CN113346091A - Positive electrode, preparation method thereof and lithium-sulfur battery - Google Patents
Positive electrode, preparation method thereof and lithium-sulfur battery Download PDFInfo
- Publication number
- CN113346091A CN113346091A CN202110633667.5A CN202110633667A CN113346091A CN 113346091 A CN113346091 A CN 113346091A CN 202110633667 A CN202110633667 A CN 202110633667A CN 113346091 A CN113346091 A CN 113346091A
- Authority
- CN
- China
- Prior art keywords
- positive electrode
- sulfur
- dispersion liquid
- aerogel
- material layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 92
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 62
- 239000011593 sulfur Substances 0.000 claims abstract description 62
- 239000004964 aerogel Substances 0.000 claims abstract description 48
- 239000002131 composite material Substances 0.000 claims abstract description 42
- 239000006185 dispersion Substances 0.000 claims description 68
- 239000011148 porous material Substances 0.000 claims description 54
- 239000007788 liquid Substances 0.000 claims description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 239000000853 adhesive Substances 0.000 claims description 18
- 230000001070 adhesive effect Effects 0.000 claims description 18
- 239000002135 nanosheet Substances 0.000 claims description 16
- 229910021389 graphene Inorganic materials 0.000 claims description 12
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 10
- 239000002041 carbon nanotube Substances 0.000 claims description 10
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 10
- 150000003346 selenoethers Chemical class 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000007711 solidification Methods 0.000 claims description 9
- 230000008023 solidification Effects 0.000 claims description 9
- 238000009777 vacuum freeze-drying Methods 0.000 claims description 9
- 239000002134 carbon nanofiber Substances 0.000 claims description 8
- 238000011068 loading method Methods 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000007710 freezing Methods 0.000 claims description 7
- 230000008014 freezing Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
- 239000002064 nanoplatelet Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 3
- 230000001351 cycling effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 20
- 239000005077 polysulfide Substances 0.000 description 14
- 229920001021 polysulfide Polymers 0.000 description 14
- 150000008117 polysulfides Polymers 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 238000005411 Van der Waals force Methods 0.000 description 5
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- QVYIMIJFGKEJDW-UHFFFAOYSA-N cobalt(ii) selenide Chemical compound [Se]=[Co] QVYIMIJFGKEJDW-UHFFFAOYSA-N 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 2
- 239000002048 multi walled nanotube Substances 0.000 description 2
- QHASIAZYSXZCGO-UHFFFAOYSA-N selanylidenenickel Chemical compound [Se]=[Ni] QHASIAZYSXZCGO-UHFFFAOYSA-N 0.000 description 2
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 2
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- 125000006091 1,3-dioxolane group Chemical group 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- XKTYXVDYIKIYJP-UHFFFAOYSA-N 3h-dioxole Chemical compound C1OOC=C1 XKTYXVDYIKIYJP-UHFFFAOYSA-N 0.000 description 1
- 229910001216 Li2S Inorganic materials 0.000 description 1
- 229910013075 LiBF Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- NEXSMEBSBIABKL-UHFFFAOYSA-N hexamethyldisilane Chemical compound C[Si](C)(C)[Si](C)(C)C NEXSMEBSBIABKL-UHFFFAOYSA-N 0.000 description 1
- DEUISMFZZMAAOJ-UHFFFAOYSA-N lithium dihydrogen borate oxalic acid Chemical compound B([O-])(O)O.C(C(=O)O)(=O)O.C(C(=O)O)(=O)O.[Li+] DEUISMFZZMAAOJ-UHFFFAOYSA-N 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
-
- 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
Abstract
The positive electrode comprises aerogel and an active sulfur component adsorbed on the aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped channels with consistent extension directions, the hole wall of each channel is a composite layer, the composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer, and the active sulfur component is adsorbed on the attachment material layer on the composite layer. The invention also provides a preparation method of the positive electrode and a lithium-sulfur battery using the positive electrode. The lithium-sulfur battery applying the positive electrode has better rate performance and cycling stability.
