CN112820859A - Preparation method of lithium-sulfur battery cathode and lithium-sulfur battery using cathode - Google Patents
Preparation method of lithium-sulfur battery cathode and lithium-sulfur battery using cathode Download PDFInfo
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Abstract
The invention discloses a preparation method of a lithium-sulfur battery cathode and a lithium-sulfur battery using the cathode, and belongs to the technical field of lithium batteries. The preparation method of the lithium-sulfur battery negative electrode comprises the following steps: a current collector is taken as a substrate and is compounded with the lithium metal negative electrode component 1 to form a combined body 1; compounding the assembly 1 as a substrate and a lithium metal negative electrode assembly 2 to form an assembly 2; then taking the assembly 2 as a substrate, taking the surface of the assembly 2 which is not combined with the lithium metal negative electrode assembly 2 as a composite surface, and compositing the composite surface with the lithium metal negative electrode assembly 3 to form an assembly 3; and compounding the assembly 3 as a substrate and a lithium metal negative electrode assembly 4 to form the negative electrode of the lithium-sulfur battery. The lithium metal negative electrode assemblies 1 to 4 are different in size and position of being bonded to the current collector. And (3) laminating the negative electrode unit, the positive electrode unit and the isolating membrane of the lithium-sulfur battery, injecting electrolyte and packaging to form the lithium-sulfur battery. The lithium metal cathode can improve the energy density of the lithium-sulfur battery and reduce the cost of the lithium-sulfur battery on the premise of improving the cycle life of the lithium-sulfur battery.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a preparation method of a lithium-sulfur battery cathode and a lithium-sulfur battery using the cathode.
Background
With the development of electric automobiles, new energy storage and electronic industry, high energy density lithium batteries are an urgent need in the market. Lithium sulfur batteries have been attracting continuous research and attention in the scientific and industrial sectors due to their extremely high theoretical energy density. At present, the negative electrode of the lithium-sulfur battery is mainly a lithium metal battery, and the lithium metal negative electrode is considered as a holy cup of the negative electrode of the lithium battery due to the extremely high theoretical specific capacity (3860mAh/g) and the low potential (-3.04V). However, in the lithium-sulfur battery, the lithium metal negative electrode still has more problems at present, such as the high reactivity of the lithium metal negative electrode continuously reacts with the electrolyte, and a large amount of lithium is consumed; the polysulfides shuttled from the positive electrode can also corrode the lithium negative electrode, consuming lithium. The consumption of lithium accelerates the deterioration of the performance of the lithium sulfur battery. In practical studies, the performance of lithium-sulfur batteries can be significantly improved by increasing the amount of lithium metal negative electrode (i.e., increasing the ratio of negative electrode to positive electrode surface capacity). But this results in a significant reduction in the energy density of the battery on the one hand and a significant increase in the cost of the battery on the other hand. In the actual soft package failure analysis of the lithium-sulfur battery, certain difference is easily found in the corrosion area of the negative electrode of the lithium-sulfur battery, and the serious area is mainly the middle of an electrode plate and the end close to the electrode lug. Therefore, the lithium metal cathode is designed according to the failure characteristics of the lithium sulfur battery, and the lithium sulfur battery has important significance for the development of the lithium sulfur battery with high performance, high energy density and low cost.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a preparation method of a lithium-sulfur battery negative electrode and a lithium-sulfur battery using the negative electrode. The lithium-sulfur battery pole prepared by the method can reduce the usage amount of a lithium cathode in the lithium-sulfur battery and improve the energy density of the lithium-sulfur battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a lithium-sulfur battery negative electrode comprises the following steps:
s1, compounding the current collector serving as a substrate with the lithium metal negative electrode assembly 1 in a rolling mode to form a combined body 1;
s2, compounding the assembly 1 serving as a substrate with the lithium metal negative electrode assembly 2 in a rolling mode to form an assembly 2;
s3, taking the assembly 2 as a substrate, taking the surface of the assembly 2 which is not combined with the lithium metal negative electrode assembly 2 as a composite surface, and compositing the composite surface with the lithium metal negative electrode assembly 3 in a rolling mode to form an assembly 3;
s4, compounding the assembly 3 serving as a substrate with the lithium metal negative electrode assembly 4 in a rolling mode to form an assembly 4; the assembly 4 is a negative electrode of a lithium sulfur battery.
Further, in the step S1, the lithium metal negative electrode assembly 1 is a metal lithium strip with or without surface pretreatment; the current collector is made of foam copper, foam nickel, foam carbon, copper foil, copper mesh, carbon-coated copper foil, carbon-coated copper mesh or carbon cloth.
Still further, in the rolling compounding process of the current collector and the lithium metal negative electrode assembly 1 in step S1, the lithium metal negative electrode assembly 1 and the current collector are aligned near the tab end region; the width of the lithium metal negative electrode assembly 1 is equal to the width of the current collector, the width dimension error of the lithium metal negative electrode assembly and the width dimension error of the current collector are not more than +/-5 mm, and the length of the lithium metal negative electrode assembly is 1/3-2/3 of the length of the current collector.
Further, the lithium metal negative electrode assembly 2 in the step S2 has the same composition as the lithium metal negative electrode assembly 1 in S1; the thickness of the lithium metal negative electrode component 2 is 50-90% of the thickness of the lithium metal negative electrode component 1. If the length of the lithium metal negative electrode component is too large, more negative electrodes are needed, the cost and the energy density of the battery are influenced, the size is too small, the area with serious lithium metal corrosion cannot be covered, and the performance is not obviously improved. Thinner lithium metal sheets are used in the areas of slight corrosion, i.e. the thickness of the lithium metal negative electrode assembly 2 is smaller than the thickness of the lithium metal negative electrode assembly 1 in the areas remote from the tab ends.
Furthermore, in the rolling compounding process of the assembly 1 and the lithium metal negative electrode assembly 2 in step S2, the lithium metal negative electrode assembly 2 and the current collector are aligned away from the tab end region; the width of the lithium metal negative electrode assembly 2 is equal to the width of the current collector, the length of the lithium metal negative electrode assembly is 1/3-2/3 of the length of the current collector, and the sum of the length of the lithium metal negative electrode assembly 2 and the length of the lithium metal negative electrode assembly 1 is equal to the length of the current collector.
Further, the composition and size of the lithium metal negative electrode assembly 3 in the step S3 and the lithium metal negative electrode assembly 1 in the step S1 are consistent; in the step S3, the surface of the assembly 2 not bonded to the lithium metal negative electrode assembly 2 is used as a composite surface, and is composited with the lithium metal negative electrode assembly 3 by a rolling method; during the compounding process, the lithium metal negative electrode assembly 3 and the current collector are aligned near the tab end region and are symmetrically aligned with the lithium metal negative electrode assembly 1 on the other side of the assembly 2.
Further, the composition and size of the lithium metal negative electrode assembly 4 in the step S4 and the lithium metal negative electrode assembly 2 in the step S2 are consistent; the assembly 3 in the S4 is compounded with the lithium metal negative electrode assembly 4 in a rolling mode; during the compounding process, the lithium metal negative electrode assembly 4 and the current collector are placed in alignment away from the tab end region and maintained in symmetrical alignment with the lithium metal negative electrode assembly 2 on the other side of the assembly 3.
