CN111403714A - Lithium-sulfur battery positive electrode material, preparation method, positive plate and lithium-sulfur battery - Google Patents

Lithium-sulfur battery positive electrode material, preparation method, positive plate and lithium-sulfur battery Download PDF

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CN111403714A
CN111403714A CN202010228545.3A CN202010228545A CN111403714A CN 111403714 A CN111403714 A CN 111403714A CN 202010228545 A CN202010228545 A CN 202010228545A CN 111403714 A CN111403714 A CN 111403714A
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lithium
positive electrode
catalyst
sulfur battery
oxide
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吕伟
王若琛
邓亚茜
罗冲
杨全红
康飞宇
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Shenzhen International Graduate School of Tsinghua University
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The invention provides a positive electrode material of a lithium-sulfur battery, which comprises a conductive substrate, elemental sulfur, a first catalyst and a second catalyst which are positioned on the surface of the conductive substrate, and the first catalyst and the second catalyst are in mutual contact. The lithium-sulfur battery positive electrode material provided by the invention can reduce polysulfide shuttling effect. The invention also provides a preparation method of the lithium-sulfur battery positive electrode material, a positive electrode plate and a lithium-sulfur battery comprising the positive electrode plate.

Description

Lithium-sulfur battery positive electrode material, preparation method, positive plate and lithium-sulfur battery
Technical Field
The invention relates to the field of lithium-sulfur batteries, in particular to a lithium-sulfur battery positive electrode material, a preparation method of the lithium-sulfur battery positive electrode material, a positive plate and a lithium-sulfur battery.
Background
Lithium-sulfur battery with ultrahigh theoretical specific capacity (2600 wh.Kg)-1) It is the new generation of most promising lithium battery. However, lithium sulfur batteries can generate intermediate states, such as polysulfides, during charging and discharging. Among them, polysulfides have a shuttle effect in that polysulfides are easily dissolved in an electrolyte and shuttle to the negative electrode of a battery with the electrolyte, resulting in the loss of active materials. The shuttling effect of polysulfides greatly affects the cycling performance of lithium sulfur batteries and thus leads to a decline in the capacity of lithium sulfur batteries.
In order to solve this problem, at present, on one hand, carbon-based materials are modified, for example, functional groups are grafted on the surface or heteroatom doping is performed, so as to enhance the adsorption capacity of the carbon matrix to polysulfide; another aspect is the inhibition of polysulfide dissolution by the formation of stronger bonds and interactions between metal oxides, sulfides and polysulfides. However, the above method merely anchors the sulfide to the positive electrode material by physical or chemical adsorption, and if the sulfide is not converted into lithium sulfide in time, the active sites on the surface of the positive electrode material are occupied, so that the polysulfide adsorbed on the positive electrode material is limited, and the shuttle effect cannot be prevented well.
Disclosure of Invention
In view of the above, there is a need for a positive electrode material for lithium-sulfur batteries, which can reduce the shuttling effect of polysulfides.
In addition, a preparation method of the lithium-sulfur battery positive electrode material is also needed to be provided.
In addition, it is also necessary to provide a positive electrode sheet including the positive electrode material for a lithium sulfur battery.
In addition, it is also necessary to provide a lithium sulfur battery including the positive electrode sheet.
The invention provides a positive electrode material of a lithium-sulfur battery, which comprises a conductive substrate, elemental sulfur, a first catalyst and a second catalyst which are positioned on the surface of the conductive substrate, and the first catalyst and the second catalyst are in mutual contact.
The invention also provides a preparation method of the lithium-sulfur battery positive electrode material, which comprises the following steps:
adding the conductive substrate suspension and a surfactant into a solvent, and mixing to form a first dispersion liquid;
adding a first metal salt into the first dispersion liquid, mixing and heating to obtain a second dispersion liquid;
adding a second metal salt and a sulfur-containing precursor into the second dispersion liquid, mixing and heating to obtain a third dispersion liquid;
separating and drying the solid phase of the third dispersion liquid to obtain a conductive composite material; and
and mixing elemental sulfur with the conductive composite material to obtain the lithium-sulfur battery positive electrode material.
The invention also provides a positive plate which comprises the lithium-sulfur battery positive electrode material, and the positive plate also comprises a current collector, a conductive agent and a binder, wherein the lithium-sulfur battery positive electrode material is coated on the surface of the current collector.
The invention also provides a lithium-sulfur battery comprising the positive plate.
The positive electrode material of the lithium-sulfur battery provided by the invention can simultaneously provide strong chemisorption and sufficient catalytic active sites, and can induce polysulfide, namely intermediate products of the lithium-sulfur battery in a circulating process to be uniformly deposited on the positive electrode material. Wherein the first catalyst and the second catalyst have chemisorption on polysulfides. Meanwhile, the lithium sulfur battery positive electrode material includes the first catalyst and the second catalyst, so that the lithium sulfur battery positive electrode material has a bidirectional catalytic effect. The first catalyst and the second catalyst can promote oxidation and reduction reactions of polysulfides respectively, and shuttle effect of polysulfides is reduced. In addition, the first catalyst and the second catalyst are respectively composed of different materials, and the first catalyst and the second catalyst are in close contact with each other to form a heterostructure, so that electrons are transmitted at the interface of the first catalyst and the second catalyst, and the redox reaction in the lithium sulfur battery can be accelerated.
Drawings
Fig. 1 is a schematic structural view of a positive electrode material for a lithium-sulfur battery according to a preferred embodiment of the present invention.
Fig. 2 is a flow chart illustrating a method for preparing a positive electrode material for a lithium-sulfur battery according to a preferred embodiment of the present invention.
Fig. 3 is a cycle test chart of the lithium sulfur battery assembled with the lithium sulfur battery positive electrode materials in example 1, comparative example 1, and comparative example 2 of the present invention.
Description of the main elements
Positive electrode material 100 for lithium-sulfur battery
Conductive substrate 10
Elemental sulfur 20
First catalyst 30
Second catalyst 40
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, a positive electrode material 100 for a lithium-sulfur battery according to a preferred embodiment of the present invention includes a conductive substrate 10, elemental sulfur 20, and a first catalyst 30 and a second catalyst 40 on a surface of the conductive substrate 10.
In the present embodiment, the conductive substrate 10 has a conductivity of more than 105S/m, the specific surface area of the conductive substrate 10 is more than 10m2g-1. Wherein the specific surface area of the conductive substrate 10 is greater than a certain value in order to provide sufficient loading sites for the first catalyst 30 and the second catalyst 40. If the contents of the first catalyst 30 and the second catalyst 40 are decreased, the specific surface area of the conductive substrate 10 may be decreased accordingly. The conductive substrate 10 accounts for 1-30% of the lithium-sulfur battery cathode material 100 by mass. The conductive substrate 10 may be reduced graphene oxide.
In the embodiment, the proportion of the elemental sulfur 20 in the lithium-sulfur battery positive electrode material 100 is 40-90% by mass. Preferably, the proportion of the elemental sulfur 20 in 100 mass percent of the lithium-sulfur battery positive electrode material is 40-60%.
The first catalyst 30 and the second catalyst 40 are in contact with each other. The first catalyst 30 and the second catalyst 40 account for 0.5-30% of the lithium sulfur battery cathode material 100 by mass. The proportions of the first catalyst 30 and the second catalyst 40 in the total mass of the first catalyst 30 and the second catalyst 40 are both greater than or equal to 10%. The ratio of the total mass of the first catalyst 30 and the second catalyst 40 to the total mass of the first catalyst 30, the second catalyst 40, and the conductive substrate 10 is 1% or more. Within a certain range, the lower the ratio of the total mass of the first catalyst 30 and the second catalyst 40 to the mass of the lithium sulfur battery positive electrode material 100, the better. If the contents of the first catalyst 30 and the second catalyst 40 are increased, the overall energy density of the manufactured lithium sulfur battery is lower.