Description
Technical Field
The invention relates to the technical field of lithium-sulfur batteries, in particular to a positive electrode, a preparation method of the positive electrode and a lithium-sulfur battery using the positive electrode.
Background
The lithium-sulfur battery has ultrahigh theoretical specific capacity and energy density, and has great application value and development prospect in the field of batteries. During the charging and discharging of a lithium-sulfur battery, discharge products (e.g., Li) are generated2S2And Li2S), the sulfur simple substance and the discharge product have insulativity, so that the utilization rate of the active substance sulfur is low. In addition, under the action of the concentration gradient, the discharge product can be dissolved in the electrolyte and shuttled back and forth between the anode and the cathode, so that the utilization rate of the active substance sulfur is further reduced, and the rate performance and the cycle stability of the lithium-sulfur battery are poor.
Disclosure of Invention
In view of the above, it is desirable to provide a positive electrode to solve the problems of poor rate performance and poor cycle stability of the lithium-sulfur battery.
In addition, a preparation method of the positive electrode is also needed.
In addition, a lithium-sulfur battery is also needed.
The positive electrode comprises aerogel and an active sulfur component adsorbed on the aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped channels with consistent extension directions, the hole wall of each channel is a composite layer, the composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer, and the active sulfur component is adsorbed on the composite layer.
Further, the extending direction of the pore channel is consistent with the extending direction of the composite layer; and/or
The material of the adhesive material layer is at least one of carbon nano tubes, graphene oxide, sulfide, selenide and carbon nano fibers; and/or
The extending direction of the pore channel is consistent with the extending direction of the two-dimensional MXene material layer; and/or
The active sulfur component is Li2S8，Li2S6And Li2S4At least one of; and/or
The two-dimensional MXene material layer accounts for 50-99% of the mass of the aerogel.
The thickness of the pore wall of the pore channel is 5 nm-500 mu m; and/or
The width of the pore channel is 1-300 mu m; and/or
The sulfur loading capacity of the positive electrode is 3-20 mg cm-2。
Further, the two-dimensional MXene material in the two-dimensional MXene material layer is Ti3C2-MXene nanosheet, Nb2C-MXene nanosheet, V2C-MXene nanosheet, and Ti4N3-at least one of MXene nanoplatelets; and/or
A preparation method of a positive electrode comprises the following steps:
providing an adhesion material dispersion, a two-dimensional material dispersion, and a sulfur-containing solution;
mixing the adhesion material dispersion liquid and the two-dimensional material dispersion liquid to obtain a mixed dispersion liquid;
placing the mixed dispersion liquid into a mould, extending the mould containing the mixed dispersion liquid into a low-temperature container, and performing low-temperature directional freezing treatment on the mixed dispersion liquid to directionally solidify the mixed dispersion liquid;
carrying out vacuum freeze-drying treatment on the directionally solidified mixed dispersion liquid to obtain aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped pore channels with consistent extension directions, the pore wall of each pore channel is a composite layer, and each composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer; and
and dropwise adding the sulfur-containing solution onto the aerogel, and adsorbing active sulfur components in the sulfur-containing solution onto the composite layer to obtain the cathode.
Further, the temperature of the low-temperature directional freezing treatment is-300 ℃ to-10 ℃, and the solidification speed is 10-500cm h-1(ii) a And/or
The final vacuum degree of the vacuum freeze drying is 1-10 Pa, the temperature is-20-25 ℃, and the time is 12-72 hours.
Further, the preparation method of the positive electrode further comprises the following steps:
and adding a pH regulator into the mixed dispersion liquid so as to enable the pH value of the mixed dispersion liquid to be 6-8.
Further, the adhesive material dispersion liquid contains an adhesive material, a dispersant, and water.
Further, the dispersing agent is at least one of polyvinylpyrrolidone and cetyl trimethyl ammonium bromide;
the adhesive material is at least one of carbon nano tube, graphene oxide, sulfide, selenide and carbon nano fiber.
