CN109713313B - Lithium-sulfur battery positive plate and preparation method thereof and lithium-sulfur battery - Google Patents
Lithium-sulfur battery positive plate and preparation method thereof and lithium-sulfur battery Download PDFInfo
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Abstract
The positive plate comprises a current collector and coating paste coated on the current collector, wherein the coating paste comprises activated carbon, carbon black, transition metal, sulfur, a conductive agent and a binder, and the mass ratio of the activated carbon to the carbon black to the transition metal to the sulfur to the conductive agent to the binder is 10-30: 1-10: 1-10: 50-80: 0-10: 1 to 10. The sulfur is present in the pores of the activated carbon and carbon black. The activated carbon is used as a main body for carrying sulfur, the carbon black can carry sulfur and enhance the conductivity of the cathode material, and the transition metal or the transition metal compound can play a role in fixing lithium polysulfide generated in an electrochemical reaction, inhibit the shuttle effect of polysulfide ions and improve the cycle performance of the lithium-sulfur battery. The lithium-sulfur battery cathode material disclosed by the invention has the advantages of simplicity, easiness in obtaining, easiness in large-scale preparation and the like, and can be used for obtaining a lithium-sulfur battery with long cycle, high specific capacity and high specific energy.
Description
Technical Field
The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a lithium-sulfur battery positive plate, a preparation method thereof and a lithium-sulfur battery.
Background
A lithium sulfur battery includes a positive electrode containing electroactive sulfur, a negative electrode containing lithium, an electrolyte, and a separator. The theoretical specific energy of the lithium-sulfur battery is as high as 2600 Wh/kg, and the actual specific energy is higher than that of the current commercial lithium ion battery. The obvious advantage of the specific energy makes the lithium-sulfur battery have wide potential application in special power supplies, electric automobiles, high-altitude aircrafts and the like.
The positive electrode of the lithium-sulfur battery is an important component and key technology of the lithium-sulfur battery. The positive electrode consists of two parts (current collector and paste), the current collector plays a role in conducting electrons, and the paste contains an active substance sulfur, which is a place where electrochemical reaction occurs. The electrochemical reaction at the pasted portion requires both participation of lithium ions and conduction of electrons. Generally, sulfur needs to be compounded with porous carbon to improve conductivity, so that a better capacity can be exerted. The activated carbon is one of carbon materials, takes biomass (such as wood chips, charcoal, coconut shells and the like) as a raw material, is low in price, high in density and mature in production process, but has slightly poor conductivity. The activated carbon is used as a sulfur carrier, so that the capacity of the lithium-sulfur battery is not fully developed. Therefore, how to use activated carbon as a main body for carrying sulfur to improve the capacity performance of a lithium-sulfur battery and obtain a positive electrode of the lithium-sulfur battery with excellent performances in all aspects has important practical application value.
Disclosure of Invention
The invention aims to obtain a lithium-sulfur battery positive electrode with high capacity exertion and long cycle, and provides a lithium-sulfur battery positive electrode plate, a preparation method thereof and a lithium-sulfur battery.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the positive plate of the lithium-sulfur battery comprises a current collector and paste coated on the current collector, wherein the paste comprises activated carbon, carbon black, transition metal, sulfur, a conductive agent and a binder, and the mass ratio of the activated carbon to the carbon black to the transition metal to the sulfur to the conductive agent to the binder is 10-30: 1-10: 1-10: 50-80: 0-10: 1 to 10.
The preparation method of the positive plate of the lithium-sulfur battery comprises the following steps:
mixing activated carbon and carbon black, grinding until the mixture can be completely sieved, mixing with sulfur again, grinding to enable the mixture to be completely sieved, adding carbon disulfide to submerge a solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying by air blasting, grinding and sieving, wherein the drying speed is 120-300%oC, placing the mixture in a closed container, heating for 3-24 hours, grinding and sieving to obtain a carbon-sulfur compound; mixing the above carbon-sulfur compound with transition metal, conductive agent and binderAnd dispersing the caking agent in deionized water to form slurry, coating the slurry on a current collector, and heating and drying to obtain the lithium-sulfur battery positive plate.