The first catalyst 30 and the second catalyst 40 are used to catalyze oxidation (charge) and reduction (discharge) reactions, respectively, in a lithium sulfur battery. In the present embodiment, the first catalyst 30 includes at least one of titanium oxide, manganese oxide, vanadium oxide, aluminum oxide, tin oxide, zinc oxide, cobalt oxide, zirconium oxide, niobium oxide, molybdenum oxide, magnesium oxide, iron oxide, lanthanum oxide, calcium oxide, and cesium oxide. In the present embodiment, the second catalyst 40 includes at least one of cobalt sulfide, molybdenum sulfide, tin sulfide, tungsten sulfide, titanium sulfide, manganese sulfide, iron sulfide, nickel sulfide, vanadium sulfide, copper sulfide, and zinc sulfide. The particle sizes of the first catalyst 30 and the second catalyst 40 are both 5nm to 5 μm. Preferably, the particle size of each of the first catalyst 30 and the second catalyst 40 is 10nm to 500 nm. The particle size of the first catalyst 30 and the particle size of the second catalyst 40 affect the respective catalytic activities. In principle, the smaller the particle size of the first catalyst 30 and the particle size of the second catalyst 40, the higher the catalytic activity, and vice versa, the lower the catalytic activity.
Referring to fig. 2, a method for preparing the positive electrode material 100 of the lithium-sulfur battery according to the preferred embodiment of the present invention includes the following steps:
in step S11, the conductive substrate 10 suspension and the surfactant are added to the solvent and mixed to form a first dispersion.
Wherein the concentration of the conductive substrate 10 in the conductive substrate 10 suspension is 0.05-10g L-1The concentration of the surfactant is 0.5-10mol L-1。
The surfactant may be cetyltrimethylammonium bromide, and the like.
The conductive substrate 10 suspension may be Graphene Oxide (GO) suspension, carbon nanotube suspension, porous carbon, carbon fiber suspension, or the like.
The solvent may be oxalic acid or the like.
In this embodiment, the conductive substrate 10 suspension is a GO suspension, and correspondingly, the surfactant is a cationic surfactant, namely cetyl trimethyl ammonium bromide, so as to better combine the negatively charged graphene oxide with the positively charged cationic surfactant. In other embodiments, the cationic surfactant may not be used if other conductive substrates are selected.
Step S12, adding a first metal salt into the first dispersion, mixing and heating to obtain a second dispersion.
Since the first catalyst 30 includes at least one of titanium oxide, manganese oxide, vanadium oxide, aluminum oxide, tin oxide, zinc oxide, cobalt oxide, zirconium oxide, niobium oxide, molybdenum oxide, magnesium oxide, iron oxide, lanthanum oxide, calcium oxide, and cesium oxide, the first metal salt may be a salt solution corresponding to the first catalyst 30 described above. For example, when the first catalyst 30 is titanium oxide, the first metal salt may be tetrabutyl titanate.
Wherein the concentration of the first metal salt is 0.1-1mol L-1. The heating temperature is 50-200 ℃, and the heating time is 2-48 h. The heating mode can be water bath or oil bath. After heating, the first metal salt is oxidized into the first catalyst 30, and the first catalyst 30 is supported on the conductive substrate 10.
And step S13, adding a second metal salt and a sulfur-containing precursor into the second dispersion, mixing and heating to obtain a third dispersion.
Since the second catalyst 40 includes at least one of cobalt sulfide, molybdenum sulfide, tin sulfide, tungsten sulfide, titanium sulfide, manganese sulfide, iron sulfide, nickel sulfide, vanadium sulfide, copper sulfide, and zinc sulfide, the second metal salt may be a salt solution corresponding to the second catalyst 40. For example, when the second catalyst 40 is nickel sulfide, the second metal salt may be nickel acetate.
