High-performance aluminum electrolytic capacitor electrolyte and preparation method thereof

Abstract

The invention relates to the technical field of aluminum electrolytic capacitor electrolyte processing, in particular to a high-performance aluminum electrolytic capacitor electrolyte and a preparation method thereof. The invention discloses a water-soluble conductive agent, which is prepared from the following raw materials in percentage by weight: 5 to 10 percent of conductive salt, 0.1 to 2 percent of corrosion inhibitor, 3 to 5 percent of butyl-terminated fatty alcohol-polyoxyethylene ether, 2 to 5 percent of polyacrylic acid-polyacrylamide diblock copolymer, 0.5 to 2 percent of additive, 0.5 to 2 percent of straight-chain polycarboxylic acid, 6 to 10 percent of ionic liquid and the balance of solvent, the butyl-terminated fatty alcohol-polyoxyethylene ether has the structural formula of R-O-(CH2CH2O) xCH2CH2OBu, r represents a fatty alcohol group, is C12-18 alkyl, and is a straight chain or a branched chain; n is the addition number of ethylene oxide, and x is equal to 10-50; through the synergistic effect of the components in the formula, a stable and efficient electrolyte system is formed, the performance and reliability of the aluminum electrolytic capacitor in severe environments such as high temperature and low temperature are remarkably improved, the service life of the aluminum electrolytic capacitor is prolonged, and the requirements of modern electronic equipment for high-performance capacitors are met.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum electrolytic capacitor electrolyte processing, and more specifically, to a high-performance aluminum electrolytic capacitor electrolyte and a preparation method thereof. Background Art

[0002] With the rapid development of electronic technology, aluminum electrolytic capacitors, as a key electronic component, are widely used in various electronic devices. In particular, due to their large capacity and high cost-effectiveness, they play an irreplaceable role in many fields, including consumer electronics, industrial control equipment, and communications equipment. The core performance of aluminum electrolytic capacitors depends largely on the electrolyte used. The current electrolyte formula of aluminum electrolytic capacitors mainly consists of three parts: organic solvent, conductive salt, and additives.

[0003] Commonly used organic solvents include gamma-butyrolactone (GBL), ethylene glycol (EG), propylene glycol (PG), and propylene carbonate (PC). These solvents meet the basic performance requirements of electrolytes to a certain extent, such as providing good dielectric properties and solubility, enabling the electrolyte to effectively conduct ions within the capacitor. As for conductive salts, borates, adipates, and fatty acid salts are common choices. They ionize in the solvent to produce conductive ions, thereby providing the necessary conductivity for aluminum electrolytic capacitors. Additives play a variety of roles in electrolytes. For example, pH buffers stabilize the electrolyte's pH and maintain its chemical balance and stability. Hydrogen scavengers reduce hydrogen gas generated during use, reducing the risk of hydrogen accumulation and swelling within the capacitor. Antioxidants prevent oxidation and deterioration during storage and use, extending the electrolyte's service life. Viscosity modifiers adjust the electrolyte's viscosity, improving its fluidity and filling properties within the capacitor. However, in practical applications, existing electrolyte technology has exposed many shortcomings. At high temperatures, the electrolyte's stability is poor. As the temperature rises, the solvent evaporates faster, causing changes in the electrolyte's composition. This in turn causes fluctuations in the capacitor's performance parameters, such as a decrease in capacitance and an increase in equivalent series resistance (ESR), which seriously affects the capacitor's normal operation and reliability. At low temperatures, the electrolyte's viscosity increases significantly, slowing the migration rate of ions. This significantly limits the capacitor's charge and discharge efficiency at low temperatures, making it difficult for the capacitor to fully realize its performance and unable to meet the stable operation requirements of electronic equipment over a wide temperature range.

[0004] Therefore, developing a high-performance aluminum electrolytic capacitor electrolyte that can overcome the shortcomings of existing technologies and has good high-temperature stability, low-temperature performance, electrochemical stability and a longer service life has important practical significance and broad application prospects for improving the overall performance and reliability of aluminum electrolytic capacitors and meeting the needs of modern electronic devices for high-performance capacitors. Summary of the Invention

[0005] In order to improve the high temperature stability, low temperature performance, electrochemical stability and longer service life of aluminum electrolytic capacitor electrolyte, the present application provides a high-performance aluminum electrolytic capacitor electrolyte and a preparation method.

[0006] In a first aspect, the present application provides a high-performance aluminum electrolytic capacitor electrolyte, which adopts the following technical solution: A high-performance aluminum electrolytic capacitor electrolyte is prepared from the following raw materials in the following weight percentages: Conductive salt 5-10% Corrosion inhibitor 0.1-2% Fatty alcohol polyoxyethylene ether butyl end capping 3-5% Polyacrylic acid-polyacrylamide diblock copolymer 2-5% Additives 0.5-2% Linear polycarboxylic acid 0.5-2% Ionic liquid 6-10% The remaining amount is solvent. The structural formula of the fatty alcohol polyoxyethylene ether butyl end capping is RO-(CH2CH2O)xCH2CH2OBu, wherein R represents a fatty alcohol group, which is C 12-18 The alkyl group is straight or branched; n is the number of ethylene oxide additions, x = 10-50; Bu represents a butyl end-capping group; The structural formula of the polyacrylic acid-polyacrylamide diblock copolymer is as follows: Among them, n=20-40, m=30-50.

[0007] By adopting the above technical solution, a stable and efficient electrolyte system is formed through the synergistic effect of various components, which significantly improves the performance and reliability of aluminum electrolytic capacitors in harsh environments such as high and low temperatures, extends their service life, and meets the needs of modern electronic equipment for high-performance capacitors.

[0008] The conductive salt ionizes in the solvent to produce conductive ions, and the addition of the ionic liquid increases the ion concentration and electrochemical stability of the electrolyte. The solvent acts as a carrier, providing a dissolution environment for the conductive salt and ionic liquid. The three interact to ensure that the electrolyte maintains good conductivity across various temperature conditions. At high temperatures, the ionic liquid prevents excessive solvent volatilization, which could lead to abnormal changes in the conductive salt concentration. At low temperatures, the solvent and ionic liquid work together to ensure that the conductive salt can ionize normally to produce the conductive ions required for capacitor operation.

[0009] The polyacrylic acid-polyacrylamide diblock copolymer forms a network structure within the electrolyte, helping to stabilize the electrolyte system. The butyl-terminated fatty alcohol polyoxyethylene ether fills the gaps in the network structure, further regulating the viscosity and fluidity of the electrolyte. At high temperatures, their combined effect prevents excessive evaporation and decomposition of the electrolyte; at low temperatures, their synergistic effect ensures the electrolyte's low-temperature fluidity, enabling smooth ion migration. Furthermore, the two copolymers work in conjunction with the ionic liquid to optimize ion migration pathways, improve the electrolyte's conductivity, and enhance the capacitor's charge and discharge efficiency in both high and low temperature environments.

[0010] Linear polycarboxylic acids can work together with corrosion inhibitors to further enhance the electrolyte's protective effect on aluminum foil electrodes. They also work in conjunction with antioxidants in additives to improve the electrolyte's antioxidant properties, preventing oxidative deterioration during storage and use. Furthermore, linear polycarboxylic acids can interact with ionic liquids to optimize the electrolyte's electrochemical properties, improving the stability and reliability of capacitors.

[0011] Preferably, the ionic liquid is composed of 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide and 1-butyl-3-methylimidazolium tetrafluoroborate in a weight ratio of (2-6):1.

[0012] By adopting the above technical solution, optimizing the type and dosage of ionic liquids, further improving the thermal stability of the electrolyte in high temperature environments, it can effectively reduce the loss and performance degradation of the electrolyte under high temperature conditions, maintain the stability of the electrolyte composition and performance, and thus ensure the stability of parameters such as the capacitance value and equivalent series resistance of the aluminum electrolytic capacitor under high temperature, thereby extending the service life of the capacitor; and this combination can effectively reduce the viscosity of the electrolyte under low temperature conditions, so that the electrolyte maintains good fluidity, which is conducive to the migration and transmission of ions. Compared with a single ionic liquid, this combination can better overcome the resistance to ion migration at low temperatures and reduce the time constant of ion transmission, thereby improving the charge and discharge efficiency and dynamic response capability of the capacitor under low temperature environments.

[0013] At the same time, the combined use of the two can better inhibit the volatilization of organic solvents, reduce the volatilization rate of the electrolyte, reduce the risk of electrolyte drying up and capacitor performance degradation due to solvent volatilization, and improve the reliability and durability of the capacitor in high temperature environments.