The lithium-sulfur battery containing the lithium-sulfur battery positive plate is a laminated battery containing the positive plate, the negative plate, a diaphragm and electrolyte; the negative plate contains lithium metal or lithium alloy; the diaphragm is a polyolefin porous diaphragm; the electrolyte is ether electrolyte.
The positive plate of the lithium-sulfur battery comprises a current collector and coating paste coated on the current collector, wherein the coating paste comprises activated carbon, carbon black, a transition metal compound, sulfur, a conductive agent and a binder, and the mass ratio of the activated carbon to the carbon black to the transition metal compound to the sulfur to the conductive agent to the binder is 10-30: 1-10: 1-10: 50-80: 0-10: 1 to 10.
The preparation method of the lithium-sulfur battery positive plate comprises the following steps:
mixing activated carbon and carbon black, grinding until the mixture can be completely sieved, mixing with sulfur again, grinding to enable the mixture to be completely sieved, adding carbon disulfide to submerge a solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying by air blasting, grinding and sieving, wherein the drying speed is 120-300%oC, placing the mixture in a closed container, heating for 3-24 hours, grinding and sieving to obtain a carbon-sulfur compound; and dispersing the carbon-sulfur compound, the transition metal compound, the conductive agent and the binder in deionized water to form slurry, coating the slurry on a current collector, and heating and drying to obtain the lithium-sulfur battery positive plate.
The lithium-sulfur battery containing the lithium-sulfur battery positive plate is a laminated battery containing the positive plate, the negative plate, a diaphragm and electrolyte; the negative plate contains lithium metal or lithium alloy; the diaphragm is a polyolefin porous diaphragm; the electrolyte is ether electrolyte.
Compared with the prior art, the invention has the beneficial effects that:
the positive plate has excellent performance, the high specific surface area active carbon is used as a main body for carrying sulfur, a certain amount of high specific surface area carbon black material is added, and a certain amount of transition metal or transition metal compound is added, so that the capacity exertion and the cycling stability of the lithium-sulfur battery can be effectively improved. Because of the high specific surface area of the carbon black, the carbon black not only plays a role of enhancing the conductivity in a composite system, but also is used as a sulfur carrier, so that the higher specific gravity of the sulfur carrier can be ensured, and the defect of poor conductivity of a carbon-sulfur composite which only takes the activated carbon as the carrier is overcome. The metal or metal compound can play a role in fixing lithium polysulfide serving as an electrochemical intermediate product, inhibit the shuttle effect of polysulfide ions, and effectively improve the capacity exertion and the cycling stability of the lithium-sulfur battery.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention. The reagents, materials and instruments used in the following description are all conventional reagents, conventional materials and conventional instruments, which are commercially available, and the reagents may be synthesized by a conventional synthesis method, if not specifically described.
The first embodiment is as follows: the embodiment describes a positive plate of a lithium-sulfur battery, which comprises a current collector and coating paste coated on the current collector, wherein the surface density of the coating paste on the current collector is 1-20 mg/cm2The coating paste comprises activated carbon, carbon black, transition metal, sulfur, a conductive agent and a binder, wherein the mass ratio of the activated carbon to the carbon black to the transition metal to the sulfur to the conductive agent to the binder is 10-30: 1-10: 1-10: 50-80: 0-10: 1 to 10.
The second embodiment is as follows: in the positive plate of the lithium-sulfur battery in the first embodiment of the present invention, the current collector is an aluminum foil or a carbon-coated aluminum foil; the specific surface area of the activated carbon is 500-3000 m2(ii)/g; the specific surface area of the carbon black is 500-3000 m2(ii)/g; the transition metal is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Pt, lanthanide or actiniumIs a metal; the sulfur is present in the pores of the activated carbon and carbon black.