The sulfur-containing precursor can be thiourea, urea and the like.
Wherein the concentration of the second metal salt is 0.1-1mol L-1The concentration of the sulfur-containing precursor is 0.1-2mol L-1. The heating temperature is 100-300 ℃, and the heating time is 2-48 h. Said heatedThe mode may be hydrothermal. After heating, the second metal salt is oxidized into the second catalyst 40, and the second catalyst 40 is supported on the conductive substrate 10 and forms a heterostructure with the first catalyst 30.
And step S14, separating the solid phase of the third dispersion liquid and drying to obtain the conductive composite material.
Step S15, mixing elemental sulfur 20 with the conductive composite material, thereby obtaining the lithium-sulfur battery positive electrode material 100.
Wherein the mixing may be a hot melt process.
The invention also provides a positive plate, which comprises the lithium-sulfur battery positive electrode material 100, a current collector, a conductive agent and a binder, wherein the lithium-sulfur battery positive electrode material 100 is coated on the surface of the current collector. In the present embodiment, the conductive agent includes at least one of small particle conductive carbon black (Super-P), porous activated carbon, graphene, and carbon nanotubes.
The invention also provides a lithium-sulfur battery comprising the positive plate.
The present invention will be specifically described below by way of examples and comparative examples.
Example 1
Firstly, 800mg of reduced graphene oxide is added into deionized water with the concentration of 400m L to obtain Graphene Oxide (GO) suspension with the concentration of 2mg m L-1, and the mixture is subjected to ultrasonic treatment for 1 hour.
And step two, adding 3.2g of hexadecyl trimethyl ammonium bromide into the GO suspension in the step one, fully stirring for 30min, and carrying out ultrasonic treatment for 3 h.
In the third step, 80M of L1M oxalic acid solution was added to the suspension in the second step under vigorous stirring, thereby obtaining a first dispersion.
Fourthly, 800 mu L of tetrabutyl titanate was added to the first dispersion, mixed and heated at 50 ℃ for 20 hours with stirring, thereby obtaining a second dispersion.
And a fifth step of adding 0.704g (4mmol) of nickel acetate into the second dispersion liquid under stirring, stirring for 30min, adding 0.912g (10mmol) of thiourea, and continuing to stir for 30 min.
And sixthly, transferring the mixture obtained in the fifth step into a reaction kettle of 100m L, and preserving the temperature for 20 hours at 200 ℃ to obtain a third dispersion liquid.
And seventhly, performing suction filtration on the third dispersion, washing the third dispersion for several times by using deionized water and ethanol, placing the third dispersion in a vacuum oven at the temperature of 60 ℃ for drying to obtain black powder, placing the black powder in a tube furnace, heating the black powder to 900 ℃ at the speed of 5 ℃/min under the argon atmosphere, and preserving heat for 2 hours to obtain the conductive composite material.
And eighthly, weighing a certain amount of nano sulfur powder according to the mass ratio of the elemental sulfur 20 to the conductive composite material of 8:2, mixing the nano sulfur powder with the conductive composite material, grinding the mixture for 30min, putting the mixture into a tubular furnace, heating the mixture to 155 ℃ at the speed of 2 ℃/min in the argon atmosphere, preserving the heat for 10h, heating the mixture to 230 ℃ at the speed of 5 ℃/min, preserving the heat for 30min, and naturally cooling the mixture to obtain the sulfur-containing lithium-sulfur battery cathode material.
Comparative example 1
Comparative example 1 differs from example 1 in that: comparative example 1 the fifth step in example 1 was omitted.
Comparative example 2
Comparative example 2 differs from example 1 in that comparative example 2 omits 800 μ L tetrabutyl titanate into the first dispersion in the fourth step of example 1.
The positive electrode material for lithium-sulfur battery prepared in example 1 included TiO2-Ni3S2a/rGO bi-directional catalyst (i.e., the first catalyst 30 and the second catalyst 40).