A lithium sulfur battery of the lithium sulfur battery cathode prepared by the lithium sulfur battery cathode preparation method comprises a cathode unit, an anode unit, a separation film and electrolyte; laminating the negative electrode, the positive electrode unit and the isolating membrane of the lithium-sulfur battery, injecting electrolyte, and packaging to form the lithium-sulfur battery; the negative electrode unit is a lithium-sulfur battery negative electrode formed by rolling through the following steps S1-S4:
S1, taking the current collector as a substrate, aligning the lithium metal negative electrode assembly 1 with a tab end region close to the current collector, and compounding to form a combined body 1 in a rolling mode;
s2, taking the assembly 1 as a substrate, aligning the lithium metal negative electrode assembly 2 and a current collector far away from a tab end region, and compounding to form the assembly 2 in a rolling mode;
s3, taking the assembly 2 as a substrate, and taking the surface of the assembly 2 not combined with the lithium metal negative electrode assembly 2 as a composite surface, wherein the lithium metal negative electrode assembly 3 is aligned with the tab end region close to the current collector and is symmetrically aligned with the lithium metal negative electrode assembly 1 on the other surface of the assembly 2; forming a combination body 3 in a composite manner by a rolling manner;
s4, taking the assembly 3 as a substrate, aligning the lithium metal negative electrode assembly 4 with the current collector far away from the tab end region, keeping the lithium metal negative electrode assembly 4 symmetrically aligned with the lithium metal negative electrode assembly 2 on the other surface of the assembly 3, and compounding to form the assembly 4 in a rolling mode; the combination 4 is a cathode of the lithium-sulfur battery;
further, the positive electrode unit comprises a positive electrode active material, a conductive agent, a binder and a current collector, wherein the positive electrode active material is one or a compound of several of elemental sulfur powder, a sulfur-carbon composite material, lithium sulfide and polysulfide.
The conductive agent may be any one that can be used in the art, such as carbon black, graphite, graphene, carbon nanotubes, activated carbon, carbon fibers, and the like. The binder may comprise a thermoplastic or thermosetting resin, polyethylene, polypropylene, Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), styrene-butadiene rubber, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, ethylene-tetrafluoroethylene copolymer, polychlorotrifluoroethylene, vinylidene fluoride-pentafluoropropylene copolymer, propylene-tetrafluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, vinylidene fluoride-perfluoromethylvinyl ether-tetrafluoroethylene copolymer, ethylene-acrylic acid copolymer, etc., however, the binder is not limited to these, and those that can be used as a binder in the art may be used.
The isolating membrane mainly comprises polypropylene, polyethylene, a polypropylene and polyethylene composite membrane, a cellulose diaphragm, polyoxyethylene and the like. However, the separator is not limited to these, and those that can be used in the art as separators may be used.
The lithium salt for electrolyte can be selected from LiCl, LiBr, LiI and LiClO4、LiBF4、、LiPF6、LiCF3SO3、LiCF3CO2、LiAsF6、LiSbF6、LiAlCl4、LiSO3CH3、LiSO3CF3、LiC(CF3SO2)3、LiN(CF3SO2)2、LiN(C2F5SO2)2、LiN(SO2F)2，One or more of the group consisting of lithium imide salts. In one embodiment of the present invention, the lithium salt may preferably be an imide lithium salt. The concentration of the lithium salt may be 0.1M to 4M and preferably 0.5M to 2.0M. The non-aqueous organic solvent is a material capable of well dissolving the lithium salt, and it is preferable that an aprotic organic solvent such as N-methyl-2-pyrrolidone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, γ -butyrolactone, 1, 2-dimethoxyethane, 1, 2-diethoxyethane, 1-ethoxy-2-methoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, dimethyl sulfoxide, 1, 3-dioxolane, 4-methyl-1, 3-dioxane, diethyl ether, formamide, dimethylformamide, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphotriester, phosphate triester, di-methyl ether, di-N-ethyltoluene, Trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1, 3-dimethyl-2-imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ethers, methyl propionate, or ethyl propionate, and these may be used alone or in the form of a mixed solution of two or more kinds. In one embodiment of the invention, the aprotic solvent is preferably dioxolane, dimethyl ether or a combination thereof.
Still further, in the step S1, the lithium metal negative electrode assembly 1 is a metal lithium strip with or without surface pretreatment; the surface capacity of the lithium metal negative electrode assembly 1 is compared with the surface capacity of the positive electrode unit, namely the N/P ratio is 1.5-4.5; the current collector is foam copper, foam nickel, foam carbon, copper foil, copper mesh, carbon-coated copper foil, carbon-coated copper mesh or carbon cloth;
the width of the lithium metal negative electrode assembly 1 is equal to the width of the current collector, the width dimension error of the lithium metal negative electrode assembly and the current collector is not more than +/-5 mm, and the length of the lithium metal negative electrode assembly is 1/3-2/3 of the length of the current collector;
the lithium metal negative electrode assembly 2 in the step S2 has the same composition as the lithium metal negative electrode assembly 1 in S1;
the width of the lithium metal negative electrode assembly 2 is consistent with that of the lithium metal negative electrode assembly 1, the width dimension error of the lithium metal negative electrode assembly 2 and the lithium metal negative electrode assembly 1 is not more than +/-5 mm, the length of the lithium metal negative electrode assembly is 1/3-2/3 of the length of the current collector, and the sum of the length of the lithium metal negative electrode assembly 2 and the length of the lithium metal negative electrode assembly 1 is equal to the length of the current collector; the thickness of the lithium metal negative electrode component 2 is 50% -90% of that of the lithium metal negative electrode component 1;
the lithium metal negative electrode component 3 and the lithium metal negative electrode component 1 have the same components and sizes;
the lithium metal negative electrode assembly 4 in the step S4 and the lithium metal negative electrode assembly 2 in the step S2 have the same composition and size.
Compared with the prior art, the invention has the following beneficial effects:
according to the failure characteristics of the lithium metal negative electrode in the lithium sulfur battery, the negative electrode is formed by compounding lithium metal sheets with different thicknesses and a collector, wherein the lithium metal sheet with the thicker thickness is adopted in a severe corrosion area, and the thinner lithium metal sheet is adopted in a slight corrosion area. Compared with the traditional thin metal lithium cathode, the lithium-sulfur cathode can obviously improve the specific capacity of the lithium-sulfur cathode battery and improve the cycle performance.
Drawings
FIG. 1 is a schematic diagram of a process for preparing a negative electrode for a lithium sulfur battery according to the present invention.
Fig. 2 is a side view (from the tab end) of the assembly 2 during the fabrication of a negative electrode for a lithium sulfur battery according to the present invention.
Fig. 3 is a side view (from the tab end) of the assembly 3 during the production of the negative electrode of a lithium sulfur battery according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific embodiment in combination with the attached drawings. It should be understood by those skilled in the art that the specific embodiments are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
A copper mesh having a thickness of 15um was die-cut into pieces of current collectors having a length of 108mm and a width of 69 mm. And die-cutting the lithium negative electrodes with the thicknesses of 80um, 72um, 50um and 40um into negative electrode pieces with the lengths and the widths of 108mm, 72 mm, 69mm,36 mm and 69mm, and 54 mm and 69mm respectively. The lithium metal negative electrode is prepared according to the method for preparing the negative electrode of the lithium sulfur battery, and the lithium sulfur battery is prepared by using the negative electrode.
Example 1:
as shown in fig. 1 to 3, a method for preparing a negative electrode of a lithium sulfur battery includes the steps of:
s1, taking the current collector as a substrate, aligning the lithium metal negative electrode assembly 1 with a tab end region close to the current collector, and compounding to form a combined body 1 in a rolling mode; wherein the size of the lithium metal negative electrode assembly 1 is 72 × 69 × 0.08 mm;
s2, taking the assembly 1 as a substrate, aligning the lithium metal negative electrode assembly 2 and a current collector far away from a tab end region, and compounding to form the assembly 2 in a rolling mode; wherein the size of the lithium metal negative electrode component 2 is 36 × 69 × 0.05 mm;
s3, using the assembly 2 as a substrate, and using the surface of the assembly 2 not combined with the lithium metal negative electrode assembly 2 as a composite surface, aligning the lithium metal negative electrode assembly 3 with the tab end region close to the current collector, and keeping symmetrical alignment with the lithium metal negative electrode assembly 1 on the other surface of the assembly 2; forming a combination body 3 in a composite manner by a rolling manner; wherein, the size of the lithium metal negative electrode component 3 is the same as that of the lithium metal negative electrode component 1;
S4, taking the assembly 3 as a substrate, aligning the lithium metal negative electrode assembly 4 with the current collector far away from the tab end region, keeping the lithium metal negative electrode assembly 4 symmetrically aligned with the lithium metal negative electrode assembly 2 on the other surface of the assembly 3, and compounding to form the assembly 4 in a rolling mode; the combination 4 is a cathode of the lithium-sulfur battery; wherein the lithium metal negative electrode assembly 4 has the same size as the lithium metal negative electrode assembly 2.
