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Lithium-sulfur battery diaphragm, preparation method thereof and lithium-sulfur battery

A lithium-sulfur battery and diaphragm technology, applied in the field of lithium-sulfur battery diaphragm and its preparation, can solve the problem of not being able to block polysulfide ions, and achieve the effects of avoiding shuttle effect, avoiding expansion failure, and improving Coulombic efficiency

Pending Publication Date: 2020-11-13
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new lithium-sulfur battery separator that can inhibit the stripping and shuttling of polysulfides in view of the problem that the traditional separators in the prior art cannot block polysulfide ions

Method used

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  • Lithium-sulfur battery diaphragm, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery diaphragm, preparation method thereof and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 45g graphene to 1000g dimethylacetamide, stir at high speed for 30min; add 250g concentration afterwards and be the polym-phenylene isophthalamide solution of 20wt.%, mix and stir for 120min, stir to get final product The coating slurry of polym-phenylene isophthalamide doped with graphene, that is, the first coating slurry.

[0036] (2) Add 200g of isopropanol to 800g of water, mix well, as a solvent for dissolving the polymer, then add 30g of BYK-151 dispersant to it, after stirring for 10min, add 500g of polyvinylidene fluoride, mix and stir for 60min; Add 10 g of sodium carboxymethyl cellulose, mix and stir for 120 min, and stir evenly to obtain polyvinylidene fluoride coating slurry.

[0037] (3) Coat the first coating slurry obtained in step (1) on the positive electrode side of a polyethylene support film with a thickness of 12 μm, and the coating method adopts a microgravure transfer method.

[0038] (4) Using a mixed solution of dimethylacetamide and w...

Embodiment 2

[0043](1) Add 30 g of carbon nanotubes to 750 g of dimethylacetamide, stir at high speed for 50 min; then add 500 g of poly-p-phenylene terephthalamide solution with a concentration of 10 wt.%, mix and stir for 180 min, stir evenly A coating slurry of poly-p-phenylene terephthalamide doped with carbon nanotubes, that is, a first coating slurry, can be obtained.

[0044] (2) Add 200g methyl ethyl ketone to 800g water, mix well, as a solvent for dissolving the polymer, then add 45g of BYK-156 dispersant to it, after stirring for 5min, add 600g of polyvinylidene fluoride, mix and stir for 120min; Add 12 g of polyvinyl alcohol, mix and stir for 60 minutes, and stir evenly to obtain polyvinylidene fluoride coating slurry.

[0045] (3) Coat the first coating slurry obtained in step (1) on the positive electrode side of a polyethylene support film with a thickness of 12 μm, and the coating method adopts a microgravure transfer method.

[0046] (4) Use a mixed solution of dimethylace...

Embodiment 3

[0051] (1) Add 60g of super-p conductive carbon black to 1000g of dimethylacetamide, stir at high speed for 30min; then add 350g of polyimide solution with a concentration of 15wt.%, mix and stir for 180min, and stir evenly to obtain the mixed The polyimide coating slurry mixed with super-p conductive carbon black is the first coating slurry.

[0052] (2) Add 25g of KC-300 dispersant to 1000g of deionized water, stir for 5min, add 400g of polyvinylidene fluoride, mix and stir for 120min; then add 9g of hydroxyethyl cellulose, mix and stir for 90min, stir evenly A polyvinylidene fluoride coating slurry is available.

[0053] (3) Coat the first coating slurry obtained in step (1) on the positive electrode side of a polyethylene support film with a thickness of 12 μm, and the coating method adopts a microgravure transfer method.

[0054] (4) Use a mixed solution of dimethylacetamide and water as the extractant to extract the coated diaphragm, wherein the water content is 60wt.%;...

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Abstract

The invention discloses a lithium-sulfur battery diaphragm, a preparation method thereof and a lithium-sulfur battery, and the lithium-sulfur battery diaphragm is prepared by the following method: 1,uniformly dispersing a conductive additive in an organic solvent, then adding an amino polymer, and uniformly dispersing to obtain a first coating slurry; 2, uniformly coating the first coating slurryon the positive electrode side of a support film to form a first coating; 3, extracting the diaphragm obtained in the step 2 by using a mixed solution of an organic solvent and water as an extractingagent, washing the diaphragm with deionized water, and drying the diaphragm at 30-70 DEG C; 4, preparing polyvinylidene fluoride coating slurry, and coating two sides of the battery diaphragm obtained in the step 3 with the polyvinylidene fluoride coating slurry; and 5, carrying out drying to obtain the lithium-sulfur battery diaphragm. The diaphragm can play a good role in intercepting a lithiumsulfur compound, a little gap can exist between the diaphragm and a pole piece, an elastic space can be provided for volume expansion of an electrode material in the long-acting cycle process of thebattery, and electrode expansion failure is avoided.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery diaphragm, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] In recent years, more and more new energy electric vehicles have been used in people's daily travel, and the state has also vigorously supported and promoted the market application of new energy electric vehicles, but the mileage worry is the primary concern of ordinary people, which greatly restricts The promotion and popularization of new energy vehicles. The theoretical energy density of lithium-sulfur batteries is as high as 2600Wh / kg, which is much higher than the current commercial lithium-ion batteries, and it fits the needs of electric vehicles very well. However, the reaction system of lithium-sulfur batteries is very complex. The polysulfides produced during charging and discharging will dissolve in the electrolyte, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 袁海朝徐锋孙翠娟苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD