CN111785892B - Preparation method of lithium-sulfur battery composite diaphragm - Google Patents
Preparation method of lithium-sulfur battery composite diaphragm Download PDFInfo
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- CN111785892B CN111785892B CN201910265141.9A CN201910265141A CN111785892B CN 111785892 B CN111785892 B CN 111785892B CN 201910265141 A CN201910265141 A CN 201910265141A CN 111785892 B CN111785892 B CN 111785892B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
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- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/342—Preparation characterised by non-gaseous activating agents
- C01B32/348—Metallic compounds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a preparation method of a lithium-sulfur battery composite diaphragm, which comprises the following steps: (1) sequentially carrying out soaking, washing, drying, mechanical treatment, carbonization, activation, secondary washing and final drying on the areca residue to obtain porous carbon; (2) mixing porous carbon, a binder and an organic solvent to prepare a membrane casting solution, and coating the membrane casting solution on a base membrane to prepare a composite membrane; (3) and (3) preparing the lithium-sulfur battery by using the composite membrane prepared in the step (2). The invention successfully prepares porous carbon with large specific surface area and large pore volume by using the waste betel nut residues, and uses the porous carbon in the modified coating of the lithium-sulfur battery diaphragm, thereby preparing the lithium-sulfur battery composite diaphragm with excellent performance and the lithium-sulfur battery using the composite diaphragm.
Description
Technical Field
The invention relates to a preparation method of a composite diaphragm of a lithium-sulfur battery, belonging to the technical field of lithium-sulfur batteries.
Background
The lithium-sulfur battery has the advantages of abundant resources, low cost, high theoretical specific capacity of 1675 mAh/g, high energy density of 2600 Wh/kg and the like. As an important component of the lithium-sulfur battery, the electrolyte not only controls the dynamic process of ion transmission in the battery, but also fundamentally determines the working mechanism of the battery, and influences the specific energy, rate, cycle life, safety performance, production cost and the like of the battery. The organic liquid electrolyte is easy to volatilize, inflammable and explosive, and is the root cause of poor safety performance of the lithium metal secondary battery; at the same time, the problems of polysulfide dissolution shuttling and lithium metal dendrites have not been properly solved.
Meanwhile, the stability of the performance of the lithium-sulfur battery separator directly affects the performance of the battery. At present, commercial lithium-sulfur battery diaphragms made of polyolefin materials still have more defects, the local temperature of the battery rises rapidly in the high-power discharge process, when the temperature is close to the melting starting point of the diaphragm, the positive and negative pole pieces can be contacted by thermal contraction, and the instant heat generation is a huge potential danger; the polyolefin diaphragm has hydrophobicity, and the wettability of the diaphragm to electrolyte is poor; the diaphragm is stably positioned between the positive electrode and the negative electrode in the long-term charge and discharge process of the battery, and tiny poor contact can cause the increase of internal resistance and the puncture of the diaphragm. The surface of the lithium-sulfur battery diaphragm is coated, so that the performance of the diaphragm, particularly the dimensional stability at high temperature and the wettability to electrolyte, can be simply and conveniently improved. The performance of the diaphragm can be greatly improved, the safety of the battery can be improved, and the performance of the battery can be improved by coating inorganic and organic coatings. The application of porous functional coatings with high conductivity on the existing commercial separator is an effective method for modifying the separator.
Every year, a large amount of areca nuts are consumed in the areas of Hunan and Hainan, and accordingly, a large amount of areca nut residues are generated, which causes great damage to the environment. The areca residue is a biological material rich in carbon and nitrogen, and a loose and porous nitrogen-doped carbon material with large specific surface area is obtained through carbonization and activation for the first time. The carbon material is firstly circulated to effectively trap polysulfide penetrating through the separator and remarkably improve the electric conduction and lithium conduction capability of the separator.
Disclosure of Invention
The invention aims to provide a method for manufacturing a composite diaphragm of a lithium-sulfur battery. The porous nitrogen-doped porous carbon with large specific surface area is prepared by taking areca residue as a carbon source and is coated on a base film as a functional coating.
The invention is realized by the following technical scheme:
the invention provides a method for manufacturing a composite diaphragm of a lithium-sulfur battery, which comprises the following steps:
1. a preparation method of a lithium-sulfur battery composite diaphragm is characterized by comprising the following steps:
step one, taking betel nut residues, soaking the betel nut residues in deionized water for 1-5 days, then washing the betel nut residues with the deionized water for 3-6 times, and then drying the betel nut residues in an oven at the temperature of 80-160 ℃ for 12-24 hours;
step two, mechanically treating the dried areca residue obtained in the step one to obtain easily carbonized areca residue;
step three, putting the easy-carbonized areca-nut residues obtained in the step two into a tubular electric furnace, introducing protective gas, heating to 400-;
step four, grinding the carbonized areca-nut residues obtained in the step three and an activating agent into powder in a mortar according to the mass ratio of 1:0.25-4, putting the powder into a tubular electric furnace, introducing protective gas, heating to 900 ℃ at the heating rate of 1-10 ℃/min, and carrying out heat preservation and calcination for 1-4 h to obtain activated areca-nut residues;
step five, washing the activated areca residue obtained in the step four in an acid solution for 3-5 times, then continuing to wash in deionized water for 2-4 times, and then drying in an oven at 60-130 ℃ for 24-48 h to obtain porous carbon;
step six, mixing an organic solvent, a high molecular organic substance and the porous carbon obtained in the step five according to a mass ratio of 5-20: 1: 0.05-0.3, heating and stirring for 12-36 h in an oil bath pan at 50-140 ℃, and standing for 6-24 h in an oven at 50-100 ℃ to obtain a casting solution;
step seven, coating the casting solution obtained in the step six on a base film, soaking the base film coated with the casting solution in a mixed coagulating bath for 6-48 h, and then drying in an oven at 50-120 ℃ for 12-48 h to obtain the lithium-sulfur battery composite diaphragm;
and step eight, sequentially packaging the positive electrode of the lithium-sulfur battery, the composite diaphragm of the lithium-sulfur battery obtained in the step seven, the electrolyte and the negative electrode of the metal lithium sheet in an anhydrous and oxygen-free environment to obtain the lithium-sulfur battery.
Preferably, the mechanical treatment in the second step is one or more of ball milling, shearing and extrusion.
Preferably, the easily carbonized areca residue obtained in the second step is one of filiform, strip, granular or powdery.
Preferably, the protective gas in step three and step four is one of argon, nitrogen or helium.
Preferably, the activating agent in the fourth step is KOH, KCl, FeCl3、Fe2O3Or ZnCl2One kind of (1).
Preferably, the acid solution in the fifth step is one of sulfuric acid, hydrochloric acid or nitric acid.
Preferably, in the sixth step, the polymer organic substance is one or more of PVDF, PTFE, PEI, PVDF-HFP, and HDPE, and the organic solvent is one of DMF, DMAC, NMP, and DMSO.
Preferably, the base membrane in the seventh step is one of a PP membrane, a PE membrane, a PEI membrane, a PVDF membrane, and a PVDF-HFP membrane, and the mixed coagulation bath is a blended solution obtained by blending an organic solvent and deionized water in a mass ratio of 0-5:1, wherein the organic solvent is the same as the organic solvent selected in the sixth step.
Preferably, the coating mode in the seventh step is one of spraying, brushing and blade coating, and the coating thickness is 10-20 μm.
Preferably, the positive electrode of the lithium-sulfur battery in the step eight is prepared by coating a blend of pure sulfur powder, a conductive material, a binder and NMP on an aluminum foil, wherein the blending mass ratio of the pure sulfur powder, the conductive material, the binder and the NMP is 2-8: 1: 0.1-0.3: 4-20, the conductive material is one of Super P, acetylene black and Ketjen black, and the binder is one of PVDF, PTFE and PVA; the electrolyte consists of lithium salt and solvent, wherein the lithium salt is selected from LiClO4、LiTFSI、LiNO3、LiFSI、LiCF3SO3、LiPF6The solvent is one or more selected from dimethyl sulfoxide, ethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1-ethyl-3-methyl tetrafluoroborate imidazole and N, N-dimethylformamide.
The innovation points of the invention are as follows:
the waste betel nut residues are used as a carbon source to prepare porous carbon with large specific surface area and large pore volume, and further the lithium-sulfur battery composite diaphragm is modified to prepare the lithium-sulfur battery with excellent performance.
Compared with the prior art, the invention has a plurality of beneficial effects.
1. The porous carbon is prepared by taking the areca residue as a carbon source and is applied to the preparation of the lithium-sulfur battery composite diaphragm. The betel nut dregs are common wastes in Hunan and Hainan areas, and cause serious damage to the environment. The use of betel nut dregs as a carbon source is an action of changing waste into valuable and is beneficial to environmental protection.
2. The porous carbon prepared from the areca residue is loose and porous, has large specific surface area, large pore volume and good electrochemical performance, is prepared into a coating to be coated on a diaphragm, and is favorable for improving the cycle performance and the discharge specific capacity of the lithium-sulfur battery.
The present invention will be described in further detail with reference to the following embodiments, which are illustrative only and not limiting, and the scope of the present invention is not limited thereby.
Description of the drawings:
fig. 1 is a scanning electron microscope image of porous carbon prepared from betel nut residues for a lithium-sulfur battery composite separator coating.
Example 1: selecting 30 g of areca residue, firstly soaking in deionized water for 2 days, then washing in deionized water for 3 times, drying in a 100 ℃ oven for 12 hours, then cutting the areca residue into filaments with the diameter of about 3 mm, putting the filaments into a tubular electric furnace in an argon environment, and starting to heat up. The temperature rise speed is 2 ℃/min, the temperature is raised to 500 ℃, and the carbonized material is taken out after heat preservation and calcination are carried out for 3 h. 10 g of carbonized material was ground to a powder by blending with 30 g of KOH. And (3) placing the ground blended powder into a nitrogen environment tubular electric furnace, continuously heating up to 600 ℃ at the heating rate of 3 ℃/min, carrying out heat preservation and calcination for 4 h, and taking out the activated material. And (3) washing the activated material with hydrochloric acid and deionized water respectively for 3 times, and drying in an oven at 120 ℃ for 24 hours to obtain the dried porous carbon.
0.4 g of porous carbon, 2 g of PVDF granules, are dissolved in 25 g of DMAC and heated with stirring in an oil bath at 75 ℃ for 12 h. Standing in an oven at 80 ℃ for 12 h to obtain the required membrane casting solution, and coating the obtained membrane casting solution on a PE membrane by a scraper with the thickness of 10 mu m. The coated PE film was soaked in a 25% mass fraction aqueous DMAC solution for 24 h and then dried in an 80 ℃ oven for 24 h. The finally obtained separator was die-cut into circular sheets with a diameter of 19 mm for use.
1.4 g of pure sulfur powder, 0.4 g of Super P, 0.1 g of PVDF and 10 g of NMP are mixed and ground to obtain slurry, and the slurry is coated on an aluminum foil with the diameter of 15mm by using a painting brush to obtain the positive cellThe coating amount was 1.0 mg cm-2. And dissolving 0.5M LiTFSI in tetraethylene glycol dimethyl ether in a glove box in an argon environment to prepare a required electrolyte, and sequentially packaging the battery anode, the obtained circular membrane, the electrolyte and a lithium sheet to obtain the lithium-sulfur battery.
The carbon material prepared in this example had a specific surface area of 1245 m2 g-1Pore volume of 0.57 cm3 g-1. The lithium sulfur battery prepared in this example and the lithium sulfur battery using the PE separator were subjected to charge and discharge tests at a voltage ranging from 1.5 to 3V. The first-coil specific discharge capacity of the lithium-sulfur battery prepared in the embodiment is 1273 mA h g at 0.2C-1The first-circle specific discharge capacity of the lithium-sulfur battery using the PE diaphragm is 1073 mA h g-1(ii) a After 300 cycles, the capacity retention rate of the lithium-sulfur battery prepared by the embodiment reaches 87%, and only 0.043% is lost per cycle, while the capacity retention rate of the lithium-sulfur battery using the PE diaphragm is only 68%, and 0.107% is lost per cycle.
Example 2: selecting 30 g of areca residue, firstly soaking in deionized water for 2 days, then washing in deionized water for 4 times, drying in an oven at 100 ℃ for 20 hours, then ball-milling the areca residue into thin strips with the diameter of about 3 mm, putting the strips into a tubular electric furnace in a nitrogen environment, and starting to heat up. The temperature rise speed is 5 ℃/min, the temperature is raised to 500 ℃, and the carbonized material is taken out after heat preservation and calcination are carried out for 3 h. 10 g of the carbonized material was blended with 20 g of KCl and ground into powder. And (3) placing the ground blended powder into a helium environment tubular electric furnace, continuing heating up at the heating rate of 5 ℃/min to 800 ℃, keeping the temperature, calcining for 3 h, and taking out the activated material. And (3) washing the activated material with nitric acid and deionized water respectively for 3 times, and drying in an oven at 100 ℃ for 36 hours to obtain the dried porous carbon.
