KR20160031293A - Cathode for lithium-sulfur battery and method for preparing the same - Google Patents

Abstract

The present invention relates to a positive electrode for a lithium-sulfur battery, and to a manufacturing method thereof. The positive electrode for a lithium-sulfur battery according to the present invention comprises a porous structure having conductivity; and a positive electrode active material carried in at least one part of the surface and inside of the porous structure. The subject of the present invention is to provide a lithium-sulfur battery controlling corruption of the structure of the positive electrode even sulfur which is an active material of the lithium-sulfur battery is converted into polysulfide, and accordingly increasing durability of the positive electrode.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a positive electrode for a lithium-sulfur battery,

The present invention relates to a positive electrode for a lithium-sulfur battery and a method of manufacturing the same.

The lithium-sulfur battery uses a sulfur-based compound having a sulfur-sulfur bond as a cathode active material and a carbon-based material in which an alkali metal such as lithium or a metal ion such as lithium ion is intercalated or deintercalated is used as a negative active material Battery. The reduction of the sulfur-sulfur bond during the reduction reaction leads to a decrease in the oxidation number of sulfur and an oxidation-reduction reaction in which the sulfur-sulfur bond is regenerated while the oxidation number of the sulfuric acid is increased .

The lithium-sulfur battery has an energy density of 3,830 mAh / g when lithium metal is used as a negative electrode active material and 1,675 mAh / g of sulfur (S ₈ ) as a positive electrode active material. Battery. In addition, the sulfur compound used as the cathode active material is advantageous in that it is a cheap and environmentally friendly substance.

However, sulfur has an electrical conductivity of 5 × 10 ^-30 S / cm, which is close to that of insulators. Therefore, it is difficult to transfer electrons generated by an electrochemical reaction. Therefore, it has been necessary to use an electrically conductive material such as carbon that can provide a smooth electrochemical reaction site. In this case, when the conductive material and sulfur are used in a simple mixture, the sulfur is leaked out to the electrolyte in the oxidation-reduction reaction and the battery life is deteriorated. Also, when the appropriate electrolyte is not selected, lithium polysulfide There is a problem that they are no longer able to participate in the electrochemical reaction.

Thus, there was a need to improve the mixing quality of carbon and sulfur to reduce the flux of sulfur into the electrolyte and to increase the electronic conductivity of the electrode containing sulfur.

Korean Patent Publication No. 10-2007-0083384

A problem to be solved by the present application is to provide a lithium-sulfur battery capable of suppressing the structure collapse of the anode even when sulfur, which is an active material of the lithium-sulfur battery, is converted into polysulfide, will be.

The problems to be solved by the present application are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be clearly understood by those skilled in the art from the following description.

One embodiment of the present application,

A conductive porous structure, and

A cathode active material supported on at least a part of the surface and the inside of the porous structure;

And a positive electrode for a lithium-sulfur battery.

In another embodiment of the present application,

1) preparing a porous structural body having conductivity, and

2) supporting a slurry containing a cathode active material or a cathode active material on at least a part of the surface and the interior of the porous structure

And a method for producing a positive electrode for a lithium-sulfur battery.

Further, another embodiment of the present application provides a lithium-sulfur battery including the positive electrode for a lithium-sulfur battery.

By supporting the positive electrode active material on at least a part of the surface and inside of the porous structure having conductivity, the positive electrode for a lithium-sulfur battery according to the present application can suppress the structure collapse of the positive electrode even when the active sulfur is converted into polysulfide, The durability of the anode can be increased.

Further, by using the conductive porous structure, the electron transfer area can be wider than that of the conventional aluminum foil, and the wetting area of the electrolyte can be increased, so that a lithium-sulfur battery having a high capacity can be formed have.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the form of a porous structural body having conductivity according to one embodiment of the present application. Fig.
2 is a schematic view showing the shape of a cathode for a lithium-sulfur battery according to an embodiment of the present application.

Brief Description of the Drawings The advantages and features of the present application, and how to accomplish them, will be apparent with reference to the embodiments described below in conjunction with the accompanying drawings. It should be understood, however, that the present application is not limited to the illustrated embodiments but is to be accorded the widest scope consistent with the principles of the invention, To fully disclose the scope of the invention to those skilled in the art, and this application is only defined by the scope of the claims. The dimensions and relative sizes of the components shown in the figures may be exaggerated for clarity of description.

