A lithium-sulfur battery positive electrode material, a preparation method and application thereof

Abstract

The application discloses a lithium-sulfur battery positive electrode material, a preparation method and application thereof, and belongs to the field of lithium-sulfur batteries. An aluminum source, a zirconium source, a zinc source and a chelating agent are dissolved in methanol or ethanol to obtain a precursor solution; silica nanospheres, benzimidazole and a surfactant are dispersed in the precursor solution to perform a hydrothermal reaction; after the reaction is completed, the obtained solid is centrifuged and cleaned, then hydrogen fluoride solution is added to perform etching treatment, and the precursor is obtained through drying; the precursor and selenium powder are placed in a calcination device to perform a calcination reaction under an inert gas, and the lithium-sulfur battery positive electrode material is prepared. The lithium-sulfur battery positive electrode material has an ordered pore hydrophilic easy-infiltration structure and a polar catalytic component, and therefore can provide synergistic functions such as physical constraint, chemical anchoring and excellent polysulfide redox reaction electrocatalysis, and is especially suitable for lithium-sulfur batteries under high-sulfur-loading and poor-electrolyte conditions, and can improve the electrochemical performance and cycle stability of the battery.

Description

Technical Field

[0001] This invention belongs to the field of lithium-sulfur batteries, specifically relating to a lithium-sulfur battery cathode material, its preparation method, and its application. Background Technology

[0002] Compared to traditional lithium-ion batteries, lithium-sulfur batteries offer several advantages, including high energy density (2600 Wh / kg), low cost, and good environmental compatibility. Therefore, they are considered one of the most promising energy storage systems. However, lithium-sulfur batteries still face the "shuttle effect" problem in practical applications. This problem refers to the tendency of polysulfides to dissolve easily in ether-based electrolytes and shuttle back and forth between the positive and negative electrodes, leading to the loss of sulfur active materials and side reactions at the lithium negative electrode. To address the "shuttle effect" problem in lithium-sulfur batteries, researchers have proposed various strategies and achieved significant progress in electrochemical performance. However, these strategies typically require the use of an excess of electrolyte, i.e., a high electrolyte / sulfur ratio (E / S). A high E / S ratio, however, reduces energy density and increases electrolyte cost, thus limiting the commercial application of lithium-sulfur batteries.

[0003] Therefore, for the commercial application of lithium-sulfur batteries, it is crucial to adopt novel cathode designs to fully utilize active materials under low E / S conditions. Chinese patent document CN115602811A discloses carbon nanofibers as a self-supporting sulfur cathode host material, its preparation method, and its application. These carbon nanofibers are easily wetted, and combined with their lightweight properties, they can effectively improve the energy density of lithium-sulfur batteries. However, a disadvantage under electrolyte-deficient conditions is the low solubility of sulfur, which leads to uneven deposition of undissolved polysulfides on the carbon nanofiber surface, thus affecting the battery's cycle performance and capacity decay rate. Furthermore, another potential disadvantage of carbon nanofibers as cathode materials under electrolyte-deficient conditions is insufficient conductivity. Chinese patent document CN118173767A discloses a three-dimensional ordered structure synthesized using polystyrene spheres as a template. This structure, as a cathode material for lithium-sulfur batteries, can effectively physically adsorb lithium polysulfides, improving battery performance. However, this material is prone to problems such as hollow structure collapse, reduced dispersibility, and loss of integrity under high-temperature conditions. Therefore, it is necessary to study novel hydrophilic and easily wettable carbon materials and develop synthesis methods with simple and convenient processes. Summary of the Invention

[0004] The purpose of this invention is to provide a lithium-sulfur battery cathode material, its preparation method, and its application. This cathode material has an ordered pore hydrophilic wettable structure and polar catalytic components, which can provide synergistic functions such as physical confinement, chemical anchoring, and excellent electrocatalysis of polysulfide redox reactions. It is especially suitable for lithium-sulfur batteries under high sulfur loading and low electrolyte conditions, and can improve the electrochemical performance and cycle stability of the battery.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a method for preparing the above-mentioned lithium-sulfur battery cathode material, comprising the following steps:

[0007] (1) Dissolve the aluminum source, zirconium source, zinc source and chelating agent in methanol or ethanol to obtain a precursor solution;

[0008] (2) The silica nanospheres, benzimidazole and surfactant were dispersed in the precursor solution obtained in step (1) and subjected to hydrothermal reaction. After the reaction was completed, the obtained solid was centrifuged and washed, then hydrogen fluoride solution was added for etching treatment, and finally dried to obtain the precursor.

[0009] (3) The precursor obtained in step (2) and selenium powder are placed in a calcination device and calcined under an inert gas to obtain lithium-sulfur battery cathode material.

[0010] Preferably, in step (1), the aluminum source is one or more of aluminum acetate, aluminum nitrate, aluminum sulfate, and aluminum chloride; the zirconium source is one or more of zirconium acetate, zirconium nitrate, zirconium sulfate, and zirconium chloride; the zinc source is one or more of zinc acetate, zinc nitrate, zinc sulfate, and zinc chloride; and the chelating agent is one of gluconic acid, citric acid, and tartaric acid. The molar concentration of the zinc source in the precursor solution is 0.1–1 mol / L, the molar ratio of the sum of the aluminum source and zirconium source to the zinc source is 1–5:100, and the molar ratio of the zinc source to the chelating agent is 5–10:1.

[0011] Preferably, in step (2), the surfactant is cetyltrimethylammonium bromide or polyvinylpyrrolidone, and the mass ratio of silica nanospheres, benzimidazole and surfactant is 5-20:1-5:1; the dispersion time is 1-6 h; the hydrothermal reaction temperature is 100-180 °C and the reaction time is 6-12 h; the cleaning agent is one of water, methanol and ethanol; the mass fraction of hydrogen fluoride solution is 40-50 wt.%; the drying temperature is 60-120 °C and the time is 4-12 h.

[0012] Preferably, in step (3), the mass ratio of the precursor to selenium powder is 1:1 to 5, the inert gas is nitrogen or argon, the heating rate of the calcination reaction is controlled at 2 to 5 °C / min, the temperature is 600 to 1000 °C, and the time is 6 to 15 h.

[0013] Secondly, the present invention provides a lithium-sulfur battery cathode material composed of a three-dimensional ordered macroporous structure of zinc selenide doped with aluminum and zirconium elements. The three-dimensional ordered macroporous pore size is 86-300 nm, the aluminum and zirconium elements account for 1.2-4.9% of the metal atoms, and the zinc selenide accounts for 12.4-55.7% of the mass of the lithium-sulfur battery cathode material.

[0014] Thirdly, an application of the lithium-sulfur battery cathode material prepared according to the present invention is provided for use in lithium-sulfur battery cathodes.

[0015] Fourthly, the invention also provides an application of the lithium-sulfur battery cathode material prepared according to the present invention for use as the cathode of a lithium-sulfur battery with high sulfur loading and low electrolyte.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention prepares cathode materials through a hydrothermal reaction combined with hydrogen fluoride etching and calcination. During the preparation process, a specific chelating agent is introduced that can form stable complexes with various divalent and trivalent metal ions, maintaining good chelation effects over a wide pH range, thereby effectively inhibiting precipitation formation and ensuring uniform dispersion of metal ions. Subsequently, a 40–50 wt.% hydrogen fluoride solution exhibits a rapid etching rate, suitable for quickly etching silica nanosphere templates, leaving an ordered porous structure for the material. This ordered porous structure possesses excellent stability and dispersibility, effectively expanding its specific surface area and creating more active sites for electrochemical reactions, thus improving the material's electrochemical performance. During a suitable calcination process, the evaporation of selenium powder ensures sufficient contact between the reactant gas and the precursor material. This method promotes the uniform reaction of selenium powder, further enhancing the material's electrochemical performance. Through these optimization measures, this invention successfully prepares lithium-sulfur battery cathode materials with excellent performance. These materials possess high specific surface area and good electrochemical activity, playing a crucial role in improving battery specific capacity and cycle stability.

[0018] 2. The lithium-sulfur battery cathode material provided by this invention possesses an ordered three-dimensional macroporous structure (3DOM), which promotes electrolyte permeation and charge / mass transport, thus ensuring uniform electrolyte distribution. The considerable porosity of the 3DOM framework (86–300 nm) also facilitates sulfur containment and buffers volume expansion during sodium sulfur / desulfurization. Furthermore, the 3DOM structure provides a high surface area and abundant active sites for the chemical reaction between aluminum-zirconium co-doped zinc selenide and polysulfides, playing a crucial role in improving the cycle life of high-sulfur-loading lithium-sulfur batteries.

[0019] 3. In the lithium-sulfur battery cathode material prepared by this invention, zinc selenide suppresses the shuttle effect through strong chemisorption, which helps to improve the electrochemical utilization and stability of the sulfur cathode. At the same time, zinc selenide can accelerate the electrocatalytic conversion of polysulfides, thereby improving the redox reaction kinetics of the battery. Meanwhile, aluminum-zirconium dual doping can improve the electronic structure of the sulfur host material, thereby improving its conductivity. This improvement in conductivity helps to promote the capture / diffusion of polysulfides and the deposition / oxidation process of Li2S, slowing down the volume expansion during charge and discharge, thereby enhancing the charge and discharge capacity and cycle stability of the battery under low electrolyte conditions.

[0020] 4. In summary, the lithium-sulfur battery cathode material prepared by the method of this invention exhibits outstanding performance in lithium-sulfur battery applications. At a sulfur loading of 3.5 mg / cm³, it performs particularly well. 2 Under conditions of E / S=5μL / mg and 0.2C, the initial specific capacity is as high as 1248.1~1289.4mAh / g, and the capacity retention rate is 82.8%~85.9% after 100 cycles. Under 1C conditions, the initial specific capacity is as high as 972.6~986.2mAh / g, and the capacity retention rate is 82.2%~84.9% after 100 cycles. Attached Figure Description

[0021] Figure 1 The image shows a scanning electron microscope (SEM) image of the lithium-sulfur battery cathode material prepared in Example 1.

[0022] Figure 2 The image shows the X-ray diffraction (XRD) pattern of the lithium-sulfur battery cathode material prepared in Example 1.

[0023] Figure 3 Cyclic stability of the lithium-sulfur battery cathode material prepared in Example 1 at 0.2C. Detailed Implementation

[0024] The present invention will be described in detail below with reference to embodiments and comparative examples, but the present invention is not limited thereto. Example 1

[0025] (1) Dissolve aluminum acetate, zirconium chloride, zinc sulfate and gluconic acid in 100 mL of methanol to obtain a precursor solution; wherein the molar concentration of zinc sulfate in the precursor solution is 0.1 mol / L, the molar ratio of the sum of aluminum source and zirconium source to zinc sulfate is 1:20, and the molar ratio of zinc sulfate to gluconic acid is 5:1.

[0026] (2) Disperse silica nanospheres, benzimidazole and polyvinylpyrrolidone in the precursor solution obtained in step (1) for 4 h, and then perform hydrothermal reaction at 100 °C for 6 h. After the reaction is completed, centrifuge the reaction solution, wash it with water, remove the silica spheres with 48 wt.% hydrogen fluoride solution and vacuum dry at 70 °C for 6 h to obtain the precursor; wherein the mass ratio of silica nanospheres, benzimidazole and surfactant is 15:5:1.

[0027] (3) Take 100mg of precursor and 500mg of selenium powder obtained in step (2) and calcine them at 800℃ with a heating rate of 4℃ / min under argon atmosphere and keep them at 800℃ for 15h to obtain lithium-sulfur battery cathode material (3DOM Al / Zr-ZnSe).

[0028] The lithium-sulfur battery cathode material obtained in this embodiment has a three-dimensional ordered macropore diameter of 86-257 nm, aluminum zirconium accounts for 4.9% of the metal atoms, and zinc selenide accounts for 12.4% of the mass of the lithium-sulfur battery cathode material. Example 2

[0029] (1) Dissolve aluminum source (aluminum acetate, aluminum nitrate, aluminum sulfate, aluminum chloride), zirconium source (zirconium acetate, zirconium nitrate), zinc nitrate and tartaric acid in 100 mL of ethanol to obtain a precursor solution; wherein, the molar concentration of zinc nitrate in the precursor solution is 1 mol / L, the molar ratio of the sum of aluminum source and zirconium source to zinc nitrate is 3:100, and the molar ratio of zinc nitrate to tartaric acid is 10:1;

[0030] (2) Disperse silica nanospheres, benzimidazole and hexadecyltrimethylammonium bromide in the precursor solution obtained in step (1) for 1 h, and then perform hydrothermal reaction at 130 °C for 12 h. After the reaction is completed, centrifuge the reaction solution, wash it with ethanol, remove the silica nanospheres with 40 wt.% hydrogen fluoride solution, and vacuum dry at 120 °C for 4 h to obtain the precursor; wherein the mass ratio of silica nanospheres, benzimidazole and surfactant is 5:1:1;

[0031] (3) Take 5g of precursor and 5g of selenium powder obtained in step (2) and calcine them at 1000℃ under nitrogen atmosphere at a heating rate of 2℃ / min and keep warm for 10h to obtain 3DOM Al / Zr-ZnSe.

[0032] The lithium-sulfur battery cathode material obtained in this embodiment has a three-dimensional ordered macropore diameter of 100-300 nm, aluminum zirconium accounts for 3.2% of the metal atoms, and zinc selenide accounts for 55.7% of the mass of the lithium-sulfur battery cathode material. Example 3

[0033] (1) Dissolve aluminum source (aluminum nitrate, aluminum sulfate), zirconium source (zirconium acetate, zirconium nitrate, zirconium sulfate, zirconium chloride), zinc source (zinc acetate, zinc nitrate, zinc sulfate, zinc chloride) and citric acid in 100 mL of methanol to obtain a precursor solution; wherein, the molar concentration of zinc source in the precursor solution is 0.8 mol / L, the molar ratio of the sum of aluminum source and zirconium source to zinc source is 1:100, and the molar ratio of zinc source to citric acid is 8:1;

[0034] (2) Disperse silica nanospheres, benzimidazole and polyvinylpyrrolidone in the precursor solution obtained in step (1) for 6 h, and then perform hydrothermal reaction at 180 °C for 8 h. After the reaction is completed, centrifuge the reaction solution, wash it with methanol, remove the silica spheres with 50 wt.% hydrogen fluoride solution and vacuum dry at 60 °C for 12 h to obtain the precursor; wherein the mass ratio of silica nanospheres, benzimidazole and surfactant is 20:1:1.

[0035] (3) Take 1g of precursor and 2g of selenium powder obtained in step (2) and calcine them at 600℃ under nitrogen atmosphere at a heating rate of 5℃ / min and keep at the temperature for 6h to obtain 3DOM Al / Zr-ZnSe.

[0036] The lithium-sulfur battery cathode material obtained in this embodiment has a three-dimensional ordered macropore diameter of 90-270 nm, aluminum zirconium accounts for 1.1% of the metal atoms, and zinc selenide accounts for 32.5% of the mass of the lithium-sulfur battery cathode material. Comparative Example 1

[0037] This comparative example does not include aluminum or zirconium sources, but all other processes are the same as in Example 1.

[0038] The lithium-sulfur battery cathode material obtained in this comparative example has a three-dimensional ordered macropore diameter of 92–250 nm, and zinc selenide accounts for 16.4% of the mass of the lithium-sulfur battery cathode material. Comparative Example 2

[0039] This comparative example does not include an aluminum source, but all other processes are the same as in Example 1.

[0040] The lithium-sulfur battery cathode material obtained in this comparative example has a three-dimensional ordered macropore diameter of 90–245 nm, and zinc selenide accounts for 16.2% of the mass of the lithium-sulfur battery cathode material. Comparative Example 3

[0041] In this comparative example, conventional carbon black was used as the cathode material, and the cathode preparation process and performance testing were consistent with those in the example. Comparative Example 4

[0042] This comparative example uses silica nanospheres of 800–1000 nm, and all other steps are the same as in Example 1.

[0043] The lithium-sulfur battery cathode material obtained in this comparative example has a three-dimensional ordered macropore diameter of 763–981 nm, with aluminum and zirconium accounting for 5.2% of the metal atoms and zinc selenide accounting for 13.3% of the mass of the lithium-sulfur battery cathode material.

[0044] Cathode preparation:

[0045] 0.1 g of sulfur powder was dissolved in 10 mL of carbon disulfide under heating and stirring at 40 °C until a homogeneous solution (i.e., a sulfur-containing solution) was obtained. Then, 150 μL of the above solution was added dropwise to the cathode materials prepared in the examples and comparative examples. These materials were then dried on a heating platform at 60 °C, and the sulfur loading was confirmed to be 3.5 mg / cm³ using a 0.01 g balance. 2 .

