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Flame-retardant gel electrolyte, preparation method and application of flame-retardant gel electrolyte in lithium ion battery and supercapacitor

A gel electrolyte and electrolyte technology, applied in solid electrolytes, non-aqueous electrolytes, hybrid capacitor electrolytes, etc., can solve the problem of reducing the capacity and performance of lithium-ion batteries and supercapacitors, reducing the ionic conductivity and electrochemical stability of electrolytes , electrolyte leakage and other problems, to achieve the effect of reducing the possibility of electrolyte leakage, simple preparation method and increasing viscosity

Active Publication Date: 2018-09-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of flame retardants will reduce the ionic conductivity and electrochemical stability of the electrolyte, further reducing the capacity and performance of lithium-ion batteries and supercapacitors; at the same time, even if flame retardants are added, the electrolyte is still liquid form, there are difficulties in packaging and the risk of electrolyte leakage, which is not conducive to the development of batteries and supercapacitors in the direction of flexibility and wearable devices

Method used

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  • Flame-retardant gel electrolyte, preparation method and application of flame-retardant gel electrolyte in lithium ion battery and supercapacitor
  • Flame-retardant gel electrolyte, preparation method and application of flame-retardant gel electrolyte in lithium ion battery and supercapacitor
  • Flame-retardant gel electrolyte, preparation method and application of flame-retardant gel electrolyte in lithium ion battery and supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: The molecular chain structure is composed of tetrabromobisphenol A and polyethylene glycol diglycidyl ether (M n =500) Preparation of No. 1 flame-retardant polymer

[0032] 1) Under room temperature and nitrogen atmosphere, add 5g of polyethylene glycol diglycidyl ether with a number average molecular weight of 500 and 5.34g of tetrabromobisphenol A into a two-necked flask reaction vessel with mechanical stirring, and heat to 60 degrees , Stir thoroughly until the reactants are completely dissolved;

[0033] 2) Continue to heat up to 100 degrees, react for 10 hours, until a viscous clear liquid is formed, and cool to room temperature to obtain 10.34g of No. 1 flame-retardant polymer.

Embodiment 2

[0034] Example 2: The molecular chain structure is composed of tetrabromobisphenol A, tetrabromobisphenol A (bis-2-hydroxyethyl) ether and polyethylene glycol diglycidyl ether (M n =2000) Preparation of No. 2 flame-retardant polymer

[0035] Change 5g polyethylene glycol diglycidyl ether with a number average molecular weight of 500 in step 1) of Example 1 to 10g polyethylene glycol diglycidyl ether with a number average molecular weight of 2000, and 5.34g tetrabromobisphenol A Change to 1.34g tetrabromobisphenol A, 1.58g tetrabromobisphenol A (bis-2-hydroxyethyl) ether; the temperature in step 2) is changed from 100 degrees to 110 degrees, and the rest of the steps are as described in Example 1. 12.92g of No. 2 flame-retardant polymer was obtained.

Embodiment 3

[0036] Example 3: Preparation of No. 1 flame retardant gel electrolyte

[0037] 1) In an argon glove box, add 1 g of ethylene carbonate and 1 g of propylene carbonate to the container, and stir uniformly to obtain a mixed organic solvent;

[0038] 2) Weigh 2g of lithium hexafluorophosphate and add it to step 1) Mixed organic solvent, stir until the lithium salt is completely dissolved, then add 6g of the No. 1 flame-retardant polymer prepared in Example 1, and stir until the flame-retardant polymer is completely dissolved and a clear viscous is obtained Like a gel liquid, the No. 1 flame-retardant gel electrolyte was prepared.

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Abstract

The invention relates to an organic flame-retardant gel electrolyte, a preparation method and an application of the flame-retardant gel electrolyte in a lithium ion battery and a supercapacitor, and belongs to the technical field of electrolyte preparation. The gel electrolyte comprises the following components in parts by mass: 1 part of organic solvent, 0.1 to 1 part of electrolyte lithium saltand 0.1 to 3 parts of flame-retardant macromolecules. The flame-retardant macromolecules are obtained through heating open-loop polymerization reaction of tetrabromobisphenol A or tetrabromobisphenolA (bis(2-hydroxyethyl)ether) with a flame-retardant function and polyethylene glycol diglycidyl ether with a lithium ion conduction function and the number-average molecular weight being 500, 2000 or6000, and a reaction molar ratio is 1 to 1. The gel electrolyte prepared by the method has a better flame-retardant effect and ionic conductivity comparable to that of a liquid organic electrolyte, the electrolyte is gelled through the addition of the flame-retardant macromolecules, and the risk of electrolyte leakage is reduced, so that the use safety of the lithium ion battery and the supercapacitor is greatly improved, and the application prospect is wide.

Description

Technical field [0001] The invention belongs to the technical field of electrolyte preparation, and specifically relates to a novel flame-retardant gel electrolyte and a preparation method. The flame-retardant gel electrolyte can be used in lithium ion batteries and supercapacitors. Background technique [0002] In recent years, with the improvement of people's living standards, people's demand for electronic products has gradually increased, and the quality requirements have gradually become higher, and there is a trend of development in the direction of wearable products. The development of electrochemical energy storage devices used in electronic products, such as lithium-ion batteries and supercapacitors, has become a research hotspot in today's society. Lithium-ion batteries and supercapacitors are usually composed of three parts: electrode, electrolyte and diaphragm. Electrolyte, as one of its most important components, not only plays the role of ion transmission between el...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01G11/56
CPCH01G11/56H01M10/0525H01M10/0565H01M2300/0082Y02E60/10Y02E60/13
Inventor 王贵宾那睿琦鲁楠栾加双张淑玲张梅
Owner JILIN UNIV
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