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Aramid-coated battery separator loaded with nanomaterials, preparation method and lithium-sulfur battery

A technology of nanomaterials and battery separators, applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of hindering the migration path of lithium ions, slow migration of lithium ions, and easy peeling of coatings, etc., to achieve excellent heat dissipation Stability and chemical stability, excellent adhesion, effect of improving utilization

Active Publication Date: 2022-07-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former may prolong or hinder the migration path of lithium ions due to the existence of a large number of binder components and the common copolymerization problem, resulting in slow migration of lithium ions; the latter has problems such as too thick coating and easy peeling off of the coating.

Method used

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  • Aramid-coated battery separator loaded with nanomaterials, preparation method and lithium-sulfur battery
  • Aramid-coated battery separator loaded with nanomaterials, preparation method and lithium-sulfur battery
  • Aramid-coated battery separator loaded with nanomaterials, preparation method and lithium-sulfur battery

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preparation example Construction

[0044] The preparation method of the nanomaterial-loaded aramid-coated battery separator of the present invention comprises the following steps:

[0045] (1) adding potassium hydroxide, deionized water, and aramid polymer into dimethyl sulfoxide, stirring and dissolving at room temperature, and adding absolute ethanol dropwise to obtain aramid nanofiber slurry;

[0046] (2) coating the aramid nanofiber slurry obtained in step (1) on the surface of the polyolefin porous membrane to obtain a coating film;

[0047] (3) infiltrating the coating film obtained in step (2) into the replacement solvent, the first precursor solution and the second precursor solution in sequence, respectively, and washing to obtain a coating film loaded with nanomaterials;

[0048] (4) drying the nanomaterial-loaded coating film obtained in step (3) in a vacuum oven to obtain a nanomaterial-loaded aramid-coated battery separator.

[0049] Wherein, in the aramid fiber nanofiber slurry of step (1), the m...

Embodiment 1

[0060] The nanomaterial-loaded aramid-coated battery separator of this embodiment includes a polyolefin porous separator, an aramid coating coated on one side of the base membrane, and ZnS nanomaterials supported by the aramid-coated aramid nanofibers. The aramid nanofiber slurry is coated on one side of the polyolefin porous separator, soaked in deionized water, zinc salt solution, and sulfide salt solution successively, washed and dried to prepare a composite separator for lithium-sulfur batteries. The component content of aramid nanofiber slurry is: potassium hydroxide: 0.09g; deionized water: 1.2g; aramid polymer: 0.06g; dimethyl sulfoxide: 33g; the mass of absolute ethanol: 4.5g , the dropping rate is 0.05ml / s; the polyolefin porous diaphragm is polyethylene microporous diaphragm; the thickness of the coating slurry is 30 μm; the zinc salt is zinc sulfate; the sulfide salt is sodium sulfide; the solvent is deionized water; the zinc salt solution The concentration of 1mol / ...

Embodiment 2

[0069] The nanomaterial-loaded aramid-coated battery separator of this embodiment includes a polyolefin porous separator, an aramid coating coated on one side of the base membrane, and ZnS nanomaterials supported by the aramid-coated aramid nanofibers. The aramid nanofiber slurry is coated on one side of the polyolefin porous separator, soaked in deionized water, zinc salt solution, and sulfide salt solution successively, washed and dried to prepare a composite separator for lithium-sulfur batteries. The component content of aramid nanofiber slurry is: potassium hydroxide: 0.18g; deionized water: 1.2g; aramid polymer: 0.12g; dimethyl sulfoxide: 33g; the mass of absolute ethanol: 8.1g , the dripping rate is 0.05ml / s; the polyolefin porous diaphragm is polyethylene microporous diaphragm; the thickness of the coating slurry is 120 μm; the zinc salt is zinc sulfate; the sulfide salt is sodium sulfide; the solvent is deionized water; zinc salt solution The concentration of 1mol / l; ...

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Abstract

The invention discloses a nano-material-loaded aramid-coated battery separator, which comprises a polyolefin porous separator and an aramid coating coated on one side of the separator, wherein the aramid nanofibers of the aramid coating are loaded with nanomaterials. The invention also discloses a preparation method of the separator and a lithium-sulfur battery with the separator. The aramid coating of the present invention has good thermal stability and electrolyte affinity, and the loaded nanomaterials can inhibit the shuttle of high-level lithium polysulfide chains and promote the mutual conversion of high-level lithium polysulfide chains; The adopted preparation method can ensure the uniform distribution of the nanomaterials and increase the specific surface area of ​​the nanomaterials. By assembling the separator in a lithium-sulfur battery, the specific capacity and cycle stability of the lithium-sulfur battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to an aramid fiber-coated battery separator loaded with nanometer materials, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] Traditional batteries have gradually withdrawn from our attention due to their low capacity, low efficiency and environmental pollution, and lithium-ion batteries, which are widely used in various electronic products, also have problems such as low capacity. Among various new batteries, the theoretical specific capacity of lithium-sulfur batteries is as high as 1675mAh g -1 , the theoretical energy density is 2600Wh kg -1 [Journal of MaterialsChemistry A, 2017, 5(7): 3014-3038], in addition, its cathode material, sulfur, is environmentally friendly, inexpensive and abundant. These advantages make it very promising in next-generation electrochemical energy storage devices. [0003] During the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/417H01M10/052H01M50/403H01M50/44H01M50/449H01M50/491
CPCH01M50/417H01M50/44H01M50/449H01M50/491H01M50/403H01M10/052Y02E60/10
Inventor 解孝林杨成荫周兴平叶昀昇王盼盼林荆娅
Owner HUAZHONG UNIV OF SCI & TECH
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