0.5 g of porous carbon, 2.5 g of PTFE particles were dissolved in 20 g of DMF and heated with stirring in an oil bath at 80 ℃ for 12 h. Standing in an oven at 80 ℃ for 12 h to obtain the required membrane casting solution, and blade-coating the obtained membrane casting solution on a PVDF-HFP membrane by using a scraper, wherein the blade-coating thickness is 15 mu m. The coated PVDF-HFP diaphragm is soaked in DMF water solution with the mass fraction of 50% for 24 hours and then dried in an oven at 80 ℃ for 24 hours. The finally obtained separator was die-cut into circular sheets with a diameter of 19 mm for use.
1.5 g of pure sulfur powder, 0.7 g of acetylene black, 0.2 g of PVA and 10 g of NMP are mixed and ground to obtain slurry, the slurry is coated on an aluminum foil with the diameter of 14 mm by a painting brush to prepare the battery anode, and the coating amount is 1.2 mg cm-2. In a glove box under argon atmosphere, 0.5M LiTFSI and 0.5M LiClO were mixed4Dissolving the electrolyte in dimethyl sulfoxide to prepare the required electrolyte, and sequentially packaging the battery anode, the obtained circular diaphragm, the electrolyte and the lithium sheet to obtain the lithium-sulfur battery.
The carbon material prepared in this example had a specific surface area of 1623 m2 g-1Pore volume of 0.79 cm3 g-1. The lithium sulfur battery prepared in this example and the lithium sulfur battery using the general PVDF-HFP separator were subjected to charge and discharge tests at a voltage range of 1.5 to 3V. The first-circle specific discharge capacity of the lithium-sulfur battery prepared in the embodiment is 1365 mA h g at 0.2C-1The first-circle specific discharge capacity of the lithium-sulfur battery using the common PVDF-HFP diaphragm is 1056mA h g-1(ii) a After 300 cycles, the capacity retention rate of the lithium-sulfur battery prepared by the embodiment reaches 85%, and only 0.05% is lost per cycle, while the capacity retention rate of the lithium-sulfur battery using the common PVDF-HFP diaphragm is only 70%, and 0.1% is lost per cycle.
Example 3: selecting 30 g of areca residue, firstly soaking in deionized water for 3 days, then washing in deionized water for 5 times, drying in an oven at 100 ℃ for 24 hours, then extruding the areca residue into filaments with the diameter of about 3 mm, putting the filaments into a tubular electric furnace in a helium environment, and starting to heat up. The temperature rise speed is 5 ℃/min, the temperature is raised to 500 ℃, and the carbonized material is taken out after heat preservation and calcination are carried out for 3 h. 10 g of the carbonized material was mixed with 30 g of FeCl3Blending and grinding into powder. And (3) placing the ground blended powder into an argon environment tubular electric furnace, continuously heating up to 900 ℃ at the heating rate of 4 ℃/min, carrying out heat preservation and calcination for 5 h, and taking out the activated material. And (3) washing the activated material with sulfuric acid and deionized water respectively for 4 times, and drying in an oven at 100 ℃ for 48 hours to obtain the dried porous carbon.
0.6 g of porous carbon, 3 g of HDPE particles were dissolved in 30 g of DMSO and heated with stirring in an oil bath at 80 ℃ for 18 h. Standing in an oven at 80 ℃ for 12 h to obtain the required membrane casting solution, and coating the obtained membrane casting solution on a PP membrane by a scraper with the thickness of 15 mu m. The coated PP separator was soaked in a 70% mass fraction aqueous DMAC solution for 18 h and then dried in a 90 ℃ oven for 36 h. The finally obtained separator was die-cut into circular sheets with a diameter of 19 mm for use.
1.6 g of pure sulfur powder, 0.5 g of Ketjen black, 0.1 g of PTFE and 20 g of NMP are mixed and ground to obtain slurry, and the slurry is coated on an aluminum foil with the diameter of 15mm by a painting brush to obtain a battery anode, wherein the coating amount is 1.5 mg cm-2. And (3) dissolving 0.1M LiTFSI in 1-ethyl-3-methyl tetrafluoroborate imidazole in a glove box in an argon environment to prepare a required electrolyte, and sequentially packaging the battery anode, the obtained circular membrane, the electrolyte and a lithium sheet to obtain the lithium-sulfur battery.
The carbon material prepared in this example had a specific surface area of 1843 m2 g-1Pore volume of 0.72 cm3 g-1. The lithium sulfur battery prepared in this example and the lithium sulfur battery using the PP separator were subjected to charge and discharge tests at a voltage ranging from 1.5 to 3V. The first-coil specific discharge capacity of the lithium-sulfur battery prepared in the embodiment at 0.2C is 1265 mA h g-1The first-ring specific discharge capacity of the lithium-sulfur battery using the common PP diaphragm is 1045 mA h g-1(ii) a After 300 cycles, the capacity retention rate of the lithium-sulfur battery prepared in the embodiment reaches 89%, and only 0.037% is lost per cycle, while the capacity retention rate of the lithium-sulfur battery using the common PP diaphragm is only 65%, and 0.117% is lost per cycle.
Claims (10)
1. A preparation method of a lithium-sulfur battery composite diaphragm is characterized by comprising the following steps:
step one, taking betel nut residues, soaking the betel nut residues in deionized water for 1-5 days, then washing the betel nut residues with the deionized water for 3-6 times, and then drying the betel nut residues in an oven at the temperature of 80-160 ℃ for 12-24 hours;
step two, mechanically treating the dried areca residue obtained in the step one to obtain easily carbonized areca residue;
step three, putting the easy-carbonized areca-nut residues obtained in the step two into a tubular electric furnace, introducing protective gas, heating to 400-;
step four, grinding the carbonized areca-nut residues obtained in the step three and an activating agent into powder in a mortar according to the mass ratio of 1:0.25-4, putting the powder into a tubular electric furnace, introducing protective gas, heating to 900 ℃ at the heating rate of 1-10 ℃/min, and carrying out heat preservation and calcination for 1-4 h to obtain activated areca-nut residues;
step five, washing the activated areca residue obtained in the step four in an acid solution for 3-5 times, then continuing to wash in deionized water for 2-4 times, and then drying in an oven at 60-130 ℃ for 24-48 h to obtain porous carbon;
step six, mixing an organic solvent, a high molecular organic substance and the porous carbon obtained in the step five according to a mass ratio of 5-20: 1: 0.05-0.3, heating and stirring for 12-36 h in an oil bath pan at 50-140 ℃, and standing for 6-24 h in an oven at 50-100 ℃ to obtain a casting solution;
step seven, coating the casting solution obtained in the step six on a base film, soaking the base film coated with the casting solution in a mixed coagulating bath for 6-48 h, and then drying in an oven at 50-120 ℃ for 12-48 h to obtain the lithium-sulfur battery composite diaphragm;
and step eight, sequentially packaging the positive electrode of the lithium-sulfur battery, the composite diaphragm of the lithium-sulfur battery obtained in the step seven, the electrolyte and the negative electrode of the metal lithium sheet in an anhydrous and oxygen-free environment to obtain the lithium-sulfur battery.
2. The method of claim 1, wherein the mechanical treatment in step two is one or more of ball milling, shearing, and extrusion.
3. The method according to claim 1, wherein the easily carbonized betel nut residue obtained in the second step is one of thread-like, strip-like, granular or powder-like.
4. The method of claim 1, wherein the protective gas in step three or step four is one of argon, nitrogen or helium.
5. The method of claim 1, wherein the activator is KOH, KCl, FeCl3、Fe2O3Or ZnCl2One kind of (1).
6. The method of claim 1, wherein in step five the acid solution is one of sulfuric acid, hydrochloric acid or nitric acid.
7. The method according to claim 1, wherein the polymer organic substance in the sixth step is one or more of PVDF, PTFE, PEI, PVDF-HFP and HDPE, and the organic solvent is one of DMF, DMAC, NMP and DMSO.
8. The method according to claim 1, wherein the base film in the seventh step is one of a PP film, a PE film, a PEI film, a PVDF film, and a PVDF-HFP film, and the mixed coagulation bath is a blended solution of an organic solvent and deionized water in a mass ratio of 0-5:1, wherein the organic solvent is the same as the organic solvent selected in the sixth step.
9. The method of claim 1, wherein the coating in step seven is one of spraying, brushing and knife coating, and the coating thickness is 10-20 μm.
10. The method according to claim 1, wherein the positive electrode of the lithium-sulfur battery in step eight is prepared by mixing pure sulfur powder,The blend of the conductive material, the binder and NMP is coated on the aluminum foil, and the blending mass ratio of the pure sulfur powder, the conductive material, the binder and the NMP is 2-8: 1: 0.1-0.3: 4-20, the conductive material is one of Super P, acetylene black and Ketjen black, and the binder is one of PVDF, PTFE and PVA; the electrolyte consists of lithium salt and solvent, wherein the lithium salt is selected from LiClO4、LiTFSI、LiNO3、LiFSI、LiCF3SO3、LiPF6The solvent is one or more selected from dimethyl sulfoxide, ethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1-ethyl-3-methyl tetrafluoroborate imidazole and N, N-dimethylformamide.
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|---|---|
| CN111785892A (en) | 2020-10-16 |
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