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Electrolyte for double-electric-layer capacitor

An electric double-layer capacitor and electrolyte technology, applied in the field of electrochemistry, can solve the problems of high viscosity, large equivalent internal resistance of electric double-layer capacitors, and low affinity.

Inactive Publication Date: 2014-01-15
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pyrroline-based ionic liquids are one of the newly developed ionic liquid electrolytes. However, pyrroline-based ionic liquids have high viscosity and low affinity with PP (polypropylene), PE (polyethylene), etc., making pure pyrroline-based ionic liquids The equivalent internal resistance of electric double layer capacitors with ionic liquid as electrolyte is too large

Method used

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  • Electrolyte for double-electric-layer capacitor
  • Electrolyte for double-electric-layer capacitor
  • Electrolyte for double-electric-layer capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the glove box, the molar ratio is 1:0.04, that is, methylethylpyrroline tetrafluoroborate and tridecyl alcohol polyoxyethylene ether are mixed with the molar ratio of 5mol and 0.2mol, and after stirring for 30 minutes, thirteen Alcohol polyoxyethylene ether is uniformly dispersed in methyl ethyl pyrroline tetrafluoroborate to obtain electrolyte solution for electric double layer capacitor.

[0022] figure 1 In order to adopt the electric double layer capacitor (the diaphragm of this capacitor is made of PP material) and the pure ionic liquid methyl ethylpyrroline tetrafluoroborate as the electrolytic solution for the electric double layer capacitor obtained in Example 1 The AC impedance spectrum of the electric double-layer capacitor in the electrolyte; where the abscissa is the real part, and the ordinate is the imaginary part (the data measured by the AC impedance is a complex number obtained through mathematical model processing, and the AC impedance spectrum is a...

Embodiment 2-20

[0024] Embodiment 2-20 sees following form:

[0025]

[0026]

[0027] Note: In the table,

[0028] 1. A stands for ionic liquid, B stands for high-carbon fatty alcohol polyoxyethylene ether; A:B stands for the respective moles of A and B, for example, A:B is 2:0.08, which means that the moles of A is 2mol, and that of B The number of moles is 0.08mol;

[0029] 2. The reduction ratio of the equivalent internal resistance is the ratio of the equivalent internal resistance of the electric double layer capacitor using the electrolyte of this embodiment measured under the same conditions in the corresponding embodiment without adding high-carbon aliphatic alcohol polyoxyethylene ether The percentage reduction of the equivalent internal resistance of the ionic liquid electric double layer capacitor;

[0030] 3. In Examples 2 to 20, various preparation processes and test conditions are the same as in Example 1.

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Abstract

The invention belongs to the field of electrochemistry, and discloses an electrolyte for a double-electric-layer capacitor. The electrolyte for the double-electric-layer capacitor comprises pyrroline ionic liquid and high-carbon fatty alcohol polyoxyethylene ether, and the molar ratio of the pyrroline ionic liquid and the high-carbon fatty alcohol polyoxyethylene ether is 1:0.001-1:0.05. According to the electrolyte for the double-electric-layer capacitor, the affinity of the pyrroline ionic liquid and the diaphragm materials such as PP and PE is small due to high viscosity and large surface tension of the pyrroline ionic liquid, so that the equivalent internal resistance of the double-electric-layer capacitor with the pure pyrroline ionic liquid being used as the electrolyte is large, after the high-carbon fatty alcohol polyoxyethylene ether is added in the pyrroline ionic liquid, due to the fact that the high-carbon fatty alcohol polyoxyethylene ether is a nonionic surface active agent, the affinity of the pyrroline ionic liquid and the diaphragm materials such as the PP and the PE commonly used for capacitors can be increased, and the equivalent internal resistance of the double-electric-layer capacitor is greatly lowered. Therefore, the equivalent internal resistance of the double-electric-layer capacitor is greatly lowered.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an electrolyte solution for an electric double layer capacitor. Background technique [0002] Electric 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, working temperature and working environment of the capacitor. [0003] Ionic liquids are organic liquid substances composed entirely of ions at or near room temperature. As a new type of electrolyte, the emergence of ionic liquids has g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/64
CPCY02E60/13
Inventor 周明杰邓惠仁王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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