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Gel electrolyte and lithium-sulfur secondary battery

A technology of gel electrolyte and liquid electrolyte, which is applied in the field of electrochemistry, can solve the problems that lithium-sulfur secondary batteries need to be improved, and achieve the effects of improving charge and discharge efficiency, good electrochemical performance and safety, and simple preparation process

Active Publication Date: 2019-06-11
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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  • Gel electrolyte and lithium-sulfur secondary battery
  • Gel electrolyte and lithium-sulfur secondary battery

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 No.: 94108-97-1) and 0.05% peroxybenzoic acid initiator to obtain gel electrolyte ES1;

[0055] Liquid 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 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 in 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 before performing the 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 before performing the formation , shaping, degassing and other processes to finally obtain the lithium-sulfur battery embodiment BS3.

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Abstract

The invention relates to a gel electrolyte. The gel electrolyte comprises a liquid electrolyte, polymerizable monomolecular organic matters and an initiator, wherein the polymerizable monomolecular organic matters comprise one or more of the substances shown in the formula I which is as shown in the specification, wherein R1, R2, R3 and R4 are independently selected from an alkyl group, an alkyl acrylate group, an ether group, a halogenated alkyl group, a halogenated alkyl acrylate group or a halogenated ether group, and a, b, c and d are independently selected from the numbers between 0 and 5. According to the gel electrolyte disclosed by the invention, the probability of single molecule reaction can be effectively increased when the polymerization reaction occurs, the polymerization degree of the polymer is improved, and the gel electrolyte disclosed by the invention has high electrochemical performance and safety; when a lithium-sulfur secondary battery is prepared from the gel electrolyte, the charging and discharging efficiency and the capacity retention rate of the battery can be improved, and relatively high initial cycle discharge capacity can be achieved; and moreover, thepreparation process is simple, and large-scale production is easy to realize.

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 electrode materials for lithium-ion secondary batteries (the actual specific capacity of positive electrode materials <300mAh / g; the specific capacity of negative electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(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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