2-8 alkenyl; x, y, and z are independently selected from numbers in the range of 1-8.

[0021] The solute is a specific long carbon chain organic polycarboxylic acid ammonium salt containing a multi-branched structure. Compared with the same series of products, it has a higher solubility in the electrolyte of high-voltage aluminum electrolytic capacitors. Because of its multi-branched structure, the solute has good solubility; the polycarboxylic acid structure can greatly improve the degree of ionization of the electrolyte and increase the conductivity of the electrolyte.

[0022] The long carbon chain multi-branched structure makes the solubility of this type of ammonium carboxylate salt in ethylene glycol solvent significantly improved, and still has a high solubility in low temperature environment. This improvement helps to form a more uniform electrolyte system, reduce precipitation and stratification, and thus ensure the stability of the electrolysis process. Long carbon chain multi-branched polybasic organic carboxylate ammonium salts can form more ion pairs in the electrolyte, thereby improving the conductivity of the electrolyte. The improvement in conductivity helps to accelerate the electrolysis reaction rate and improve the electrolysis efficiency. Due to the improvement in conductivity and the uniformity of the electrolyte system, the electrolyte using this type of ammonium carboxylate salt usually has a lower impedance, which helps to reduce energy loss during the electrolysis process. It plays a role in reducing impedance in low temperature environments.

[0023] The main solvent is ethylene glycol. In some embodiments, the main solvent further comprises a mixture of one or more of polyethylene oxide, N,N-dimethylformamide, methyl formate MF, methyl acetate MA, and ethyl acetate EA.

[0024] The main solvent provides ionic conductivity. The main solvent in the electrolyte can dissolve the electrolyte and form mobile ions in it. These ions can move freely in the solvent, thereby achieving current conduction. The choice of solvent has an important influence on the ionic conductivity of the electrolyte.

[0025] The main solvent can form a stable second layer of electricity on the surface of the capacitor electrode, which can provide reaction activation energy and promote the electrode reaction. At the same time, the main solvent can also absorb some harmful substances, such as oxygen and water, to reduce their interference with the electrochemical reaction.

[0026] On this basis, an auxiliary solvent is combined, wherein the auxiliary solvent is selected from one or two of diethylene glycol monobutyl ether, diethylene glycol, propylene glycol, propylene carbonate, diethylene glycol dibutyl ether, ethylene glycol ethyl ether acetate, 3-methoxybutanol, 1,2-propylene glycol carbonate, and ethylene glycol methyl ether. Using a substance with strong polarity and a relatively low freezing point as an auxiliary solvent greatly reduces the intermolecular force of the solvent and improves the low temperature resistance of the electrolyte.

[0027] The additive includes a flash enhancer selected from one or more of ethylene glycol, polyvinyl alcohol, polypropylene alcohol, modified nano silica sol, polymer organic carboxylate, and polyester. In some embodiments, the additive also includes a mixture of one or more of adiponitrile, vinyl sulfate, n-butyl phosphoric anhydride, pentafluoroethyl phosphoric anhydride, and fluoroethylene carbonate.

[0028] The main function of adding a flash enhancer to the electrolyte is to significantly increase the flash voltage of the electrolyte, thereby enhancing the safety and stability of the electrolyte and the entire high-voltage aluminum electrolytic capacitor. The flash enhancer can be adsorbed on the electrodes of the aluminum electrolytic capacitor, such as the surface of the anode foil, to fill its defects, and can also form a protective film on the surface of the electrode to reduce the direct contact between the electrode and the electrolyte. On the other hand, it exhibits a strong ionization ability in the electrolyte system, thereby increasing the voltage boost rate and flash voltage of the electrolyte. It can exist stably under the action of an electric field, significantly increase the flash point of electrolysis, and effectively prevent or delay the flash phenomenon of high-voltage electrolytes.

[0029] The additives also include a dehydrogenating agent, which is selected from one or two or more of p-nitrophenol, p-nitrobenzyl alcohol, p-benzoquinone, o-nitrobenzyl alcohol, o-nitroanisole, p-nitrobenzyl alcohol, and p-nitrobenzoic acid.

[0030] The main function of hydrogen remover is to reduce or eliminate the hydrogen produced by electrolyte in the electrochemical process. By reducing hydrogen production and improving electrolyte performance, the service life of capacitors can be extended.

[0031] The stabilizer is selected from two or more of ethylenediaminetetraethylamine, methyl phosphate, butyl phosphate, phosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, sorbitol, glucitol, boric acid, and ammonium pentaborate.

[0032] A long carbon chain polybasic organic carboxylic acid ammonium salt with a special structure and multiple branches is used as the main solute of the electrolyte. The solute has good solubility due to its multiple branches; the polybasic carboxylic acid structure can greatly improve the degree of ionization and increase the conductivity of the electrolyte; at the same time, a substance with strong polarity and relatively low freezing point is used as an auxiliary solvent, which greatly reduces the intermolecular force of the solvent and improves the low temperature resistance of the electrolyte. The above two factors work together to overcome the defects of the existing high-voltage electrolyte, which has greatly reduced solubility under low temperature conditions, extremely small capacity extraction rate, and very large impedance, so that the high-voltage electrolyte can maintain good liquid performance under ultra-low temperature conditions. Thereby solving the problem of large capacity attenuation and high impedance of high-voltage aluminum capacitors at ultra-low temperatures.

