Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting multiple layers of modified diaphragms

A lithium-sulfur battery and diaphragm technology, applied in the field of electrochemistry, can solve the problems of high price, unfavorable large-scale production, and high cost, and achieve the effects of reducing battery cost, facilitating large-scale production, and improving production efficiency

Active Publication Date: 2016-04-13
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organometallic frame materials also have problems such as high price and high cost, which are not conducive to mass production.

Method used

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  • Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting multiple layers of modified diaphragms
  • Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting multiple layers of modified diaphragms
  • Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting multiple layers of modified diaphragms

Examples

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Effect test

Embodiment 1

[0045] A preparation method of a modified diaphragm for lithium-sulfur batteries of the present invention, a modified diaphragm and an embodiment of a lithium-sulfur battery having the modified diaphragm:

[0046] Preparation of modified diaphragm: Ketjen black (EC600JD) and polyvinylidene fluoride were uniformly mixed at a mass ratio of 1.5:1, and dispersed in N-methylpyrrolidone solvent. Mechanically stirred for 12 hours to obtain a uniformly dispersed coating material. The uniformly dispersed slurry was coated on the surface of the polypropylene diaphragm by doctor blade coating. The coated separator was put into a vacuum drying oven, and dried at 50° C. for 6 hours to obtain a modified separator.

[0047] Lithium-sulfur battery assembly: the carbon-sulfur composite material is used to prepare the sulfur positive electrode, the metal lithium sheet is used as the negative electrode, and a layer of modified diaphragm prepared in the above steps is assembled into a button bat...

Embodiment 2

[0051] A preparation method of a modified separator for lithium-sulfur batteries of the present invention, a modified separator and an embodiment of a lithium-sulfur battery having multiple layers of the modified separator:

[0052] Preparation of modified diaphragm: Ketjen black (EC600JD) and polyvinylidene fluoride were uniformly mixed at a mass ratio of 1.5:1, and dispersed in N-methylpyrrolidone solvent. Mechanically stirred for 12 hours to obtain a uniformly dispersed coating material. The uniformly dispersed slurry was coated on the surface of the polypropylene diaphragm by doctor blade coating. The coated separator was put into a vacuum drying oven, and dried at 50° C. for 6 hours to obtain a modified separator.

[0053] Lithium-sulfur battery assembly: the carbon-sulfur composite material is used to prepare the sulfur positive electrode, the metal lithium sheet is used as the negative electrode, and two layers of the modified diaphragm prepared in the above steps are ...

Embodiment 3

[0056] A preparation method of a modified separator for lithium-sulfur batteries of the present invention, a modified separator and an embodiment of a lithium-sulfur battery having multiple layers of the modified separator:

[0057] Preparation of modified diaphragm: Ketjen black (EC600JD) and polyvinylidene fluoride were uniformly mixed at a mass ratio of 1.5:1, and dispersed in N-methylpyrrolidone solvent. Mechanically stirred for 12 hours to obtain a uniformly dispersed coating material. The uniformly dispersed slurry was coated on the surface of the polypropylene diaphragm by doctor blade coating. The coated separator was put into a vacuum drying oven, and dried at 50° C. for 6 hours to obtain a modified separator.

[0058] Lithium-sulfur battery assembly: the carbon-sulfur composite material is used to prepare the sulfur positive electrode, the metal lithium sheet is used as the negative electrode, and the three-layer modified diaphragm prepared in the above steps is ass...

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Abstract

The invention discloses a preparation method for a modified diaphragm for a lithium-sulfur battery, the modified diaphragm and the lithium-sulfur battery adopting multiple layers of the modified diaphragms. The preparation method comprises the following steps of only uniformly mixing a conductive agent with a binder at the mass ratio of 1:1-5:1, then scattering the mixture into solvent; performing mechanical stirring or ultrasonic scattering to obtain uniformly-dispersed coating slurry; coating the surface of a diaphragm substrate with the obtained coating slurry, and performing vacuum drying to obtain the modified diaphragm for the lithium-sulfur battery. The lithium-sulfur battery adopting multiple layers of the modified diaphragms prepared by the method is good in electrochemical performance, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a modified separator for a lithium-sulfur battery, a modified separator and a lithium-sulfur battery with multiple layers of the modified separator. Background technique [0002] In recent years, lithium-sulfur batteries have attracted more and more attention as an advanced lithium-ion battery. This is due to the high theoretical specific energy density (2600Wh / Kg) of lithium-sulfur batteries, and the low price and environmental friendliness of sulfur cathodes. [0003] However, the most serious problem of lithium-sulfur batteries at present is that the polysulfides produced during charging and discharging dissolve in the electrolyte and diffuse repeatedly between the positive and negative electrodes, that is, the "shuttle effect". The "shuttle effect" will lead to a decrease in the discharge specific capacity of lithium-sulfur batter...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/058H01M50/403H01M50/449H01M50/451
CPCH01M10/058H01M50/431H01M50/44H01M50/40H01M50/403Y02E60/10Y02P70/50
Inventor 姚山山唐豪沈湘黔吴潇侯金利钱昕晔饶德伟廖达前习小明覃事彪
Owner CHANGSHA RES INST OF MINING & METALLURGY
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