Unless defined otherwise, all terms, including technical and scientific terms used herein, may be used in a manner that is commonly understood by one of ordinary skill in the art to which this application belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Hereinafter, the present application will be described in detail.

A unit cell of a conventional lithium-sulfur battery is generally laminated in the order of a copper foil as a collector of a negative electrode, a lithium electrode as a negative electrode, a separator, a sulfur electrode as an anode, and an aluminum foil as a collector of the positive electrode. In particular, the sulfur electrode, which is an anode, was produced by applying a slurry containing sulfur to an aluminum foil.

When conventional lithium-sulfur batteries are applied to an electric vehicle, the energy density of the battery should satisfy 300 to 500 Wh / kg in order to have a distance similar to that of a gasoline vehicle. In order to satisfy the above energy density, a method of thickening the sulfur active material on the aluminum current collector and laminating as much sulfur as possible per unit area is being approached. However, such a method does not cause any problem in initial conductivity of the positive electrode. However, as charging / discharging is repeated, some active materials are separated from the anode surface far away from the current collector, or the conductive path is reduced.

Thus, in the present application, by applying a porous structure having conductivity in place of a conventional aluminum foil, which is a current collecting body of a positive electrode, it is possible to suppress the structure collapse in the anode during charging / discharging of the lithium-sulfur battery, To increase the area.

The positive electrode for a lithium-sulfur battery according to one embodiment of the present application includes a porous structure having conductivity, and a positive electrode active material supported on at least a part of the surface and the interior of the porous structure.

In the present application, the porous structure may include at least one selected from the group consisting of conductive carbon and metal.

More specifically, the porous structure may include, but is not limited to, carbon paper. In addition, the porous structure may include a structure in the form of a conductive carbon foam.

In addition, the porous structure may include a structure in the form of an aluminum foam.

The porous structure is formed by crosslinking or intertwining conductive carbon, metal, or the like to form a three-dimensional net structure. An example of such a structure is shown in FIG. The porous structure may serve as a current collector in the anode.

The porous structure is formed by a plurality of conductive carbon, metal, or the like cross-linked or intertwined with each other to form a net structure. The cross-sectional diameter of each conductive carbon and metal may be 1 to 100 nm, but is not limited thereto. In addition, the distance between the conductive carbon and the metal may be several nm to several hundred nm, specifically, 1 to 1,000 nm. Accordingly, electron tunneling and electronic pass can be performed on the surface and inside of the porous structure, and numerous pores and high specific surface area of the porous structure itself can be used as a contact site of sulfur upon charge and discharge. Also, even if sulfur is swelled by the electrolytic solution, there is no separation of carbon and sulfur, so that the sulfur can be prevented from flowing out to the electrolyte, and the performance of the battery can be improved.

In addition, the porous structure enhances the electron conductivity because the conductive carbon, metal, or the like serves as an electron transfer path, and has an advantage that the capacity of the electrode can be improved. At the same time, conductive carbon, metal, or the like can act as a contact site of sulfur, so that even when sulfur is swelled by the electrolytic solution, separation of carbon and sulfur does not occur so that sulfur can be prevented from flowing out to the electrolyte, It is possible to improve the performance of the system.

The porosity of the porous structure is more than 172% of the volume ratio per unit weight of the cathode active material to be added. When the sulfur is completely reacted with lithium sulfide as the cathode active material, the total volume of the reaction becomes 172% of the initial sulfur volume, so that the volume of the reaction should be within the porous structure, and the structure breakdown of the porous structure, Can be prevented. The porosity of the porous structure may range from 10 to 90%, and preferably from 40 to 80%, the electron transfer area to sulfur may be increased while increasing the amount of sulfur loaded as the cathode active material. When the porosity is less than 10%, the porous structure is intertwined with each other to make it difficult to support the sulfur. When the porosity exceeds 90%, the specific surface area of the porous structure decreases, Can be.

