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A kind of mixed salt electrolyte and its application for high voltage supercapacitor

A technology of supercapacitors and mixed salts, applied in the field of electrochemistry, to achieve the effects of improving discharge capacity, reducing costs, and absorbing multiple ions

Active Publication Date: 2020-10-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the practical application of existing high-voltage supercapacitors, the present invention provides a mixed salt electrolyte for high-voltage supercapacitors and its application

Method used

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  • A kind of mixed salt electrolyte and its application for high voltage supercapacitor
  • A kind of mixed salt electrolyte and its application for high voltage supercapacitor
  • A kind of mixed salt electrolyte and its application for high voltage supercapacitor

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preparation example Construction

[0034] The present invention has no special restrictions on the preparation methods of electrodes and supercapacitors, as long as the battery preparation method is well known to those skilled in the art, the specific steps are preferably: the electrode active material and the conductive binder polytetrafluoroethylene acetylene black are in accordance with the mass ratio It is mixed at a ratio of 2:1 and pressed on an aluminum mesh current collector to prepare electrodes. The mass ratio of positive and negative electrodes is 1:1; the above-mentioned mixed salt electrolyte is prepared in a glove box filled with a protective atmosphere, and the activated non-porous soft The carbon negative electrode, graphite positive electrode, separator and the above mixed salt electrolyte are assembled into a super capacitor.

[0035] Charge and discharge the supercapacitor provided by the present invention to characterize the capacity and cycle performance of the capacitor using mixed salt electr...

Embodiment 1

[0039] Prepare a mixed salt propylene carbonate solution in the glove box, in which the solutes are triethylmethylammonium hexafluorophosphate and sodium hexafluorophosphate, the concentration of triethylmethylammonium hexafluorophosphate is 1.9mol / L, The concentration of sodium hexafluorophosphate is 0.1 mol / L. Using the above solution as the electrolyte, a supercapacitor is made in a glove box, wherein the negative electrode is mesocarbon microspheres activated by potassium hydroxide, the positive electrode is graphite, and the separator is glass fiber. After leaving the capacitor for 12 hours, perform a constant current charge-discharge cycle test with a maximum cut-off voltage of 4V.

[0040] figure 1 Is the charge-discharge curve diagram of the capacitor prepared in Example 1 for some cycles, which is represented by figure 1 It can be seen that the first lap is different from the electrochemical activation process of the subsequent cycle, and the electrolyte has good compati...

Embodiment 2

[0042] Prepare a mixed salt propylene carbonate solution in the glove box, where the solutes are triethylmethylammonium hexafluorophosphate and sodium hexafluorophosphate, the concentration of triethylmethylammonium hexafluorophosphate is 1.8mol / L, The concentration of sodium hexafluorophosphate is 0.2mol / L. Using the above solution as the electrolyte, a supercapacitor is made in a glove box, wherein the negative electrode is mesocarbon microspheres activated by potassium hydroxide, the positive electrode is graphite, and the separator is glass fiber. After the capacitor is allowed to stand for 12 hours, a constant current charge-discharge cycle test with a maximum cut-off voltage of 4V is performed.

[0043] figure 2 Is the charge-discharge curve diagram of the capacitor prepared in Example 2 for certain cycles, which is represented by figure 2 It can be seen that the first lap is different from the electrochemical activation process in the subsequent cycle, and the electrolyt...

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Abstract

The invention relates to a mixed salt electrolyte for a high-voltage supercapacitor and an application thereof, and belongs to the field of electrochemistry. The mixed salt electrolyte comprises a solute and an organic solvent, wherein the solute includes quaternary ammonium salt and sodium salt, the quaternary ammonium salt is triethyl methyl ammonium hexafluorophosphate or tetraethyl ammonium hexafluorophosphate, and the sodium salt is sodium hexafluorophosphate; and the organic solvent is propylene carbonate. According to the invention, the mixed salt electrolyte is applied to a nonporous soft carbon / graphite supercapacitor and has good compatibility with the supercapacitor, the highest working voltage of the supercapacitor can reach 4V, and the supercapacitor can stably output a specific capacity of about 50mAh g<-1> after hundreds of cycles. The mixed salt electrolyte not only improves the discharge capacity of the supercapacitor, but also reduces the cost of the electrolyte. Meanwhile, as the size of sodium ions is small and the salvation degree is low, more ion adsorption can be realized in the subsequent cycles under the premise of ensuring good electrochemical activation of quaternary ammonium salt cations to the negative electrode in the first cycle, and thus the total capacity is improved.

Description

Technical field [0001] The invention belongs to the field of electrochemistry technology, and specifically relates to a mixed salt electrolyte for high-voltage supercapacitors and applications thereof. Background technique [0002] In recent years, the increasing attention of mankind to environmental issues has promoted the development of renewable energy. As an electrochemical energy storage device, supercapacitors have attracted wide attention for their advantages such as fast charging speed, long cycle life, and low environmental pollution. At present, it has gradually obtained applications in the fields of transportation, communications, and national defense, and will play a more important role in the future energy field. [0003] The super capacitor is composed of a positive electrode, a negative electrode, an electrolyte and a separator between the two electrodes. The most common organic supercapacitors generally use porous carbon as the positive and negative electrode mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/60H01G11/62
CPCH01G11/60H01G11/62Y02E60/13
Inventor 王宏宇李家玉齐力
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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