CN111029544A - Preparation method of modified three-dimensional graphene coated sulfur positive electrode for lithium-sulfur battery - Google Patents
Preparation method of modified three-dimensional graphene coated sulfur positive electrode for lithium-sulfur battery Download PDFInfo
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Abstract
The invention discloses a preparation method of a modified three-dimensional graphene coated sulfur positive electrode for a lithium sulfur battery, which comprises the steps of carrying out oxidation stripping on graphite powder to form graphene oxide, then forming three-dimensional graphene through high-temperature heating and freeze drying, then carrying out sulfonation treatment on the three-dimensional graphene, then compounding the three-dimensional graphene with polyaniline through in-situ reaction to form a modified three-dimensional graphene/polyaniline composite material, and finally coating elemental sulfur in the modified three-dimensional graphene/polyaniline composite material by using a melt impregnation method, so that the purposes of inhibiting the dissolution and shuttling of polysulfide in an electrochemical reaction, improving the mechanical strength of the positive electrode material, improving the conductivity of the positive electrode material and inhibiting the volume change of the sulfur positive electrode in the charging and discharging processes are achieved.
Description
Technical Field
The invention relates to the technical field of lithium-sulfur batteries, in particular to a preparation method of a modified three-dimensional graphene-coated sulfur positive electrode for a lithium-sulfur battery.
Background
The lithium-sulfur battery is a battery system which is made by using elemental sulfur as a positive electrode and metal lithium as a negative electrode. Due to its ultra-high theoretical specific energy, it has received much attention in recent years. However, the low conductivity of elemental sulfur, the easy dissolution of polysulfide generated by electrochemical reaction, the poor mechanical properties of electrodes and other reasons cause the problems of poor cycle performance, fast capacity attenuation and the like of batteries, and the commercial development of lithium-sulfur batteries is restricted.
The three-dimensional graphene has a porous structure and a good three-dimensional conductive network, and is stable in chemical properties and high in mechanical strength. The sulfur electrode coating material is used for coating a sulfur elemental electrode, so that a buffer space with volume change can be provided for the sulfur electrode after charging and discharging, and the conductivity of the sulfur electrode is increased. The three-dimensional graphene is further compounded with an organic polymer to form a polymer network for capturing the generated polysulfide, inhibiting the polysulfide from being dissolved and shuttling to the surface of a metal lithium cathode, and effectively improving the electrochemical and safety performance of the lithium-sulfur battery.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a modified three-dimensional graphene coated sulfur positive electrode for a lithium sulfur battery, wherein the three-dimensional graphene is prepared by a hydrothermal method and is used as a basic framework, and then is sulfonated and polymerized with polyaniline, so that the problems of poor conductivity, easy dissolution of polysulfide and the like of the sulfur positive electrode of the lithium sulfur battery are solved.
The technical scheme of the invention is as follows:
a preparation method of a modified three-dimensional graphene coated sulfur positive electrode for a lithium-sulfur battery specifically comprises the following steps:
(1) and preparing graphene oxide: under the condition of ice-water bath, uniformly dissolving graphite powder and sodium nitrate in concentrated sulfuric acid, mixing to form a reaction solution, slowly adding potassium permanganate into the reaction solution, sequentially controlling the temperature of the reaction solution to be 15-25 ℃ for 1.3-1.7 hours, raising the temperature to be 30-40 ℃ and keeping the temperature for 0.8-1.2 hours, then adding deionized water into the reaction solution, raising the temperature of the reaction solution to be 90-100 ℃ and keeping the temperature for 30-50 minutes, finally adding hydrogen peroxide into the reaction solution, reacting for 50-70 minutes, washing and drying a reaction product after the reaction is finished, and obtaining graphene oxide; the reaction formula is as follows:
(2) and preparing three-dimensional graphene: dispersing the graphene oxide prepared in the step (1) in deionized water, performing ultrasonic treatment to form graphene oxide dispersion liquid, placing the graphene oxide dispersion liquid in a reaction kettle, heating to 90-110 ℃, keeping for 30-60 minutes, then heating to 160-200 ℃, keeping for 18-24 hours, naturally cooling to room temperature after the reaction is finished, and then washing and freeze-drying the generated graphene gel to obtain the three-dimensional graphene aerogel;
(3) and preparing the sulfonated modified three-dimensional graphene: dissolving the three-dimensional graphene aerogel prepared in the step (2) in deionized water for ultrasonic treatment, then adding isoamyl nitrite and 4-aniline sulfonic acid, reacting for 18-24 hours at 70-100 ℃, washing and freeze-drying the obtained product to form sulfonated modified three-dimensional graphene; the reaction is as follows:
(4) and preparing the modified three-dimensional graphene/polyaniline composite material: dissolving sulfonated modified three-dimensional graphene in deionized water, stirring at 0 ℃ to form a dispersion liquid of the modified three-dimensional graphene, simultaneously controlling the temperature at 0 ℃ to dissolve ammonium persulfate in a hydrochloric acid solution, adding aniline into the hydrochloric acid solution of the ammonium persulfate to form a mixed solution, slowly adding the mixed solution into the dispersion liquid of the modified three-dimensional graphene, stirring at 0 ℃, washing and freeze-drying the obtained product to obtain the modified three-dimensional graphene/polyaniline composite material; the reaction is as follows:
(5) preparing a modified three-dimensional graphene/polyaniline-coated sulfur positive electrode: and (3) pressing and molding the modified three-dimensional graphene/polyaniline composite material prepared in the step (4) by using a mold, then placing elemental sulfur on the molded modified three-dimensional graphene/polyaniline composite material, placing the elemental sulfur in a quartz tube in a vacuum environment, heating the quartz tube to 150-160 ℃ for 9-11 hours, and then cooling the quartz tube to room temperature to form the modified three-dimensional graphene/polyaniline-coated sulfur anode material.
In the step (1), the content ratio of the graphite powder, the sodium nitrate, the concentrated sulfuric acid, the potassium permanganate and the hydrogen peroxide is 10-20 g: 5-10g of 200-300ml of 25-50g of 120-200ml of concentrated sulfuric acid, wherein the concentration of the concentrated sulfuric acid is 10 mol/L.
In the step (1), after the reaction is finished, the reaction product is washed by deionized water, filtered and separated by a centrifuge, and the obtained product is ultrasonically cleaned by deionized water for 30-50 minutes and then dried at 80-100 ℃ for 18-25 hours to obtain the graphene oxide.
In the step (2), the ratio of the graphene oxide to the deionized water in the graphene oxide dispersion liquid is 2 g/L.
In the step (2), the generated graphene gel is firstly washed by deionized water, and then is subjected to freeze drying for 18-25 hours to obtain the three-dimensional graphene aerogel.
In the step (3), the content ratio of the three-dimensional graphene aerogel to the isoamyl nitrite to the 4-aniline sulfonic acid is 0.2-0.3g to 1-2 g: 0.6-1 ml.
And (3) centrifuging, filtering, washing and freeze-drying the obtained product to obtain the sulfonated modified three-dimensional graphene.
In the step (4), the mass ratio of the sulfonated modified three-dimensional graphene to the ammonium persulfate to the aniline is 1-1.5:5-6: 2-3.
In the step (5), the mass ratio of the elemental sulfur to the modified three-dimensional graphene/polyaniline composite material is 1:3-3: 1.