The porous structure includes a conductive skeleton and voids, and the skeleton may have a three-dimensional structure. The diameter or thickness of the skeleton may vary depending on the amount of sulfur loaded as the cathode active material, and therefore is not particularly limited in the present application. That is, the present sulfur loading amount in the battery is about 3 mAh / cm ² , but in the case of increasing the sulfur loading amount, the thickness of the porous structure may also be changed in order to exhibit the highest capacity. According to one embodiment of the present application, the diameter or thickness of the porous structure may be 100 탆 or less, and the spacing between the scaffolds constituting the porous structure may be 500 탆 or less, but the present invention is not limited thereto.

The porous structure may result in a volume increase of 172% upon complete conversion of sulfur to lithium sulfide. That is, it is preferable that the porous structure has a porosity of 172% or more of the volume ratio per unit weight of the cathode active material to be added. Based on this, it is possible to have a porosity of 10 to 90% based on the total volume of the porous structure, and more specifically, a porosity of 40 to 80%.

In the present application, the cathode active material may be a material known in the art. More specifically, the cathode active material may include at least one selected from the group consisting of sulfur and sulfur-carbon composites, but is not limited thereto.

In particular, the cathode active material may be a carbon nanotube aggregate having a diameter of 50 탆 or less; And a sulfur-containing carbon nanotube-sulfur complex provided on at least a part of the inner and outer surfaces of the carbon nanotube aggregate.

Since the cathode active material may be influenced by the particle size of sulfur, it is preferable to adjust the particle size of the sulfur to a diameter (d50) of 5 μm or less. Since the sulfur itself is close to the non-conductive material, It is preferable to prepare a cathode active material by a method such as wrapping, coating, impregnation or the like with a material that can be imparted.

The cathode active material may be located inside the porous structure and may be located at least a part of the outer surface. When the cathode active material is located on the entire outer surface of the porous structure, the electron transporting role of conductive carbon, metal, and the like can be reduced. When the cathode active material is located on a part of the outer surface of the porous structure, the conductive carbon, metal, or the like exposed to the surface can perform the electron transferring role while contacting with the conductive material existing in the anode, It is preferable to increase the transmission contact area.

As the cathode active material, the sulfur may be a sulfur compound having a sulfur element (S8) or an S-S bond.

In order to support the positive electrode active material on the porous structure, sulfur, which is a positive electrode active material, and super-p, which is a carbon capable of providing conductivity to the sulfur, are mixed and the carbon is enclosed in the sulfur surface through a ball mill. A cathode active material can be produced. After the slurry is prepared by mixing the conductive material and the binder with the thus-prepared cathode active material, the slurry may be carried on the porous structure by dipping or casting the porous structure.

The content of sulfur in the slurry is about 60% by weight, the content of carbon is about 25% by weight (the content of the conductive material is about 15% by weight), and the polyethylene oxide as a binder can be adjusted to about 15% But is not limited thereto.

In the present application, the positive electrode for a lithium-sulfur battery may further include at least one selected from the group consisting of a conductive material and a binder resin.

As the conductive material, a conductive material known in the art can be used. The conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, but may be a graphite based material such as KS6; Carbon black such as Super P, Super Black, Denka Black, Acetylene Black, Ketjen Black, Channel Black, Ferneic Black, Lamp Black, Summer Black and Carbon Black; Carbon derivatives such as fullerene; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Or conductive polymers such as polyaniline, polythiophene, polyacetylene, and polypyrrole may be used alone or in combination.

The total content of the conductive material may be 0.01 to 40% by weight based on the total weight of the cathode for a lithium-sulfur battery, but is not limited thereto.

The binder resin may improve the adhesion between the positive electrode active material and the porous structure.

Examples of the binder resin include polyvinyl acetate, polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, alkylated polyethylene oxide, crosslinked polyethylene oxide, polyvinyl ether, poly (methyl methacrylate) (Trade name: Kynar), poly (ethyl acrylate), polytetrafluoroethylene polyvinyl chloride, polyacrylonitrile, polyvinylpyridine, polystyrene, polyvinylidene fluoride, polyvinylidene fluoride, , Carboxymethyl cellulose, derivatives thereof, blends thereof, copolymers thereof, and the like, but the present invention is not limited thereto.

