CN114230836B - Modified lithium-sulfur battery diaphragm and preparation method thereof - Google Patents
Modified lithium-sulfur battery diaphragm and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a modified lithium sulfur battery diaphragm and a preparation method thereof, wherein the modified lithium sulfur battery diaphragm is formed by coating modified lithium sulfur battery diaphragm slurry, and the preparation method of the modified lithium sulfur battery diaphragm slurry comprises the following steps: the method comprises the steps of adding monosaccharide or oligosaccharide into a modified lithium sulfur battery diaphragm to inhibit shuttling of lithium polysulfide in the discharging process of the lithium sulfur battery, improving the cycle performance of the battery, prolonging the service life of the battery and improving the cycle efficiency.
Description
Technical Field
The invention belongs to the technical field of battery diaphragms, and particularly relates to a modified lithium-sulfur battery diaphragm and a preparation method thereof.
Background
With the vigorous development of new energy industry, the energy density requirement of the market on batteries is higher and higher. At present, the lithium ion battery has become an industrial standard pole when the energy density reaches 300Wh/kg, but the anxiety of the market on endurance still cannot be relieved. Moreover, the current battery cost is high, and the requirement of low cost cannot be met. Therefore, new generation battery technology is urgently needed in the market, cost is reduced, efficiency is improved, energy density of the battery is further improved, endurance anxiety is relieved, and battery cost is reduced.
Lithium sulfur batteries are widely studied and focused as a new generation battery technology due to their high energy density and low cost characteristics. Unlike traditional lithium ion battery, the lithium sulfur battery has positive electrode reacting sulfur simple substance and lithium ion to generate lithium polysulfide, and negative electrode reacting lithium simple substance loses electron to generate lithium ion in discharging process; during charging, the positive electrode reaction and the negative electrode reaction are reversely carried out, and the positive electrode material and the negative electrode material return to the simple substance state; the separator used in the lithium-sulfur battery has no obvious difference from the lithium ion battery, and has the core function of separating the sulfur anode from the lithium cathode to form the lithium-sulfur battery.
However, lithium sulfur batteries have not been commercialized late due to some technical problems, the main of which is the production of polysulfides dissolved in the electrolyte during the battery cycle, the shuttling of polysulfides between the electrodes, and slow conversion kinetics of the dissolved lithium polysulfide, resulting in a rapid capacity decay during the battery cycle, failing to meet the use requirements. The current common modification method for the lithium sulfur battery separator is to coat a conductive carbon layer on the positive electrode side of the separator, and the shuttle of polysulfide cannot be completely prevented.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of modified lithium-sulfur battery diaphragm slurry.
The invention also aims to provide the modified lithium sulfur battery diaphragm slurry obtained by the preparation method, which is doped with monosaccharide or oligosaccharide and coated on a base film to form the modified lithium sulfur battery diaphragm, and can inhibit the shuttle effect of polysulfide and catalyze and accelerate the reaction of converting lithium polysulfide into lithium sulfide.
Another object of the present invention is to provide a lithium sulfur battery employing the modified lithium sulfur battery separator.
The aim of the invention is achieved by the following technical scheme.
The preparation method of the modified lithium-sulfur battery diaphragm slurry comprises the following steps:
uniformly mixing a solvent, a dispersing agent, conductive carbon black, saccharides, a thickening agent and an adhesive to obtain the modified lithium sulfur battery diaphragm slurry, wherein the saccharides are monosaccharides or oligosaccharides, the solvent is a mixture of water and alcohols, the dispersing agent is a mixture of one or more of sodium polyacrylate, potassium polyacrylate, ammonium polyacrylate and sodium polycarboxylate, the conductive carbon black is a mixture of one or more of Super P Li, acetylene black, ketjen black, single-wall carbon nanotubes, multi-wall carbon nanotubes, natural graphite and artificial graphite, the thickening agent is a cellulose thickener, the adhesive is a mixture of one or more of water-based polyacrylate, polyurethane acrylate, polyether acrylate, polyurethane and epoxy resin, and the ratio of water to alcohols is (1-10) in parts by mass: (1-10), wherein the ratio of the solvent, the dispersant, the conductive carbon black, the saccharide, the thickener and the binder is 100: (0.1-10): (0.1-20): (5-10): (0.1-2): (0.1-10).
