CN110931693B - Functional interlayer of lithium-sulfur battery and preparation method thereof - Google Patents
Functional interlayer of lithium-sulfur battery and preparation method thereof Download PDFInfo
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- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000011229 interlayer Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 67
- 229920002396 Polyurea Polymers 0.000 claims abstract description 61
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000010000 carbonizing Methods 0.000 claims abstract description 4
- 238000011068 loading method Methods 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 19
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 239000012300 argon atmosphere Substances 0.000 claims description 10
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 238000001291 vacuum drying Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000006258 conductive agent Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052744 lithium Inorganic materials 0.000 abstract description 10
- 229920001021 polysulfide Polymers 0.000 abstract description 10
- 239000005077 polysulfide Substances 0.000 abstract description 10
- 150000008117 polysulfides Polymers 0.000 abstract description 10
- 239000003575 carbonaceous material Substances 0.000 abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 4
- 239000013543 active substance Substances 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000001351 cycling effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000003763 carbonization Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
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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
- H01M50/431—Inorganic material
-
- 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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- 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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- 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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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Abstract
The technical scheme of the invention relates to a functional interlayer of a lithium-sulfur battery and a preparation method thereof, belonging to the field of material chemistry. The method comprises the steps of firstly preparing a polyurea porous material by taking toluene diisocyanate as a raw material, carbonizing the polyurea porous material, and loading the carbonized polyurea porous material on the surface of a 2400 diaphragm to obtain the functional diaphragm. The carbon material with the porous structure is obtained after the polyurea porous material prepared in the method is carbonized, nitrogen doping of a carbon material framework is realized, the porous structure can physically adsorb lithium polysulfide, the nitrogen doping can chemically adsorb the lithium polysulfide, and the two have synergistic effect, so that the lithium polysulfide generated in the charging and discharging processes of the lithium-sulfur battery can be effectively adsorbed, the loss of active substances of the positive electrode is reduced, and the cycling stability of the battery is improved.
Description
Technical Field
The technical scheme of the invention relates to a functional interlayer of a lithium-sulfur battery and a preparation method thereof, in particular to a method for preparing the functional interlayer by carbonizing a polyurea porous material, and belongs to the field of material chemistry.
Background
In recent years, with the increasingly prominent energy and environmental problems and the rapid development of electric vehicles, smart grids and energy storage technologies, people have made higher demands on energy conversion equipment. At present, the existing commercial energy conversion devices are mainly lithium ion batteries, but the traditional lithium ion batteries using transition metal oxides as the anode material cannot completely meet the requirement of electric appliances on high energy density. It has become important to develop a battery system having high energy density and high safety. Sulfur is one of the elements rich in natural resources, and has been proposed for use as a battery positive electrode since the 70 s of the 20 th century. The lithium-sulfur battery has a theoretical specific capacity of 1675mAh/g, and a lithium-sulfur battery system consisting of the lithium-sulfur battery and metal lithium has a mass energy density of 2600Wh/kg, which is 5 times that of the conventional lithium ion battery. Of course, the disadvantages of the lithium-sulfur battery are also fatal. Wherein the positive electrode material sulfur is an electronic and ionic insulator, and has an electronic conductivity of about 5 × 10－30S·cm－1(ii) a Meanwhile, polysulfide generated in the charging and discharging process can be dissolved in electrolyte, and under the influence of concentration difference, a shuttle effect is caused, so that the loss of active materials is caused, and the capacity is rapidly reduced. Furthermore, the discharge product is vulcanizedLithium is also an electronic and ionic insulator, and its density is very different from that of elemental sulfur, and the electrode undergoes huge volume expansion during charging and discharging. In addition, metallic lithium as a negative electrode causes dendrite, dead lithium, and electrode pulverization, resulting in deterioration of cycle performance of the battery, causing a problem in safety performance. Thus, the commercialization of the lithium sulfur battery has not been achieved.
In order to solve the problems, researchers at home and abroad adopt a plurality of methods, wherein the addition of the functional interlayer in the lithium-sulfur battery is an effective, simple and feasible method, and the functional interlayer is placed between the anode and the diaphragm and can achieve the effect of physically or chemically fixing the shuttle of polysulfide, so that the utilization rate of active substances of the anode is improved, and the overall performance of the lithium-sulfur battery is improved.
The porous material is a material with a network structure formed by interconnected or closed pores. According to different element compositions and bonding modes, porous materials are divided into three forms of inorganic materials, inorganic-organic hybrid materials and pure organic porous materials. Generally, inorganic materials and inorganic-organic hybrid porous materials, such as activated carbon, molecular sieves, etc., have non-designable molecular structures and non-adjustable chemical functions. The organic porous material is a new porous material, and is formed by connecting organic elements consisting of light elements through covalent bonds, so that the organic porous material has the characteristics of rich framework composition, large specific surface area, controllable pore diameter, low framework density, good chemical and physical properties, strong modifiability, various preparation methods and the like, and is widely applied to the fields of ion exchange, adsorption and separation, host-guest chemistry and the like.