The content of the binder resin may be 0.5-30 wt% based on the total weight of the positive electrode for a lithium-sulfur battery, but is not limited thereto. When the content of the binder resin is less than 0.5% by weight, the physical properties of the positive electrode are lowered and the active material and the conductive material in the positive electrode may fall off. When the amount exceeds 30% by weight, the ratio of the active material and the conductive material And the battery capacity can be reduced.

In the present application, the positive electrode for a lithium-sulfur battery may further include at least one additive selected from a transition metal element, a group IIIA element, a group IVA element, a sulfur compound of these elements, and an alloy of these elements and sulfur .

The transition metal element may be at least one element selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Os, Hg and the like, and the Group IIIA element includes Al, Ga, In, and Ti, and the Group IVA element may include Ge, Sn, Pb, and the like.

FIG. 2 is a schematic view of a cathode of a lithium-sulfur battery according to one embodiment of the present application. FIG.

Further, a method of manufacturing a positive electrode for a lithium-sulfur battery according to another embodiment of the present application comprises the steps of: 1) preparing a porous structural body having conductivity; and 2) preparing a porous structural body having a porous On at least a part of the surface and the interior of the structure.

In the method for manufacturing a positive electrode for a lithium-sulfur battery according to the present application, the contents of the porous structure, the cathode active material, and the like are the same as those described above, so a detailed description thereof will be omitted.

In the present application, the slurry may further include at least one of a conductive material, a binder resin, and an organic solvent. The contents of the conductive material and the binder resin are the same as described above, and the organic solvent may be a material known in the art. More specifically, the organic solvent is not particularly limited as long as it is an organic solvent capable of uniformly dispersing the cathode active material and the conductive material, and being easily evaporated. Specific examples of the solvent include ethanol, toluene, benzene, N-methylpyrrolidone (NMP), dimethylsulfoxide (DMSO), acetone, chloroform, dimethylformamide, cyclohexane, tetrahydrofuran, Methylene chloride, and mixtures thereof.

Further, another embodiment of the present application provides a lithium-sulfur battery including the positive electrode for a lithium-sulfur battery.

The lithium-sulfur battery includes the positive electrode for the lithium-sulfur battery; A negative electrode comprising lithium metal or a lithium alloy as a negative electrode active material; A separation membrane positioned between the anode and the cathode; And an electrolyte impregnated with the negative electrode, the positive electrode and the separator, and including a lithium salt and an organic solvent.

The negative electrode may be a material capable of reversibly intercalating or deintercalating lithium ions as a negative electrode active material, a material capable of reversibly reacting with lithium ions to form a lithium-containing compound, a lithium metal or a lithium alloy .

The material capable of reversibly intercalating or deintercalating lithium ions may be, for example, crystalline carbon, amorphous carbon, or a mixture thereof.

The material capable of reacting with the lithium ion to form a lithium-containing compound reversibly may be, for example, tin oxide, titanium nitrate, or silicon.

The lithium alloy may be, for example, an alloy of lithium and a metal selected from the group consisting of Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Ba, Ra, Al and Sn.

The separation membrane located between the anode and the cathode may be made of a porous nonconductive or insulating material which separates or insulates the anode and the cathode from each other and enables transport of lithium ions between the anode and the cathode. Such a separation membrane may be an independent member such as a film, or may be a coating layer added to the anode and / or the cathode.

The material forming the separation membrane includes, for example, a polyolefin such as polyethylene and polypropylene, a glass fiber filter paper, and a ceramic material. However, the thickness is not particularly limited and may be about 5 to 50 μm, .

The electrolyte impregnated into the negative electrode, the positive electrode and the separator includes a lithium salt and an organic solvent.

