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High temperature electrolyte for super capacitor

A supercapacitor, electrolyte technology, applied in the field of fine chemicals, can solve the problems of use, the electrochemical stability is not strong enough, etc.

Inactive Publication Date: 2007-02-28
锦州凯美能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have shown that the electrochemical stability of these cations is not strong enough that organic solutions of these salts cannot be used at voltages higher than 2.5-2.8V

Method used

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  • High temperature electrolyte for super capacitor
  • High temperature electrolyte for super capacitor
  • High temperature electrolyte for super capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Samples of different masses of N-diethyl-N-methyl-N-(3-ethoxypropionyl)tetrafluoroboric acid were dissolved in 100ml of acetonitrile, γ-butyrolactone or propylene carbonate to form a concentration of 0.5 , 0.75, 1.0, 1.25 and 1.5mol / l solutions, the conductivity values ​​of these solutions measured at 25°C are shown in Figure 1.

Embodiment 2

[0035] Samples of different masses of N-diethyl-N-methyl-N-(3-ethoxypropionyl)tetrafluoroboric acid were dissolved in 100ml of acetonitrile, γ-butyrolactone or propylene carbonate to form a concentration of 1.0 mol / l solution, the conductivity values ​​of these solutions measured in different temperature ranges from 30°C to -30°C or -40°C are shown in Figure 2.

Embodiment 3

[0037] A certain mass of N-diethyl-N-methyl-N-(3-ethoxypropionyl)tetrafluoroboric acid sample was dissolved in 100ml of γ-butyrolactone (80% by volume) and dimethoxyethyl A solution with a concentration of 1.0 mol / l was formed in a mixed solvent of alkanes (20% by volume). The conductivity values ​​of this solution measured at 25°C are listed in Table 1.

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Abstract

The invention relates to a super-capacitor high-temperature electrolyte. Wherein, its solute is N-trialkyl-N-alkoxy acyl fluoroboric acid or phosphorofluoric acid or Fraude's reagent, or trifluoromethyl sulfonic acid; and the solvent is aprotic solvents; its density in room temperature is 0.8-2.0mol / l; the aprotic solvents are acetonitrile, ethyl cyanide, methacrylonitrile, gamma- butyrolactone, gamma- valerolactone, vinylene carbonate, propylene carbonate, N, N- dimethyl formamide, 1- dimethyl formamide-2- pyrrolidone, methylenedioxy ethane, 2-methoxy ether, tetrahydrofuran, dioxolane, dimethyl carbonate, diethyl carbonate, diethyl carbonate, or dimethyl sulfoxide. And the inventive capacitor has high capacity and high service life at 85Deg. C.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a supercapacitor high-temperature electrolyte. Background technique [0002] Organic electrolytes in protic solvents and perchlorates of tetraalkylamines, tetrafluoroborates or hexafluorophosphates are widely used in supercapacitors. Compared with aqueous electrolytes, they have the advantage of relatively high electrochemical stability and therefore relatively high operating voltage. The energy stored in a capacitor is proportional to the square of the voltage: [0003] E=0.5CV 2 (1) [0004] Another advantage of choosing a protic solvent is a wide temperature range, since organic solvents commonly used in supercapacitors are liquids in the temperature range of -50°C to +240°C. However, at such temperatures the solubility of the above-mentioned tetraalkylammonium salts decreases very rapidly with temperature, so that, in practice,...

Claims

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Application Information

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IPC IPC(8): H01G9/035
CPCY02E60/13
Inventor 李文生吴秋菊蔡丹武智惠
Owner 锦州凯美能源有限公司
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