[0014] Preferably, the corrosion inhibitor is composed of benzotriazole, hexamethylenetetramine and diammonium hydrogen phosphate in a weight ratio of (2-4):0.5:(1-2).

[0015] By adopting this technical solution, benzotriazole forms a stable film on the aluminum foil surface, blocking corrosive media. Hexamethylenetetramine and diammonium hydrogen phosphate synergistically enhance the density and stability of the protective film. Together, these three ingredients significantly improve the foil's corrosion resistance, effectively preventing electrode corrosion, maintaining capacitor capacitance stability, and avoiding short-circuit failures.

[0016] At the same time, this corrosion inhibitor combination effectively maintains the stability of the electrode-electrolyte interface, reducing the interference of corrosion products on the electrolyte's conductivity and chemical equilibrium. During capacitor operation, it stabilizes the electrode structure, reduces leakage current and equivalent series resistance (ESR) fluctuations, and improves the stability and reliability of the capacitor under various operating conditions, extending its service life and ensuring stable operation of electronic equipment.

[0017] Preferably, the linear polycarboxylic acid comprises at least one of glutaric acid, adipic acid, azelaic acid and sebacic acid.

[0018] By adopting the above technical solution, the type of branched polyacid is optimized, which coordinates with the electrode metal of the aluminum electrolytic capacitor to form a stable complex. This complex layer covers the electrode surface, effectively preventing corrosive ions in the electrolyte from directly contacting the electrode, thereby significantly reducing the corrosion rate of the electrode, enhancing the durability of the capacitor, reducing performance degradation and failure caused by electrode corrosion, and ensuring the long-term stable operation of the capacitor.

[0019] At the same time, it can participate in regulating the acid-base balance of the electrolyte system. It can interact with other components in the electrolyte, buffering pH fluctuations and maintaining a relatively stable acid-base environment. This helps stabilize the chemical state of the components in the electrolyte, preventing precipitation, decomposition, or deterioration of components caused by abnormal pH changes, ensuring the stability of the electrolyte's electrochemical properties, thereby maintaining the normal operation of the capacitor, improving its reliability, and meeting the strict stability requirements of electronic equipment.

[0020] Preferably, the solvent is composed of ethylene glycol, ethylene glycol methyl ether, propylene carbonate and γ-butyrolactone in a weight ratio of 10:(4-6):(2-4):(2-3).

[0021] By adopting the above technical solution, the type and amount of solvent are optimized, which has excellent dielectric properties and solubility, can effectively dissolve conductive salts and other components, form a uniform and stable electrolyte system, and enable the electrolyte to maintain high ionic conductivity over a wide temperature range, thereby improving the charge and discharge efficiency and cycle life of aluminum electrolytic capacitors, and meeting the high requirements of electronic equipment for capacitor performance.

[0022] Preferably, the conductive salt includes at least one of borates, adipates, fatty acid salts, lithium tetrafluoroborate and lithium perchlorate.

[0023] By adopting the above technical solution, the type of conductive salt is optimized, and a large number of conductive ions are ionized in the solvent, which greatly improves the conductivity of the electrolyte and meets the fast charging and discharging requirements of the capacitor.

[0024] Preferably, the additives include an antioxidant, a pH buffer and a hydrogen scavenger.

[0025] Preferably, the hydrogen scavenger includes at least one of diphenyl propargyl ether, nitrobenzyl alcohol and p-nitrobenzoic acid.

[0026] Preferably, the pH buffer comprises at least one of ammonium pentaborate, ammonium adipate, ammonium dihydrogen phosphate and ammonium acetate.

[0027] Antioxidants can effectively prevent oxidation and deterioration of the electrolyte during storage and use, extending its service life. pH buffers regulate and stabilize the electrolyte's pH, maintaining its chemical balance and stability. They prevent precipitation, decomposition, or deterioration of electrolyte components caused by abnormal pH fluctuations, ensuring stable electrochemical performance. Hydrogen scavengers can reduce the amount of hydrogen generated during use, reducing the risk of hydrogen accumulation and swelling inside the capacitor.

