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Multifunctional diaphragm of lithium-sulfur battery and preparation method of multifunctional diaphragm

A lithium-sulfur battery, multi-functional technology, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problem of limited modification ability of separators, poor performance of lithium-sulfur batteries, and uniform dispersion of polydopamine and carbon materials And other issues

Inactive Publication Date: 2021-05-07
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the modified diaphragm of lithium-sulfur batteries is prepared by simple mixing of polydopamine and carbon materials to form a slurry, and then coated on the base diaphragm to form a modified diaphragm. However, it is difficult to disperse polydopamine and carbon materials evenly by simple mixing , the ability to modify the separator is limited. If the undispersed carbon particles do not have the ability to block polysulfides, it will even make the performance of lithium-sulfur batteries worse.

Method used

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  • Multifunctional diaphragm of lithium-sulfur battery and preparation method of multifunctional diaphragm
  • Multifunctional diaphragm of lithium-sulfur battery and preparation method of multifunctional diaphragm
  • Multifunctional diaphragm of lithium-sulfur battery and preparation method of multifunctional diaphragm

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Embodiment 1

[0048] A lithium-sulfur battery multifunctional diaphragm of the present invention, comprising a diaphragm substrate polyethylene porous membrane, the two surfaces of the diaphragm substrate are coated with a modified coating, and the modified coating is polydopamine, nitrogen-doped graphene and titanium carbide Composite coating, the content ratio of polydopamine, nitrogen-doped graphene and titanium carbide in the modified coating is about 1:0.15:0.15, and the thickness of the coating is 2 μm.

[0049] The preparation method of the multifunctional membrane of the present embodiment comprises the following steps:

[0050] (1) Mix ammonia water, nitrogen-doped graphene, sodium diisooctyl sulfonate, isopropanol, and deionized water in a mass ratio of 1:0.01:16.25:20:230 to obtain solution A;

[0051] Mix dopamine hydrochloride and deionized water evenly at a mass ratio of 1:20 to obtain solution B;

[0052] (2) Under stirring conditions, according to the mass ratio of solution...

Embodiment 2

[0058] A lithium-sulfur battery multifunctional diaphragm of the present invention, comprising a diaphragm substrate polyimide porous membrane, the two surfaces of the diaphragm substrate are coated with a modified coating, the modified coating is carbon nanotubes containing polydopamine and oxygen doped and molybdenum sulfide composite coating, the content ratio of polydopamine, oxygen-doped carbon nanotubes and molybdenum sulfide in the modified coating is about 1:0.20:0.20, and the thickness of the coating is 20 μm.

[0059] The preparation method of the multifunctional membrane of the present embodiment comprises the following steps:

[0060] (1) Mix ammonia water, oxygen-doped carbon nanotubes, Ketjen black, sodium dioctyl sulfonate, methanol, and deionized water at a mass ratio of 1:10:23:0.325:95:150 Evenly, solution A is obtained;

[0061] Mix dopamine hydrochloride and deionized water uniformly at a mass ratio of 1:1 to obtain solution B;

[0062] (2) According to t...

Embodiment 3

[0068] A lithium-sulfur battery multifunctional diaphragm of the present invention, comprising a diaphragm substrate polyvinylidene fluoride porous membrane, the two surfaces of the diaphragm substrate are coated with a modified coating, the modified coating contains polydopamine, fullerene and di For the composite coating of vanadium, the mass ratio of polydopamine, fullerene and vanadium pentoxide in the modified coating is about 1:0.01:0.20, and the thickness of the coating is 10 μm.

[0069] The preparation method of the multifunctional membrane of the present embodiment comprises the following steps:

[0070] (1) Mix ammonia water, fullerene, polyoxyethylene polyoxypropylene pentaerythritol ether, ethanol, isopropanol, and deionized water in a mass ratio of 1:65:13.5:30:20:45 to obtain a solution A;

[0071] Mix dopamine hydrochloride and deionized water uniformly at a mass ratio of 1:50 to obtain solution B;

[0072] (2) Under stirring conditions, slowly add solution B...

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Abstract

The invention discloses a multifunctional diaphragm of a lithium-sulfur battery, which comprises a diaphragm substrate, wherein at least one surface of the diaphragm substrate is coated with a modified coating, the modified coating is a composite coating containing polydopamine, a carbon material and a catalytic material, and a catalyst is one or more of metal sulfide, metal carbide and metal oxide. The preparation method comprises the steps of firstly preparing a polydopamine / carbon dispersion liquid, then uniformly mixing the polydopamine / carbon dispersion liquid with the catalytic material, the thickening agent and other assistants to prepare slurry, finally coating the surface of the diaphragm matrix with the slurry, and drying to obtain the multifunctional diaphragm of the lithium-sulfur battery. The lithium-sulfur battery diaphragm prepared by the invention has shuttling inhibition and catalytic conversion functions on polysulfide, oxygen-containing functional groups in a polydopamine molecular chain inhibit shuttling of the polysulfide, the polysulfide is adsorbed on the coating side of the diaphragm under the action of the catalytic material and the carbon material, and polysulfide is prevented from shuttling to the negative electrode through the inhibition-conversion effect, so that the cycle life of the lithium-sulfur battery is remarkably prolonged.

Description

technical field [0001] The invention belongs to the field of new energy materials and devices, and in particular relates to a multifunctional separator for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] The electrochemical energy storage system is a key system to realize the conversion, storage and control of renewable clean energy, which is characterized by safety, low cost, high efficiency and long life, and realizes the conversion between chemical energy and electrical energy. Compared with traditional lead-acid batteries, nickel-metal hydride batteries and nickel-chromium batteries, the current commercial lithium-ion batteries have the advantages of light weight, low self-discharge, and no memory effect. With the development of the commercialization process, the application field of lithium-ion batteries has also expanded from portable electronic products such as mobile phones and notebook computers to electric vehicles, power to...

Claims

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Application Information

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IPC IPC(8): H01M50/443H01M50/446H01M50/449H01M50/489H01M50/491H01M50/403H01M10/052
CPCH01M10/052Y02E60/10
Inventor 黎天保吴秀峰曹景超李中良陈功哲焦灿王力刘依卓子涂飞跃
Owner CHANGSHA RES INST OF MINING & METALLURGY
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