[0046] Performance testing:

[0047] 1cm 2 A C2032 coin cell was assembled using a positive electrode, a Celgard 2300 separator, and a lithium foil negative electrode, along with 17.5 μL of electrolyte (a mixed solution of 1.0 mol / L LiTFSI and 0.2 mol / L LiNO3 with 1,3-dioxolane and 1,2-dimethoxyethane (w / w, 1 / 1)). On a CT-4008-5A 6V system, a fixed potential range (1.7–2.8 V vs. Li...) was established. + Cyclic tests were conducted on the battery at different current densities (Li). The test current density was 0.2C, and the test voltage range was 1.7-2.8V. The test results are shown in Table 1.

[0048]

[0049] Figure 1The image shows a SEM image of the lithium-sulfur battery cathode material prepared in Example 1. It can be observed that the 3DOM structure in the cathode material is constructed using silica nanospheres as templates. After removing the silica nanospheres with hydrogen fluoride solution, an interconnected large porous structure is formed, with three-dimensional ordered macropores ranging from 86 to 257 nm in diameter. The hydrophilic surface in the 3DOM structure has a strong affinity for the electrolyte, improving surface wettability and electrolyte permeability to the cathode material structure. Enhanced electrolyte permeability strengthens the contact between sulfur and lithium ions, promoting polysulfide conversion and improving the overall reaction. Furthermore, the considerable porosity of the 3DOM framework facilitates sulfur containment and buffers volume expansion during sodium-sulfurization / desulfurization. Additionally, the 3DOM structure provides a high surface area and abundant active sites for the chemical reaction between aluminum-zirconium co-doped zinc selenide and polysulfides. These structural advantages are particularly suitable for high sulfur loading and low electrolyte concentration conditions, playing a crucial role in improving the electrochemical performance and cycle stability of lithium-sulfur batteries.

[0050] The lithium-sulfur battery cathode material obtained in Example 1 was subjected to XRD testing, such as... Figure 2 As shown. From Figure 2 As can be seen, the sharp peaks shown are consistent with the PDF standard card number, indicating that the synthesized material is ZnSe. In addition, the double doping of Al and Zr did not change the crystal form of ZnSe, and no corresponding diffraction peaks of Al2O3 and ZrO2 were observed, proving that the synthesized material was successfully doped with Al and Zr.

[0051] The prepared lithium-sulfur battery cathode material was assembled into a lithium-sulfur battery in a glove box, and electrochemical tests were performed at 0.2C and 1C current densities under conditions of 1.7-2.8V. Figure 3 As shown in Table 1, the lithium-sulfur battery prepared in Example 1 exhibited an initial specific capacity of 1289.4 mAh / g at 0.2C, with a capacity retention of 85.9% after 100 cycles. At 1C, the initial specific capacity was 986.2 mAh / g, with a capacity retention of 84.9% after 100 cycles, demonstrating excellent charge-discharge performance and cycle stability under high sulfur loading and lean electrolyte conditions. The same tests were performed on the materials from Examples 2 and 3, and the results were similar to those of Example 1 (Table 1).

[0052] Compared with the sample in Comparative Example 2, the sample in this example has a higher initial specific capacity and stronger cycling ability, which indicates that dual doping is more conducive to promoting the diffusion of polysulfides and reducing charge transfer resistance.

[0053] Compared to the sample in Comparative Example 1, the Example exhibited superior performance under 0.2C charge-discharge conditions. This result confirms the optimization effect of Al and Zr dual-element doping on the electronic structure of the sulfur-based material, enhancing the conductivity of ZnSe. This improvement helps accelerate the conversion process of polysulfides and promotes their electrochemical reactions, thereby effectively improving sulfur utilization, accelerating the redox reaction rate, and ultimately enhancing the battery's charge-discharge capacity and cycle stability. Compared to the sample in Comparative Example 2, the Example not only had a higher initial specific capacity but also exhibited stronger cycle capability, demonstrating that dual doping with Al and Zr is more advantageous than single doping.

