A low internal resistance capacitor electrolyte

A capacitor and electrolyte technology, applied in the field of capacitors, can solve problems such as poor high temperature resistance, damage, and solvent volatilization, and achieve the effects of increasing capacity and service life, reducing equivalent internal resistance, and reducing internal resistance.

Active Publication Date: 2021-06-01
ANHUI SUREPHON CAPACITOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many problems in the traditional capacitor electrolyte, its high temperature resistance is poor, and the solvent is volatile, which leads to aging, damage and even spontaneous combustion of the capacitor after long-term use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A capacitor electrolyte solution with low internal resistance, including bisfluorosulfonimide lithium, propylene carbonate, N-alkyl benzimidazole cation, bisfluorosulfonimide anion and modified nano silver, the bis The mass ratio of lithium fluorosulfonyl imide, propylene carbonate, N-alkylbenzimidazolium cation, bisfluorosulfonyl imide anion and modified nano-silver is 0.5:0.8:0.15:0.15:0.005.

[0018] Further, the modified nano-silver includes the following raw materials in parts by mass: 25 parts of silver nitrate solution, 3 parts of vinyl distearic acid amide, 1 part of polyoxyethylene abietic acid, and 10 parts of calcium oxide.

[0019] Further, the mass fraction of the silver nitrate solution is 10%.

[0020] Further, the preparation method of the modified nano-silver is as follows: finely grind calcium oxide and pass through a 300-mesh sieve; The esters were mixed and heated to 65°C, ultrasonically dispersed for 35 minutes; the mixture was transferred to an ov...

Embodiment 2

[0023] A capacitor electrolyte with low internal resistance, comprising lithium tetrafluoroborate oxalate, dimethyl carbonate, N-alkyl benzimidazolium cation, tetrafluoroborate oxalate anion and modified nano silver, the lithium tetrafluoroborate oxalate , dimethyl carbonate, N-alkylbenzimidazolium cation, oxalate tetrafluoroborate anion and modified nano-silver in a mass ratio of 0.8:1.2:0.2:0.2:0.008.

[0024] Further, the modified nano-silver includes the following raw materials in parts by mass: 28 parts of silver nitrate solution, 4 parts of vinyl distearic acid amide, 2 parts of polyoxyethylene abietic acid, and 12 parts of calcium oxide.

[0025] Further, the mass fraction of the silver nitrate solution is 15%.

[0026] Further, the preparation method of the modified nano-silver is as follows: finely grind calcium oxide and pass through a 300-mesh sieve; The esters were mixed and heated to 70°C, ultrasonically dispersed for 40 minutes; the above mixture was transferred...

Embodiment 3

[0029] A capacitor electrolyte with low internal resistance, comprising lithium hexafluorophosphate, polycarbonate, N-alkyl benzimidazolium cation, hexafluorophosphate anion and modified nano-silver, said lithium hexafluorophosphate, polycarbonate, N-alkylbenzo The mass ratio of imidazolium cation, hexafluorophosphate anion and modified nano-silver is 1:1.5:0.3:0.3:0.01.

[0030] Further, the modified nano-silver includes the following raw materials in parts by mass: 30 parts of silver nitrate solution, 5 parts of vinyl distearic acid amide, 3 parts of polyoxyethylene abietic acid, and 15 parts of calcium oxide.

[0031] Further, the mass fraction of the silver nitrate solution is 20%.

[0032] Further, the preparation method of the modified nano-silver is as follows: finely grind calcium oxide and pass through a 300-mesh sieve; The esters were mixed and heated to 75°C, ultrasonically dispersed for 45 minutes; the mixture was transferred to an oven and evaporated to dryness, ...

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PUM

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Abstract

The invention discloses a capacitor electrolyte solution with low internal resistance, which comprises lithium salt, organic solvent, ionic liquid and modified nano-silver, and the mass ratio of the lithium salt, organic solvent, ionic liquid and modified nano-silver is (0.5 ~1): (0.8~1.5): (0.3~0.8): (0.005~0.01). The present invention contains high-concentration lithium salts and high ionic liquid content, which can effectively improve the capacity and service life of capacitors; after silver ions are modified, it is beneficial to reduce the internal resistance of electrolyte; silver ions will have Part of it is reduced to a single substance and attached to the gap of the electrode material, thereby greatly reducing the equivalent internal resistance of the electric double layer capacitor.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a capacitor electrolyte with low internal resistance. Background technique [0002] A capacitor is composed of a layer of insulating dielectric sandwiched between two metal electrodes. When a voltage is applied between two metal electrodes, charges are stored on the electrodes, so capacitors are energy storage elements. [0003] Double layer capacitor is a new type of energy storage device, which has the advantages of high power density, high cycle life, and fast charge and discharge performance. It is widely used in military fields, mobile communication devices, computers, and hybrid power supplies for electric vehicles. As an important part of electric double layer capacitors, the electrolyte has a great influence on the storage performance of electric double layer capacitors, which determines the equivalent internal resistance, working voltage range, storage capacity, work...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/58H01G11/62H01G11/64
CPCH01G11/58H01G11/62H01G11/64Y02E60/13
Inventor 许美娜
Owner ANHUI SUREPHON CAPACITOR CO LTD
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