The third concrete implementation mode: in the lithium-sulfur battery positive electrode sheet according to the first or second embodiment, the particle diameter of the transition metal is less than 1 μm, preferably several hundred nanometers, and most preferably several tens or several nanometers.
The fourth concrete implementation mode: a method for preparing a positive plate of a lithium-sulfur battery according to any one of the first to third embodiments, the method comprising:
mixing activated carbon and carbon black, grinding until the mixture can be completely sieved, mixing with sulfur, grinding to enable the mixture to be completely sieved, adding carbon disulfide to submerge a solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated from the surface, and 60-100 parts of sulfuroC blast drying for 6-24 h, grinding and sieving for 120-300 hoC, placing the mixture in a closed container, heating for 3-24 hours, grinding and sieving to obtain a carbon-sulfur compound; the mesh number of the used sieve is 50-300 meshes; the grinding is manual grinding or mechanical ball milling; dispersing the carbon-sulfur compound, the transition metal, the conductive agent and the binder in deionized water to form slurry, wherein the solid content of the slurry is 20-50%, coating the slurry on a current collector, and then 60-100%oAnd C, heating for 3-48 h and drying to obtain the lithium-sulfur battery positive plate.
The fifth concrete implementation mode: a lithium-sulfur battery comprising the positive electrode plate of the lithium-sulfur battery according to any one of the first to third embodiments, wherein the lithium-sulfur battery is a laminated battery comprising the positive electrode plate, the negative electrode plate, a diaphragm and an electrolyte; the negative plate contains lithium metal or lithium alloy; the diaphragm is a polyolefin porous diaphragm; the electrolyte is ether electrolyte.
The sixth specific implementation mode: the embodiment describes a positive plate of a lithium-sulfur battery, which comprises a current collector and coating paste coated on the current collector, wherein the surface density of the coating paste on the current collector is 1-20 mg/cm2The coating paste comprises activated carbon, carbon black, a transition metal compound, sulfur, a conductive agent and a binder, wherein the activated carbon, the carbon black and the transition metal compound are combinedThe mass ratio of the substance to the sulfur to the conductive agent to the binder is 10-30: 1-10: 1-10: 50-80: 0-10: 1 to 10.
The seventh embodiment: in the positive plate of the lithium-sulfur battery according to the sixth embodiment, the current collector is an aluminum foil or a carbon-coated aluminum foil; the specific surface area of the activated carbon is 500-3000 m2(ii)/g; the specific surface area of the carbon black is 500-3000 m2(ii)/g; the transition metal compound is one or more of transition metal carbide, transition metal boride, transition metal nitride, transition metal phosphide, transition metal oxide and transition metal sulfide; the sulfur is present in the pores of the activated carbon and carbon black.
The specific implementation mode is eight: in the positive electrode sheet for a lithium-sulfur battery according to the sixth or seventh embodiment, the particle diameter of the transition metal compound is less than 1 μm, preferably several hundred nm, and most preferably several tens or several nm.
The specific implementation method nine: in the positive electrode sheet of the lithium-sulfur battery according to the seventh embodiment, the transition metal carbide is TiC or Ti2C，Nb4C3，Ti3C2，V3C2，Cr3C2，Mo2TiC2，Mo2Ti2C3，V2C，Nb2C，V8C7，MoC，WC，ZrC，Mo2C，VC，Fe3One or more of C; the transition metal boride is one or more of Ni-B, Co-B, Fe-B, Ru-B, Pd-B, Ti-B, Cr-B and Zr-B; the transition metal nitride is WN, VN, TiN, W2N，LaN，Mo2One or more of N; the transition metal phosphide is Zn3P2，Cu3P2，Fe3P2，Co2P，FeP，Ni12P5，Ni2P，Ni5P4，CoP，Cu3P，Mo3P，MoP，MoP2One or more of WP; the transition metal oxide is MnO2，Fe2O3，Ti4O7，La2O3，TiO2，MoO3，ZrO2One or more of NiO; the transition metal sulfide is Co9S8，Co3S4，CoS2，FeS2，TiS2，MnS，CuS，ZnS，SnS2，NiS2，ZrS2，VS2，MoS2One or more of (a).
