CN-116368645-B - Positive electrode of lithium-sulfur battery using textile material, lithium-sulfur battery containing positive electrode and preparation method of positive electrode

CN116368645BCN 116368645 BCN116368645 BCN 116368645BCN-116368645-B

Abstract

The invention provides a method for preparing a positive electrode of a lithium-sulfur battery using a textile material, which is characterized by comprising a step of preparing a conductive support by carbonizing the textile material by heat treatment, a step of plating a conductive metal material on the conductive support, a step of loading a first carbon material containing the sulfur polymer and modified with a first functional group capable of hydrogen bonding with the sulfur polymer on the plated conductive support, and a step of loading a second carbon material modified with a second functional group capable of self-assembly with the first carbon material in a layer form on the conductive support to form a coating layer.

Inventors

ZHAO ZHENHAN
SHEN DONGYE
SONG RONGQUAN

Assignees

高丽大学校产学协力团

Dates

Publication Date: 20260505
Application Date: 20210804
Priority Date: 20201008

Claims (10)

1. A method of preparing a positive electrode for a lithium sulfur battery using a textile material, wherein the method comprises: A step of preparing a conductive support by carbonizing a fabric material by heat treatment at 600 ℃ to 900 ℃; electroplating a conductive metal material on the conductive support; loading a plated conductive support with a slurry comprising a sulfur polymer and a first carbon material modified with a first functional group capable of hydrogen bonding with the sulfur polymer, and And a step of loading a second carbon material on the conductive support, wherein the second carbon material is modified with a second functional group capable of hydrogen bonding with the first functional group, and the first carbon material and the second carbon material are layered and self-assembled to form a coating layer.
2. The method of preparing a positive electrode for a lithium sulfur battery using a fabric material according to claim 1, wherein the first carbon material and the second carbon material are carbon nanotubes, the first functional group is an amine group, and the second functional group is a carboxyl group.
3. The method for preparing a positive electrode for a lithium-sulfur battery using a fabric material according to claim 1, wherein the conductive support prepared by the heat treatment maintains the network structure of the fabric material as it is.
4. The method for preparing a positive electrode for a lithium-sulfur battery using a fabric material according to claim 1, wherein the conductive metal material comprises one or more selected from the group consisting of nickel, copper, and aluminum.
5. The method for preparing a positive electrode for a lithium-sulfur battery using a fabric material according to claim 1, wherein the fabric material is a fabric having carbon atoms in a main chain.
6. A lithium sulfur battery positive electrode comprising: a conductive support having a network structure of textile material; a conductive metal material coated on the conductive support; A sulfur polymer supported on the conductive metal material, and A cover layer formed by layered self-assembly of a first carbon material modified with a first functional group that binds to the sulfur polymer and a second carbon material modified with a second functional group that is capable of hydrogen bonding with the first functional group.
7. The lithium sulfur battery positive electrode according to claim 6, wherein the lithium sulfur battery positive electrode is prepared by the method of any one of claims 1 to 5.
8. The lithium sulfur battery positive electrode according to claim 6, wherein the first carbon material and the second carbon material are carbon nanotubes, the first functional group is an amine group, and the second functional group is a carboxyl group.
9. The lithium sulfur battery positive electrode according to claim 6, wherein the conductive metal material contains one or more selected from the group consisting of nickel, copper, and aluminum.
10. A lithium sulfur battery comprising the positive electrode of claim 6.

Description

Positive electrode of lithium-sulfur battery using textile material, lithium-sulfur battery containing positive electrode and preparation method of positive electrode Technical Field The present invention relates to a positive electrode for a lithium-sulfur battery using a textile material, a lithium-sulfur battery including the same, and a method for manufacturing the same, and more particularly, to a positive electrode for a lithium-sulfur battery using a textile material, which has a large sulfur loading amount and excellent electrical characteristics, a lithium-sulfur battery including the same, and a method for manufacturing the same. Background Electrodes, catalysts, adsorbents, sensors, and the like have a structure in which a conductive material such as a metal is contained as an active material on a support. In this case, excellent conductivity of the support, high specific surface areas of the support and the conductive active material, convenient processability, and the like are required. For this purpose, an electrode directly using a carbon support such as a carbon nanotube or graphene as a support and a method for producing the same are used. For example, korean laid-open patent No. 10-2009-0041637 discloses a polyimide carbon nanofiber electrode capable of reducing the diameter of carbon fibers, korean laid-open patent No. 10-2017-008059 discloses an electrode based on carbon fiber fabrics/metal oxide nanowires for energy storage devices, and a method for preparing the same. However, these direct use of the carbon support means require the preparation of a carbon-based support, for which additional preparation of a carbon-based material is required. As an alternative, studies using a fabric material as a support are actively being conducted. For example, in the case of being used as an electrode, the fabric material can not only increase the loading (loading) amount of the active material based on high porosity and internal surface area, but also become an effective structure for smooth particle movement. Accordingly, studies have been reported to prepare porous electrodes by imparting conductivity to insulating textile materials and to apply them as high-performance energy storage devices. Lithium sulfur batteries are actively studied as energy storage devices due to high theoretical energy density values or as new generation energy storage devices. However, lithium sulfur batteries have a disadvantage of low driving stability due to low conductivity of sulfur as a positive electrode material, volume expansion during driving, and loss of sulfur (shutdown effect) caused by irreversible reaction. In order to overcome the above-mentioned drawbacks, studies of electrically polarizing a mixture of a conductive material having a physical/chemical bonding force with sulfur and sulfur are actively being conducted, but studies conducted on a flat plate show that the loading amount of sulfur is limited. From this point, in order to overcome the limitation of conductivity and ionic conductivity caused by the increase in the active material loading of the current collector and to achieve high density energy capacity per unit volume/area and output characteristics, it is necessary to develop an electrode having excellent conductivity and high surface area. In preparing a porous current collector, a fabric material has insulating properties, although it is not only capable of increasing the loading amount of an active material based on high porosity and internal surface area, but also an effective structure for smooth ion movement. Accordingly, studies have been reported to prepare porous electrodes by imparting conductivity to insulating textile materials and to apply them as high-performance energy storage devices. However, many cases are difficult to prepare as an effective porous current collector for a high-performance energy storage device for the following reasons, and first, although the existing commercially available porous metal current collector has high conductivity, it is not only excessively heavy in terms of weight reduction of the material, but also has a limit in porosity and internal surface area. Further, since the mass production of electrodes is limited by the etching process using strong acid and the expensive cost, carbon-based porous electrodes in which conductive carbon materials such as Carbon Nanotubes (CNT) or graphene are coated on a fabric material have disadvantages that they are not only conductive but also have reduced electrochemical stability compared to metal materials. On the other hand, when the fabric material is coated by electroless plating (electroless deposition), it is difficult to uniformly coat not only the fibril structure inside the fabric material but also the surface area of the porous structure due to the blocking phenomenon. Further, since impurities are contained in the surface treatment and reduction process, the conductivity and mechanical stability