In the technical scheme, the solvent and the dispersing agent are stirred for 5-30 min at the rotating speed of 300-1500 rpm/min, then the conductive carbon black is added, the mixture is stirred for 30-150 min at the rotating speed of 1000-5500 rpm/min, and then the mixture is sanded for 15-35 min at the rotating speed of 1000-3000 rpm/min, so that the first mixed solution is obtained.
In the technical scheme, the first mixed solution is mixed with sugar, stirred for 5-30 min at the rotating speed of 500-1500 rpm/min, then added with thickener and stirred for 5-30 min at the rotating speed of 300-1500 rpm/min, finally added with adhesive and stirred for 5-30 min at the rotating speed of 300-1500 rpm/min, and the modified lithium-sulfur battery diaphragm slurry is obtained.
In the above technical scheme, the alcohol is a mixture of one or more of ethanol, propanol and isopropanol.
In the above technical scheme, the saccharide is arabinose, ribose, xylose, lyxose, glucose, mannose, fructose, galactose, sucrose or maltose.
In the above technical scheme, the thickener is a mixture of one or more of sodium carboxymethyl cellulose, carboxymethyl hydroxypropyl cellulose and hydroxyethyl cellulose.
The modified lithium sulfur battery diaphragm slurry obtained by the preparation method is prepared.
The method for preparing the modified lithium sulfur battery diaphragm comprises the steps of coating the modified lithium sulfur battery diaphragm slurry on the positive electrode side of a base film, drying and obtaining a coating on the base film, wherein the base film and the coating on the base film are the modified lithium sulfur battery diaphragm.
In the technical scheme, the thickness of the coating is 0.5-10 mu m.
In the above technical solution, the coating mode of the coating is micro gravure coating.
In the technical scheme, the base film is a polyethylene film, and the thickness of the base film is 5-25 mu m.
In the above technical solution, the polyethylene of the polyethylene film is ultra-high molecular weight polyethylene.
A lithium sulfur battery, wherein a diaphragm of the lithium sulfur battery is the modified lithium sulfur battery diaphragm, an active material of an anode of the lithium sulfur battery is elemental sulfur, an active material of a cathode of the lithium sulfur battery is metal lithium, and an electrolyte of the lithium sulfur battery is LiPF 6 、LiBF 4 、LiAsF 6 A mixture of one or more of LiTFSI and LiFSI;
in the above technical solution, the solvent of the electrolyte is a nonaqueous organic solvent capable of dissolving the electrolyte.
In the technical scheme, the solvent of the electrolyte is one or more of ethylene carbonate, propylene carbonate, 1, 2-butylene carbonate, 1, 2-pentylene carbonate, 2, 3-pentylene carbonate, ethylene carbonate, fluoroethylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methylethyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, gamma-butyrolactone, gamma-valerolactone and gamma-caprolactone, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, methyl ethyl ether, methyl propyl ether, ethyl propyl ether, 1, 3-dioxolane and 1, 4-dioxane.
According to the invention, monosaccharide or oligosaccharide is added into the modified lithium-sulfur battery diaphragm to inhibit shuttling of lithium polysulfide in the discharging process of the lithium-sulfur battery, so that the cycle performance of the battery is improved, the service life of the battery is prolonged, and the cycle efficiency is improved.
Drawings
Fig. 1 is an SEM of a modified lithium sulfur battery separator obtained in example 1 of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
The relevant instruments and equipment used in the specific embodiment of the invention are as follows:
a stirrer: double planetary power mixer, guangzhou red traffic mixing equipment limited company;
sand mill: rod pin type nano sand mill, guangzhou Pailer mechanical equipment limited company;
coating machine: a micro gravure coater, hefeidong mechanical technology Co., ltd.
The related medicines used in the specific embodiment of the invention are as follows:
glucose: national pharmaceutical group chemical agents, inc;
sucrose: national pharmaceutical group chemical agents, inc;
galactose: anhui He Biotechnology Co., ltd;
arabinose: anhui He Biotechnology Co., ltd;
dispersing agent: pick chemical Co Ltd;
and (2) an adhesive: pick chemical Co Ltd;
super P Li: conductive carbon black is produced by switzerland termi company;
the model of the lithium sulfur battery is 606090-4000mAh type soft package battery;
the polyethylene of the polyethylene film described below is ultra-high molecular weight polyethylene.
Example 1
The preparation method of the modified lithium-sulfur battery diaphragm slurry comprises the following steps:
mixing a solvent and a dispersing agent by a double-planetary power mixer, stirring at a speed of 1000rpm/min for 10min, adding conductive carbon black, stirring at a speed of 3000rpm/min for 60min, and sanding with a rod pin type nano sand mill at a speed of 1500rpm/min for 20min to obtain a first mixed solution. Mixing the first mixed solution with saccharides by a double-planetary power mixer, stirring at a rotation speed of 500rpm/min for 15min, adding a thickening agent, stirring at a rotation speed of 800rpm/min for 10min, and finally adding an adhesive, and stirring at a rotation speed of 600rpm/min for 8min to obtain the modified lithium-sulfur battery diaphragm slurry. Wherein, the ratio of the solvent, the dispersant, the conductive carbon black, the saccharide, the thickener and the adhesive is 100:0.5:10:6:0.4: 2, the dispersing agent is sodium polyacrylate, the conductive carbon black is Super P Li, the saccharide is glucose, the thickener is sodium carboxymethyl cellulose, the adhesive is polyurethane acrylic ester, the solvent is a mixture of water and ethanol, and the ratio of water to ethanol is 4:1.
a method for preparing a modified lithium sulfur battery diaphragm prepares a polyethylene film with the thickness of 12 mu m, coats modified lithium sulfur battery diaphragm slurry on the positive electrode side of the polyethylene film by a micro gravure coating type coater, and dries the polyethylene film at 80 ℃ for 30 seconds to obtain a coating, wherein the thickness of the coating is 2 mu m, and the polyethylene film and the coating on the polyethylene film are the modified lithium sulfur battery diaphragm.
A lithium sulfur battery, the diaphragm of the lithium sulfur battery is the modified lithium sulfur battery diaphragm,the active material of the positive electrode of the lithium-sulfur battery is elemental sulfur, the active material of the negative electrode of the lithium-sulfur battery is metallic lithium, and the electrolyte of the lithium-sulfur battery is LiPF 6 The solvent of the electrolyte is a mixture of dimethyl carbonate and diethyl carbonate in a volume ratio of 1:1.
An SEM of the modified lithium sulfur battery separator obtained in example 1 is shown in fig. 1.
Example 2
The preparation method of the modified lithium-sulfur battery diaphragm slurry comprises the following steps:
mixing a solvent and a dispersing agent by a double-planetary power mixer, stirring at 600rpm/min for 15min, adding conductive carbon black, stirring at 5000rpm/min for 35min, and sanding with a rod pin type nano sand mill at 2000rpm/min for 20min to obtain a first mixed solution. Mixing the first mixed solution with saccharides by a double-planetary power mixer, stirring at a speed of 1000rpm/min for 10min, adding a thickening agent, stirring at a speed of 1000rpm/min for 8min, and finally adding a binding agent, and stirring at a speed of 500rpm/min for 10min to obtain the modified lithium-sulfur battery diaphragm slurry. Wherein, the ratio of the solvent, the dispersant, the conductive carbon black, the saccharide, the thickener and the adhesive is 100:1:3:6:0.8:3, the dispersing agent is sodium polyacrylate, the conductive carbon black is acetylene black, the saccharide is glucose, the thickener is hydroxyethyl cellulose, the adhesive is polyether acrylate, the solvent is a mixture of water and propanol, and the ratio of water to propanol is 2: 1.
A method for preparing a modified lithium sulfur battery diaphragm prepares a polyethylene film with the thickness of 9 mu m, coats modified lithium sulfur battery diaphragm slurry on the positive electrode side of the polyethylene film by a micro gravure coating type coater, and dries the polyethylene film at 80 ℃ for 30 seconds to obtain a coating, wherein the thickness of the coating is 3.5 mu m, and the polyethylene film and the coating on the polyethylene film are the modified lithium sulfur battery diaphragm.
The lithium sulfur battery comprises a diaphragm of the lithium sulfur battery, an active material of an anode of the lithium sulfur battery is elemental sulfur, an active material of a cathode of the lithium sulfur battery is metallic lithium, an electrolyte of the lithium sulfur battery is LiTFSI, and a solvent of the electrolyte is a mixture of ethylene glycol dimethyl ether and 1, 3-dioxolane in a volume ratio of 1:1.
Example 3
The preparation method of the modified lithium-sulfur battery diaphragm slurry comprises the following steps:
mixing a solvent and a dispersing agent by a double-planetary power mixer, stirring at a rotation speed of 300rpm/min for 15min, adding conductive carbon black, stirring at a rotation speed of 1200rpm/min for 120min, and sanding with a bar pin type nano sand mill at a rotation speed of 3000rpm/min for 15min to obtain a first mixed solution. Mixing the first mixed solution with saccharides by a double-planetary power mixer, stirring at a speed of 850rpm/min for 8min, adding a thickening agent, stirring at a speed of 1000rpm/min for 6min, and finally adding an adhesive, and stirring at a speed of 1500rpm/min for 5min to obtain the modified lithium-sulfur battery diaphragm slurry. Wherein, the ratio of the solvent, the dispersant, the conductive carbon black, the saccharide, the thickener and the adhesive is 100:1:3:8:2:1, a dispersant is potassium polyacrylate, conductive carbon black is ketjen black, sugar is sucrose, a thickener is carboxymethyl hydroxypropyl cellulose, a binder is polyurethane acrylate, a solvent is a mixture of water and ethanol, and the ratio of water to ethanol is 3:1.
a method for preparing a modified lithium sulfur battery diaphragm prepares a polyethylene film with the thickness of 12 mu m, coats modified lithium sulfur battery diaphragm slurry on the positive electrode side of the polyethylene film by a micro gravure coating type coater, and dries the polyethylene film at 80 ℃ for 30 seconds to obtain a coating, wherein the thickness of the coating is 3 mu m, and the polyethylene film and the coating on the polyethylene film are the modified lithium sulfur battery diaphragm.
A lithium sulfur battery, wherein a diaphragm of the lithium sulfur battery is the modified lithium sulfur battery diaphragm, an active material of an anode of the lithium sulfur battery is elemental sulfur, an active material of a cathode of the lithium sulfur battery is metal lithium, and an electrolyte of the lithium sulfur battery is LiPF 6 The solvent of the electrolyte is a mixture of diethyl diethanolate and dimethyl carbonate in a volume ratio of 1:1.
Example 4
The preparation method of the modified lithium-sulfur battery diaphragm slurry comprises the following steps:
mixing a solvent and a dispersing agent by a double-planetary power mixer, stirring at 900rpm/min for 10min, adding conductive carbon black, stirring at 3500rpm/min for 50min, and sanding with a bar pin type nano sand mill at 1800rpm/min for 15min to obtain a first mixed solution. And mixing the first mixed solution with saccharides by using a double-planetary power mixer, stirring at a rotation speed of 500rpm/min for 20min, adding a thickening agent, stirring at a rotation speed of 1200rpm/min for 5min, and finally adding an adhesive, and stirring at a rotation speed of 1000rpm/min for 10min to obtain the modified lithium-sulfur battery diaphragm slurry. Wherein, the ratio of the solvent, the dispersant, the conductive carbon black, the saccharide, the thickener and the adhesive is 100:0.2:0.3:7: 0.1:0.5, wherein the dispersing agent is ammonium polyacrylate, the conductive carbon black is carbon nano tube, the saccharide is galactose, the thickener is sodium carboxymethyl cellulose, the adhesive is water polyacrylate, the solvent is a mixture of water and isopropanol, and the ratio of water to isopropanol is 1 in parts by weight: 2.