The detailed implementation mode is ten: a method for preparing a positive electrode plate of a lithium-sulfur battery according to any one of embodiments six to nine, the method comprising:
mixing activated carbon and carbon black, grinding until the mixture can be completely sieved, mixing with sulfur, grinding to enable the mixture to be completely sieved, adding carbon disulfide to submerge a solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated from the surface, and 60-100 parts of sulfuroC blast drying for 6-24 h, grinding and sieving for 120-300 hoC, placing the mixture in a closed container, heating for 3-24 hours, grinding and sieving to obtain a carbon-sulfur compound; the mesh number of the used sieve is 50-300 meshes; the grinding is manual grinding or mechanical ball milling; dispersing the carbon-sulfur compound, the transition metal compound, the conductive agent and the binder in deionized water to form slurry, wherein the solid content of the slurry is 20-50%, coating the slurry on a current collector, and then 60-100%oAnd C, heating for 3-48 h and drying to obtain the lithium-sulfur battery positive plate.
The concrete implementation mode eleven: a lithium-sulfur battery comprising the positive electrode plate of the lithium-sulfur battery according to any one of the sixth to ninth embodiments, wherein the lithium-sulfur battery is a laminated battery comprising a positive electrode plate, a negative electrode plate, a separator and an electrolyte; the negative plate contains lithium metal or lithium alloy; the diaphragm is a polyolefin porous diaphragm; the electrolyte is ether electrolyte.
Example 1:
mixing activated carbon (2100 m)2Per g, 20 parts by mass) and carbon black (1830 m210 parts by mass), grinding until the mixture is able to be completely sieved, mixing with sulphur (70 parts by mass), grinding to enable the mixture to be able to be groundSieving, adding carbon disulfide to submerge solid surface, standing at room temperature until carbon disulfide volatilizes completely, removing sulfur precipitated on surface, drying, grinding and sieving, 140oC, heating for 24 hours in a closed container, grinding and sieving to obtain a carbon-sulfur compound; dispersing the obtained carbon-sulfur compound, cobalt nanoparticles (3 parts by mass), a conductive agent (Super P, 5 parts by mass) and a binder (1: 1 CMC/SBR, 5 parts by mass) in deionized water to form slurry, coating the slurry on a carbon-coated aluminum foil, and then 60 parts by mass of the aluminum foiloC, heating for 48 h and drying to obtain the lithium-sulfur battery positive plate (the sulfur carrying amount is 3.5 mg/cm)2) Named as Z1.
Comparative example 1-1:
comparative example 1-1 differs from example 1 in that no Co nanoparticles were added.
Comparative examples 1 to 2:
comparative example 1-1 differs from example 1 in that no carbon black is added.
Comparative examples 1 to 3:
comparative example 1-1 differs from example 1 in that no Co nanoparticles and no carbon black were added.
Example 2:
mixing activated carbon (2950 m)210 parts by mass per g) and carbon black (530 m)21 part by mass), grinding until the mixture can be completely sieved, mixing with sulfur (50 parts by mass), grinding until the mixture can be completely sieved, adding carbon disulfide to submerge the solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying, grinding and sieving, 300 parts by massoC, heating for 3 hours in a closed container, grinding and sieving to obtain a carbon-sulfur compound; mixing the carbon-sulfur complex obtained above with Fe3Dispersing C nanoparticles (1 part by mass) and binder (1: 1 CMC/SBR, 1 part by mass) in deionized water to form slurry, coating the slurry on carbon-coated aluminum foil, and then 100 parts by mass of the aluminum foiloC, heating for 3 h and drying to obtain the lithium-sulfur battery positive plate (the sulfur carrying amount is 3.5 mg/cm)2) Named as Z2.
Comparative example 2-1:
comparative example 2-1 and practiceExample 2 differs in that Fe was not added3And C, nano-particles.
