Nanometer material-loaded aramid fiber-coated battery diaphragm, preparation method thereof, 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: 2021-11-02
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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  • Nanometer material-loaded aramid fiber-coated battery diaphragm, preparation method thereof, and lithium-sulfur battery
  • Nanometer material-loaded aramid fiber-coated battery diaphragm, preparation method thereof, and lithium-sulfur battery
  • Nanometer material-loaded aramid fiber-coated battery diaphragm, preparation method thereof, and lithium-sulfur battery

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preparation example Construction

[0044] The preparation method of the aramid-coated battery diaphragm loaded with nanomaterials of the present invention comprises the following steps:

[0045] (1) Potassium hydroxide, deionized water, and aramid fiber polymer are added to dimethyl sulfoxide, stirred and dissolved at room temperature, and absolute ethanol is added drop by drop to prepare aramid fiber nanofiber slurry;

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

[0047] (3) soak the coating film obtained in step (2) into the replacement solvent, the first precursor solution and the second precursor solution respectively in order, and wash to obtain the 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 in step ...

Embodiment 1

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

Embodiment 2

[0069] The aramid-coated battery separator loaded with nanomaterials in this embodiment includes a polyolefin porous separator, an aramid coating coated on one side of the base film, and ZnS nanomaterials supported by aramid nanofibers coated with aramid. The aramid nanofiber slurry was coated on one side of the polyolefin porous diaphragm, soaked in deionized water, zinc salt solution, and sulfide salt solution successively, washed and dried to prepare a composite diaphragm for lithium-sulfur batteries. The component content of the aramid nanofiber slurry is: potassium hydroxide: 0.18g; deionized water: 1.2g; aramid polymer: 0.12g; dimethyl sulfoxide: 33g; the quality of absolute ethanol: 8.1g , the dropping rate is 0.05ml / s; the polyolefin porous diaphragm is a 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 concentratio...

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Abstract

The invention discloses a nanometer material-loaded aramid fiber coated battery diaphragm. The nanometer material-loaded aramid fiber coated battery diaphragm comprises a polyolefin porous diaphragm and an aramid fiber coating which coats one side of the polyolefin porous diaphragm, and the nanometer material is loaded on the aramid fiber nanofiber of the aramid fiber coating. The invention also discloses a preparation method of the diaphragm and a lithium-sulfur battery with the diaphragm. The coated aramid fiber coating has good thermal stability and electrolyte affinity, and the loaded nano material can inhibit shuttling of high-grade lithium polysulfide chains and promote mutual conversion of the high-grade lithium polysulfide chains; and the preparation method adopted in the invention can ensure uniform distribution of the nano-material and increase the specific surface area of the nano-material. When the diaphragm is assembled in the lithium-sulfur battery, the specific capacity and the cycling 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-coated battery separator loaded with nanomaterials, a preparation method thereof and a lithium-sulfur battery. Background technique [0002] Traditional batteries have gradually withdrawn from our sight due to problems such as 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 anode material sulfur element is environmentally friendly and cheap, and has abundant reserves. These advantages make them very promising in next-generation electrochemical energy storage devices. [0003] Duri...

Claims

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Application Information

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Patent Type & Authority Applications(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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