The concentration of the lithium salt may be in the range of 0.2 to 2 M, preferably 1 to 2 M, depending on various factors such as the precise composition of the electrolyte solvent mixture, the solubility of the salt, the conductivity of the dissolved salt, the charging and discharging conditions of the battery, Specifically, it may be 0.6 to 2M, more specifically 0.7 to 1.7M. If it is used at less than 0.2 M, the conductivity of the electrolyte may be lowered and electrolyte performance may be deteriorated. If it is used in excess of 2 M, the viscosity of the electrolyte may increase and the mobility of the lithium ion may be decreased. Lithium salt for example for use in the present application, LiSCN, LiBr, LiI, LiPF 6, LiBF 4, LiSO 3 CF 3, LiClO 4, LiSO 3 CH 3, LiB (Ph) 4, LiC (SO 2 CF 3) 3 and LiN (SO ₂ CF ₃₎ may include one or more from the group consisting of _2.

The organic solvent may be a single solvent or two or more mixed organic solvents. When two or more mixed organic solvents are used, it is preferable to use at least one solvent selected from two or more of the weak polar solvent group, the strong polar solvent group, and the lithium metal protective solvent group.

The weak polar solvent is defined as a solvent having a dielectric constant of less than 15 which is capable of dissolving a sulfur element in an aryl compound, a bicyclic ether, or a cyclic carbonate, and the strong polar solvent is a bicyclic carbonate, a sulfoxide compound, a lactone compound , A ketone compound, an ester compound, a sulfate compound, and a sulfite compound, wherein the lithium metal protective solvent is a saturated ether compound, an unsaturated ether compound, an N, Is defined as a solvent having a charge / discharge cycle efficiency of 50% or more to form a stable SEI (Solid Electrolyte Interface) on a lithium metal such as a heterocyclic compound containing O, S, or a combination thereof.

Specific examples of the weak polar solvent include xylene, dimethoxyethane, 2-methyltetrahydrofuran, diethyl carbonate, dimethyl carbonate, toluene, dimethyl ether, diethyl ether, diglyme or tetraglyme .

Specific examples of the strong polar solvent include hexamethyl phosphoric triamide,? -Butyrolactone, acetonitrile, ethylene carbonate, propylene carbonate, N-methylpyrrolidone, 3-methyl- Dimethyl formamide, sulfolane, dimethylacetamide, dimethyl sulfoxide, dimethyl sulfate, ethylene glycol diacetate, dimethyl sulfite, or ethylene glycol sulfite.

Specific examples of the lithium protecting solvent include tetrahydrofuran, ethylene oxide, dioxolane, 3,5-dimethylisoxazole, furan, 2-methylfuran, 1,4-oxane or 4-methyldioxolane.

One embodiment of the present application provides a battery module comprising the lithium-sulfur battery as a unit cell.

The battery module may be specifically used as a power source for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.

Hereinafter, the present invention will be described in detail by way of examples and comparative examples in order to specifically explain the present application. However, the embodiments according to the present application can be modified in various other forms, and the scope of the present application is not construed as being limited to the embodiments described below. Embodiments of the present application are provided to more fully describe the present application to those of ordinary skill in the art.

<Examples>

&Lt; Example 1 >

A porous structure made of carbon having a thickness of 100 mu m was prepared. A slurry containing 60 wt% of sulfur, 25 wt% of carbon, and 15 wt% of polyethylene oxide as a binder was prepared, and the porous structure was dip-coated on the slurry to prepare a positive electrode for a lithium-sulfur battery. The amount of sulfur supported on the prepared lithium-sulfur battery cathode was 1 mAh / cm ² .

&Lt; Example 2 >

Example 1 was carried out in the same manner as in Example 1 except that the porous structure was dip-coated on the slurry so that the amount of sulfur supported on the positive electrode for a lithium-sulfur battery in Example 1 was 3 mAh / cm ² .

&Lt; Comparative Example 1 &

A slurry containing 60 wt% sulfur, 30 wt% carbon, and 10 wt% polyethylene oxide as a cathode active material was prepared, and the slurry was coated on an aluminum current collector to prepare a positive electrode for a lithium-sulfur battery. The amount of sulfur supported on the prepared lithium-sulfur battery cathode was 1 mAh / cm ² .

&Lt; Comparative Example 2 &

Comparative Example 1 was carried out in the same manner as in Comparative Example 1 except that the slurry was coated on the aluminum current collector so that the amount of sulfur supported on the positive electrode for the lithium-sulfur battery was 3 mAh / cm ² .

