Low-leakage electrolyte

Abstract

The invention provides an electrolyte with low electric leakage. The electrolyte is prepared from the following components in parts by mass: 60 to 65 parts of EG (Ethylene Glycol), 0.3 to 0.8 part of PVA (Polyvinyl Alcohol), 1.5 to 2.2 parts of SVP-05B, 1.8 to 2.3 parts of AS (Acrylonitrile Styrene), 0.8 to 1.4 parts of C6, 1.8 to 2.3 parts of AA (Acrylic Acid), 1.7 to 2.4 parts of A00, 7.5 to 8.8 parts of HA-WP, 1.7 to 2.2 parts of ADD, 0.15 to 0.32 part of AZBH and 0.8 to 1.2 parts of PNAC. According to the electrolyte, the explosion-proof performance and the temperature-resistant performance are effectively improved, the electrolyte has good thermal stability and low leakage current at a high temperature through the leakage current inhibitor, the conductivity of the electrolyte can be remarkably improved, and the electrolyte can form a protective film and has the performance of high frequency, low impedance, temperature resistance and long service life.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytes, in particular to a low leakage electrolyte. Background Art

[0002] Aluminum electrolytic capacitors are the most widely used basic components in electronic products. With the rapid development of science and technology and the electronics industry, the requirements for various components have been further improved, especially the performance requirements for aluminum electrolytic capacitors have also posed new challenges. The electrolyte is the core component of aluminum electrolytic capacitors and the actual cathode of aluminum electrolytic capacitors. The service life, reliability and electrification parameters of the capacitor are closely related to it, and the quality of its performance directly affects the quality.

[0003] In some formulations, when the temperature drops in winter or low-temperature seasons, after the solvent is mixed, the freezing point of the mixture system or the temperature of the precipitated solid will change greatly, the viscosity of the electrolyte will increase, and the conductivity will decrease, which leads to poor discharge performance of the electrolyte at low temperatures. Ethyl acetate (EA) has been widely used in low-temperature electrolytes. It has very good low-temperature properties and is very cheap, making it very suitable as a solvent. The dosage of 10-30% is relatively common. However, after EA is added, the cycle life decreases slightly; and in addition to the temperature factor, the viscosity of the solvent is also very important. Traditionally, solvents such as dimethyl carbonate and methyl acetate are often used, which may be partially converted into dimethyl esters during long-term cycles and easily produce gas, causing the capacitor to soften. Summary of the invention

[0004] The object of the present invention is to provide a low leakage electrolyte with good consistency and stable quality.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a low leakage electrolyte, wherein the mass parts of the components of the electrolyte are: 60-65 parts of EG, 0.3-0.8 parts of PVA, 1.5-2.2 parts of SVP-05B, 1.8-2.3 parts of AS, 0.8-1.4 parts of C6, 1.8-2.3 parts of AA, 1.7-2.4 parts of A00, 7.5-8.8 parts of HA-WP, 1.7-2.2 parts of ADD, 0.15-0.32 parts of AZBH, and 0.8-1.2 parts of PNAC.

[0006] Step 1: Add the raw materials of each component into a stirring tank according to a proportion, mix and stir under the condition that the humidity is less than 65% to obtain a mixed solution; Step 2: Input the mixed solution into a high temperature and high pressure reactor and heat the reactor to 120°C; Step 3: Adjust the pressure of the reactor to 6.5-7.3 MPa, stir for 15 minutes, and maintain 200 rpm during stirring; Step 4: Heat the reactor to 145-175°C, adjust the reactor pressure to 9-9.5 MPa, stir for 20 minutes, maintain 800 rpm during stirring, and keep the pressure for 30-60 minutes after stirring to form a liquid billet; Step 5: Cool the liquid in the reactor to 110°C and inject it into a vacuum concentrator for vacuum concentration to reduce the water precipitated in the electrolyte and make the electrolyte more stable; Step 6: placing the concentrated electrolyte in a cooler for cooling to reduce the temperature of the electrolyte to avoid the formation of precipitates due to excessively high temperature; The seventh step is to place the cooled electrolyte into a canning machine and inspect it before canning to ensure the quality of the electrolyte.

[0007] After adopting the above scheme, the polymerization degree of PVA (polyvinyl alcohol) is divided into ultra-high polymerization degree. After being combined with ammonium sebacate and ammonium azelaic acid to form an electrolyte, the viscosity of the solution increases, and a protective film can be formed on the negative electrode. The strength and solvent resistance of the film after formation are improved. Ammonium pentaborate is beneficial to the synthesis of boride intermediates in the electrolyte, and increases the explosion-proof and heat-resistant properties of the electrolyte. The leakage current inhibitor makes the electrolyte have good thermal stability at high temperature, low leakage current, and the conductivity of the electrolyte will increase significantly. The electrolyte after adopting this scheme can form a protective film, and has high frequency, low impedance, heat resistance and long life performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a test curve diagram of the present invention.