a method for preparing a modified lithium sulfur battery diaphragm prepares a polyethylene film with the thickness of 16 mu m, coats modified lithium sulfur battery diaphragm slurry on the positive electrode side of the polyethylene film by a micro gravure coating type coater, and dries the polyethylene film at 80 ℃ for 30 seconds to obtain a coating, wherein the thickness of the coating is 0.5 mu m, and the polyethylene film and the coating on the polyethylene film are the modified lithium sulfur battery diaphragm.
The lithium sulfur battery comprises a diaphragm of the lithium sulfur battery, an active material of an anode of the lithium sulfur battery is elemental sulfur, an active material of a cathode of the lithium sulfur battery is metallic lithium, an electrolyte of the lithium sulfur battery is LiTFSI, and a solvent of the electrolyte is a mixture of methyl ethyl carbonate and 1, 3-dioxolane in a volume ratio of 1:1.
Example 5
The preparation method of the modified lithium-sulfur battery diaphragm slurry comprises the following steps:
mixing a solvent and a dispersing agent by a double-planetary power mixer, stirring at a rotating speed of 1500rpm/min for 5min, adding conductive carbon black, stirring at a rotating speed of 4000rpm/min for 45min, and sanding with a bar pin type nano sand mill at a rotating speed of 1000rpm/min for 30min to obtain a first mixed solution. Mixing the first mixed solution with saccharides by a double-planetary power mixer, stirring at a rotation speed of 550rpm/min for 12min, adding a thickening agent, stirring at a rotation speed of 1000rpm/min for 10min, and finally adding an adhesive, and stirring at a rotation speed of 1000rpm/min for 10min to obtain the modified lithium-sulfur battery diaphragm slurry. Wherein, the ratio of the solvent, the dispersant, the conductive carbon black, the saccharide, the thickener and the adhesive is 100:0.8:15:5:1: 3, the dispersing agent is ammonium polyacrylate, the conductive carbon black is Super P Li, the saccharide is rhamnose, the thickener is sodium carboxymethyl cellulose, the adhesive is polyurethane acrylic ester, the solvent is a mixture of water and isopropanol, and the ratio of water to isopropanol is 1 in parts by weight: 1.
a method for preparing a modified lithium sulfur battery diaphragm prepares a polyethylene film with the thickness of 7 mu m, coats modified lithium sulfur battery diaphragm slurry on the positive electrode side of the polyethylene film by a micro gravure coating type coater, and dries the polyethylene film at 80 ℃ for 30 seconds to obtain a coating, wherein the thickness of the coating is 5 mu m, and the polyethylene film and the coating on the polyethylene film are the modified lithium sulfur battery diaphragm.
The lithium sulfur battery comprises a diaphragm of the lithium sulfur battery, an active material of an anode of the lithium sulfur battery is elemental sulfur, an active material of a cathode of the lithium sulfur battery is metallic lithium, an electrolyte of the lithium sulfur battery is LiTFSI, and a solvent of the electrolyte is a mixture of diethyl carbonate, ethylene glycol dimethyl ether and 1, 3-dioxolane in a volume ratio of 1:1:1.