Example 3:
mixing activated carbon (620 m)210 parts by mass/g) and carbon black (2890 m)210 parts by mass), grinding until the mixture can be completely sieved, mixing with sulfur (50 parts by mass), grinding until the mixture can be completely sieved, adding carbon disulfide to submerge the solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying, grinding and sieving, 155oC, heating for 12 hours in a closed container, grinding and sieving to obtain a carbon-sulfur compound; mixing the carbon-sulfur composite obtained above with Ni2B nanoparticles (10 parts by mass), a conductive agent (MWCNT, 10 parts by mass), and a binder (2: 1 CMC/SBR, 10 parts by mass) were dispersed in deionized water to form a slurry, which was coated on a carbon-coated aluminum foil, followed by 80 parts by massoC, heating for 10 h and drying to obtain the lithium-sulfur battery positive plate (the sulfur carrying amount is 3.5 mg/cm)2) Named as Z3.
Comparative example 3-1:
comparative example 3-1 differs from example 3 in that Ni is not added2B, nano-particles.
Example 4:
mixing activated carbon (1480 m)2Per g, 20 parts by mass) and carbon black (1450 m)210 parts by mass), grinding until the mixture can be completely sieved, mixing with sulfur (80 parts by mass), grinding until the mixture can be completely sieved, adding carbon disulfide to submerge the solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying, grinding and sieving, 170oC, heating for 24 hours in a closed container, grinding and sieving to obtain a carbon-sulfur compound; dispersing the obtained carbon-sulfur compound, TiN nano-particles (5 parts by mass), conductive agent (Super P, 5 parts by mass) and binder (CMC/SBR) 1:1 in parts by mass) in deionized water to form slurry, coating the slurry on a carbon-coated aluminum foil, and then 80 parts of the slurryoC, heating for 12 h and drying to obtain the lithium-sulfur battery positive plate (the sulfur carrying amount is 3.5 mg/cm)2) Named as Z4.
Comparative example 4-1:
comparative example 4-1 is different from example 4 in that TiN nanoparticles are not added.
Comparative example 4-2:
comparative example 4-2 differs from example 4 in that no carbon black was added.
Comparative examples 4 to 3:
comparative examples 4-3 are different from example 4 in that TiN nanoparticles and carbon black were not added.
Example 5:
mixing activated carbon (1480 m)230 parts by mass per g) and carbon black (1450 m)210 parts by mass), grinding until the mixture can be completely sieved, mixing with sulfur (80 parts by mass), grinding until the mixture can be completely sieved, adding carbon disulfide to submerge the solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying, grinding and sieving, 155oC, heating for 12 hours in a closed container, grinding and sieving to obtain a carbon-sulfur compound; the carbon-sulfur composite obtained above, WP nanoparticles (5 parts by mass), a conductive agent (Super P, 5 parts by mass), and a binder (LA 133, 5 parts by mass) were dispersed in deionized water to form a slurry, which was coated on an aluminum foil, followed by 80 parts by massoC, heating for 12 h and drying to obtain the lithium-sulfur battery positive plate (the sulfur carrying amount is 6.2 mg/cm)2) Named as Z5.
Comparative example 5-1:
comparative example 5-1 differs from example 5 in that no WP nanoparticles were added.
Example 6:
mixing activated carbon (1480 m)2Per g, 20 parts by mass) and carbon black (1450 m)210 parts by mass), grinding until the mixture can be completely sieved, mixing with sulfur (80 parts by mass), grinding until the mixture can be completely sieved, adding carbon disulfide to submerge the solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying, grinding and sieving, 160 parts by massoC, heating for 24 hours in a closed container, grinding and sieving,thus obtaining the carbon-sulfur compound; mixing the carbon-sulfur composite obtained above with MnO2Dispersing nanoparticles (5 parts by mass), conductive agent (Super P, 5 parts by mass) and binder (1: 1 CMC/SBR, 5 parts by mass) in deionized water to form slurry, coating the slurry on carbon-coated aluminum foil, and 70 parts by mass of the slurryoC, heating for 20 h and drying to obtain the lithium-sulfur battery positive plate (the sulfur carrying amount is 6.2 mg/cm)2) Named as Z6.
