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Reversible overheating self-protection organic electrolyte based on cyclodextrin supramolecular gel system and preparation method of reversible overheating self-protection organic electrolyte

A technology of organic electrolyte and supramolecular gel, which is applied in the manufacture of electrolytic capacitors, electrolytic capacitors, circuits, etc., can solve the problems of narrow electrochemical stability window and inability to apply safety problems, and achieve the effect of simple and easy preparation method

Active Publication Date: 2021-11-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these polymer systems have significant overheating self-protection capabilities, they are only suitable for aqueous electrolytes, so the electrochemical stability window is narrow, and they cannot be applied to organic electrochemical energy storage devices with more serious safety problems.
So far, it is still a great challenge to develop a reversible overheating self-protection electrolyte system for organic electrochemical energy storage devices.

Method used

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  • Reversible overheating self-protection organic electrolyte based on cyclodextrin supramolecular gel system and preparation method of reversible overheating self-protection organic electrolyte
  • Reversible overheating self-protection organic electrolyte based on cyclodextrin supramolecular gel system and preparation method of reversible overheating self-protection organic electrolyte
  • Reversible overheating self-protection organic electrolyte based on cyclodextrin supramolecular gel system and preparation method of reversible overheating self-protection organic electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, the preparation steps of the reversible overheating self-protection organic electrolyte based on the cyclodextrin supramolecular gel system are as follows:

[0025] Step 1, take 0.28g of lithium chloride and completely dissolve it in 15mL of N,N-dimethylformamide to obtain a lithium salt solution;

[0026] Step 2: Add 5.1g of β-cyclodextrin and 3.05g of diphenylamine to the above lithium chloride solution in an environment of 25°C, and keep stirring until completely dissolved, that is, a reversible superheated autogenous gel system based on cyclodextrin is obtained. Protect the organic electrolyte.

Embodiment 2

[0036] In this example, the preparation steps of the reversible overheating self-protection organic electrolyte based on the cyclodextrin supramolecular gel system are as follows:

[0037] Step 1, take 0.28g of lithium chloride and completely dissolve it in 15mL of N,N-dimethylformamide to obtain a lithium salt solution;

[0038] Step 2: Add 2.55g of β-cyclodextrin and 1.52g of diphenylamine to the above lithium chloride solution in an environment of 25°C, and keep stirring until completely dissolved, that is, a reversible superheated autogenous gel system based on cyclodextrin is obtained. Protect the organic electrolyte.

[0039]After testing, the organic electrolyte based on the cyclodextrin supramolecular gel system prepared in this example also showed obvious temperature-sensitive gelation behavior and an intelligent reversible overheating self-protection function of working at normal temperature and shutting down at high temperature. However, the corresponding blank gro...

Embodiment 3

[0041] In this example, the preparation steps of the reversible overheating self-protection organic electrolyte based on the cyclodextrin supramolecular gel system are as follows:

[0042] Step 1, take 0.32g of lithium hydroxide and completely dissolve it in 15mL of N,N-dimethylacetamide to obtain a lithium salt solution;

[0043] Step 2: Add 3.65g of α-cyclodextrin and 2.36g of toluene to the above lithium hydroxide solution in an environment of 25°C, and keep stirring until completely dissolved to obtain a reversible overheating self-protection based on cyclodextrin supramolecular gel system organic electrolyte.

[0044] After testing, the organic electrolyte based on the cyclodextrin supramolecular gel system prepared in this example also showed obvious temperature-sensitive gelation behavior and an intelligent reversible overheating self-protection function of working at normal temperature and shutting down at high temperature. However, the corresponding blank group organ...

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Abstract

The invention discloses a reversible overheating self-protection organic electrolyte based on a cyclodextrin supramolecular gel system and a preparation method of the reversible overheating self-protection organic electrolyte. The organic electrolyte consists of an organic solvent, cyclodextrin, lithium salt and benzene-containing structure object micromolecules. According to the organic electrolyte, intelligent reversible overheating protection of normal-temperature working and high-temperature closing is achieved by means of self-assembly of subjects and objects among molecules of all the components of the organic electrolyte and the temperature-sensitive characteristic of hydrogen bond acting force, and the preparation method of the organic electrolyte is simple.

Description

technical field [0001] The invention relates to the field of overheat self-protection of electrochemical energy storage devices, and more specifically relates to a reversible overheat self-protection organic electrolyte based on a cyclodextrin supramolecular gel system and a preparation method thereof. Background technique [0002] In recent years, mainstream electrochemical energy storage devices such as lithium-ion batteries and supercapacitors have been developing rapidly towards high energy density, high power density and long cycle life. At the same time, the subsequent thermal runaway of electrochemical energy storage devices has attracted more and more people's attention. Most commonly, when operating at high power and high current density, high-performance electrochemical energy storage devices are prone to generate and accumulate a large amount of heat inside, resulting in a sharp increase in the internal pressure of the device, causing serious safety hazards such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/00C08B37/16
CPCH01G9/035H01G9/0029C08B37/0015Y02E60/10
Inventor 石琨许争杰杨则恒张卫新
Owner HEFEI UNIV OF TECH
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