[0028] In a second aspect, the present application provides a method for preparing a high-performance aluminum electrolytic capacitor electrolyte, using the following technical solution: A method for preparing a high-performance aluminum electrolytic capacitor electrolyte comprises the following steps: S1. Heat the solvent and the polyacrylic acid-polyacrylamide diblock copolymer to 60-70° C. until the polyacrylic acid-polyacrylamide diblock copolymer is completely dissolved, then add the fatty alcohol polyoxyethylene ether butyl end-capping agent and stir until dissolved to obtain a mixed solution; S2. Evenly stir the mixed solution, conductive salt, corrosion inhibitor, additive, linear polycarboxylic acid and ionic liquid to obtain a high-performance aluminum electrolytic capacitor electrolyte.

[0029] By heating the solvent and polyacrylic acid-polyacrylamide diblock copolymer to 60-70°C, the polyacrylic acid-polyacrylamide diblock copolymer is completely dissolved in the solvent, forming a uniform solution. Subsequently, a fatty alcohol polyoxyethylene ether butyl endcapping agent is added and stirred until dissolved, further improving the uniformity and stability of the mixture. Conductive salts, corrosion inhibitors, additives, linear polycarboxylic acids, and ionic liquids are then added and thoroughly stirred to ensure that all components are evenly dispersed in the solution, forming a high-performance aluminum electrolytic capacitor electrolyte with consistent performance.

[0030] Moreover, the overall preparation process is simple to operate and easy to control, does not require complicated equipment and tedious steps, and is suitable for large-scale industrial production.

[0031] In summary, this application has the following beneficial effects: 1. This high-performance aluminum electrolytic capacitor electrolyte significantly improves the performance and reliability of aluminum electrolytic capacitors by optimizing the synergistic effect of various components. Conductive salts, ionic liquids, and solvents work together to maintain stable conductive properties at different temperatures, inhibit solvent volatilization and changes in conductive salt concentration at high temperatures, and ensure normal ionization and migration of ions at low temperatures. The polyacrylic acid-polyacrylamide diblock copolymer and the fatty alcohol polyoxyethylene ether butyl end capping work together to form a network structure to stabilize the electrolyte system, adjust the viscosity and fluidity, and prevent evaporation and decomposition and ensure fluidity at high and low temperatures respectively. Straight-chain polycarboxylic acids work synergistically with corrosion inhibitors and antioxidants to enhance protection of aluminum foil electrodes, improve antioxidant properties, and extend service life. The interaction of various components optimizes electrochemical properties, allowing capacitors to have better charge and discharge efficiency and stability in harsh environments such as high and low temperatures, meeting the needs of modern electronic devices for high-performance capacitors. DETAILED DESCRIPTION Example

[0032] Example 1 A high-performance aluminum electrolytic capacitor electrolyte is prepared by the following method: S1. Heat 829 g of solvent and 20 g of polyacrylic acid-polyacrylamide diblock copolymer to 60° C. until the polyacrylic acid-polyacrylamide diblock copolymer is completely dissolved, then add 30 g of fatty alcohol polyoxyethylene ether butyl end-capping agent and stir until dissolved to obtain a mixed solution; S2. Evenly stir the mixed solution, 50 g of conductive salt (sodium borate), 1 g of corrosion inhibitor, additives (1 g of antioxidant (2,6-di-tert-butyl-p-cresol), 2 g of pH buffer (ammonium pentaborate), 2 g of hydrogen scavenger (diphenyl propargyl ether)), 5 g of linear polycarboxylic acid (glutaric acid) and 60 g of ionic liquid to obtain a high-performance aluminum electrolytic capacitor electrolyte.

[0033] The structural formula of fatty alcohol polyoxyethylene ether butyl end capping is RO-(CH2CH2O)xCH2CH2OBu, where R represents fatty alcohol group, which is a straight chain C 12 n is the number of ethylene oxide additions, x = 10; Bu represents a butyl end-capping group.

[0034] The structural formula of polyacrylic acid-polyacrylamide diblock copolymer is as follows: Among them, n=20, m=30.

[0035] The ionic liquid is composed of 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide and 1-butyl-3-methylimidazolium tetrafluoroborate in a weight ratio of 2:1.

[0036] The corrosion inhibitor is composed of benzotriazole, hexamethylenetetramine and diammonium hydrogen phosphate in a weight ratio of 2:0.5:1. The solvent consists of ethylene glycol, ethylene glycol methyl ether, propylene carbonate and gamma-butyrolactone in a weight ratio of 10:4:2:3.

