A gel electrolyte and lithium-sulfur secondary battery

A technology of gel electrolyte and liquid electrolyte, applied in the field of electrochemistry, can solve the problems of lithium-sulfur secondary batteries that need to be improved, and achieve the effects of improving charge and discharge efficiency, high capacity retention rate, and increasing the degree of polymerization

Active Publication Date: 2021-11-30
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The comprehensive performance of the battery capacity, capacity retention rate and charge-discharge efficiency of the lithium-sulfur secondary battery in this patent still needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] After preparing liquid electrolyte E1, add 1% of 2-[[2,2-bis[[(1-oxo-2-propenyl]methyl]butoxy]methyl]-2-ethyl- 1,3-propanediyl-2-acrylate (CAS number: 94108-97-1) and 0.05% peroxybenzoic acid initiator to obtain gel electrolyte ES1;

[0055] Injection and cell molding: inject the above-mentioned gel electrolyte ES1 into the baked cell (the preparation of the cell is the same as in Comparative Example 1), and let it stand until the electrolyte soaks the entire diaphragm. After standing at a high temperature of 80°C for 4 hours, then Processes such as chemical formation, shaping, and degassing were carried out to finally obtain the lithium-sulfur battery example BS1.

Embodiment 2

[0057] After preparing according to liquid electrolyte E2, add 1% of 2-[[2,2-bis[[(1-oxo-2-propenyl]methyl]butoxy]methyl]-2-ethyl- 1,3-propanediyl-2-acrylate (CAS No.: 94108-97-1) and 0.05% peroxybenzoic acid initiator to obtain gel electrolyte ES2;

[0058] Liquid injection and cell molding: inject the above-mentioned electrolyte ES2 into the baked cell (the preparation of the cell is the same as that of Comparative Example 1), let it stand until the electrolyte soaks the entire diaphragm, and leave it at a high temperature of 65°C for 6 hours, then proceed to chemical formation , shaping, degassing and other processes to finally obtain the lithium-sulfur battery embodiment BS2.

Embodiment 3

[0060] After preparing liquid electrolyte E1, add 2% of 2-[[2,2-bis[[(1-oxo-2-propenyl]methyl]butoxy]methyl]-2-ethyl- 1,3-Propanediyl-2-acrylate (CAS No.: 94108-97-1) and 0.08% AIBN to obtain gel electrolyte ES3;

[0061] Liquid injection and cell molding: inject the above-mentioned electrolyte ES3 into the baked cell (the preparation of the cell is the same as that of Comparative Example 1), let it stand until the electrolyte soaks the entire diaphragm, and leave it at a high temperature of 80°C for 4 hours, and then perform the formation , shaping, degassing and other processes to finally obtain the lithium-sulfur battery embodiment BS3.

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Abstract

The present invention relates to a gel electrolyte, including a liquid electrolyte, a polymerizable monomolecular organic compound and an initiator, and the polymerizable monomolecular organic compound includes one or more of the substances shown in formula one, formula one: wherein, R 1 , R 2 , R 3 , R 4 are independently selected from alkyl groups, alkyl acrylate groups, ether groups, haloalkyl groups, haloalkyl acrylate groups or haloether groups, and a, b, c, and d are independently selected from numbers between 0 and 5. The gel electrolyte of the present invention can effectively increase the probability of unimolecular reaction and increase the degree of polymerization of the polymer when a polymerization reaction occurs, and the gel electrolyte of the present invention has good electrochemical performance and safety, and the gel electrolyte prepared from this The lithium-sulfur secondary battery can improve the charging and discharging efficiency and capacity retention rate of the battery, and has a higher first-week discharge capacity, and the preparation process of the invention is simple, and it is easy to realize mass production.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a gel electrolyte and a lithium-sulfur secondary battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, high energy density, no memory effect, long cycle life and no pollution. Since its commercialization in 1991, lithium-ion secondary batteries have become the preferred power source for a variety of electronic products. However, as electric bicycles, electric vehicles, and large-scale energy storage power stations enter the stage of large-scale development and application, higher specific capacity requirements are put forward for lithium-ion secondary batteries. At this stage, the low capacity of positive and negative materials for lithium-ion secondary batteries (actual specific capacity of positive material <300 mAh / g; specific capacity of negative material <400 mAh / g) has become the main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCY02E60/10
Inventor 秦虎袁杰陈黎吴钦周科甘朝伦
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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