[0033] The following are specific embodiments: Example 1

[0034] The long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt in this embodiment has the following structural formula:

[0035] Wherein: R1 and R2 are C1-4 alkyl, R3 and R4 are independently selected from one or two of H, C1-6 alkyl, and C2-8 alkenyl; x, y, and z are independently selected from numbers in the range of 1-8.

[0036] Among them, the pH is 6.52.

[0037] The preparation method of the electrolyte comprises the following steps: SI: 80% ethylene glycol and 5% diethylene glycol monobutyl ether were mixed and heated to 50 to 70 ° C to obtain a mixture A; S2: Add 5% of a long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt and 3% of a modified nano-silica sol to the mixture A obtained in SI, and heat to 120 to 130 ℃, and stir at a constant temperature for 40 to 60min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80°C, 2% p-nitrophenol and 5% ethylenediaminetetraethylamine are added, and the mixture is continuously stirred and cooled to room temperature; a high-voltage electrolyte resistant to ultra-low temperature is obtained. Example 2

[0038] The long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt in this embodiment has the following structural formula:

[0039] Wherein: R1 and R2 are C1-4 alkyl, R3 and R4 are independently selected from one or two of H, C1-6 alkyl, and C2-8 alkenyl; x, y, and z are independently selected from numbers in the range of 1-8.

[0040] Among them, the pH is 6.68.

[0041] The preparation method of the electrolyte comprises the following steps: SI: 74% ethylene glycol and 8% ethylene glycol dibutyl ether were mixed and heated to 50 to 70 ° C to obtain a mixture A; S2: Add 8% of a long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt and 3% polyvinyl alcohol to the mixture A obtained in SI, and heat to 120 to 130 ℃, and stir at a constant temperature for 40 to 60min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80°C, 2% of o-nitroanisole and 5% of diammonium phosphate are added, and the mixture is cooled to room temperature with continuous stirring; a high-voltage electrolyte resistant to ultra-low temperature is obtained. Example 3

[0042] The long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt in this embodiment has the following structural formula:

[0043] Wherein: R1 and R2 are C1-4 alkyl, R3 and R4 are independently selected from one or two of H, C1-6 alkyl, and C2-8 alkenyl; x, y, and z are independently selected from numbers in the range of 1 to 8. Wherein, pH is 6.62.

[0044] The preparation method of the electrolyte comprises the following steps: SI: 70% ethylene glycol and 12% ethylene glycol ethyl ether acetate were mixed and heated to 50 to 70 ° C to obtain a mixture A; S2: Add 8% of a long carbon chain multi-branched polybasic organic carboxylate ammonium salt and 3% of a polymeric organic carboxylate to the mixture A obtained in SI, and heat to 120 to 130 ° C and stir at a constant temperature for 40 to 60 min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80°C, 2% p-nitrobenzoic acid and 5% butyl phosphate are added, and the mixture is continuously stirred and cooled to room temperature; a high-voltage electrolyte resistant to ultra-low temperature is obtained. Example 4

[0045] The long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt in this embodiment has the following structural formula:

[0046] Wherein: R1 and R2 are C1-4 alkyl, R3 and R4 are independently selected from one or two of H, C1-6 alkyl, and C2-8 alkenyl; x, y, and z are independently selected from numbers in the range of 1-8.

[0047] The preparation method of the electrolyte comprises the following steps: SI: 65% ethylene glycol and 15% propylene carbonate were mixed and heated to 50 to 70 ° C to obtain a mixture A; S2: Add 10% of a long carbon chain multi-branched polybasic organic carboxylic acid ammonium salt and 3% polypropylene alcohol to the mixture A obtained in SI, and heat to 120 to 130 ℃, and stir at a constant temperature for 40 to 60min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80°C, 2% p-benzoquinone and 5% sorbitol are added, and the mixture is continuously stirred and cooled to room temperature; a high-voltage electrolyte resistant to ultra-low temperature is obtained. Comparative Example 1

[0048] In this embodiment, the long carbon chain multi-branched organic carboxylic acid ammonium salt is 10R-LDB: methyl ammonium azelaic acid, and its structural formula is as follows:

[0049] The preparation method of the electrolyte comprises the following steps: SI: 65% ethylene glycol and 15% propylene carbonate were mixed and heated to 50 to 70 ° C to obtain a mixture A; S2: 10R-LDB: 10% methyl ammonium azelaic acid and 3% polypropylene alcohol were added to the mixture A obtained in SI, and heated to 120 to 130 ℃, and stirred at a constant temperature for 40 to 60min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80°C, 2% p-benzoquinone and 5% sorbitol are added, and the mixture is continuously stirred and cooled to room temperature; a high-voltage resistant electrolyte is obtained. Comparative Example 2

[0050] In this embodiment, the long carbon chain multi-branched organic carboxylic acid ammonium salt is IPU22-LDB, and its structural formula is as follows:

[0051] Wherein: x and y are numbers independently selected from 1 to 8.

