Acrylic fiber-based lithium-sulfur battery interlayer material and preparation method thereof

A technology for interlayer materials and sulfur batteries, which is applied to secondary batteries, battery pack components, circuits, etc., can solve the problems of difficult electrochemical reactions, poor LiPS capture and conversion efficiency, and poor performance, and achieves a simple preparation method. , The preparation process is simple and green

Active Publication Date: 2021-11-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to their intrinsic low conductivity, the immobilized LiPS remains on the surface, making it difficult to fully participate in the electrochemical reactions.
Therefore, complexation with carbon is necessary because polysulfides must diffuse to the conductive carbon surface to achieve conversion, which leads to slow blocking of reaction kinetics and low efficiency.
In addition, physical adsorption and chemical trapping perform poorly at high sulfur loadings because the limited number of adsorption sites makes the capture-diffusion conversion process gradually interrupted, and due to the insoluble and insulating lithium sulfide (Li 2 S) Accumulated on the carbon surface, the adsorption / trapping efficiency is greatly reduced
Some polar conductors can provide adsorption sites and high conductivity for redox reactions, but their adsorption capacity is much lower than that of ZnO, TiO 2 and other metal oxides, making the capture and conversion efficiency of LiPS poor

Method used

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  • Acrylic fiber-based lithium-sulfur battery interlayer material and preparation method thereof
  • Acrylic fiber-based lithium-sulfur battery interlayer material and preparation method thereof
  • Acrylic fiber-based lithium-sulfur battery interlayer material and preparation method thereof

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Effect test

Embodiment 1

[0038] A method for preparing a lithium-sulfur battery interlayer material based on acrylic yarn as a carbon source with excimer ultraviolet lamp irradiation modification of ZnO, the specific steps of the method are as follows:

[0039](1) Accurately weigh the acrylic fiber dissolved in N-N dimethylformamide (DMF) with an analytical balance, and the total concentration of solute is 10%. Stir at room temperature for 48 h, then raise the temperature to 85° C., and stir for 2 h to obtain a uniform and stable electrospinning solution.

[0040] (2) Electrospinning equipment was used to prepare nanofiber membranes, the spinning voltage was 10 kV, the receiving distance was 20 cm, and the air humidity was 50%. The evenly stirred spinning solution was electrospun.

[0041] (3) High-temperature carbonization: Pre-oxidize at 190°C for 90 minutes, and then carbonize at 800°C for 3 hours. Carbonization needs to be in an argon atmosphere to obtain a carbon nanofiber film with acrylic fiber...

Embodiment 2

[0045] A method for preparing a lithium-sulfur battery interlayer material based on acrylic yarn as a carbon source with excimer ultraviolet lamp irradiation modification of ZnO, the specific steps of the method are as follows:

[0046] (1) Accurately weigh the acrylic fiber dissolved in N-N dimethylformamide (DMF) with an analytical balance, and the total concentration of solute is 10%. Stir at room temperature for 48 h, then raise the temperature to 85° C., and stir for 2 h to obtain a uniform and stable electrospinning solution.

[0047] (2) The nanofiber membrane was prepared by electrospinning equipment, the spinning voltage was 10 kV, the receiving distance was 20 cm, and the air humidity was 50%.

[0048] (3) High-temperature carbonization: Pre-oxidize at 190°C for 90 minutes, and then carbonize at 800°C for 3 hours. Carbonization needs to be in an argon atmosphere to obtain a carbon nanofiber film with acrylic fiber as the carbon source.

[0049] (4) Put the carbon na...

Embodiment 3

[0052] A method for preparing a lithium-sulfur battery interlayer material based on acrylic yarn as a carbon source with excimer ultraviolet lamp irradiation modification of ZnO, the specific steps of the method are as follows:

[0053] (1) Accurately weigh the acrylic fiber dissolved in N-N dimethylformamide (DMF) with an analytical balance, and the total concentration of solute is 10%. Stir at room temperature for 48 h, then raise the temperature to 85° C., and stir for 2 h to obtain a uniform and stable electrospinning solution.

[0054] (2) The nanofiber membrane was prepared by electrospinning equipment, the spinning voltage was 10 kV, the receiving distance was 20 cm, and the air humidity was 50%.

[0055] (3) High-temperature carbonization: Pre-oxidize at 190°C for 90 minutes, and then carbonize at 800°C for 3 hours. Carbonization needs to be in an argon atmosphere to obtain a carbon nanofiber film with acrylic fiber as the carbon source.

[0056] (4) Put the carbon na...

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Abstract

The invention relates to an acrylic-based lithium-lithium-sulfur battery interlayer material modified with ZnO irradiated by an excimer ultraviolet lamp and a preparation method thereof, belonging to the technical field of energy storage system device materials. The preparation method of the acrylic fiber-based lithium-lithium-sulfur battery interlayer material with excimer ultraviolet lamp irradiation modification of ZnO comprises the following steps: acrylic fiber yarn is dissolved in DMF, fully stirred, electrospun, and high-temperature carbonization to obtain a carbon fiber film, and then pass The excimer ultraviolet lamp is irradiated in the aqueous solution of the zinc salt, and the carbon nanofiber film modified with ZnO is obtained after drying and annealing. The preparation material source of the present invention is environment-friendly, and the process is short, green, safe, efficient and clean. The prepared carbon nanofiber film modified with ZnO is used as the interlayer of lithium-sulfur batteries. The interlayer can not only physically block polysulfides but also fix polysulfides through efficient and powerful chemical adsorption, so that active materials can be efficiently utilized, thereby improving Electrochemical performance of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to an energy storage system device material, in particular to an acrylic fiber-based lithium-sulfur battery interlayer material (ZnO-CNF) and a preparation method thereof, belonging to the technical field of energy storage system device materials. Background technique [0002] With the increasing demand and requirements for new energy and portable electronic devices, it is necessary to develop a more stable and high-quality rechargeable energy storage system. Among them, lithium-sulfur (Li-S) batteries have higher energy density (2600 W h kg -1 ) and the cost is lower than the current lithium-ion battery to become the next generation energy storage device. However, its practical application is limited by the low sulfur utilization due to the poor cycle life due to the low electronic conductivity of sulfur and the severe shuttling effect of soluble lithium polysulfides (LiPSs) formed in the electrochemical reaction. Previous stud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/446H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/44Y02E60/10
Inventor 胡毅蒋丽源沈桢吴克识
Owner ZHEJIANG SCI-TECH UNIV
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