The positive electrode material for the lithium-sulfur battery prepared in comparative example 1 included TiO2the/rGO one-way catalyst (i.e., the first catalyst 30).
The positive electrode material for lithium-sulfur battery prepared in comparative example 2 included Ni3S2the/rGO one-way catalyst (i.e., the second catalyst 40).
The positive electrode sheets were prepared using the positive electrode materials for lithium sulfur batteries prepared in example 1, comparative example 1, and comparative example 2, respectively. Specifically, the positive electrode material of the lithium-sulfur battery, a conductive agent and a binder are mixed according to the ratio of 8:1:1, the mixture is uniformly ground in a mortar, the mixture is transferred to a weighing bottle, a proper amount of N-methyl pyrrolidone (NMP) is dripped into the weighing bottle, the mixture is stirred for about 4 hours to obtain slurry, the slurry is coated on a carbon-coated aluminum foil by using a scraper, then the carbon-coated aluminum foil is placed into a vacuum oven at the temperature of 60 ℃ for drying overnight to obtain a positive electrode plate material, and the positive electrode plate material is punched into a positive electrode plate.
The invention also adopts the anode plate prepared by the method to be assembled into the button lithium-sulfur battery in a glove box filled with argon according to the following sequence that the anode shell, the gasket, the anode plate, the electrolyte, the diaphragm, the electrolyte, the lithium plate, the gasket, the elastic sheet and the cathode shell are arranged in the glove box, and the electrolyte on two sides of the diaphragm is 20 mu L, wherein the electrolyte solvent is a mixed solvent of ethylene glycol dimethyl ether (DME) and 1, 3-dioxolane (DO L) with the volume ratio of 1:1, the lithium salt is 1M bis (trifluoromethyl) sulfonyl imide lithium (L iTFSI), and the additive is 1% of L iNO3And subsequently, compacting the battery by adopting a button cell sealing machine under the positive electrode shell and under the negative electrode shell for testing.
The assembled lithium sulfur battery was subjected to electrochemical performance test and cycle performance test. As shown in FIG. 3, the lithium sulfur batteries prepared in example 1, comparative example 1 and comparative example 2 all had a charge/discharge current density of 1.67A/g (1C) and a specific initial discharge capacity of 1066mA h g-1. The capacity retention of the lithium-sulfur battery prepared in example 1 was 88% after the number of cycles was 100, while the capacity retention of comparative examples 1 and 2 was 70% and 59%, respectively, after the number of cycles was 100.
It can be seen that the lithium-sulfur battery prepared in example 1 shows no significant attenuation during the whole cycle, and the positive plate prepared from the positive electrode material of the lithium-sulfur battery prepared in example 1 is also illustrated, and the lithium-sulfur battery assembled from the positive plate has higher cycle stability than that of comparative example 1 and comparative example 2.
The invention has the following advantages:
the lithium sulfur battery positive electrode material 100 can simultaneously provide strong chemisorption and sufficient catalytic active sites and induce uniform deposition of polysulfides, i.e., intermediate products of the lithium sulfur battery during cycling, on the positive electrode material. Wherein the first catalyst 30 and the second catalyst 40 have a chemisorption effect on polysulfides.
2, the lithium sulfur battery positive electrode material 100 includes the first catalyst 30 and the second catalyst 40, so that the lithium sulfur battery positive electrode material 100 has a bidirectional catalytic effect. The first catalyst 30 and the second catalyst 40 can promote oxidation and reduction reactions of polysulfides, respectively, reducing shuttling effects of polysulfides.
3, the first catalyst 30 and the second catalyst 40 are respectively composed of different materials, and the first catalyst 30 and the second catalyst 40 are in close contact with each other to form a heterostructure, so that electrons are transported at the interface of the two, and the redox reaction inside the lithium sulfur battery can be accelerated.
Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. The positive electrode material of the lithium-sulfur battery is characterized by comprising a conductive substrate, elemental sulfur, a first catalyst and a second catalyst which are positioned on the surface of the conductive substrate, and the first catalyst and the second catalyst are in contact with each other.
2. The lithium-sulfur battery positive electrode material of claim 1, wherein the first catalyst comprises at least one of titanium oxide, manganese oxide, vanadium oxide, aluminum oxide, tin oxide, zinc oxide, cobalt oxide, zirconium oxide, niobium oxide, molybdenum oxide, magnesium oxide, iron oxide, lanthanum oxide, calcium oxide, and cesium oxide, and the second catalyst comprises at least one of cobalt sulfide, molybdenum sulfide, tin sulfide, tungsten sulfide, titanium sulfide, manganese sulfide, iron sulfide, nickel sulfide, vanadium sulfide, copper sulfide, and zinc sulfide, and wherein the particle size of each of the first catalyst and the second catalyst is 5nm to 5 μm.
3. The positive electrode material for a lithium-sulfur battery according to claim 1, wherein the first catalyst and the second catalyst account for 0.5 to 30% by mass of the positive electrode material for a lithium-sulfur battery.
4. The positive electrode material for a lithium-sulfur battery of claim 1, wherein the conductive substrate has a conductivity greater than 105S/m, the specific surface area of the conductive substrate is more than 10m2g-1。
5. The positive electrode material for a lithium-sulfur battery as defined in claim 1, wherein the elemental sulfur accounts for 40 to 90% by mass of the positive electrode material for a lithium-sulfur battery.
6. A method for preparing a positive electrode material for a lithium-sulfur battery according to any one of claims 1 to 5, comprising the steps of:
adding the conductive substrate suspension and a surfactant into a solvent, and mixing to form a first dispersion liquid;
adding a first metal salt into the first dispersion liquid, mixing and heating to obtain a second dispersion liquid;
adding a second metal salt and a sulfur-containing precursor into the second dispersion liquid, mixing and heating to obtain a third dispersion liquid;
separating and drying the solid phase of the third dispersion liquid to obtain a conductive composite material; and
and mixing elemental sulfur with the conductive composite material to obtain the lithium-sulfur battery positive electrode material.
7. The method of claim 6, wherein the conductive substrate suspension has a concentration of 0.05 to 10g L-1The concentration of the surfactant is 0.5-10mol L-1The first mentionedThe concentration of the first metal salt and the concentration of the second metal salt are both 0.1-1mol L-1The concentration of the sulfur-containing precursor is 0.1-2mol L-1。
8. The method of claim 6, wherein the heating temperature after the first metal salt and the first dispersion liquid are mixed is 50-200 ℃ and the heating time is 2-48h, and the heating temperature after the second metal salt, the sulfur-containing precursor and the second dispersion liquid are mixed is 100-300 ℃ and the heating time is 2-48 h.
9. A positive electrode sheet comprising the lithium sulfur battery positive electrode material as defined in any one of claims 1 to 5, further comprising a current collector, a conductive agent, and a binder, the lithium sulfur battery positive electrode material being coated on a surface of the current collector.
10. A lithium-sulfur battery comprising the positive electrode sheet according to claim 9.
CN202010228545.3A 2020-03-27 2020-03-27 Lithium-sulfur battery positive electrode material, preparation method, positive plate and lithium-sulfur battery Pending CN111403714A (en)

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US20220238860A1 (en) * 2021-01-22 2022-07-28 Saudi Arabian Oil Company Nanocomposite and method of making catalyst for high loading and utilization of sulfur at elevated temperatures
CN113131095A (en) * 2021-04-16 2021-07-16 清华大学深圳国际研究生院 Isolation layer, preparation method thereof and lithium-sulfur battery
CN113839044A (en) * 2021-11-29 2021-12-24 广东工业大学 Lithium-sulfur battery positive electrode, preparation method thereof and lithium-sulfur battery

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