Comparative example 1
The preparation method of the lithium-sulfur battery diaphragm slurry comprises the following steps:
stirring a solvent and a dispersing agent for 10min at a rotating speed of 1000rpm/min by using a double-planetary power mixer, adding conductive carbon black, stirring for 60min at a rotating speed of 3000rpm/min, and sanding for 20min at a rotating speed of 1500rpm/min by using a bar pin type nano sand mill to obtain a first mixed solution. And stirring the first mixed solution and the thickener for 10min at the rotation speed of 800rpm/min by using a double-planetary power mixer, and finally adding the adhesive and stirring for 8min at the rotation speed of 600rpm/min to obtain the lithium-sulfur battery diaphragm slurry. Wherein, the ratio of the solvent, the dispersant, the conductive carbon black, the thickener and the adhesive is 100:0.5:10:0.4:2, the dispersing agent is sodium polyacrylate, the conductive carbon black is Super P Li, the thickener is sodium carboxymethyl cellulose, the adhesive is polyurethane acrylic ester, the solvent is a mixture of water and ethanol, and the ratio of water to ethanol is 4:1.
a method for preparing a lithium sulfur battery diaphragm prepares a polyethylene film with the thickness of 12 mu m, coats lithium sulfur battery diaphragm slurry on the positive electrode side of the polyethylene film by using a micro gravure coating type coater, dries for 30 seconds at 80 ℃ and then obtains a coating on the polyethylene film, wherein the thickness of the coating is 2 mu m, and the polyethylene film and the coating on the polyethylene film are the lithium sulfur battery diaphragm.
A lithium sulfur battery, wherein a diaphragm of the lithium sulfur battery is a lithium sulfur battery diaphragm, an active material of an anode of the lithium sulfur battery is elemental sulfur, an active material of a cathode of the lithium sulfur battery is metallic lithium, and an electrolyte of the lithium sulfur battery is LiPF 6 The solvent of the electrolyte is a mixture of dimethyl carbonate and diethyl carbonate in a volume ratio of 1:1.
The modified lithium sulfur battery separator prepared in the example and the lithium sulfur battery separator prepared in the comparative example were tested, and the test results are shown in table 1.
TABLE 1
The lithium sulfur battery was subjected to the following performance test, and the test results are shown in table 2.
TABLE 2
| Examples/comparative examples | Cycle performance (200 cycles) (%) of 0.5C-rate battery | Time to failure of battery (h) |
| Example 1 | 93.11 | 805 |
| Example 2 | 94.33 | 789 |
| Example 3 | 95.02 | 824 |
| Example 4 | 89.13 | 786 |
| Example 5 | 91.21 | 802 |
| Comparative example 1 | 48.62 | 212 |
As can be seen from the data in table 1, the modified lithium sulfur battery separator and the lithium sulfur battery separator have no significant difference in the needling strength, the breakdown voltage, and the thermal shrinkage rate of the separator compared with the comparative example, which indicates that the mechanical properties of the separator itself are not reduced when the modified lithium sulfur battery separator slurry is coated with the monosaccharide or oligosaccharide doped on the base film.
As can be seen from the data in table 2, in the examples, compared with the comparative examples, the battery cycle performance of the lithium-sulfur battery using the modified lithium-sulfur battery separator is significantly improved, the cycle capacity retention rate is significantly improved, the battery operating time is greatly prolonged, and the battery service life is effectively prolonged.
There are 5 hydroxyl groups in a single glucose molecule, each of which is capable of combining with lithium in lithium polysulfide to form a lithium-oxygen bond. Glucose and Li according to Density Functional Theory (DFT) calculations 2 S 4 、Li 2 S 6 、Li 2 S 8 The binding energies of (a) are 0.90eV, 0.95eV, 0.92eV, respectively, which are much higher than 0.58-0.61eV of polyvinylidene fluoride (PVDF). The high binding energy enables glucose to capture lithium polysulfide dissolved out from the positive electrode in the discharging process of the battery, and the lithium polysulfide continuously participates in oxidation reaction through the conductive coating coated on the modified lithium sulfur battery diaphragm, so that Li insoluble in electrolyte is finally generated 2 S, the positive electrode capacity loss is reduced, the battery cycle capacity retention rate is improved, the service life of the battery is prolonged, and the working principle of the rest polyhydroxy monosaccharides and oligosaccharides is the same as that of glucose.
The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.