[0052] The preparation method of the electrolyte comprises the following steps: SI: 65% ethylene glycol and 15% propylene carbonate were mixed and heated to 50 to 70 ° C to obtain a mixture A; S2: Add 10R-LDB: IPU22-LDB 10% and polypropylene alcohol 3% to the mixture A obtained in SI, and heat to 120-130 ℃, and stir at a constant temperature for 40-60min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80°C, 2% p-benzoquinone and 5% sorbitol are added, and the mixture is continuously stirred and cooled to room temperature; a high-voltage resistant electrolyte is obtained.

[0053] Table 1 is the specific test parameters of the embodiments and comparative examples:

[0054] By comparing the examples with the comparative examples, it is concluded that the high-voltage electrolyte solute involved in the present invention has a long carbon chain and multi-branched polybasic organic carboxylic acid structure, and its addition amount in the electrolyte for high-voltage electrolytic capacitors can reach more than 10%. The conductivity and flash voltage values ​​are much higher than those of general long-carbon chain dicarboxylic acids, and there is no crystallization at -55°C, with excellent low-temperature performance.

[0055] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive, and therefore the present invention is not limited to the embodiments described in the specific implementation manners. Any other implementation manners derived by those skilled in the art based on the technical solutions of the present invention also fall within the scope of protection of the present invention.

Claims

1. A method for preparing a high-voltage aluminum electrolytic capacitor electrolyte with ultra-low temperature resistance, characterized in that: The ultra-low temperature resistant high-voltage electrolyte comprises: 60% to 80% of the main solvent; 5% to 10% of the auxiliary solvent; 3% to 10% of the solute; and 0.5% to 5% of the additive; wherein the additive comprises a flash enhancer, a hydrogen remover, a stabilizer, and a pH regulator; The solute is a polybasic organic carboxylic acid ammonium salt with a long carbon chain and multiple branches, and its main structural formula is as follows: Wherein: R1 and R2 are C1-4 alkyl, R3 and R4 are independently selected from one or two of H, C1-6 alkyl, and C2-8 alkenyl; x, y, and z are independently selected from numbers in the range of 1-8.

2. The method for preparing a high-voltage aluminum electrolytic capacitor electrolyte with ultra-low temperature resistance according to claim 1, characterized in that: The main solvent is ethylene glycol; the auxiliary solvent is an organic substance with a freezing point lower than that of the main solvent.

3. The method for preparing a high-voltage aluminum electrolytic capacitor electrolyte with ultra-low temperature resistance according to claim 1, characterized in that: The auxiliary solvent is selected from one or two of diethylene glycol monobutyl ether, diethylene glycol, propylene glycol, propylene carbonate, diethylene glycol dibutyl ether, ethylene glycol ethyl ether acetate, 3-methoxybutanol, 1,2-propylene glycol carbonate, and ethylene glycol methyl ether.

4. The method for preparing a high-voltage aluminum electrolytic capacitor electrolyte with ultra-low temperature resistance according to claim 1, characterized in that: The flash enhancer is selected from one or two or more of ethylene glycol, polyvinyl alcohol, polypropylene alcohol, modified nano silica sol, high molecular weight polymer organic carboxylate, and polyester.

5. The method for preparing a high-voltage aluminum electrolytic capacitor electrolyte with ultra-low temperature resistance according to claim 1, characterized in that: The hydrogen remover is selected from one or two or more of p-nitrophenol, p-nitrobenzyl alcohol, p-benzoquinone, o-nitrobenzyl alcohol, o-nitroanisole, p-nitrobenzyl alcohol and p-nitrobenzoic acid.

6. The method for preparing a high-voltage aluminum electrolytic capacitor electrolyte with ultra-low temperature resistance according to claim 1, characterized in that: The stabilizer is selected from two or more of ethylenediaminetetraethylamine, methyl phosphate, butyl phosphate, phosphoric acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, sorbitol, glucitol, boric acid, and ammonium pentaborate.

7. The method for preparing a high-voltage aluminum electrolytic capacitor electrolyte with ultra-low temperature resistance according to claim 1, characterized in that: The preparation method of the electrolyte comprises the following steps: SI: The main solvent and the auxiliary solvent are uniformly mixed in proportion and heated to 50 to 70 ℃ to obtain a mixture A; S2: Add the solute and the flash enhancer to the mixture A obtained in SI, and heat to 120-130 ℃, and stir at a constant temperature for 40-60min to obtain a mixture B; S3: The mixture B obtained in S2 is naturally cooled to 70-80° C., a dehydrogenating agent and a stabilizer are added, and the mixture is continuously stirred and cooled to room temperature to obtain a high-voltage electrolyte resistant to ultra-low temperature.

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