Further, the two-dimensional MXene material layer accounts for 50-99% of the aerogel by mass; and/or
The sulfur-containing solution accounts for 40-70% of the mass percentage of the positive electrode; and/or
The concentration of the sulfur-containing solution is 0.1-1M; and/or
The concentration of the two-dimensional material dispersion liquid is 1-15%; and/or
The concentration of the adhesive material dispersion liquid is 0.5-10%; and/or
The active sulfur component is Li2S8，Li2S6And Li2S4At least one of; and/or
The extending direction of the pore channel is consistent with the extending direction of the composite layer; and/or
The thickness of the pore wall of the pore channel is 5 nm-500 mu m; and/or
The width of the pore channel is 1-300 mu m; and/or
The sulfur loading capacity of the positive electrode is 3-20 mg cm-2。
A lithium sulfur battery comprising the positive electrode.
The positive electrode provided by the invention comprises aerogel and an active sulfur component adsorbed on the aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped pore channels with consistent extension directions, the pore wall of each pore channel is a composite layer, the composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer, and the active sulfur component is adsorbed on the composite layer. The composite layer can effectively prevent lithium polysulfide from shuttling back and forth between a positive electrode and a negative electrode. The honeycomb pore channels with the consistent extension direction and the two-dimensional MXene material layer of the pore walls can improve the electronic conductivity of the lithium-sulfur battery applying the anode and accelerate the transmission speed of electrons, so that the reaction kinetics of the lithium-sulfur battery are improved. The composite layer of the hole wall can adsorb a large amount of active sulfur components, has better physical barrier and chemical adsorption effects on polysulfide generated in the charging and discharging processes of the lithium-sulfur battery, and can promote the conversion between the active sulfur and the polysulfide, between the polysulfide and lithium sulfide, so that the utilization rate of the active sulfur components is further improved, and further, the rate capability and the cycle stability of the lithium-sulfur battery are improved.
Drawings
FIG. 1 is a scanning electron microscope image of an aerogel according to a first embodiment of the present invention at a low magnification.
Fig. 2 is a graph showing cycle performance of a lithium sulfur battery according to a first embodiment of the present invention.
FIG. 3 is a scanning electron micrograph of an aerogel according to example two of the present invention at a macroscopic level.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
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 herein in the description of the invention 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 all and any combination of one or more of the associated listed items.
In various embodiments of the present invention, for convenience in description and not in limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical couplings, either direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
The embodiment of the invention provides a positive electrode which is applied to a lithium-sulfur battery.
The positive electrode comprises aerogel and active sulfur components adsorbed on the aerogel, the aerogel comprises a plurality of honeycomb-shaped pore channels with the same extending direction, the pore wall of each pore channel is a composite layer, the composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer, and the active sulfur components are adsorbed on the composite layer.
In one embodiment, the aerogel has a pore volume of 14.6cm3 g-1Specific surface area of 53m2 g-1。
In one embodiment, the layer of adhesive material is made of an adhesive material that is superimposed by van der waals forces. The adhesive material in the adhesive material layer is at least one of carbon nano tube, graphene oxide, graphene, sulfide, selenide and carbon nano fiber. Preferably, the attachment material may be multi-walled carbon nanotubes. The sulfide is at least one of molybdenum sulfide and tungsten sulfide. The selenide is at least one of cobalt selenide and nickel selenide. The carbon nano tube, the graphene oxide and the carbon nano fiber can improve the electronic conductivity of the lithium-sulfur battery and accelerate the transmission speed of electrons, so that the reaction kinetics of the lithium-sulfur battery is improved. The sulfide and selenide can promote the conversion between polysulfide and lithium sulfide, thereby improving the rate capability and the cycling stability of the lithium-sulfur battery.
In one embodiment, the active sulfur component is Li2S8，Li2S6And Li2S4At least one of (1).
In one embodiment, the extending direction of the pore channel is consistent with the extending direction of the composite layer, so as to accelerate the transmission speed of electrons.
In one embodiment, the two-dimensional MXene material layer accounts for 50-99% of the total aerogel by mass, such as 60%, 70%, 75%, 80% or 90%.
In one embodiment, the thickness of the walls of the channels is between 5nm and 500 μm, such as 5nm, 10nm, 20nm, 30nm, 50nm, 200nm, 50 μm, 200 μm or 300 μm.
In one embodiment, the width of the channel is 1-300 μm, such as 5 μm, 10 μm, 50 μm, 100 μm, 200 μm, or 300 μm.
In one embodiment, the sulfur loading of the positive electrode is 3-20 mg cm-2For example, 3mg cm-2、5mg cm-2、10mg cm-2、15mg cm-2Or 20mg cm-2。
In one embodiment, the extending direction of the channel is consistent with the extending direction of the two-dimensional MXene material layer, so that the transmission speed of electrons is increased.
In one embodiment, the two-dimensional MXene material layer is prepared by stacking two-dimensional materials through Van der Waals force, and the two-dimensional materials are MXene nanosheets. The MXene nano-sheet is Ti3C2-MXene nanosheet, Nb2C-MXene nanosheet, V2C-MXene nanosheet, and Ti4N3-at least one of MXene nanoplatelets.
The positive electrode provided by the invention comprises aerogel and an active sulfur component adsorbed on the aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped pore channels with consistent extension directions, the pore wall of each pore channel is a composite layer, the composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer, and the active sulfur component is adsorbed on the composite layer. The composite layer can effectively prevent lithium polysulfide from shuttling back and forth between a positive electrode and a negative electrode. The honeycomb pore channels with the consistent extension direction and the two-dimensional MXene material layer of the pore walls can improve the electronic conductivity of the lithium-sulfur battery applying the anode and accelerate the transmission speed of electrons, so that the reaction kinetics of the lithium-sulfur battery are improved. The composite layer of the hole wall can adsorb a large amount of active sulfur components, has better physical barrier and chemical adsorption effects on polysulfide generated in the charging and discharging processes of the lithium-sulfur battery, and can promote the conversion between the active sulfur and the polysulfide, between the polysulfide and lithium sulfide, so that the utilization rate of the active sulfur components is further improved, and further, the rate capability and the cycle stability of the lithium-sulfur battery are improved.
In addition, in the charging and discharging process of the lithium-sulfur battery, the pore channel can provide a certain space for the volume expansion of sulfur so as to ensure the cycle stability of the lithium-sulfur battery applying the positive electrode. The aerogel adsorbed with the active sulfur component can be directly used as the positive electrode of the lithium-sulfur battery, and a conductive agent, a binder and a metal current collector do not need to be additionally added, so that the volume energy density of the lithium-sulfur battery applying the positive electrode can be improved.
The embodiment of the invention also provides a preparation method of the anode, which comprises the following steps:
step S1: providing an adhesion material dispersion liquid, a two-dimensional MXene material dispersion liquid and a sulfur-containing solution;
step S2: mixing the adhesion material dispersion liquid and the two-dimensional material dispersion liquid to obtain a mixed dispersion liquid;
step S3: placing the mixed dispersion liquid into a mould, extending the mould containing the mixed dispersion liquid into a low-temperature container, and performing low-temperature directional freezing treatment on the mixed dispersion liquid to directionally solidify the mixed dispersion liquid;
step S4: carrying out vacuum freeze-drying treatment on the directionally solidified mixed dispersion liquid to obtain aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped pore channels with consistent extension directions, the pore wall of each pore channel is a composite layer, and each composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer; and
step S5: and dropwise adding the sulfur-containing solution onto the aerogel, and adsorbing active sulfur components in the sulfur-containing solution on a composite layer to obtain the positive electrode.
In one embodiment, the aerogel has a pore volume of 14.6cm3 g-1Specific surface area of 53m2 g-1。
In one embodiment, the mold may be cryogenically oriented frozen in a container containing liquid nitrogen.
In one embodiment, the temperature of the low-temperature directional freezing treatment is-300 ℃ to-10 ℃, and the solidification speed is 10-500cm h-1。
In one embodiment, the final vacuum degree of the vacuum freeze drying is 1-10 Pa, the temperature is-20-25 ℃, and the time is 12-72 hours.
In one embodiment, the extending direction of the pore channel is consistent with the extending direction of the composite layer, so as to accelerate the transmission speed of electrons.
In one embodiment, the thickness of the walls of the channels is between 5nm and 500 μm, such as 5nm, 10nm, 20nm, 30nm, 50nm, 200nm, 50 μm, 200 μm or 300 μm.
In one embodiment, the width of the channel is 1-300 μm, such as 5 μm, 10 μm, 50 μm, 100 μm, 200 μm, or 300 μm.
In one embodiment, the concentration of the adhesion material dispersion is 0.5-10%, for example, 1%, 2%, 5%, 8%, or 10%.
In one embodiment, the layer of adhesive material is made of an adhesive material that is superimposed by van der waals forces. The adhesive material in the adhesive material layer is at least one of carbon nano tube, graphene oxide, graphene, sulfide, selenide and carbon nano fiber. Preferably, the attachment material may be multi-walled carbon nanotubes. The sulfide is at least one of molybdenum sulfide and tungsten sulfide. The selenide is at least one of cobalt selenide and nickel selenide. The carbon nano tube, the graphene oxide and the carbon nano fiber can improve the electronic conductivity of the lithium-sulfur battery and accelerate the transmission speed of electrons, so that the reaction kinetics of the lithium-sulfur battery is improved. The sulfide and selenide can promote the conversion between polysulfide and lithium sulfide, thereby improving the rate capability and the cycling stability of the lithium-sulfur battery.
In one embodiment, the two-dimensional MXene material layer accounts for 50-99% of the total aerogel by mass, such as 60%, 70%, 75%, 80% or 90%.
In one embodiment, the extending direction of the pore channel is consistent with the extending direction of the composite layer, so as to accelerate the transmission speed of electrons.
In one embodiment, the two-dimensional MXene material layer is prepared by stacking two-dimensional MXene materials through van der Waals force, and the two-dimensional materials are MXene nanosheets. The MXene nano-sheet is Ti3C2-MXene nanosheet, Nb2C-MXene nanosheet, V2C-MXene nanosheet, and Ti4N3-at least one of MXene nanoplatelets.
The concentration of the two-dimensional MXene material dispersion liquid is 1-15%, for example, 1%, 2%, 2.5%, 3%, 3.5% or 5%.
In one embodiment, the sulfur-containing solution has a concentration of 0.1-1M, and contains an active sulfur component and a solvent, wherein the solvent may be diethylene glycol dimethyl ether (DME) and/or 1, 3-Dioxolane (DOL) solvent.
In one embodiment, the active sulfur component is Li2S8，Li2S6And Li2S4At least one of (1).
In one embodiment, the sulfur-containing solution accounts for 40 to 70% by mass of the positive electrode, for example, 40%, 50%, 60%, or 70%.
In one embodiment, the sulfur loading of the positive electrode is 3-20 mg cm-2For example, 3mg cm-2、5mg cm-2、10mg cm-2、15mg cm-2Or 20mg cm-2。
In the preparation method of the anode provided by the invention, the mixed dispersion liquid is subjected to low-temperature directional freezing treatment, and water in the mixed dispersion liquid can be solidified into ice crystals with certain shapes. Because the path of the die extending into the low-temperature container is unidirectional, the direction of the ice crystals in the unidirectional solidification process is also unidirectional. As the mold gradually extends into the cryogen vessel, ice crystals continue to grow in their direction of solidification. The two-dimensional MXene material is stacked by Van der Waals force and solidified on the surface of the ice crystal along the solidification direction of the ice crystal to form a plurality of two-dimensional MXene material layers. The adhesive material is solidified on the two-dimensional MXene material layer along the solidification direction of the ice crystals to form the adhesive material layer. The extending direction of the composite layer is parallel to the forming direction of the ice crystals. In the vacuum freeze drying process, the ice crystals are sublimated to form pore channels with consistent extension directions, the aerogel is obtained, the pore walls of the pore channels of the aerogel are composite layers, and the composite layers can effectively prevent lithium polysulfide from reciprocating between a positive electrode and a negative electrode. The honeycomb pore channels with the consistent extension direction and the two-dimensional MXene material layer can improve the electronic conductivity of the lithium-sulfur battery applying the anode and accelerate the transmission speed of electrons, thereby improving the utilization rate of active sulfur components. The composite layer of the hole wall can adsorb a large amount of active sulfur components, has a good chemical adsorption effect on polysulfide generated in the charging and discharging process of the lithium-sulfur battery, and can promote the conversion between the active sulfur and the polysulfide, between the polysulfide and lithium sulfide, so that the utilization rate of the active sulfur components is further improved, and further the rate capability and the cycle stability of the lithium-sulfur battery are improved.
In addition, in the charging and discharging process of the lithium-sulfur battery, the pore channel can provide a certain space for the volume expansion of sulfur so as to ensure the cycle stability of the lithium-sulfur battery applying the positive electrode. The aerogel adsorbed with the active sulfur component can be directly used as the positive electrode of the lithium-sulfur battery, and a conductive agent, a binder and a metal current collector do not need to be additionally added, so that the volume energy density of the lithium-sulfur battery applying the positive electrode can be improved.
The preparation method of the positive electrode further comprises the following steps:
and adding a pH regulator into the mixed dispersion liquid so as to enable the pH value of the mixed dispersion liquid to be 6-8.
The pH of the mixed dispersion is preferably 7.
The pH regulator may be at least one of ammonia water, sodium carbonate, sodium bicarbonate, disodium hydrogen phosphate, and sodium citrate.
According to the technical scheme, a pH regulator is added into the mixed dispersion liquid, so that the pH value of the mixed dispersion liquid is 6-8. When the pH value of the mixed dispersion liquid is close to 7, the ordered arrangement of the pore channels and the two-dimensional MXene material layer of the aerogel is facilitated.
The embodiment of the invention also provides a lithium-sulfur battery.
The lithium-sulfur battery comprises the positive electrode, a diaphragm, a lithium negative electrode and a lithium-sulfur electrolyte, and is assembled into the lithium-sulfur battery of the first embodiment.
In an embodiment, the membrane may be a polyethylene membrane or a polypropylene membrane.
In one embodiment, the lithium sulfur electrolyte contains an ether solvent, a lithium salt, lithium nitrate, and an additive. The ether solvent includes a first solvent and a second solvent. The first solvent is 1, 3-dioxolane and/or 1, 4-dioxane. The second solvent is any one of ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether. The lithium salt is lithium hexafluorophosphate (LiPF)6) Lithium tetrafluoroborate (LiBF)4) Lithium bistrifluoromethanesulfonimide (LiTFSI), lithium bistrifluorosulfonimide (LiFSI), and lithium dioxalate borate (LiBOB). The additive is any one of 3-aminopropyltriethoxysilane, hexamethyldisilane and tetraethoxysilane.
Since the lithium-sulfur battery adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The present invention will be specifically described below with reference to specific examples.