[0037] The difference between Example 2-3 and Example 1 is that the types, amounts and parameters of raw materials used to prepare the high-performance aluminum electrolytic capacitor electrolyte are different. The specific differences are shown in Table 1: Table 1 Raw material types, amounts and parameters for preparing high performance aluminum electrolytic capacitor electrolytes in Examples 1-3 Example 4 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this embodiment and embodiment 1 is that the ionic liquid is 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide.

[0038] Example 5 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this embodiment and embodiment 1 is that the corrosion inhibitor is composed of benzotriazole and hexamethylenetetramine in a weight ratio of 2:0.5.

[0039] Example 6 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this embodiment and embodiment 1 is that the solvent is composed of ethylene glycol and ethylene glycol methyl ether in a weight ratio of 10:4.

[0040] Example 7 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this embodiment and embodiment 1 is that the structural formula of the fatty alcohol polyoxyethylene ether butyl end capping is RO-(CH2CH2O)xCH2CH2OBu, wherein R represents a fatty alcohol group, which is a branched C 12n is the number of ethylene oxide additions, x=10; Bu represents a butyl end-capping group.

[0041] Comparative Example Comparative Example 1 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this comparative example and Example 1 is that polyethylene glycol is used instead of fatty alcohol polyoxyethylene ether butyl end-capping.

[0042] Comparative Example 2 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this comparative example and Example 1 is that polyacrylic acid is used instead of polyacrylic acid-polyacrylamide diblock copolymer.

[0043] Comparative Example 3 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this comparative example and Example 1 is that no linear polyacid is added.

[0044] Comparative Example 4 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this comparative example and Example 1 is that the amount of ionic liquid is changed to 3g.

[0045] Comparative Example 5 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this comparative example and Example 1 is that the amount of fatty alcohol polyoxyethylene ether butyl end-capping is changed to 60g.

[0046] Comparative Example 6 A high-performance aluminum electrolytic capacitor electrolyte. The difference between this comparative example and Example 1 is that the amount of polyacrylic acid-polyacrylamide diblock copolymer is changed to 70g.

[0047] Detection method / test method Conductivity test: 20 ml of each of the high-performance aluminum electrolytic capacitor electrolytes prepared in Examples 1-7 and Comparative Examples 1-6 were placed in a beaker. According to NB / T42006-2013 "Test Method for Electrolytes for All-Vanadium Redox Flow Batteries," the beakers containing the test solutions were placed in a constant-temperature water bath at 25°C to maintain a constant temperature. The conductivity of the working test solutions was measured using a conductivity meter. Three measurements were performed for each Example and Comparative Example, and the average of the three conductivity meter readings was used as the measurement result.

[0048] High-temperature resistance test: To simulate the changes in the electrolyte under ultra-high temperature environment in capacitors, the electrolyte is placed in a sealed stainless steel bottle and placed in an environment of 150°C for 1000 hours. The conductivity of the electrolyte is measured.

[0049] Low-temperature resistance test: To simulate the changes in the electrolyte under ultra-high temperature environment in capacitors, the electrolyte is placed in a sealed stainless steel bottle and placed in an environment of -45°C for 1000 hours. The conductivity and weight changes of the electrolyte are measured.

[0050] Service life: The electrolyte was applied to a 16V, 1000μF capacitor. A ripple current of 1650mA was applied at 105°C and 100kHz for 5000h to test the service life of the aluminum electrolytic capacitor.

[0051] Electrochemical impedance spectroscopy (EIS) testing: Aluminum electrolytic capacitor samples (the same as those used in the service life test) were grouped and each group of capacitors was subjected to different temperature and aging times. EIS testing was performed on each group of capacitors using an electrochemical workstation. The charge transfer resistance (Rct) of the electrolyte was measured at 50°C for 0, 500, and 1000 hours of aging. The experimental data is shown in Table 2. Table 2 Experimental data of Examples 1-7 and Comparative Examples 1-6 The experimental data of Example 1 and Comparative Examples 1-6 show that the formulation of the present application can ensure that the electrolyte has good conductivity, high and low temperature resistance, long service life, and good electrochemical stability. Among them, the increase in charge transfer resistance of Example 1 is relatively small, indicating that the electrolytes of these formulations have good electrochemical stability at 50°C. The increase in charge transfer resistance of Comparative Examples 1-6 is large, indicating that their electrochemical stability is poor. The conductivity, high and low temperature resistance, and service life of Comparative Examples 1-3 are not as good as those of Example 1, indicating that the overall performance is poor.