Comparative example 6-1:
comparative example 6-1 differs from example 6 in that MnO was not added2And (3) nanoparticles.
Example 7:
mixing activated carbon (1480 m)2Per g, 20 parts by mass) and carbon black (1450 m)210 parts by mass), grinding until the mixture can be completely sieved, mixing with sulfur (80 parts by mass), grinding until the mixture can be completely sieved, adding carbon disulfide to submerge the solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying, grinding and sieving, 140 parts by massoC, heating for 24 hours in a closed container, grinding and sieving to obtain a carbon-sulfur compound; the carbon-sulfur complex obtained above and VS2Dispersing nano particles (5 parts by mass), a conductive agent (Super P, 5 parts by mass) and a binder (1: 1 CMC/SBR, 5 parts by mass) in deionized water to form slurry, coating the slurry on a carbon-coated aluminum foil, and then 80 parts by mass of the aluminum foiloC, heating for 10 h and drying to obtain the lithium-sulfur battery positive plate (the sulfur carrying amount is 6.2 mg/cm)2) Named as Z7.
Comparative example 7-1:
comparative example 7-1 differs from example 7 in that VS was not added2And (3) nanoparticles.
Lithium sulfur battery assembly and testing: the positive plate, the negative electrode (metal lithium foil) and the electrolyte (1M LiTFSI) are dissolved in a mixed solvent of DOL/DME with the volume ratio of 1:1, and the additive is 0.2M LiNO3) Assembled into a laminated battery with the mass ratio of the electrolyte to the sulfur being 3.5, and subjected to charge and discharge tests (0.2C/0.2C) with a battery test apparatus, the initial gram capacity and cycle performance (capacity reduction) of each positive electrode materialNumber of cycles to 60% of the initial capacity). The data obtained are shown in table 1. As can be seen from the battery performance of the positive electrode materials obtained in the examples and comparative examples in table 1, the positive electrode sheet of the present invention can obtain higher gram capacity and better cycle performance. The carbon black and metal or metal compound components in the cathode material effectively improve the defect of poor conductivity of the activated carbon, improve the problem of dissolution of polysulfide ions, and are beneficial to exerting gram capacity and obtaining better cycle performance.
Claims (11)
1. A lithium-sulfur battery positive plate is characterized in that: the positive plate comprises a current collector and coating paste coated on the current collector, wherein the coating paste comprises activated carbon, carbon black, transition metal, sulfur, a conductive agent and a binder, and the mass ratio of the activated carbon to the carbon black to the transition metal to the sulfur to the conductive agent to the binder is 10-30: 1-10: 1-10: 50-80: 0-10: 1-10; the specific surface area of the activated carbon is 500-3000 m2(ii)/g; the specific surface area of the carbon black is 500-3000 m2/g。
2. The positive plate of a lithium-sulfur battery according to claim 1, wherein: the current collector is an aluminum foil or a carbon-coated aluminum foil; the transition metal is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Pt, lanthanide or actinide metal; the sulfur is present in the pores of the activated carbon and carbon black.
3. The positive electrode sheet for a lithium-sulfur battery according to claim 1 or 2, wherein: the particle diameter of the transition metal is less than 1 micron.
4. A method for preparing a positive plate of a lithium-sulfur battery according to any one of claims 1 to 3, comprising: the preparation method comprises the following steps:
mixing activated carbon and carbon black, grinding until the mixture can be completely sieved, mixing with sulfur again, grinding to enable the mixture to be completely sieved, adding carbon disulfide to submerge a solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying by air blasting, grinding and sieving, wherein the drying speed is 120-300%oC, placing the mixture in a closed container, heating for 3-24 hours, grinding and sieving to obtain a carbon-sulfur compound; and dispersing the carbon-sulfur compound, the transition metal, the conductive agent and the binder in deionized water to form slurry, coating the slurry on a current collector, and heating and drying to obtain the lithium-sulfur battery positive plate.
5. A lithium-sulfur battery comprising the positive electrode sheet for a lithium-sulfur battery according to any one of claims 1 to 3, characterized in that: the lithium-sulfur battery is a laminated battery comprising a positive plate, a negative plate, a diaphragm and electrolyte; the negative plate contains lithium metal or lithium alloy; the diaphragm is a polyolefin porous diaphragm; the electrolyte is ether electrolyte.
6. A lithium-sulfur battery positive plate is characterized in that: the positive plate comprises a current collector and coating paste coated on the current collector, wherein the coating paste comprises activated carbon, carbon black, a transition metal compound, sulfur, a conductive agent and a binder, and the mass ratio of the activated carbon to the carbon black to the transition metal compound to the sulfur to the conductive agent to the binder is 10-30: 1-10: 1-10: 50-80: 0-10: 1-10; the specific surface area of the activated carbon is 500-3000 m2(ii)/g; the specific surface area of the carbon black is 500-3000 m2/g。
7. The positive plate of the lithium-sulfur battery as claimed in claim 6, wherein: the current collector is an aluminum foil or a carbon-coated aluminum foil; the transition metal compound is one or more of transition metal carbide, transition metal boride, transition metal nitride, transition metal phosphide, transition metal oxide and transition metal sulfide; the sulfur is present in the pores of the activated carbon and carbon black.
8. The positive electrode sheet for a lithium-sulfur battery according to claim 6 or 7, wherein: the transition metal compound has a particle diameter of less than 1 micron.
9. The positive plate of a lithium-sulfur battery according to claim 7, wherein: the transition metal carbide is TiC and Ti2C，Nb4C3，Ti3C2，V3C2，Cr3C2，Mo2TiC2，Mo2Ti2C3，V2C，Nb2C，V8C7，MoC，WC，ZrC，Mo2C，VC，Fe3One or more of C; the transition metal boride is one or more of Ni-B, Co-B, Fe-B, Ru-B, Pd-B, Ti-B, Cr-B and Zr-B; the transition metal nitride is WN, VN, TiN, W2N，LaN，Mo2One or more of N; the transition metal phosphide is Zn3P2，Cu3P2，Fe3P2，Co2P，FeP，Ni12P5，Ni2P，Ni5P4，CoP，Cu3P，Mo3P，MoP，MoP2One or more of WP; the transition metal oxide is MnO2，Fe2O3，Ti4O7，La2O3，TiO2，MoO3，ZrO2One or more of NiO; the transition metal sulfide is Co9S8，Co3S4，CoS2，FeS2，TiS2，MnS，CuS，ZnS，SnS2，NiS2，ZrS2，VS2，MoS2One or more of (a).
10. A method for preparing a positive plate of a lithium-sulfur battery according to any one of claims 6 to 9, comprising: the preparation method comprises the following steps:
mixing activated carbon and carbon black, grinding until the mixture can be completely sieved, mixing with sulfur again, grinding to enable the mixture to be completely sieved, adding carbon disulfide to submerge a solid surface, standing at room temperature until the carbon disulfide is completely volatilized, removing sulfur precipitated on the surface, drying by air blasting, grinding and sieving, wherein the drying speed is 120-300%oC, placing the mixture in a closed container, heating for 3-24 hours, grinding and sieving to obtain a carbon-sulfur compound; and dispersing the carbon-sulfur compound, the transition metal compound, the conductive agent and the binder in deionized water to form slurry, coating the slurry on a current collector, and heating and drying to obtain the lithium-sulfur battery positive plate.
11. A lithium-sulfur battery comprising the positive electrode sheet for a lithium-sulfur battery according to any one of claims 6 to 9, characterized in that: the lithium-sulfur battery is a laminated battery comprising a positive plate, a negative plate, a diaphragm and electrolyte; the negative plate contains lithium metal or lithium alloy; the diaphragm is a polyolefin porous diaphragm; the electrolyte is ether electrolyte.
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