Disclosure of Invention
The invention aims to provide a functional interlayer for a lithium-sulfur battery and a preparation method thereof, aiming at the defects in the prior art. The method comprises the steps of firstly preparing a polyurea porous material by taking toluene diisocyanate as a raw material, carbonizing the polyurea porous material, and loading the carbonized polyurea porous material on the surface of a 2400 diaphragm to obtain the functional diaphragm. The invention overcomes the defects of obvious shuttle effect of polysulfide and unstable electrochemical performance of the battery in the lithium-sulfur battery prepared by the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows:
(1) preparing a polyurea porous material:
uniformly mixing acetone and deionized water in equal volume, dropwise adding toluene diisocyanate under stirring, keeping the temperature constant at 40-60 ℃ for 3-6 hours after dropwise adding, centrifuging after reaction, collecting a bottom product, and drying the bottom product in a vacuum drying oven at 30-60 ℃ to obtain the powdery polyurea porous material.
(2) Carbonized polyurea porous material:
and (2) placing the polyurea porous material prepared in the step (1) into a tubular furnace, heating to 500-800 ℃ at the speed of 1-5 ℃/min under the argon atmosphere, preserving heat for 1-3 h, and then still cooling along with the furnace under the argon atmosphere to obtain carbonized polyurea porous material powder.
(3) Preparing a functional interlayer:
and (3) mixing the carbonized polyurea porous material powder prepared in the step (2), a conductive agent super p and a binder polyvinylidene fluoride according to a mass ratio of 8: 1, grinding for 1-2 hours by using a mortar until the materials are uniformly dispersed, then adding a 1-methyl-2-pyrrolidone (NMP) solution until the powder is black and sticky, uniformly coating the powder on a No. 2400 diaphragm, and carrying out vacuum drying for 12-24 hours at 40-60 ℃ to obtain the functional interlayer loaded with the carbonized polyurea porous material powder.
In the step (1), the volumes of the acetone and the deionized water are both 30-50 mL, and the dosage of the toluene diisocyanate is 10-20 mL.
Preferably, the dropping rate of the toluene diisocyanate in the step (1) is 0.1 to 0.3 mL/s.
Further, the temperature rise rate of the tubular furnace in the step (2) is inversely proportional to the dropping rate of the toluene diisocyanate in the step (1).
The constant temperature condition in the step (1) is realized by adopting an oil bath device, so that the influence of water vapor on the reaction in the water bath process is avoided.
The invention has the following beneficial effects:
the carbon material with the porous structure is obtained after the polyurea porous material prepared in the method is carbonized, and the polyurea material contains abundant nitrogen, so that the porous carbon material obtained by carbonization can realize nitrogen doping of a carbon material framework, the porous structure can physically adsorb lithium polysulfide, the nitrogen doping can chemically adsorb the lithium polysulfide, and the two have synergistic effect, so that the lithium polysulfide generated in the charging and discharging processes of the lithium-sulfur battery can be effectively adsorbed, the loss of active substances of a positive electrode is reduced, and the cycle stability of the battery is improved.
In addition, the invention takes toluene diisocyanate as a raw material, adopts a rapid dropwise adding method, so that the polyurea porous material obtained by reaction has a more obvious structure and is in staggered communication, when the carbonized polyurea porous material is used as a positive electrode material of a lithium-sulfur battery, the excellent porous structure can generate obvious adsorption effect on lithium polysulfide, and under the condition of rapid dropwise adding, the generation process of polyurea becomes very sensitive to the temperature change of a reaction system, and the polymerization rate of polyurea changes due to the fluctuation of temperature, so that an uneven polyurea material is formed.
Compared with a water bath heating mode, the problem that the polymerization rate of the polyurea is reduced by water vapor is thoroughly solved by adopting oil bath heating, and the adverse effect of the water vapor on the molding of the polyurea porous material structure is avoided.
In practice, the tightness of the polyurea porous material obtained increases with the increase of the dropping rate of the toluene diisocyanate, while the too tight polyurea porous material needs a volume release process in the carbonization process, so the temperature rising rate in the carbonization treatment process is lower than that in the carbonization process of the loose polyurea porous material.
Drawings
The invention is further illustrated with reference to the following figures and examples:
fig. 1 is a discharge specific capacity cycle chart of the functional separator of the porous material prepared in example 1 when the functional separator is applied to a lithium-sulfur battery.
Fig. 2 is a graph of rate performance of the functional separator of porous material prepared in example 1 when applied to a lithium-sulfur battery.
FIG. 3 is an SEM photograph of the porous material prepared in example 1.
Detailed Description
Example 1:
(1) preparing a polyurea porous material:
and (2) uniformly mixing 40mL of acetone and 40mL of deionized water, dropwise adding 15mL of toluene diisocyanate under the stirring condition, wherein the dropwise adding rate is 0.2mL/s, carrying out oil bath at 50 ℃ for 4 hours after the dropwise adding is finished, and centrifuging, washing and drying after the reaction is finished to obtain the powdery polyurea porous material.
(2) Carbonized polyurea porous material:
and (2) placing the polyurea porous material prepared in the step (1) into a tube furnace, heating to 600 ℃ at the speed of 3 ℃/min under the argon atmosphere, preserving heat for 2h, and then still cooling along with the furnace under the argon atmosphere to obtain carbonized polyurea porous material powder.
(3) Preparing a functional interlayer:
and (3) mixing the carbonized polyurea porous material prepared in the step (2), a conductive agent super p and a binder polyvinylidene fluoride according to the mass ratio of 8: 1, grinding for 2 hours by using a mortar until the materials are uniformly dispersed, then adding a 1-methyl-2-pyrrolidone (NMP) solution until the powder is black and sticky, uniformly coating the powder on a No. 2400 diaphragm, and carrying out vacuum drying for 12 hours at the temperature of 50 ℃ to obtain the functional interlayer loaded with the carbonized polyurea porous material.
Fig. 1 is a discharge specific capacity cycle diagram of the porous functional separator prepared in example 1 under 0.2C when applied to a lithium-sulfur battery. It can be seen from the figure that at the current density of 0.2C, the discharge specific capacity of the lithium-sulfur battery in the first cycle is up to 1610mAh/g, the specific capacity of the battery continuously decreases with the continuous circulation, 1595mAh/g still exists after 100 cycles of circulation, and the diaphragm has excellent electrochemical cycle performance when being applied to the lithium-sulfur battery.
Fig. 2 is a graph of rate performance of the functional separator of porous material prepared in example 1 when applied to a lithium-sulfur battery. As can be seen, the prepared lithium-sulfur battery still exhibited 1261mAh/g of capacity even at a high current density of 2C, while the specific discharge capacity was restored to 1541mAh/g when the current density was lowered to 0.2C again, indicating that the separator had excellent rate performance when applied to a lithium-sulfur battery.
Example 2:
(1) preparing a polyurea porous material:
and (2) uniformly mixing 50mL of acetone and 50mL of deionized water, dropwise adding 20mL of toluene diisocyanate under the stirring condition, wherein the dropping speed is 0.3mL/s, performing oil bath at 60 ℃ for 6 hours after the dropwise adding is completed, and centrifuging, washing and drying after the reaction is completed to obtain the powdery polyurea porous material.
(2) Carbonized polyurea porous material:
and (2) placing the polyurea porous material prepared in the step (1) into a tube furnace, heating to 500 ℃ at the speed of 1 ℃/min under the argon atmosphere, preserving heat for 1h, and then still cooling along with the furnace under the argon atmosphere to obtain carbonized polyurea porous material powder.
(3) Preparing a functional interlayer:
and (3) mixing the carbonized polyurea porous material prepared in the step (2), a conductive agent super p and a binder polyvinylidene fluoride according to the mass ratio of 8: 1, grinding for 2 hours by using a mortar until the materials are uniformly dispersed, then adding a 1-methyl-2-pyrrolidone (NMP) solution until the powder is black and sticky, uniformly coating the powder on a No. 2400 diaphragm, and carrying out vacuum drying for 24 hours at the temperature of 60 ℃ to obtain the functional interlayer loaded with the carbonized polyurea porous material.
Example 3:
(1) preparing a polyurea porous material:
and (2) uniformly mixing 30mL of acetone and 30mL of deionized water, dropwise adding 10mL of toluene diisocyanate under the stirring condition, wherein the dropwise adding speed is 0.1mL/s, carrying out oil bath at 40 ℃ for 3 hours after the dropwise adding is finished, and centrifuging, washing and drying after the reaction is finished to obtain the powdery polyurea porous material.
(2) Carbonized polyurea porous material:
and (2) placing the polyurea porous material prepared in the step (1) into a tube furnace, heating to 800 ℃ at the speed of 5 ℃/min under the argon atmosphere, preserving heat for 3h, and then still cooling along with the furnace under the argon atmosphere to obtain carbonized polyurea porous material powder.
(3) Preparing a functional interlayer:
and (3) mixing the carbonized polyurea porous material prepared in the step (2), a conductive agent super p and a binder polyvinylidene fluoride according to a mass ratio of 8: 1, grinding for 1 hour by using a mortar until the materials are uniformly dispersed, then adding a 1-methyl-2-pyrrolidone (NMP) solution until the powder is black and sticky, uniformly coating the powder on a No. 2400 diaphragm, and carrying out vacuum drying for 12-24 hours at 40 ℃ to obtain the functional interlayer loaded with the carbonized polyurea porous material.
Comparative example 1:
(1) preparing a polyurea porous material: and (2) uniformly mixing 40mL of acetone and 40mL of deionized water, dropwise adding 15mL of toluene diisocyanate under the stirring condition, wherein the dropping speed is 0.2mL/s, carrying out water bath for 4 hours at 50 ℃ after completing the dropwise adding, and centrifuging, washing and drying after completing the reaction to obtain the powdery polyurea porous material.
The other steps are the same as in example 1.
The comparative example is compared to example 1 except that the comparative example uses a water bath for heating and example 1 uses an oil bath for heating. The polymerization rate of the polyurea in this comparative example was reduced by 5.37% from that of the polyurea in example 1.
Claims (5)
1. The functional interlayer is characterized in that the functional interlayer is prepared by carbonizing a polyurea porous material and loading the carbonized polyurea porous material on the surface of a 2400 diaphragm; the functional interlayer is prepared by the following steps:
(1) preparing a polyurea porous material:
uniformly mixing acetone and deionized water in equal volume, dropwise adding toluene diisocyanate under the stirring condition, keeping the temperature constant at 40-60 ℃ for 3-6 hours, centrifuging after the reaction is finished, collecting a bottom product, and drying the bottom product in a vacuum drying oven at 30-60 ℃ to obtain a powdery polyurea porous material;
(2) carbonized polyurea porous material:
placing the polyurea porous material prepared in the step (1) in a tubular furnace, heating to 500-800 ℃ at a speed of 1-5 ℃/min under an argon atmosphere, preserving heat for 1-3 h, and then still cooling along with the furnace under the argon atmosphere to obtain carbonized polyurea porous material powder;
(3) preparing a functional interlayer:
and (3) mixing the carbonized polyurea porous material powder prepared in the step (2), a conductive agent super p and a binder polyvinylidene fluoride according to a mass ratio of 8: 1, grinding for 1-2 hours by using a mortar until the materials are uniformly dispersed, then adding a 1-methyl-2-pyrrolidone solution until the powder is black and sticky, uniformly coating the powder on a 2400 diaphragm, and carrying out vacuum drying for 12-24 hours at the temperature of 40-60 ℃ to obtain the functional interlayer loaded with the carbonized polyurea porous material powder.
2. The functional interlayer for lithium-sulfur batteries according to claim 1, wherein the volume of acetone and deionized water in step (1) is 30-50 mL, and the amount of toluene diisocyanate is 10-20 mL.
3. The functional separator for a lithium-sulfur battery according to claim 1 or 2, wherein the dropping rate of the toluene diisocyanate in the step (1) is 0.1 to 0.3 mL/s.
4. The functional barrier for lithium sulfur batteries according to claim 3, wherein the temperature rise rate of the tube furnace in step (2) is inversely proportional to the dropping rate of toluene diisocyanate in step (1).
5. The lithium sulfur battery functional barrier according to claim 1, wherein said constant temperature condition in step (1) is achieved using an oil bath.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102185158A (en) * | 2011-04-14 | 2011-09-14 | 武汉理工大学 | Lithium sulfur battery provided with adsorption layer |
| CN105679983A (en) * | 2016-03-11 | 2016-06-15 | 中南大学 | Modified diaphragm and preparation method and application therefor |
| CN108461694A (en) * | 2018-04-24 | 2018-08-28 | 清华大学 | A kind of economic benefits and social benefits composite diaphragm of lithium-sulfur cell and preparation method thereof |
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| US20150140411A1 (en) * | 2013-11-20 | 2015-05-21 | The Bergquist Company | Battery Cell Coatings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185158A (en) * | 2011-04-14 | 2011-09-14 | 武汉理工大学 | Lithium sulfur battery provided with adsorption layer |
| CN105679983A (en) * | 2016-03-11 | 2016-06-15 | 中南大学 | Modified diaphragm and preparation method and application therefor |
| CN108461694A (en) * | 2018-04-24 | 2018-08-28 | 清华大学 | A kind of economic benefits and social benefits composite diaphragm of lithium-sulfur cell and preparation method thereof |
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