Functional diaphragm based on mesoporous alumina with high specific surface area as well as preparation method and application of functional diaphragm

A technology of mesoporous alumina and high specific surface area, which can be used in non-aqueous electrolyte batteries, structural parts, electrical components, etc., can solve the problem of being unable to suppress the lithium polysulfide shuttle effect, achieve the suppression of polysulfide shuttle effect, and low price , easy and convenient preparation

Pending Publication Date: 2022-05-24
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the current commercial separators cannot suppress the lithium polysulfide shuttle effect, and to develop functional separators to obtain high-performance lithium-sulfur batteries, the present invention provides a functional separator based on high specific surface area mesoporous alumina and its preparation Methods and Applications

Method used

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  • Functional diaphragm based on mesoporous alumina with high specific surface area as well as preparation method and application of functional diaphragm
  • Functional diaphragm based on mesoporous alumina with high specific surface area as well as preparation method and application of functional diaphragm
  • Functional diaphragm based on mesoporous alumina with high specific surface area as well as preparation method and application of functional diaphragm

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Embodiment 1

[0035] S / CNT (S: CNT = 8: 2) composite materials, conductive agents Super-p and PVDF were mixed with a mass ratio of 7:2:1, and then a certain volume of NMP was added as a solvent to prepare a bindable slurry, which was coated on the aluminum foil after wiping with alcohol, and the surface load of S was controlled at 1.0mg / cm 2 Around. The aluminum foil coated with the paste is removed after vacuum drying in a 60 °C oven for 12 h, and it is cut into a 14 mm diameter disc with a tablet press as a positive plate for the button battery.

[0036]Assembly of the button battery: Battery case type: CR2032, PP separator model: Celgard2400, negative electrode: lithium sheet (purity ≥99.5%), electrolyte composition: 1M LiTFSI, DOL / DME (1:1, v / v), 1% LiNO 3 (wt%), electrolyte dosage: 30 to 40 μL, glove box: Ar gas (O 2 ＜0.01ppm，H 2 O＜0.01ppm)。

Embodiment 2

[0038] Synthesis of 1.MA: 5.1 g stearic acid dissolved in n-propanol. Add 3.1 ml of water and stir for about 30 min. Add 13.7 g of sec-butanol aluminum, stir for another 20 min, and then heat at 100 °C for 50 hours, the resulting product is filtered, washed with 99% absolute ethanol, and dried at 50 °C for 12 hours. The resulting powder is calcined for 4 hours in a nitrogen atmosphere at 410 °C, and then calcined in an air atmosphere of 420 °C for 4 hours. The resulting final product is a mesoporous alumina (MA) having a high specific surface area of the present invention.

[0039] 2. Sonically dissolve MA and G plus absolute ethanol, and then use PP diaphragm as the base for pumping filtration, and the diaphragm load is 0.24mg / cm 2 Finally, dry under vacuum for 12 h. The specific steps are as follows: weigh 3 mg MA, 7 mg graphene, add 50 ml of absolute ethanol, sonicate for 1 h, pump filtration with PP diaphragm as the base, and finally, dry under vacuum for 12 h, cut into discs ...

Embodiment 3

[0046] Synthesis of 1.MA: 5.1 g stearic acid dissolved in n-propanol. Add 3.1 ml of water and stir for about 30 min. Add 13.7 g of sec-butanol aluminum, stir for another 20 min, and then heat at 100 °C for 50 hours, the resulting product is filtered, washed with 99% absolute ethanol, and dried at 50 °C for 12 hours. The resulting powder is calcined for 4 hours in a nitrogen atmosphere at 410 °C, and then calcined in an air atmosphere of 420 °C for 4 hours. The resulting final product is a mesoporous alumina (MA) having a high specific surface area of the present invention.

[0047] 2. Sonically dissolve MA and G plus absolute ethanol, and then, with pp diaphragm as the substrate for pumping filtration, the diaphragm load is 0.24mg / cm 2 Finally, dry under vacuum for 12 h. The specific steps are as follows: weigh 2 mg MA, 8 mg graphene, add 50 ml of absolute ethanol, sonicate for 1 h, pump filtration with PP diaphragm as the base, and finally, dry under vacuum for 12 h, cut into dis...

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Abstract

The invention belongs to the technical field of preparation of lithium-sulfur batteries, and discloses a diaphragm based on mesoporous alumina (MA) with a high specific surface area as well as a preparation method and application of the diaphragm. The diaphragm is obtained by loading a mixture (MA (at) G) of mesoporous alumina (MA) and graphene (G) with high specific surface area on a commercial PP diaphragm. The diaphragm disclosed by the invention can effectively inhibit the shuttle effect of polysulfide, so that the electrochemical performance of the lithium-sulfur battery is greatly improved. The preparation method disclosed by the invention is simple and convenient, can realize large-scale production, and has a certain promotion effect on commercialization of a lithium-sulfur battery system.

Description

Technical field [0001] The present invention belongs to the field of lithium-sulfur battery preparation technology, more particularly, relates to a functional diaphragm with a high specific surface area mesoporous alumina and preparation methods and applications thereof. Background [0002] The high energy density, low cost, and environmental friendliness of lithium-sulfur batteries make them one of the ideal candidates for the next generation of energy storage equipment. At present, the biggest obstacle to the commercialization of lithium-sulfur batteries is the shuttle effect of soluble lithium polysulfide, which will lead to a series of problems such as poor battery cycle performance and lithium anode corrosion. In view of the shuttle effect of lithium polysulfide, researchers mainly look for solutions from the aspects of cathode materials, diaphragms, electrolytes, binders and so on. [0003] In recent years, the shuttle effect of inhibiting lithium polysulfide based on diaph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/417H01M50/431H01M50/403H01M50/491H01M10/052
CPCH01M50/449H01M50/417H01M50/431H01M50/403H01M50/491H01M10/052Y02E60/10
Inventor 陈超林铮林展张振宇徐娟
Owner GUANGDONG UNIV OF TECH
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