The invention has the advantages that:
according to the preparation method, graphite powder is oxidized and stripped to form graphene oxide, then three-dimensional graphene is formed by high-temperature heating and freeze drying, then three-dimensional graphene is sulfonated, and then is compounded with polyaniline through in-situ reaction to form a modified three-dimensional graphene/polyaniline composite material, and finally elemental sulfur is coated in the modified three-dimensional graphene/polyaniline composite material by using a melt impregnation method, so that the dissolution and shuttling of polysulfide in an electrochemical reaction are inhibited, the mechanical strength of a positive electrode material is improved, the conductivity of the positive electrode material is improved, and the volume change of a sulfur positive electrode in the charging and discharging process is inhibited.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a modified three-dimensional graphene coated sulfur positive electrode for a lithium-sulfur battery specifically comprises the following steps:
(1) and preparing graphene oxide: under the condition of ice-water bath, uniformly dissolving and dispersing 10g of graphite powder and 5g of sodium nitrate in 200ml of concentrated sulfuric acid to form a reaction solution, slowly adding 25g of potassium permanganate into the reaction solution, sequentially controlling the temperature of the reaction solution to be 20 ℃ for 1.5 hours, raising the temperature to 35 ℃ for 1 hour, then adding deionized water into the reaction solution, raising the temperature of the reaction solution to 95 ℃ and maintaining for 40 minutes, finally adding 120ml of hydrogen peroxide into the reaction solution, reacting for 60 minutes, washing a product with deionized water after the reaction is finished, filtering, separating with a centrifuge, ultrasonically cleaning the product with deionized water for 40 minutes, and drying at 90 ℃ for 24 hours to obtain graphene oxide;
(2) and preparing three-dimensional graphene: dispersing 1g of graphene oxide prepared in the step (1) in 500ml of deionized water, performing ultrasonic treatment to form graphene oxide dispersion liquid, placing 250ml of graphene oxide dispersion liquid in a reaction kettle, heating to 100 ℃, keeping for 40 minutes, then heating to 180 ℃, keeping for 20 hours, naturally cooling to room temperature after the reaction is completed, washing the generated graphene gel with deionized water, and then performing freeze drying for 24 hours to obtain the three-dimensional graphene aerogel;
(3) and preparing the sulfonated modified three-dimensional graphene: dissolving 0.2g of the three-dimensional graphene aerogel prepared in the step (2) in 50ml of deionized water, carrying out ultrasonic treatment for 30 minutes, then adding 1g of 4-aniline sulfonic acid with the concentration of 0.03mol/L and 0.6ml of isoamyl nitrite, reacting for 12 hours at 80 ℃ under stirring, centrifuging, filtering and washing the obtained product, and then carrying out freeze drying to form sulfonated modified three-dimensional graphene;
(4) and preparing the modified three-dimensional graphene/polyaniline composite material: dissolving 0.1g of sulfonated modified three-dimensional graphene in 10ml of deionized water, stirring at 0 ℃ for 30 minutes to form a dispersion liquid of the modified three-dimensional graphene, simultaneously controlling the temperature at 0 ℃ to dissolve 0.5g of ammonium persulfate in 15ml of hydrochloric acid solution with the concentration of 1M, adding 0.2g of aniline into the hydrochloric acid solution of the ammonium persulfate to form a mixed solution, slowly adding the mixed solution into the dispersion liquid of the modified three-dimensional graphene, stirring at 0 ℃, washing the obtained product with ethanol and water, and freeze-drying for 24 hours to obtain the modified three-dimensional graphene/polyaniline composite material;
(5) preparing a modified three-dimensional graphene/polyaniline-coated sulfur positive electrode: and (3) pressing and molding 0.1g of the modified three-dimensional graphene/polyaniline composite material prepared in the step (4) by using a mold, then placing 0.25g of elemental sulfur on the molded modified three-dimensional graphene/polyaniline composite material, placing the composite material in a quartz tube under a vacuum environment, heating the quartz tube to 155 ℃ for 10 hours, and cooling the quartz tube to room temperature to form the modified three-dimensional graphene/polyaniline-coated sulfur anode material.
Example 2
A preparation method of a modified three-dimensional graphene coated sulfur positive electrode for a lithium-sulfur battery specifically comprises the following steps:
(1) and preparing graphene oxide: under the condition of ice-water bath, uniformly dissolving and dispersing 20g of graphite powder and 10g of sodium nitrate in 300ml of concentrated sulfuric acid to form a reaction solution, slowly adding 50g of potassium permanganate into the reaction solution, sequentially controlling the temperature of the reaction solution to be 20 ℃ for 1.5 hours, raising the temperature to 35 ℃ for 1 hour, adding deionized water into the reaction solution, raising the temperature of the reaction solution to 95 ℃ and maintaining for 40 minutes, finally adding 200ml of hydrogen peroxide into the reaction solution, reacting for 60 minutes, washing a product with deionized water after the reaction is finished, filtering, separating with a centrifuge, ultrasonically cleaning the product with deionized water for 40 minutes, and drying at 90 ℃ for 24 hours to obtain graphene oxide;
(2) and preparing three-dimensional graphene: dispersing 2g of graphene oxide prepared in the step (1) in 1000ml of deionized water, performing ultrasonic treatment to form graphene oxide dispersion liquid, placing 500ml of graphene oxide dispersion liquid in a reaction kettle, heating to 110 ℃, keeping for 30 minutes, then heating to 200 ℃, keeping for 18 hours, naturally cooling to room temperature after the reaction is finished, washing the generated graphene gel with deionized water, and then performing freeze drying for 24 hours to obtain the three-dimensional graphene aerogel;
(3) and preparing the sulfonated modified three-dimensional graphene: dissolving 0.5g of the three-dimensional graphene aerogel prepared in the step (2) in 100ml of deionized water, carrying out ultrasonic treatment for 30 minutes, then adding 2g of 4-aniline sulfonic acid with the concentration of 0.03mol/L and 1ml of isoamyl nitrite, reacting for 12 hours at 80 ℃ under stirring, centrifuging, filtering and washing the obtained product, and then carrying out freeze drying to form sulfonated modified three-dimensional graphene;
(4) and preparing the modified three-dimensional graphene/polyaniline composite material: dissolving 0.2g of sulfonated modified three-dimensional graphene in 20ml of deionized water, stirring at 0 ℃ for 30 minutes to form a dispersion liquid of the modified three-dimensional graphene, simultaneously controlling the temperature at 0 ℃ to dissolve 1g of ammonium persulfate in 15ml of hydrochloric acid solution with the concentration of 1M, adding 0.5g of aniline in the hydrochloric acid solution of the ammonium persulfate to form a mixed solution, slowly adding the mixed solution into the dispersion liquid of the modified three-dimensional graphene, stirring at 0 ℃, washing the obtained product with ethanol and water, and freeze-drying for 24 hours to obtain the modified three-dimensional graphene/polyaniline composite material;
(5) preparing a modified three-dimensional graphene/polyaniline-coated sulfur positive electrode: and (3) pressing and molding 0.2g of the modified three-dimensional graphene/polyaniline composite material prepared in the step (4) by using a mold, then placing 0.2g of elemental sulfur on the molded modified three-dimensional graphene/polyaniline composite material, placing the composite material in a quartz tube under a vacuum environment, heating the quartz tube to 155 ℃ for 10 hours, and cooling the quartz tube to room temperature to form the modified three-dimensional graphene/polyaniline-coated sulfur anode material.
Example 3
A preparation method of a modified three-dimensional graphene coated sulfur positive electrode for a lithium-sulfur battery specifically comprises the following steps:
(1) and preparing graphene oxide: under the condition of ice-water bath, uniformly dissolving and dispersing 15g of graphite powder and 10g of sodium nitrate in 300ml of concentrated sulfuric acid to form a reaction solution, slowly adding 40g of potassium permanganate into the reaction solution, sequentially controlling the temperature of the reaction solution to be 20 ℃ for 1.5 hours, raising the temperature to 35 ℃ for 1 hour, adding deionized water into the reaction solution, raising the temperature of the reaction solution to 95 ℃ and maintaining for 40 minutes, finally adding 175ml of hydrogen peroxide into the reaction solution, reacting for 60 minutes, washing a product with deionized water after the reaction is finished, filtering, separating by using a centrifuge, ultrasonically cleaning the product with deionized water for 40 minutes, and drying at 90 ℃ for 24 hours to obtain graphene oxide;
(2) and preparing three-dimensional graphene: dispersing 1.5g of graphene oxide prepared in the step (1) in 750ml of deionized water, performing ultrasonic treatment for 20 minutes to form graphene oxide dispersion liquid, placing 500ml of graphene oxide dispersion liquid in a reaction kettle, heating to 90 ℃, keeping for 60 minutes, then heating to 190 ℃, keeping for 20 hours, naturally cooling to room temperature after the reaction is completed, washing the generated graphene gel with deionized water, and then performing freeze drying for 24 hours to obtain the three-dimensional graphene aerogel;
(3) and preparing the sulfonated modified three-dimensional graphene: dissolving 0.4g of the three-dimensional graphene aerogel prepared in the step (2) in 50ml of deionized water, carrying out ultrasonic treatment for 30 minutes, then adding 1.5g of 4-aniline sulfonic acid with the concentration of 0.03mol/L and 0.8ml of isoamyl nitrite, reacting for 12 hours at 80 ℃ under stirring, centrifuging, filtering, washing with water, and then carrying out freeze drying to form sulfonated modified three-dimensional graphene;
(4) and preparing the modified three-dimensional graphene/polyaniline composite material: dissolving 0.3g of sulfonated modified three-dimensional graphene in 30ml of deionized water, stirring at 0 ℃ for 30 minutes to form a dispersion liquid of the modified three-dimensional graphene, simultaneously controlling the temperature at 0 ℃ to dissolve 1.5g of ammonium persulfate in 15ml of hydrochloric acid solution with the concentration of 1M, adding 0.8g of aniline into the hydrochloric acid solution of the ammonium persulfate to form a mixed solution, slowly adding the mixed solution into the dispersion liquid of the modified three-dimensional graphene, stirring at 0 ℃, washing the obtained product with ethanol and water, and freeze-drying for 24 hours to obtain the modified three-dimensional graphene/polyaniline composite material;
(5) preparing a modified three-dimensional graphene/polyaniline-coated sulfur positive electrode: and (3) pressing and molding 0.3g of the modified three-dimensional graphene/polyaniline composite material prepared in the step (4) by using a mold, then placing 0.6g of elemental sulfur on the molded modified three-dimensional graphene/polyaniline composite material, placing the composite material in a quartz tube under a vacuum environment, heating the quartz tube to 155 ℃ for 10 hours, and cooling the quartz tube to room temperature to form the modified three-dimensional graphene/polyaniline-coated sulfur anode material.