[0054] The comparison shows that the capacity difference between Comparative Example 3 and Example 1 exceeds 830 mAh / g. This indicates that under conditions of high sulfur loading and low electrolyte concentration, the carbon black material, lacking catalytic components, cannot effectively suppress the shuttle effect. The limited porosity is also not conducive to sulfur containment. Its non-hydrophilic properties fail to improve surface wettability and electrolyte permeability to the cathode structure, thus resulting in a low specific capacity. Compared to Example 1, the capacity retention rate of Example 4 is more than 38% lower. This indicates that excessive pore size will damage the structural stability of the material and reduce mass transfer efficiency, thereby significantly reducing cycle stability.

[0055] The specific embodiments described above provide a further detailed explanation of the present invention; however, these descriptions should not be construed as limiting the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a lithium-sulfur battery cathode material, comprising the following steps: (1) Dissolve the aluminum source, zirconium source, zinc source and chelating agent in methanol or ethanol to obtain a precursor solution; (2) The silica nanospheres, benzimidazole and surfactant were dispersed in the precursor solution obtained in step (1) and subjected to hydrothermal reaction. After the reaction was completed, the obtained solid was centrifuged and washed, then hydrogen fluoride solution was added for etching treatment, and finally dried to obtain the precursor. (3) The precursor obtained in step (2) and selenium powder are placed in a calcination device and calcined under an inert gas to obtain lithium-sulfur battery cathode material; The lithium-sulfur battery cathode material is composed of a three-dimensional ordered macroporous structure of zinc selenide doped with aluminum and zirconium. The pore size of the three-dimensional ordered macropores is 86-300 nm. The proportion of aluminum and zirconium in the metal atoms is 1.2-4.9%, and the proportion of zinc selenide in the lithium-sulfur battery cathode material is 12.4-55.7%.

2. The method for preparing the lithium-sulfur battery cathode material according to claim 1, characterized in that, In step (1), the aluminum source is one or more of aluminum acetate, aluminum nitrate, aluminum sulfate, and aluminum chloride; the zirconium source is one or more of zirconium acetate, zirconium nitrate, zirconium sulfate, and zirconium chloride; the zinc source is one or more of zinc acetate, zinc nitrate, zinc sulfate, and zinc chloride; and the chelating agent is one of gluconic acid, citric acid, and tartaric acid. The molar concentration of the zinc source in the precursor solution is 0.1–1 mol / L, the molar ratio of the sum of the aluminum source and zirconium source to the zinc source is 1–5:100, and the molar ratio of the zinc source to the chelating agent is 5–10:

1.

3. The method for preparing the lithium-sulfur battery cathode material according to claim 1, characterized in that, In step (2), the surfactant is cetyltrimethylammonium bromide or polyvinylpyrrolidone, and the mass ratio of silica nanospheres, benzimidazole and surfactant is 5-20:1-5:1; the dispersion time is 1-6 h; the hydrothermal reaction temperature is 100-180℃ and the reaction time is 6-12 h; the cleaning agent is one of water, methanol and ethanol; the mass fraction of hydrogen fluoride solution is 40-50 wt.%; the drying temperature is 60-120℃ and the time is 4-12 h.

4. The method for preparing the lithium-sulfur battery cathode material according to claim 1, characterized in that, In step (3), the mass ratio of the precursor to selenium powder is 1:1 to 5, the inert gas is nitrogen or argon, the heating rate of the calcination reaction is controlled at 2 to 5 °C / min, the temperature is 600 to 1000 °C, and the time is 6 to 15 h.

5. A lithium-sulfur battery cathode material prepared by the preparation method according to any one of claims 1-4, characterized in that, The lithium-sulfur battery cathode material is composed of a three-dimensional ordered macroporous structure of zinc selenide doped with aluminum and zirconium. The pore size of the three-dimensional ordered macropores is 86-300 nm. The proportion of aluminum and zirconium in the metal atoms is 1.2-4.9%, and the proportion of zinc selenide in the lithium-sulfur battery cathode material is 12.4-55.7%.

6. An application of the lithium-sulfur battery cathode material as described in claim 5, characterized in that, The aforementioned lithium-sulfur battery cathode material is used as the cathode material in lithium-sulfur batteries.

7. The application of the lithium-sulfur battery cathode material according to claim 6, characterized in that, The aforementioned lithium-sulfur battery cathode material is used as the cathode material in lithium-sulfur batteries with high sulfur loading and low electrolyte.

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