Example 2:
example 2 differs from example 1 only in that: the dimensions of the lithium metal negative electrode assembly 1 to the lithium metal negative electrode assembly 4 in the present embodiment are different from those of embodiment 1, specifically see table 1.
Example 3:
example 3 differs from example 1 only in that: the dimensions of the lithium metal negative electrode assembly 1 to the lithium metal negative electrode assembly 4 in the present embodiment are different from those of embodiment 1, specifically see table 1.
Example 4:
example 4 differs from example 3 only in that: the lithium metal negative electrode assemblies 2 and 4 in this example are different from those in example 3, specifically see table 1.
Example 5:
example 5 differs from example 3 only in that: the lithium metal negative electrode assemblies 2 and 4 in this example are different from those in example 3, specifically see table 1.
The dimensions of the lithium metal negative electrode assembly 1 to the lithium metal negative electrode assembly 4 in examples 1 to 3 are shown in table 1:
TABLE 1 specification and size of the metal negative electrode assembly in different embodiments
In examples 1 to 5, the positive electrode material is preferably a sulfur-carbon composite material.
The preparation method of the anode comprises the following steps: 65% of sulfur powder, 20% of SP, 5% of CMC and 15% of SBR were mixed with a solvent by a mixer to prepare a slurry. Then preparing the mixture into a single-sided sulfur-carrying surface by a coating machineThe density was 4.1mg/cm2The electrode slice is prepared into the electrode slice by die cutting, and the die cutting size of the electrode slice is 105 x 68 mm.
The electrolyte is prepared by mixing 1, 3-Dioxolane (DOL) and ethylene glycol dimethyl ether (DME) according to the volume ratio of 1:1, lithium salt is lithium bistrifluoromethanesulfonylimide with the concentration of 1mol/L, and additive is 0.2mol/L lithium nitrate.
The barrier film is a 25um thick PP membrane.
The lithium metal negative electrode sheets prepared in examples 1 to 3, the positive electrode sheets prepared in the above manner and the separators were assembled into electrode sheets having 5 layers in a lamination manner, and then liquid injection, packaging and testing were performed according to the liquid injection amount having a liquid-sulfur ratio of 3.5ml/g, to obtain 5 lithium-sulfur batteries.
Comparative example 1:
lithium metal negative electrodes having a length and width and a thickness of 108 and 69 and 0.08mm were roll compounded directly with current collectors having the same dimensions as those in the examples (front and back sides). The positive electrode, electrolyte, separator and assembly test processes thereof were similar to the examples.
Comparative example 2:
lithium metal negative electrodes having a length and width and a thickness of 108 and 69 and 0.05mm were roll compounded directly with current collectors having the same dimensions as those in the examples (front and back sides). The positive electrode, electrolyte, separator and assembly test processes thereof were similar to the examples.
The lithium sulfur batteries manufactured in examples 1 to 3 were compared with the lithium sulfur batteries manufactured in comparative examples 1 to 2 in terms of performance, and the results are shown in table 2:
TABLE 2 comparison of example and comparative example data
As can be seen from table 2, the examples have higher energy density compared to comparative examples 1 and 2, while the cycle life is comparable to comparative example 1. The cycle performance is significantly better than that of comparative example 2.