Claims (9)
1. The preparation method of the modified lithium-sulfur battery diaphragm slurry is characterized by comprising the following steps of:
uniformly mixing a solvent, a dispersing agent, conductive carbon black, saccharides, a thickening agent and an adhesive to obtain the modified lithium sulfur battery diaphragm slurry, wherein the solvent is a mixture of water and alcohols, the dispersing agent is a mixture of one or more of sodium polyacrylate, potassium polyacrylate, ammonium polyacrylate and sodium polycarboxylate, the conductive carbon black is ketjen black, the thickening agent is a cellulose thickening agent, the adhesive is a mixture of one or more of water-based polyacrylate, polyurethane acrylate, polyether acrylate, polyurethane and epoxy resin, and the ratio of water to alcohols is (1-10) in parts by weight: (1-10), wherein the ratio of the solvent, the dispersant, the conductive carbon black, the saccharide, the thickener and the binder is 100: (0.1-10): (0.1-20): (5-10): (0.1-2): (0.1-10);
the alcohol is one or a mixture of more of ethanol, propanol and isopropanol; the saccharide is sucrose; the thickener is one or more of sodium carboxymethyl cellulose, carboxymethyl hydroxypropyl cellulose and hydroxyethyl cellulose.
2. The preparation method according to claim 1, wherein the solvent and the dispersant are stirred at a rotation speed of 300-1500 rpm for 5-30 min, then the conductive carbon black is added, stirred at a rotation speed of 1000-5500 rpm for 30-150 min, and then sanded at a rotation speed of 1000-3000 rpm for 15-35 min to obtain the first mixed solution.
3. The preparation method according to claim 2, wherein the first mixed solution is mixed with sugar, stirred at a rotation speed of 500-1500 rpm for 5-30 min, then added with thickener and stirred at a rotation speed of 300-1500 rpm for 5-30 min, and finally added with adhesive and stirred at a rotation speed of 300-1500 rpm for 5-30 min, thereby obtaining the modified lithium sulfur battery diaphragm slurry.
4. A modified lithium sulfur battery separator slurry obtained by the production process according to any one of claims 1 to 3.
5. A method for preparing a modified lithium sulfur battery diaphragm, which is characterized in that the modified lithium sulfur battery diaphragm slurry in claim 4 is coated on the positive electrode side of a base film, and a coating is obtained on the base film after drying, wherein the base film and the coating positioned on the base film are the modified lithium sulfur battery diaphragm.
6. The method of claim 5, wherein the coating has a thickness of 0.5 to 10 μm; the coating mode of the coating is micro gravure coating; the base film is a polyethylene film, and the thickness of the base film is 5-25 mu m; the polyethylene of the polyethylene film is ultra-high molecular weight polyethylene.
7. A lithium sulfur battery is characterized in that a diaphragm of the lithium sulfur battery is a modified lithium sulfur battery diaphragm obtained by the method of claim 5, an active material of an anode of the lithium sulfur battery is elemental sulfur, an active material of a cathode of the lithium sulfur battery is metallic lithium, and an electrolyte of the lithium sulfur battery is LiPF 6 、LiBF 4 、LiAsF 6 A mixture of one or more of LiTFSI and LiFSI.
8. The lithium sulfur battery of claim 7 wherein the solvent of the electrolyte is a non-aqueous organic solvent capable of dissolving the electrolyte.
9. The lithium sulfur battery of claim 7 wherein the solvent of the electrolyte is a mixture of one or more of ethylene carbonate, propylene carbonate, 1, 2-butylene carbonate, 1, 2-pentylene carbonate, 2, 3-pentylene carbonate, vinylene carbonate, ethylene carbonate, fluoroethylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methyl ethyl carbonate, methyl propyl carbonate, ethylene propyl carbonate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, gamma-butyrolactone, gamma-valerolactone and gamma-caprolactone, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, methyl ethyl ether, methyl propyl ether, ethyl propyl ether, 1, 3-dioxolane, and 1, 4-dioxane.
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