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A kind of aqueous electrolyte and its application

A water-based electrolyte and electrolyte technology, applied in the field of electrochemical energy storage, can solve problems such as poor interface compatibility, high cost, and poor low temperature performance, and achieve the effect of improving electrochemical performance and application range

Active Publication Date: 2021-06-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as high cost, poor interface compatibility, high pressure resistance, and poor low temperature performance.

Method used

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  • A kind of aqueous electrolyte and its application
  • A kind of aqueous electrolyte and its application
  • A kind of aqueous electrolyte and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this case, the water-based electrolyte of this example is a solvent water, and the water molecule functional solute in the limit is a potassium nitrite, and the electrolyte is sodium nitrate. The preparation method is as follows: according to weight ratio water / nitrite / sodium nitrate = 1 / 3 / 0.1 Those each component is weighed in water, that is, the aqueous electrolyte of this example is obtained. Among them, the mass fraction of potassium nitrite accounts for 73.2%. The test of the water-based electrolyte prepared by the three electrode linear voltammetry is used to test the electrochemical window of the electrochemical window. With the saturated glycomnet electrodes, the platinum disc electrode is used for the electrode and the working electrode, and the ambient method is measured by linear scanning voltammetry. The electrochemical stability window of the water-based electrolyte reaches 2.7V, which is stable at -40 ° C.

[0038] The aqueous electrolyte of this exam...

Embodiment 2

[0040] In this example, the water-based electrolyte is a solvent water, and the water molecule functional solute in the limits is potassium nitrite, and the electrolyte is potassium nitrate. The preparation method is as follows: according to weight ratio water / nitrite / potassium nitrate = 1 / 3 / 0.1 Those each component is weighed in water, that is, the aqueous electrolyte of this example is obtained. Among them, the mass fraction of potassium nitrite accounts for 73.2%. The water-based electrolyte prepared by the three electrode linear voltammetry was used to test the electrochemical window of the electrochemical window, and the electrochemical stability window of the water electrolyte reached 2.9V, which was able to stabilize at -40 ° C.

[0041]The water-based electrolyte of this example is used in the water-based potassium ion supercapacitor, the positive electrode and the negative electrode are k 2 Fefe (CN) 6 And commercial activated carbon, the positive and negative elect...

Embodiment 3

[0043] In this case, the water-based electrolyte is specifically a solvent water, the water molecule functional solute in the limit is potassium nitrite, and the electrolyte is potassium hydroxide, and the preparation method thereof is as follows: according to weight ratio water / nitrite / potassium hydroxide = 1 / 3 / 0.3 Adjust each component, dissolve in the water, i.e., the aqueous electrolyte of this example. Among them, the mass fraction of potassium nitrite accounts for 69.7%. The electrochemical window of the electrochemical window prepared by the three electrode linear voltammetry is used, and the electrochemical stability window of the water-based electrolyte reaches 2.8 V, which is capable of stabilizing at -40 ° C.

[0044] The aqueous electrolyte of this example is used in aqueous symmetric duplexer supercapacitor, and the positive electrode and negative electrodes are commercially available activated carbon, and the positive and negative electrode is mixed by the activ...

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Abstract

The invention discloses an aqueous electrolytic solution, which includes a water molecule-confined functional solute, water and an electrolyte; The mass percentage in the electrolyte is more than 50%; the electrolyte is a soluble salt or a soluble hydroxide of an alkali metal and / or an alkaline earth metal. The aqueous electrolyte has a high-voltage window and a wide operating temperature range, and is suitable for high-voltage and low-temperature resistant aqueous hybrid supercapacitors. The invention also discloses the application of the water-based electrolyte and an electrochemical energy storage device containing the water-based electrolyte.

Description

Technical field [0001] The present invention relates to the field of electrochemical energy storage. More specifically, it is related to aqueous electrolyte and its application thereof. Background technique [0002] Supercapacitor is an electrochemical energy storage device between conventional capacitors and secondary batteries that have extensive applications in intelligent instruments, new energy vehicles, military high-power power supplies. The supercapacitor has an ultra-high power density, which is more than ten times more than the secondary battery; there is a long life, which can reach more than 500,000 cycle life and more than ten years of calendar life; but the supercapacitor also has energy density. Low disadvantages restrict its development and application. In order to improve the energy storage density of the supercapacitor, the researchers usually work from the development of high-proportional electrode materials and the work voltage of the lifting device. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/62
CPCH01G11/62Y02E60/13
Inventor 薛面起毕海波
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI