CN111244370A - Polyamine carbon composite material, slurry, diaphragm, lithium-sulfur battery and preparation method - Google Patents
Polyamine carbon composite material, slurry, diaphragm, lithium-sulfur battery and preparation method Download PDFInfo
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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Abstract
The invention relates to the technical field of batteries, in particular to a polyamine carbon composite material, slurry, a diaphragm, a lithium-sulfur battery and a preparation method thereof. The polyamine carbon composite material comprises a carboxylated carbon-based material serving as a substrate and polyamine serving as an outer surface layer, wherein the polyamine is uniformly and flatly coated on the outer side surface and/or the inner pore surface of the carboxylated carbon-based material. The material is rich in amino groups, uniform and stable, can be used in lithium-sulfur batteries, and can effectively adsorb lithium polysulfide in a long-cycle process. The invention also provides a preparation method of the material. Furthermore, the invention also discloses slurry and a diaphragm comprising the material, wherein one side of the diaphragm contains a coating layer formed by removing the solvent from the slurry, or a coating layer formed by a polyamine carbon composite material.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a polyamine carbon composite material, slurry, a diaphragm, a lithium-sulfur battery and a preparation method thereof.
Background
The theoretical specific capacity of the lithium-sulfur battery is up to 1675mAh/g, the theoretical energy density is up to 2600Wh/kg, and the theoretical energy density is far higher than that of the lithium-ion battery commonly used at present. In addition, the anode material has rich sulfur reserve, low cost and environmental protection, and is an ideal novel electrode material. However, the development of lithium-sulfur batteries is also limited, and among them, the main problems affecting the cycle performance of lithium-sulfur batteries are: during the charging and discharging process, the intermediate product lithium polysulfide in the lithium-sulfur battery can migrate from the positive electrode to the negative electrode to generate a shuttle effect, so that the performance of the negative electrode is deteriorated, the sulfur of the active material of the positive electrode is reduced, and irreversible capacity loss is caused.
In view of the above problems, studies have been made to suppress the "shuttle effect" by supporting a material containing some heteroatoms such as oxygen, nitrogen, and sulfur on the separator to adsorb lithium polysulfide and restrict its movement. In the traditional technology, the doping materials mostly use oxides, sulfides and the like, the content of heteroatoms in the doping materials is low, and the adsorption effect on lithium polysulfide is not strong. Moreover, the inorganic substance has poor film-forming property, and if the doping material is compounded with the organic polymer diaphragm, the doping material is easy to disperse and fall off. In addition, after the doping material adsorbs lithium polysulfide, if the adsorbed lithium polysulfide is not allowed to continue to participate in discharge, the loss of the active material is also caused.
Disclosure of Invention
In view of the above problems, there is a need to provide a polyamine-carbon composite material which can effectively adsorb lithium polysulfide, has a strong film-forming property, is firmly bonded to a body, is not easy to fall off, and has a good electrical conductivity, and a slurry, a diaphragm, a lithium-sulfur battery and a preparation method thereof.
In order to solve the problems, the invention provides a polyamine carbon composite material. The polyamine-carbon composite material comprises a carboxylated carbon-based material serving as a substrate and polyamine serving as a surface layer, wherein the polyamine is uniformly and flatly coated on the outer side surface and/or the inner pore surface of the carboxylated carbon-based material.
In one embodiment, the carboxylated carbon-based material is selected from at least one of carboxylated graphene oxide, carboxylated carbon nanotubes, carboxylated graphite powder, carboxylated nanocarbon spheres, carboxylated nanocarbon rods, and carboxylated carbon fibers.
In one embodiment, the polyamine is selected from at least one of ethylenediamine, propylenediamine, hexamethylenediamine, p-phenylenediamine, m-phenylenediamine, polyethyleneimine derivatives, chitosan derivatives, dopamine, 2,3,6,7,10, 11-hexaamino-triphenylhexahydrochloride, and triphenylene-2, 3,6,7,10, 11-hexaamine hexahydrochloride.
The invention also provides a preparation method of the polyamine-carbon composite material, which comprises the following steps:
1) mixing the water solution of polyamine with the dispersion liquid containing the carboxylated carbon-based material to obtain a mixed liquid;
2) and (3) carrying out solid-liquid separation on the mixed solution, and drying the solid material in the mixed solution to obtain the polyamine-carbon composite material.
In one embodiment, the pH value of the mixed solution in the step 1) is 5-9. Optionally, the pH value is 6-8.
In one embodiment, the concentration of the polyamine in the aqueous solution of the polyamine in the step 1) is 0.5 g/L-1.5 g/L. Optionally, the concentration of polyamine is 0.8g/L to 1.2 g/L.
In one embodiment, the drying manner in step 2) is air drying, vacuum drying or freeze drying.
The invention also provides a slurry, which comprises a binder, a conductive agent, a solvent and the polyamine carbon composite material according to any one of the embodiments, wherein the binder, the conductive agent, the solvent and the polyamine carbon composite material are mixed to form a slurry mixture.
In one embodiment, the binder is selected from at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, sodium alginate, sodium carboxymethylcellulose, hydroxypropyl cellulose, and polybutyl acrylate.
In one embodiment, the conductive agent is selected from at least one of carbon nanotubes, graphene, graphite, carbon fibers, conductive carbon black, acetylene black, and ketjen black.
The invention also provides a diaphragm, which comprises a diaphragm body and a coating layer positioned on one side surface of the diaphragm body, wherein the coating layer is formed by coating the slurry on one side surface of the diaphragm body and removing the solvent, or is formed by the polyamine carbon composite material in any embodiment, or is formed by the polyamine carbon composite material prepared by the preparation method of the polyamine carbon composite material in any embodiment.
In one embodiment, the membrane body is a polytetrafluoroethylene, polyvinylidene fluoride, polyethylene or polypropylene membrane body.
The invention also provides a lithium-sulfur battery, which comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the diaphragm is the diaphragm of any one of the embodiments, is arranged between the positive plate and the negative plate, isolates the positive plate from the negative plate, one side of the diaphragm, which comprises a coating layer, is close to the positive plate, and the electrolyte soaks the diaphragm, the positive plate and the negative plate.
The polyamine carbon composite material provided by the invention takes a carboxylated carbon-based material as a substrate, so that the overall conductivity of the material is enhanced. Wherein, the polyamine contains a large amount of nitrogen atoms, and can effectively absorb lithium polysulfide. The polyamine is uniformly coated on the surface of the carbon-based material, so that more lithium polysulfide conducts electrons through the carbon-based material as far as possible, the lithium polysulfide can continuously and fully participate in the charging and discharging process, and the utilization rate of the active substance is improved. In addition, the polyamine has strong film forming property, and is beneficial to forming a continuous and stable diaphragm coating layer subsequently. The polyamine carbon composite material can be further prepared into slurry and a diaphragm, can be applied to lithium-sulfur batteries, and improves the cycle performance of the lithium-sulfur batteries.
Drawings
Fig. 1 is a graph comparing the Cycle performance and the Coulombic efficiency of the lithium-sulfur battery prepared in example 1 with that of the lithium-sulfur battery prepared in comparative example 1, in which the abscissa Cycle number represents the number of cycles of the battery, the left ordinate Specific capacity represents the Specific discharge capacity, and the right ordinate Coulombic efficiency represents the Coulombic efficiency.
Fig. 2 is an electron microscope picture and an elemental analysis picture of the polyamine composite material prepared in example 1, wherein (a) the picture and (b) the picture show the electron microscope morphology pictures of the polyamine carbon composite material under different magnifications, and (c), (d) and (e) the three pictures are respectively the distribution maps of three elements of carbon, nitrogen and oxygen in (b).
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying embodiments and effect drawings. The examples set forth preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. The term "plurality" as used herein refers to two or more items.
One embodiment of the present invention provides a polyamine carbon composite material. The polyamine-carbon composite material comprises a carboxylated carbon-based material serving as a substrate and polyamine serving as a surface layer, wherein the polyamine is uniformly coated on the outer side surface and/or the inner pore surface of the carboxylated carbon-based material.
Optionally, the carboxylated carbon-based material is at least one of carboxylated graphene oxide, carboxylated carbon nanotubes, carboxylated graphite powder, carboxylated nanocarbon spheres, carboxylated nanocarbon rods, and carboxylated carbon fibers. The polyamine is at least one of ethylenediamine, propylenediamine, hexamethylenediamine, p-phenylenediamine, m-phenylenediamine, polyethyleneimine and derivatives thereof, chitosan and derivatives thereof, dopamine, 2,3,6,7,10, 11-hexa-amino-triphenyl-hexahydrochloride and triphenylene-2, 3,6,7,10, 11-hexa-amine hexahydrochloride.
Wherein the carbon-based material functions as a conductive substrate, and may be in the form of a sheet, a sphere, a rod, or an irregular particle, and may be solid, porous, or hollow. The polyamine can also coat the outer surface, the pore surface or the hollow inner surface of the carbon-based material according to the morphology of the selected carbon-based material. The polyamine is selected as the coating material in the invention for two reasons: one reason is that the polyamine material has a large proportion of nitrogen atoms, which means that the adsorption performance of the polyamine on lithium polysulfide is far better than that of other doped materials under the condition of the same added mass; another reason is that polyamines are universally water-soluble and have very good film-forming properties and tend to form continuous, uniform and stable coatings.
As one example, the carboxylated carbon-based material may be carboxylated graphene oxide and the polyamine may be carboxymethyl chitosan. The two materials are commercialized at present, are relatively simple to prepare and relatively low in price, and have good application prospects. In addition, the carboxylated carbon-based material can also be prepared by self, and a simple preparation method is to mix the strong oxidizing acid and the carbon-based material and then carry out heating reflux, so that the preparation process is simpler.
The polyamine carbon composite material provided by the embodiment can be applied to a separator of a lithium-sulfur battery. The composite material takes a carbon-based material with better conductivity as a substrate, the polyamine is uniformly coated on the carbon-based material, and when nitrogen atoms on the polyamine adsorb lithium polysulfide which is an intermediate product of the lithium-sulfur battery, a better conductive network can be provided, so that the adsorbed lithium polysulfide can still participate in the discharging process, the discharging specific capacity of the lithium-sulfur battery in the circulating process is improved, and the capacity attenuation is reduced.
The invention also provides a preparation method of the polyamine carbon composite material, which comprises the following steps in one specific embodiment.
Step 1, mixing an aqueous solution of a polyamine with a dispersion liquid containing a carboxylated carbon-based material to obtain a mixed solution.
It will be readily appreciated that the two raw materials are mixed in the aqueous solution in order to disperse the raw materials more uniformly and to bring the two raw materials into more intimate contact, so that the solution may be dispersed by simultaneous sonication and/or agitation. Another object of mixing in the aqueous solution is that, after the polyamine is dissolved in water, the amino group therein can have a positive charge by hydrolysis, and the carboxyl group has a negative charge by ionization in water, whereby the polyamine can easily achieve uniform coating of the carboxylated carbon-based material by electrostatic adsorption between ions, greatly simplifying the preparation process. Further, according to the principle, the degree of amino hydrolysis or carboxyl ionization in the solution can be controlled by adjusting the pH value, so that the stability and controllability of adsorption are maintained. Alternatively, the pH of the mixed solution may be 5 to 9, more specifically 6 to 8. The pH value can be adjusted by dropwise addition of a sodium hydroxide solution or a hydrochloric acid solution according to the ratio of the total amount of the carboxylated carbon-based material and the polyamine.
As an example, step 1 may be carried out as follows: and adding a polyamine aqueous solution into the aqueous dispersion of the carboxylated carbon-based material, performing magnetic stirring and ultrasonic dispersion, and meanwhile, dropwise adding a sodium hydroxide solution and hydrochloric acid, wherein the pH value of the solution is controlled to be 6-8. Wherein the concentration of the polyamine aqueous solution may be 0.5g/L to 1.5g/L, more specifically, 0.8g/L to 1.2 g/L.
And 2, carrying out solid-liquid separation on the mixed solution, and drying the solid material in the mixed solution to obtain the polyamine-carbon composite material.
The solid-liquid separation mode can be selected from filtration, vacuum filtration, centrifugation and other modes according to the actual production condition, and only needs to separate the solid part from the original mixed liquid. The drying means may be forced air drying, vacuum drying and freeze drying. The drying efficiency is high in the air-blast drying and the vacuum drying, and the defects are that the drying process is possibly accompanied with temperature rise, the polyamine composite material is possibly shrunk integrally, or the materials are bonded firmly and are difficult to crush. Freeze-drying can maintain the relatively loose structure of the polyamine composite material. The obtained polyamine carbon composite material can be continuously ground in modes of grinding and the like, so that the subsequent use is facilitated.
The preparation method is simple and easy to implement, and the carboxylated carbon-based material uniformly coated by the polyamine is easy to obtain, so that the preparation method has higher practical value.
One embodiment of the invention also provides slurry comprising a binder, a conductive agent, a solvent and the polyamine carbon composite material prepared by the preparation method, wherein the binder, the conductive agent, the solvent and the polyamine carbon composite material are uniformly mixed to form the slurry.
Optionally, the binder is at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, sodium alginate, sodium carboxymethylcellulose, hydroxypropyl cellulose, and polybutyl acrylate. The conductive agent is at least one of carbon nano tube, graphene, graphite, carbon fiber, conductive carbon black, acetylene black and Ketjen black. The solvent may be water or an organic solvent such as azomethylpyrrolidone, as long as it dissolves the selected binder well. The mixing mode can be ball milling, defoaming and centrifuging, stirring or ultrasonic dispersing, and can also be the combination of the modes.
One of the embodiments of the present invention also provides a diaphragm. The diaphragm comprises a diaphragm body and a coating layer positioned on one side surface of the diaphragm, wherein the coating layer is formed by coating the slurry prepared according to the embodiment on one side surface of the diaphragm body and removing a solvent, or is formed by the polyamine carbon composite material prepared by the embodiment, or is formed by the polyamine carbon composite material prepared by the preparation method of the polyamine carbon composite material.
The diaphragm body can be a high-molecular porous diaphragm, such as a polytetrafluoroethylene, polyvinylidene fluoride, polyethylene or polypropylene diaphragm body, as long as the diaphragm body can separate the positive electrode and the negative electrode of the battery, prevent the positive electrode and the negative electrode from short circuit, can be soaked by electrolyte and provide a channel for ion transmission.
The separator provided in the above embodiment may be applied to a lithium sulfur battery. For example, in one embodiment, the separator comprises a positive plate, a negative plate, a separator and an electrolyte, the separator is provided in the above embodiment, is arranged between the positive plate and the negative plate, separates the positive plate and the negative plate, and the side of the separator containing the coating layer is close to the positive plate, and the electrolyte infiltrates the separator, the positive plate and the negative plate.
One side of the diaphragm coated with the coating layer needs to be close to the positive plate because the coating layer needs to further conduct electrons through the carbon material in the coating layer after absorbing the lithium polysulfide, so that the absorbed lithium polysulfide can continuously participate in charging and discharging, the utilization rate of the active substance is improved, namely, the carbon-based material is uniformly coated by the polyamine, and the material can absorb the lithium polysulfide and conduct electrons at the same time.
As a specific example, the negative electrode may be a conventional lithium sheet negative electrode or a lithium copper composite tape; the anode can adopt a common carbon-sulfur composite electrode, and a person skilled in the art can also select an anode with a specific structure according to actual requirements; the electrolyte can be ether electrolyte or ester electrolyte.
In order to facilitate understanding of the contents of the embodiments, the polyamine composite separator according to the present invention and the method for preparing the same will be described in further detail, and specific examples and comparative examples performed according to the embodiments will be described below. The superiority of the present invention will be apparent from the following embodiments and effect tests.
The following raw materials are all commercially available without specific mention.
Example 1:
1) mixing a carboxymethyl chitosan aqueous solution with a carboxylated graphene oxide dispersion liquid, carrying out magnetic stirring for 0.5h, carrying out ultrasonic dispersion for 0.5h until the mixture is uniform, and controlling the pH value of the mixed solution to be 6-8. Wherein the concentration of the carboxymethyl chitosan aqueous solution is 1.0g/L, the concentration of the graphene oxide dispersion liquid is 5g/L, and the volume ratio of the carboxymethyl chitosan aqueous solution to the carboxylated graphene oxide dispersion liquid is 1: 1.
2) Freeze-drying the mixed solution, and grinding the dried solution until particles are invisible and obvious to naked eyes to obtain the carboxymethyl chitosan-graphene oxide composite material;
3) mixing a carboxymethyl chitosan-graphene oxide composite material, acetylene black and polyvinylidene fluoride according to a mass ratio of 6:2:2 to form slurry, coating the slurry on one surface of a polypropylene diaphragm to obtain a carboxymethyl chitosan-graphene oxide/polypropylene diaphragm, drying the carboxymethyl chitosan-graphene oxide/polypropylene diaphragm, and cutting the carboxymethyl chitosan-graphene oxide/polypropylene diaphragm into a circular diaphragm serving as a diaphragm of a lithium-sulfur battery.
Comparative example 1:
the polypropylene separator was directly used as a separator for a lithium sulfur battery.
Among them, the method of assembling the lithium sulfur battery in example 1 and comparative example 1 is as follows:
the sulfur composite acetylene black composite material is used as a positive electrode material, a metal lithium sheet is used as a negative electrode material, and 1M lithium bistrifluoromethanesulfonylimide electrolyte is dissolved in a 1, 3-dioxolane/glycol dimethyl ether mixed solution (the volume ratio is 1: 1).
Two important indexes of the battery performance are evaluated by the cycling stability and the charging and discharging specific capacity. The above examples and comparative examples were all subjected to 3 performance tests under the test conditions of 0.5C and the test voltage range of 1.7V to 2.8V, taking the median of 3 test results.
Fig. 1 shows the results of the battery cycle tests of example 1 and comparative example 1. As is apparent from fig. 1, in the case where the initial specific discharge capacity is close, the battery of example 1 including the polyamine carbon composite material still maintains 81% of the specific discharge capacity after 100 cycles of the cycle, and the capacity fade is much lower than that of comparative example 1. At the same time, the coulombic efficiency of the cell of example 1 was also much higher than that of comparative example 1, especially the coulombic efficiency of example 1 remained close to 100% all the time as the number of test cycles increased, while the coulombic efficiency of comparative example 1 had decreased significantly. By combining the comparison results, the polyamine composite diaphragm provided by the invention effectively relieves the shuttle effect of the lithium-sulfur battery.
Fig. 2(a) and 2(b) are microscopic topography graphs of the lamellar graphene oxide supported carboxymethyl chitosan, and the three graphs (c), (d) and (e) are distribution graphs of carbon, oxygen and nitrogen elements in the graph (a), respectively, and areas where the nitrogen element and the carbon element are located overlap with each other, which indicates that the polyamine is indeed uniformly supported on the graphene oxide.
The polyamine composite membrane provided by the invention comprises polyamine rich in amino and carbon-based material rich in carboxyl, and is synergistic. The occupation ratio of nitrogen atoms in a large number of amino groups and oxygen atoms in a large number of carboxyl groups of the material is high, so that lithium polysulfide can be effectively adsorbed, and the shuttle effect of polysulfide ions is relieved. Furthermore, electrostatic adsorption can be generated between amino and carboxyl, which is beneficial to the combination of the amino and the carboxyl, and the prepared polyamine composite diaphragm is uniform and stable. The polyamine composite diaphragm also has the advantages of environment-friendly and easily-obtained raw materials, low cost, simple preparation process, suitability for commercial production and the like, and the battery assembled by the polyamine composite diaphragm has low circulating capacity attenuation rate and good application prospect.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The polyamine-carbon composite material is characterized by comprising a carboxylated carbon-based material serving as a substrate and a polyamine serving as a surface layer, wherein the polyamine is uniformly coated on the outer side surface and/or the inner pore surface of the carboxylated carbon-based material.
2. The polyamine-carbon composite material of claim 1 wherein the carboxylated carbon-based material is selected from at least one of carboxylated graphene oxide, carboxylated carbon nanotubes, carboxylated graphite powder, carboxylated nanocarbon spheres, carboxylated nanocarbon rods and carboxylated carbon fibers; and/or
The polyamine is at least one selected from ethylenediamine, propylenediamine, hexamethylenediamine, p-phenylenediamine, m-phenylenediamine, polyethyleneimine derivatives, chitosan derivatives, dopamine, 2,3,6,7,10, 11-hexa-amino-triphenylhexahydrochloride and triphenylene-2, 3,6,7,10, 11-hexa-amino-hexahydrochloride.
3. The preparation method of the polyamine-carbon composite material is characterized by comprising the following steps:
1) mixing the water solution of polyamine with the dispersion liquid containing the carboxylated carbon-based material to obtain a mixed liquid;
2) and (3) carrying out solid-liquid separation on the mixed solution, and drying the solid material in the mixed solution.
4. The method for producing the polyamine-carbon composite material according to claim 3, wherein in the step 1), the pH value of the mixed solution is 5 to 9.
5. The method for producing a polyamine carbon composite material according to claim 3 or 4, wherein in the step 1), the concentration of the polyamine in the aqueous solution of the polyamine is 0.5g/L to 1.5 g/L.
6. A slurry comprising a binder, a conductive agent, a solvent, and the polyamine carbon composite material of claim 1 or 2, wherein the binder, the conductive agent, the solvent, and the polyamine carbon composite material are mixed to form a slurry-like mixture.
7. The slurry of claim 6, wherein the binder is selected from at least one of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, sodium alginate, sodium carboxymethylcellulose, hydroxypropylcellulose, and polybutylacrylate; and/or
The conductive agent is selected from at least one of carbon nanotubes, graphene, graphite, carbon fibers, conductive carbon black, acetylene black and ketjen black.
8. A separator comprising a separator body and a coating layer on one surface of the separator body, wherein the coating layer is formed by the polyamine carbon composite material according to claim 1 or 2, or the coating layer formed by the polyamine carbon composite material prepared by the method for preparing the polyamine carbon composite material according to any one of claims 3 to 5, or the coating layer formed by coating the slurry according to claim 6 or 7 on one surface of the separator body and removing the solvent.
9. The membrane of claim 8, wherein the membrane body is a polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, or polypropylene membrane.
10. A lithium-sulfur battery comprising a positive plate, a negative plate, a separator and an electrolyte, wherein the separator is the separator according to claim 8 or 9, is disposed between the positive plate and the negative plate, separates the positive plate from the negative plate, and has a coating layer-containing side close to the positive plate, and the electrolyte infiltrates the separator, the positive plate and the negative plate.
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| CN202010041044.4A CN111244370A (en) | 2020-01-15 | 2020-01-15 | Polyamine carbon composite material, slurry, diaphragm, lithium-sulfur battery and preparation method |
| US17/767,603 US20230183524A1 (en) | 2020-01-15 | 2020-12-29 | Polyamine composite material and preparation method therefor, slurry, separator, electrode sheet, and lithium-sulfur battery containing the same |
| PCT/CN2020/140863 WO2021143515A1 (en) | 2020-01-15 | 2020-12-29 | Polyamine composite material and preparation method therefor, slurry containing polyamine composite material, separator, electrode sheet, and lithium-sulfur battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021143515A1 (en) * | 2020-01-15 | 2021-07-22 | 华南师范大学 | Polyamine composite material and preparation method therefor, slurry containing polyamine composite material, separator, electrode sheet, and lithium-sulfur battery |
| CN114156600A (en) * | 2021-12-13 | 2022-03-08 | 溧阳天目先导电池材料科技有限公司 | Diaphragm containing mixed conductor coating and preparation method and application thereof |
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