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Composite diaphragm, preparation method and application of composite diaphragm in lithium-sulfur battery

A composite diaphragm, lithium-sulfur battery technology, applied in secondary batteries, battery pack parts, secondary battery repair/maintenance, etc., can solve the problem of not being able to simultaneously inhibit dendrite growth and polysulfide shuttle, and improve Coulomb efficiency. Effect

Inactive Publication Date: 2020-03-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the ubiquitous problem of lithium-sulfur batteries—the inability to simultaneously inhibit the growth of dendrites and prevent the shuttling of polysulfides, the present invention aims to provide a composite separator for

Method used

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  • Composite diaphragm, preparation method and application of composite diaphragm in lithium-sulfur battery
  • Composite diaphragm, preparation method and application of composite diaphragm in lithium-sulfur battery
  • Composite diaphragm, preparation method and application of composite diaphragm in lithium-sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041]Clean commercial carbon paper was used as a liquid-absorbing layer (5 μm), and then a layer of polyethylene polymer (in polyethylene-dispersed MNP solvent) was coated on the surface of the carbon paper as an insulating lithium-conducting layer (15 μm). After drying, a layer of zinc sulfide (particle size of 2 μm, shown in figure 1 and figure 2 ) and polyethylene mixture (in the MNP solvent in which zinc sulfide and polyethylene are dispersed in a mass ratio of 70%) as a lithium-philic layer (5 μm). Subsequently, using the composite diaphragm as a diaphragm ( image 3 ), with lithium metal as the negative electrode, carbon nanotube positive electrode rich in S, and 1M LiTFSI / DOL:DME (volume ratio=1:1) containing 1wt.% LiNO 3 The lithium-sulfur battery is composed of the electrolyte, and the charge-discharge cycle test is performed at a rate of 1C.

[0042] The relevant results of the tests are shown in Table 1.

Embodiment 2

[0057] A clean commercial carbon cloth was used as the liquid-absorbing layer (40 μm), and then a layer of polypropylene polymer (polypropylene dispersed in MNP solvent) was coated on the surface of the carbon cloth as an insulating lithium-conducting layer (25 μm). After drying, a layer of silver particles (particle size: 0.5 μm) and polypropylene mixture (silver particles and polypropylene dispersed in MNP solvent with a mass ratio of 70%) was coated on the surface of the insulating lithium-conducting layer as a lithium-philic layer (12 μm). Subsequently, the composite diaphragm was used as a diaphragm, metal lithium was used as a negative electrode, and a carbon nanotube positive electrode rich in S was used to contain 1wt.% LiNO with 1M LiTFSI / DOL:DME (volume ratio=1:1). 3 The lithium-sulfur battery is composed of the electrolyte, and the charge-discharge cycle test is performed at a rate of 1C.

[0058] The relevant results of the tests are shown in Table 2.

Embodiment 3

[0060] A clean commercial carbon cloth was used as the liquid-absorbing layer (40 μm), and then a layer of polypropylene polymer (polypropylene dispersed in MNP solvent) was coated on the surface of the carbon cloth as an insulating lithium-conducting layer (25 μm). After drying, a layer of silver oxide particles (particle size is 0.5 μm) and polypropylene mixture (silver oxide particles and polypropylene are dispersed in the MNP solvent with a mass ratio of 70%) are coated on the surface of the insulating lithium-conducting layer as a lithium-philic layer (12 μm ). Subsequently, the composite diaphragm was used as a diaphragm, metal lithium was used as a negative electrode, and a carbon nanotube positive electrode rich in S was used to contain 1wt.% LiNO with 1M LiTFSI / DOL:DME (volume ratio=1:1). 3 The lithium-sulfur battery is composed of the electrolyte, and the charge-discharge cycle test is performed at a rate of 1C.

[0061] The relevant results of the tests are shown i...

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Abstract

The invention discloses the preparation and application of a composite diaphragm for a lithium-sulfur battery. The composite diaphragm is composed of a lithium-philic layer (right opposite to a lithium negative electrode), an insulating lithium-conducting layer and a liquid-absorbing layer (right opposite to a sulfur positive electrode), and has the advantages that the lithium-philic layer can react with the tip of the lithium dendrites, so that the lithium dendrites are consumed, and the lithium dendrites are prevented from continuously growing to puncture the diaphragm; the insulating lithiumconducting layer is used for conducting lithium ions but effectively blocking electrons; and the liquid absorption layer is used for adsorbing and storing electrolyte and preventing the transmissionof polysulfide dissolved in the positive electrode between the positive electrode and the negative electrode. Benefited from the unique structural advantages, the lithium-sulfur battery composed of the composite diaphragm has long cycle life and excellent cycle performance.

Description

technical field [0001] The invention belongs to the field of energy storage, and in particular relates to the preparation and application of a composite separator for lithium-sulfur batteries. Background technique [0002] Lithium-sulfur battery is a type of lithium metal battery that uses metallic lithium as the negative electrode and elemental sulfur or compound sulfur as the positive electrode. Thanks to the ultra-high theoretical specific capacity (3860mAh / g) of metal lithium, the lowest electrode potential (-3.045V) and the extremely high theoretical specific capacity (1675mAh / g) of sulfur cathode, the lithium-sulfur battery has an ultra-high capacity of 2600Wh / kg. The energy density is more than ten times that of the current commercial lithium-ion batteries. At the same time, lithium-sulfur batteries are known as the most promising next-generation energy storage devices due to the cost advantage of sulfur cathodes. Therefore, lithium-sulfur batteries have received ex...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235H01M50/411H01M50/431Y02E60/10
Inventor 赖延清洪波范海林董庆元张治安张凯
Owner CENT SOUTH UNIV
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