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Organic electrolyte and preparing method thereof

An organic electrolyte, organic electrolyte technology, applied in the fields of material science and electrochemistry, can solve the problems of unfavorable commercial application of organic solvents, low ionic conductivity, low working voltage, etc., to improve electrochemical cycle stability, high dielectric Electric constant, the effect of reducing internal resistance

Inactive Publication Date: 2008-04-16
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] People such as Fujimoto have proposed a kind of organic solvent that contains 20%~80% vinylene carbonate in U.S. Patent US5352548, in order to improve the low-temperature discharge performance of lithium secondary battery, but because vinylene carbonate is expensive, so this Organic solvents are not conducive to commercial application
[0012] From the above analysis, although some organic electrolytes have relatively stable working voltage and excellent chemical stability, they still have low ionic conductivity, large internal resistance, low working voltage ( 3.0V), high ionic conductivity and small internal resistance has become the current improvement of the energy density and power density of supercapacitors, as well as the realization in the energy field and An effective path for widespread commercial application of electric vehicle powertrains

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, place the ethylene carbonate in a glass container, and slowly heat it to 50°C under nitrogen protection until it melts completely. Dimethyl sulfoxide, propylene carbonate and ethylene carbonate are configured as an organic solvent in a ratio of 80:10:10, placed in a glass container, and stirred with a two-way magnetic heating stirrer to obtain a uniform organic solvent; then lithium hexafluorophosphate, According to the concentration of 0.5mol / L (based on the configured organic solvent), add it into the glass container containing the prepared organic solvent after weighing, and continue to stir to dissolve the electrolyte; then tetrapropyl ammonium tetrafluoroborate, according to 0.5mol / L concentration (based on the configured organic solvent), weighed and added to the glass container containing the prepared organic solvent, stirred for 30 minutes, so that the electrolyte was evenly dissolved in the organic solvent to form a uniform organic solvent containing ele...

Embodiment 2

[0031] First, place the ethylene carbonate in a glass container, and slowly heat it to 90°C under nitrogen protection until it melts completely. Sulfolane, dimethyl carbonate, ethyl methyl carbonate and ethylene carbonate are configured into an organic solvent in a ratio of 40:30:20:10, placed in a glass container, and stirred with a two-way magnetic heating stirrer to obtain a uniform organic solvent; Then lithium hexafluorophosphate and lithium iodide were weighed at concentrations of 0.01 mol / L and 0.5 mol / L (based on the prepared organic solvent), respectively, and added to the glass container containing the prepared organic solvent, and continued stirring to dissolve the electrolyte Then tetraethylamine tetrafluoroborate, according to the concentration of 1.0mol / L (based on the configured organic solvent), weighed and added to the glass container containing the prepared organic solvent, stirred for 60min, so that the electrolyte was evenly dissolved in In the organic solv...

Embodiment 3

[0033] First, place the ethylene carbonate in a glass container, and slowly heat it to 70°C under nitrogen protection until it melts completely. Dimethyl sulfoxide, dimethyl carbonate, dimethyl ethyl carbonate and ethylene carbonate were configured as an organic solvent in a ratio of 60:20:10:10, placed in a glass container, and stirred with a two-way magnetic heating stirrer to obtain a uniform organic solvent; then lithium perchlorate and lithium hexafluorophosphate, all according to the concentration of 0.5mol / L (based on the configured organic solvent), weighed and added to the glass container containing the prepared organic solvent, and continued stirring to dissolve the electrolyte ; Then N-N-tetramethylenepyrrolidine ammonium tetrafluoroborate, according to the concentration of 1.0mol / L (based on the configured organic solvent), weighed and then added to the glass container containing the prepared organic solvent, stirred for 120min, The electrolyte is uniformly dissolv...

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Abstract

The organic electrolyte is composed of the inorganic electrolyte, the organic electrolyte, the organic solvent and the poly component additive. The organic electrolyte the the inorganic electrolyte are dissociated in the organic solvent to supply the cation and anion. The organic solvent is the dimethyl sulfoxide innocuous organic compound of higher decomposition voltage. The poly component additive decreases the viscosity and internal resistance of the organic solvent, and improves the electrochemical stability and safety of the organic electrolyte. Thus the density of energy and power of the super-capacitor is improved.

Description

technical field [0001] The invention relates to an organic electrolytic solution for a supercapacitor and a preparation method thereof, which belong to the field of material science, especially the field of electrochemical technology. technical background [0002] A supercapacitor is a new type of energy device between a rechargeable battery and a capacitor. It has the dual functions of a capacitor and a battery. In comparison, supercapacitors have the advantages of small size, large capacity, fast charging speed, long cycle life, high discharge efficiency, wide operating temperature range, good reliability, pollution-free and maintenance-free, and are a new, efficient and practical energy Therefore, it has very broad application prospects in the fields of electric power, railway, transportation, medical treatment, military industry, communication, etc., such as: (1) backup power in data storage systems and portable electronic devices; (2) low-power consumption instruments ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/038H01G9/035H01M10/40H01G9/022H01G11/58
CPCY02E60/122Y02E60/13
Inventor 谭强强齐智平童建忠
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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