Comparative example
Sublimed sulfur, acetylene black and PVDF are prepared into a sulfur positive electrode in a mass ratio of 7:2:1 to serve as a comparative example, the sulfur positive electrode and the modified three-dimensional graphene/polyaniline-coated sulfur positive electrode prepared in example 1 are prepared into a lithium metal negative electrode/PP membrane/sulfur positive electrode, electricity is buckled, and an electrical property test is carried out, and the test results are shown in Table 1.
Table 1 electrochemical performance in pinch-off of sulfur positive electrode in example 1 and comparative example
As can be seen from table 1, the sulfur positive electrode prepared in example 1 has great advantages in gram capacity exertion, capacity retention rate after cycle and rate capability, and it is fully demonstrated that the modified three-dimensional graphene-coated sulfur positive electrode of the present invention has good conductivity, cycle capability and rate capability.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A preparation method of a modified three-dimensional graphene coated sulfur positive electrode for a lithium-sulfur battery is characterized by comprising the following steps: the method specifically comprises the following steps:
(1) and preparing graphene oxide: under the condition of ice-water bath, uniformly dissolving graphite powder and sodium nitrate in concentrated sulfuric acid, mixing to form a reaction solution, slowly adding potassium permanganate into the reaction solution, sequentially controlling the temperature of the reaction solution to be 15-25 ℃ for 1.3-1.7 hours, raising the temperature to be 30-40 ℃ and keeping the temperature for 0.8-1.2 hours, then adding deionized water into the reaction solution, raising the temperature of the reaction solution to be 90-100 ℃ and keeping the temperature for 30-50 minutes, finally adding hydrogen peroxide into the reaction solution, reacting for 50-70 minutes, washing and drying a reaction product after the reaction is finished, and obtaining graphene oxide;
(2) and preparing three-dimensional graphene: dispersing the graphene oxide prepared in the step (1) in deionized water, performing ultrasonic treatment to form graphene oxide dispersion liquid, placing the graphene oxide dispersion liquid in a reaction kettle, heating to 90-110 ℃, keeping for 30-60 minutes, then heating to 160-200 ℃, keeping for 18-24 hours, naturally cooling to room temperature after the reaction is finished, and then washing and freeze-drying the generated graphene gel to obtain the three-dimensional graphene aerogel;
(3) and preparing the sulfonated modified three-dimensional graphene: dissolving the three-dimensional graphene aerogel prepared in the step (2) in deionized water for ultrasonic treatment, then adding isoamyl nitrite and 4-aniline sulfonic acid, reacting for 18-24 hours at 70-100 ℃, washing and freeze-drying the obtained product to form sulfonated modified three-dimensional graphene;
(4) and preparing the modified three-dimensional graphene/polyaniline composite material: dissolving sulfonated modified three-dimensional graphene in deionized water, stirring at 0 ℃ to form a dispersion liquid of the modified three-dimensional graphene, simultaneously controlling the temperature at 0 ℃ to dissolve ammonium persulfate in a hydrochloric acid solution, adding aniline into the hydrochloric acid solution of the ammonium persulfate to form a mixed solution, slowly adding the mixed solution into the dispersion liquid of the modified three-dimensional graphene, stirring at 0 ℃, washing and freeze-drying the obtained product to obtain the modified three-dimensional graphene/polyaniline composite material;
(5) preparing a modified three-dimensional graphene/polyaniline-coated sulfur positive electrode: and (3) pressing and molding the modified three-dimensional graphene/polyaniline composite material prepared in the step (4) by using a mold, then placing elemental sulfur on the molded modified three-dimensional graphene/polyaniline composite material, placing the elemental sulfur in a quartz tube in a vacuum environment, heating the quartz tube to 150-160 ℃ for 9-11 hours, and then cooling the quartz tube to room temperature to form the modified three-dimensional graphene/polyaniline-coated sulfur anode material.
2. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: in the step (1), the content ratio of the graphite powder, the sodium nitrate, the concentrated sulfuric acid, the potassium permanganate and the hydrogen peroxide is 10-20 g: 5-10g of 200-300ml of 25-50g of 120-200ml of concentrated sulfuric acid, wherein the concentration of the concentrated sulfuric acid is 10 mol/L.
3. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: in the step (1), after the reaction is finished, the reaction product is washed by deionized water, filtered and separated by a centrifuge, and the obtained product is ultrasonically cleaned by deionized water for 30-50 minutes and then dried at 80-100 ℃ for 18-25 hours to obtain the graphene oxide.
4. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: in the step (2), the ratio of the graphene oxide to the deionized water in the graphene oxide dispersion liquid is 2 g/L.
5. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: in the step (2), the generated graphene gel is firstly washed by deionized water, and then is subjected to freeze drying for 18-25 hours to obtain the three-dimensional graphene aerogel.
6. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: in the step (3), the content ratio of the three-dimensional graphene aerogel to the isoamyl nitrite to the 4-aniline sulfonic acid is 0.2-0.3g to 1-2 g: 0.6-1 ml.
7. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: and (3) centrifuging, filtering, washing and freeze-drying the obtained product to obtain the sulfonated modified three-dimensional graphene.
8. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: in the step (4), the mass ratio of the sulfonated modified three-dimensional graphene to the ammonium persulfate to the aniline is 1-1.5:5-6: 2-3.
9. The method for preparing the modified three-dimensional graphene-coated sulfur positive electrode for the lithium-sulfur battery according to claim 1, wherein the modified three-dimensional graphene-coated sulfur positive electrode comprises the following steps: in the step (5), the mass ratio of the elemental sulfur to the modified three-dimensional graphene/polyaniline composite material is 1:3-3: 1.
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Cited By (4)
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| CN111883754A (en) * | 2020-07-21 | 2020-11-03 | 合肥国轩高科动力能源有限公司 | Iron nitride-ordered mesoporous carbon composite material and preparation method and application thereof |
| CN112164771A (en) * | 2020-08-25 | 2021-01-01 | 合肥国轩高科动力能源有限公司 | Sulfur/polyaniline nanotube/reduced graphene oxide composite material and preparation method and application thereof |
| CN113659284A (en) * | 2021-08-05 | 2021-11-16 | 合肥国轩高科动力能源有限公司 | Diaphragm for lithium-sulfur battery and preparation method thereof |
| CN114085523A (en) * | 2021-10-13 | 2022-02-25 | 深圳市先进石墨烯科技有限公司 | Composite material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111883754A (en) * | 2020-07-21 | 2020-11-03 | 合肥国轩高科动力能源有限公司 | Iron nitride-ordered mesoporous carbon composite material and preparation method and application thereof |
| CN112164771A (en) * | 2020-08-25 | 2021-01-01 | 合肥国轩高科动力能源有限公司 | Sulfur/polyaniline nanotube/reduced graphene oxide composite material and preparation method and application thereof |
| CN113659284A (en) * | 2021-08-05 | 2021-11-16 | 合肥国轩高科动力能源有限公司 | Diaphragm for lithium-sulfur battery and preparation method thereof |
| CN114085523A (en) * | 2021-10-13 | 2022-02-25 | 深圳市先进石墨烯科技有限公司 | Composite material and preparation method and application thereof |
| CN114085523B (en) * | 2021-10-13 | 2023-09-29 | 深圳贝特瑞钠电新材料科技有限公司 | Composite material, preparation method and application thereof |
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Application publication date: 20200417 |