[0009] Figure 2 This is the thermal shock test report of the present invention.

[0010] Figure 3 This is the surge test report of the present invention.

[0011] Figure 4 This is a low temperature storage test report of the present invention.

[0012] Figure 5 This is a moisture resistance test report of the present invention.

[0013] Figure 6 This is the explosion-proof test report of the present invention.

[0014] Figure 7 This is a vibration resistance test report of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described below. The preferred embodiments of the present invention are as follows: Figure 1 To Attachment Figure 7 , the glossary of the present invention is as follows: EG :ethylene glycol PVA: Polyvinyl alcohol: Made from vinyl acetate through polymerization and alcoholysis SVP-05B: Ammonium pentaborate AS: Ammonium Sebacate C6: Sorbitol AA: Ammonium Azelate A00: Ultrapure water HA-WP: Flash Voltage Boosters ADD :Ammonium dodecanedioate AZBH: Leakage current inhibitor PNAC: Hydrogen Remover The mass parts of the components of the electrolyte are: 60 parts of EG, 0.4 parts of PVA, 1.7 parts of SVP-05B, 1.9 parts of AS, 0.9 parts of C6, 2 parts of AA, 1.8 parts of A00, 8 parts of HA-WP, 1.9 parts of ADD, 0.16 parts of AZBH, and 0.9 parts of PNAC.

[0016] The formulation of the above components is prepared according to the following steps: Step 1: Add the raw materials of each component into a stirring tank according to a proportion, mix and stir under the condition that the humidity is less than 65% to obtain a mixed solution; Step 2: Input the mixed solution into a high temperature and high pressure reactor and heat the reactor to 120°C; Step 3: Adjust the pressure of the reactor to 6.5-7.3 MPa, stir for 15 minutes, and maintain 200 rpm during stirring; Step 4: Heat the reactor to 145-175°C, adjust the reactor pressure to 9-9.5 MPa, stir for 20 minutes, maintain 800 rpm during stirring, and keep the pressure for 30-60 minutes after stirring to form a liquid billet; Step 5: Cool the liquid in the reactor to 110°C and inject it into a vacuum concentrator for vacuum concentration to reduce the water precipitated in the electrolyte and make the electrolyte more stable; Step 6: placing the concentrated electrolyte in a cooler for cooling to reduce the temperature of the electrolyte to avoid the formation of precipitates due to excessively high temperature; The seventh step is to place the cooled electrolyte into a canning machine and inspect it before canning to ensure the quality of the electrolyte.

[0017] After adopting the above scheme, the polymerization degree of PVA (polyvinyl alcohol) is divided into ultra-high polymerization degree. After being combined with ammonium sebacate and ammonium azelaic acid to form an electrolyte, the viscosity of the solution increases, and a protective film can be formed on the negative electrode. The strength and solvent resistance of the film after formation are improved. Ammonium pentaborate is beneficial to the synthesis of boride intermediates in the electrolyte, and increases the explosion-proof and temperature-resistant properties of the electrolyte. The leakage current inhibitor makes the electrolyte have good thermal stability at high temperatures, low leakage current, and the conductivity of the electrolyte will increase significantly. The electrolyte after adopting this scheme can form a protective film with high frequency, low impedance, temperature resistance and long life performance.

[0018] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low leakage electrolyte, characterized in that: The mass parts of the components of the electrolyte are: 60-65 parts of EG, 0.3-0.8 parts of PVA, 1.5-2.2 parts of SVP-05B, 1.8-2.3 parts of AS, 0.8-1.4 parts of C6, 1.8-2.3 parts of AA, 1.7-2.4 parts of A00, 7.5-8.8 parts of HA-WP, 1.7-2.2 parts of ADD, 0.15-0.32 parts of AZBH, and 0.8-1.2 parts of PNAC.

2. A low leakage electrolyte according to claim 1, characterized in that: The preparation method of the electrolyte comprises the following steps: Step 1: Add the raw materials of each component into a stirring tank according to a proportion, mix and stir under the condition that the humidity is less than 65% to obtain a mixed solution; Step 2: Input the mixed solution into a high temperature and high pressure reactor and heat the reactor to 120°C; Step 3: Adjust the pressure of the reactor to 6.5-7.3 MPa, stir for 15 minutes, and maintain 200 rpm during stirring; Step 4: Heat the reactor to 145-175°C, adjust the reactor pressure to 9-9.5 MPa, stir for 20 minutes, maintain 800 rpm during stirring, and keep the pressure for 30-60 minutes after stirring to form a liquid billet; Step 5: Cool the liquid in the reactor to 110°C and inject it into a vacuum concentrator for vacuum concentration to reduce the water precipitated in the electrolyte and make the electrolyte more stable; Step 6: placing the concentrated electrolyte in a cooler for cooling to reduce the temperature of the electrolyte to avoid the formation of precipitates due to excessively high temperature; The seventh step is to place the cooled electrolyte into a canning machine and inspect it before canning to ensure the quality of the electrolyte.

Images