<Experimental Example>

The initial discharge capacities of the positive electrode for lithium-sulfur battery according to Examples 1 to 2 and Comparative Examples 1 to 2 were evaluated and are shown in Table 1 below.

Sulfur loading per unit area Initial discharge capacity Example 1 1 mAh / cm ² 1,180 mAh / g Example 2 3 mAh / cm ² 1,150 mAh / g Comparative Example 1 1 mAh / cm ² 1,180 mAh / g Comparative Example 2 3 mAh / cm ² 200 mAh / g

As the result, the lithium in accordance with the present application - the sulfur loading of by sulfur battery, the positive electrode is carried on the positive electrode active material on at least a portion of the surface and interior of the porous structure having a conductive, 1 mAh / cm ² electrode with full aluminum house . However, when the sulfur content was increased to 3 mAh / cm ² , a capacity of 115 mAh / g could be obtained in the cell carrying the positive electrode active material on the porous structure. This is because, by using the porous structure as an electrode and a current collector, not only the structural decay of the anode is suppressed but also the electron transfer area is increased as compared with the aluminum current collector, and the reactivity with sulfur is improved. A battery can be manufactured.

Claims (18)

A conductive porous structure, and
A cathode active material supported on at least a part of the surface and the inside of the porous structure;
A positive electrode for a lithium-sulfur battery. The positive electrode for a lithium-sulfur battery according to claim 1, wherein the porous structure comprises at least one selected from the group consisting of conductive carbon and metal. The positive electrode for a lithium-sulfur battery according to claim 2, wherein the porous structure comprises carbon paper. The positive electrode for a lithium-sulfur battery according to claim 2, wherein the porous structure includes a structure in the form of a conductive carbon foam. The positive electrode for a lithium-sulfur battery according to claim 2, wherein the porous structure includes a structure in the form of aluminum foam. The positive electrode for a lithium-sulfur battery according to claim 1, wherein the porosity of the porous structure is 10 to 90%. The positive electrode for a lithium-sulfur battery according to claim 1, wherein the porous structure includes a skeleton and a void, and the skeleton has a diameter or thickness of 100 m or less. The positive electrode for a lithium-sulfur battery according to claim 7, wherein the spacing between the skeletons of the porous structure is 500 탆 or less. The positive electrode for a lithium-sulfur battery according to claim 1, wherein the porosity of the porous structure is 10 to 70% based on the total volume of the porous structure. The positive electrode for a lithium-sulfur battery according to claim 1, wherein the positive electrode active material comprises at least one selected from the group consisting of sulfur and a sulfur-carbon composite material. The positive electrode for a lithium-sulfur battery according to claim 1, wherein the positive electrode for a lithium-sulfur battery further comprises at least one selected from the group consisting of a conductive material and a binder resin. 12. The anode for a lithium-sulfur battery according to claim 11, wherein the conductive material comprises at least one selected from the group consisting of graphite-based materials, carbon black, carbon derivatives, conductive fibers, metal powders and conductive polymers. 12. The method of claim 11, wherein the binder is selected from the group consisting of poly (vinyl acetate), polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, alkylated polyethylene oxide, crosslinked polyethylene oxide, polyvinyl ether, poly (methyl methacrylate) , Polyvinylidene fluoride, copolymers of polyhexafluoropropylene and polyvinylidene fluoride, poly (ethyl acrylate), polytetrafluoroethylene polyvinyl chloride, polyacrylonitrile, polyvinylpyridine, and polystyrene. Wherein the positive electrode comprises at least one selected from the group consisting of lithium, 1) preparing a porous structural body having conductivity,
2) supporting a slurry containing a cathode active material or a cathode active material on at least a part of the surface and the interior of the porous structure
Wherein the positive electrode is a positive electrode. [Claim 16] The method of claim 14, wherein the porous structure comprises at least one selected from the group consisting of conductive carbon and metal. 15. The method of claim 14, wherein the porosity of the porous structure is 10 to 90%. 15. The method according to claim 14, wherein the slurry further comprises at least one selected from the group consisting of a conductive material, a binder and a solvent. A lithium-sulfur battery comprising the positive electrode for a lithium-sulfur battery according to any one of claims 1 to 13.

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