[0052] It can be seen from the experimental data of Example 1 and Examples 4-7 that the conductivity, high and low temperature resistance, service life and electrochemical stability in Example 1 are relatively good, indicating that the optimization of the type and amount of ionic liquid, the type and amount of buffer, the type and amount of solvent and the parameters of fatty alcohol polyoxyethylene ether butyl end-capping in this application is beneficial to the conductivity, high and low temperature resistance, long service life and electrochemical stability of the electrolyte.

[0053] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-performance aluminum electrolytic capacitor electrolyte, characterized in that: Prepared from the following raw materials in weight percentage: Conductive salt 5-10% Corrosion inhibitor 0.1-2% Fatty alcohol polyoxyethylene ether butyl end capping 3-5% Polyacrylic acid-polyacrylamide diblock copolymer 2-5% Additives 0.5-2% Linear polycarboxylic acid 0.5-2% Ionic liquid 6-10% The rest is solvent The structural formula of the butyl-terminated fatty alcohol polyoxyethylene ether is RO-(CH2CH2O)xCH2CH2OBu, wherein R represents a fatty alcohol group, which is C 12-18 The alkyl group is straight or branched; n is the number of ethylene oxide additions, x = 10-50; Bu represents a butyl end-capping group; The structural formula of the polyacrylic acid-polyacrylamide diblock copolymer is as follows: Among them, n=20-40, m=30-50.

2. The high-performance aluminum electrolytic capacitor electrolyte according to claim 1, characterized in that: The ionic liquid is composed of 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide and 1-butyl-3-methylimidazolium tetrafluoroborate in a weight ratio of (2-6):

1.

3. The high-performance aluminum electrolytic capacitor electrolyte according to claim 2, characterized in that: The corrosion inhibitor is composed of benzotriazole, hexamethylenetetramine and diammonium hydrogen phosphate in a weight ratio of (2-4): 0.5:(1-2) composition.

4. The high-performance aluminum electrolytic capacitor electrolyte according to claim 1, characterized in that: The conductive salt includes at least one of borates, adipates, fatty acid salts, lithium tetrafluoroborate and lithium perchlorate.

5. The high-performance aluminum electrolytic capacitor electrolyte according to claim 4, characterized in that: The linear polycarboxylic acid includes at least one of glutaric acid, adipic acid, azelaic acid and sebacic acid.

6. The high-performance aluminum electrolytic capacitor electrolyte according to claim 4, characterized in that: The solvent consists of ethylene glycol, ethylene glycol methyl ether, propylene carbonate and gamma-butyrolactone in a weight ratio of 10:(4-6):(2-4):(2-3).

7. The high-performance aluminum electrolytic capacitor electrolyte according to claim 1, characterized in that: The additives include antioxidants, pH buffers and hydrogen scavengers.

8. The high-performance aluminum electrolytic capacitor electrolyte according to claim 1, characterized in that: The hydrogen scavenger includes at least one of diphenyl propargyl ether, nitrobenzyl alcohol and p-nitrobenzoic acid.

9. The high-performance aluminum electrolytic capacitor electrolyte according to claim 1, characterized in that: The pH buffer includes at least one of ammonium pentaborate, ammonium adipate, ammonium dihydrogen phosphate and ammonium acetate.

10. A method for preparing a high-performance aluminum electrolytic capacitor electrolyte according to any one of claims 1 to 9, characterized in that: The method comprises the following preparation steps: S1. Heat the solvent and the polyacrylic acid-polyacrylamide diblock copolymer to 60-70° C. until the polyacrylic acid-polyacrylamide diblock copolymer is completely dissolved, then add the fatty alcohol polyoxyethylene ether butyl end-capping agent and stir until dissolved to obtain a mixed solution; S2. Evenly stir the mixed solution, conductive salt, corrosion inhibitor, additive, linear polycarboxylic acid and ionic liquid to obtain a high-performance aluminum electrolytic capacitor electrolyte.

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