The lithium metal negative electrode assembly 1 to the lithium metal negative electrode assembly 4 in the above embodiments may also be a surface-pretreated lithium metal tape, and a specific pretreatment method may be to use a metal halide such as tin chloride, tin fluoride, silver chloride, copper chloride, an inorganic compound, an organic polymer, or a composite of the above materials. The current collector can also be selected from foam copper, foam nickel, foam carbon, copper foil, carbon-coated copper mesh or carbon cloth. The positive active material can also be one or a compound of several substances of elemental sulfur powder, lithium sulfide and polysulfide, the surface capacity of the lithium metal negative electrode component 1 and the surface capacity ratio of the positive electrode unit, namely the N/P ratio can also be any value between 1.5 and 4.5 or between 1.5 and 4.5 according to the requirement of actually prepared lithium-sulfur battery model parameters.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A preparation method of a negative electrode of a lithium-sulfur battery is characterized by comprising the following steps:
s1, compounding the current collector serving as a substrate with the lithium metal negative electrode assembly 1 in a rolling mode to form a combined body 1;
s2, compounding the assembly 1 serving as a substrate with the lithium metal negative electrode assembly 2 in a rolling mode to form an assembly 2;
s3, taking the assembly 2 as a substrate, taking the surface of the assembly 2 which is not combined with the lithium metal negative electrode assembly 2 as a composite surface, and compositing the composite surface with the lithium metal negative electrode assembly 3 in a rolling mode to form an assembly 3;
s4, compounding the assembly 3 serving as a substrate with the lithium metal negative electrode assembly 4 in a rolling mode to form an assembly 4; the assembly 4 is a negative electrode of a lithium sulfur battery.
2. The method of claim 1, wherein the method comprises the steps of: in the step S1, the lithium metal negative electrode assembly 1 is a metal lithium strip with or without surface pretreatment; the current collector is made of foam copper, foam nickel, foam carbon, copper foil, copper mesh, carbon-coated copper foil, carbon-coated copper mesh or carbon cloth.
3. The method of claim 1, wherein the method comprises the steps of: in the rolling mode compounding process of the current collector and the lithium metal negative electrode assembly 1 in the step S1, the lithium metal negative electrode assembly 1 and the current collector are aligned near the tab end region; the width of the lithium metal negative electrode assembly 1 is equal to the width of the current collector, and the length of the lithium metal negative electrode assembly is 1/3-2/3 of the length of the current collector.
4. The method of claim 1, wherein the method comprises the steps of: the lithium metal negative electrode assembly 2 in the step S2 has the same composition as the lithium metal negative electrode assembly 1 in S1; the thickness of the lithium metal negative electrode component 2 is 50-90% of the thickness of the lithium metal negative electrode component 1.
5. The method of claim 1, wherein the method comprises the steps of: in the rolling mode compounding process of the assembly 1 and the lithium metal negative electrode assembly 2 in the step S2, the lithium metal negative electrode assembly 2 and the current collector are aligned away from the tab end region; the width of the lithium metal negative electrode assembly 2 is equal to the width of the current collector, the length of the lithium metal negative electrode assembly is 1/3-2/3 of the length of the current collector, and the sum of the length of the lithium metal negative electrode assembly 2 and the length of the lithium metal negative electrode assembly 1 is equal to the length of the current collector.
6. The method of claim 1, wherein the method comprises the steps of: the compositions and the sizes of the lithium metal negative electrode assembly 3 in the step S3 and the lithium metal negative electrode assembly 1 in the step S1 are consistent; in the step S3, the surface of the assembly 2 not bonded to the lithium metal negative electrode assembly 2 is used as a composite surface, and is composited with the lithium metal negative electrode assembly 3 by a rolling method; during the compounding process, the lithium metal negative electrode assembly 3 and the current collector are aligned near the tab end region and are symmetrically aligned with the lithium metal negative electrode assembly 1 on the other side of the assembly 2.
7. The method of claim 1, wherein the method comprises the steps of: the compositions and the sizes of the lithium metal negative electrode assembly 4 in the step S4 and the lithium metal negative electrode assembly 2 in the step S2 are consistent; in the step S4, the assembly 3 and the lithium metal negative electrode assembly 4 are combined in a rolling manner; during the compounding process, the lithium metal negative electrode assembly 4 and the current collector are placed in alignment away from the tab end region and maintained in symmetrical alignment with the lithium metal negative electrode assembly 2 on the other side of the assembly 3.
8. A lithium sulfur battery using a negative electrode for a lithium sulfur battery prepared by the method for preparing a negative electrode for a lithium sulfur battery according to any one of claims 1 to 7, characterized in that: the lithium-sulfur battery comprises a negative electrode unit, a positive electrode unit, a separation film and electrolyte; laminating the negative electrode, the positive electrode unit and the isolating membrane of the lithium-sulfur battery, injecting electrolyte, and packaging to form the lithium-sulfur battery; the negative electrode unit is a lithium-sulfur battery negative electrode formed by rolling through the following steps S1-S4:
S1, taking the current collector as a substrate, aligning the lithium metal negative electrode assembly 1 and the current collector close to a tab end region, and compounding to form a combined body 1 in a rolling mode;
s2, taking the assembly 1 as a substrate, aligning the lithium metal negative electrode assembly 2 and a current collector far away from a tab end region, and compounding to form the assembly 2 in a rolling mode;
s3, using the assembly 2 as a substrate, and using the surface of the assembly 2 not combined with the lithium metal negative electrode assembly 2 as a composite surface, aligning the lithium metal negative electrode assembly 3 with the tab end region close to the current collector, and keeping symmetrical alignment with the lithium metal negative electrode assembly 1 on the other surface of the assembly 2; forming a combination body 3 in a composite manner by a rolling manner;
s4, taking the assembly 3 as a substrate, aligning the lithium metal negative electrode assembly 4 with the current collector far away from the tab end region, keeping the lithium metal negative electrode assembly 4 symmetrically aligned with the lithium metal negative electrode assembly 2 on the other surface of the assembly 3, and compounding to form the assembly 4 in a rolling mode; the assembly 4 is a negative electrode of a lithium sulfur battery.
9. A lithium sulfur battery using the negative electrode for a lithium sulfur battery according to claim 8, wherein: the positive electrode unit comprises a positive electrode active material, a conductive agent, a binder and a current collector, wherein the positive electrode active material is one or a compound of several of elemental sulfur powder, a sulfur-carbon composite material, lithium sulfide and polysulfide.
10. A lithium sulfur battery using the negative electrode for a lithium sulfur battery according to claim 8, wherein: in the step S1, the lithium metal negative electrode assembly 1 is a metal lithium strip with or without surface pretreatment; the surface capacity of the lithium metal negative electrode assembly 1 is compared with the surface capacity of the positive electrode unit, namely the N/P ratio is 1.5-4.5; the current collector is foam copper, foam nickel, foam carbon, copper foil, copper mesh, carbon-coated copper foil, carbon-coated copper mesh or carbon cloth;
the width of the lithium metal negative electrode assembly 1 is equal to the width of the current collector, and the length of the lithium metal negative electrode assembly is 1/3-2/3 of the length of the current collector;
the lithium metal negative electrode assembly 2 in the step S2 has the same composition as the lithium metal negative electrode assembly 1 in S1;
the width of the lithium metal negative electrode assembly 2 is consistent with that of the lithium metal negative electrode assembly 1, the length of the lithium metal negative electrode assembly 2 is 1/3-2/3 of the length of the current collector, and the sum of the length of the lithium metal negative electrode assembly 2 and the length of the lithium metal negative electrode assembly 1 is equal to the length of the current collector; the thickness of the lithium metal negative electrode component 2 is 50% -90% of that of the lithium metal negative electrode component 1;
the lithium metal negative electrode component 3 and the lithium metal negative electrode component 1 have the same components and sizes;
the lithium metal negative electrode assembly 4 in the step S4 and the lithium metal negative electrode assembly 2 in the step S2 have the same composition and size.
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