Example one
3g of a 5% carbon nanotube dispersion and 18g of 2.5% Ti were provided3C2-MXene dispersion and a concentration of 0.5mol L-1Li of (2)2S6A solution;
mixing the carbon nanotube dispersion and Ti3C2-MXene dispersion to obtain a mixed dispersion;
filling the mixed dispersion into a circular mold;
the mold was set at 50cm h-1The solidification rate of (2) is extended into a container filled with liquid nitrogen until the mixed dispersion liquid in the mold is solidified;
vacuum freeze-drying the solidified mixed dispersion at-5 deg.C for 24h, and finally at-0 deg.C for 48h, when the vacuum degree is 1Pa, obtaining aerogel of example I (see FIG. 1);
subjecting the Li to2S6The solution was added dropwise to the aerogel of example one, the Li2S6Li in solution2S6Adsorbing the carbon dioxide solution on the aerogel of the first example to obtain a cathode of the first example, wherein the sulfur loading of the cathode of the first example is 5mg cm-2(ii) a And
the positive electrode, the polyethylene separator, the lithium negative electrode, and the lithium sulfur electrolyte solution of example one were assembled into the lithium sulfur battery of example one. The cycle performance of the lithium-sulfur battery of the first embodiment is shown in fig. 2, and the capacity fading rate of the battery is low after the battery is cycled for 150 times under the current density of 0.5C. This indicates that the lithium-sulfur battery of the example has better cycle stability.
Example two
2.5g of a graphene oxide dispersion having a concentration of 1% and 3g of Ti having a concentration of 2.5% were provided3C2-MXene dispersion, ammonia water, and concentration of 0.5mol L-1Li of (2)2S6A solution;
mixing the graphene oxide dispersion and Ti3C2-MXene dispersion to obtain a mixed dispersion;
adding the ammonia water into the mixed dispersion liquid, and adjusting the pH value of the mixed dispersion liquid to 7;
filling the mixed dispersion into a circular mold;
the mold was set at 50cm h-1The solidification rate of (2) is extended into a container filled with liquid nitrogen until the mixed dispersion liquid in the mold is solidified;
vacuum freeze-drying the solidified mixed dispersion at-5 deg.C for 24h, and finally at-0 deg.C for 48h, when the vacuum degree is 1Pa, obtaining aerogel of example two (see FIG. 3);
subjecting the Li to2S6The solution was added dropwise to the aerogel of example two, the Li2S6Li in solution2S6Adsorbing the carbon dioxide solution on the aerogel of example II to obtain an anode of example II, wherein the sulfur loading of the anode of example II is 5mg cm-2(ii) a And
the positive electrode, the polyethylene separator, the lithium negative electrode, and the lithium sulfur electrolyte of example two were assembled into the lithium sulfur battery of example two.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.
Claims (10)
1. The positive electrode is characterized by comprising aerogel and active sulfur components adsorbed on the aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped pore channels with consistent extension directions, the pore wall of each pore channel is a composite layer, the composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer, and the active sulfur components are adsorbed on the composite layer.
2. The positive electrode according to claim 1, wherein an extending direction of the cell channels coincides with an extending direction of the composite layer; and/or
The material of the adhesive material layer is at least one of carbon nano tubes, graphene oxide, sulfide, selenide and carbon nano fibers; and/or
The extending direction of the pore channel is consistent with the extending direction of the two-dimensional MXene material layer; and/or
The active sulfur component is Li2S8，Li2S6And Li2S4At least one of; and/or
The two-dimensional MXene material layer accounts for 50-99% of the mass of the aerogel; and/or
The thickness of the pore wall of the pore channel is 5 nm-500 mu m; and/or
The width of the pore channel is 1-300 mu m; and/or
The sulfur loading capacity of the positive electrode is 3-20 mg cm-2。
3. The positive electrode of claim 1, wherein the two-dimensional MXene material in the two-dimensional MXene material layer is Ti3C2-MXene nanosheet, Nb2C-MXene nanosheet, V2C-MXene nanosheet, and Ti4N3-at least one of MXene nanoplatelets.
4. A method for preparing a positive electrode is characterized by comprising the following steps:
providing an adhesion material dispersion, a two-dimensional material dispersion, and a sulfur-containing solution;
mixing the adhesion material dispersion liquid and the two-dimensional material dispersion liquid to obtain a mixed dispersion liquid;
placing the mixed dispersion liquid into a mould, extending the mould containing the mixed dispersion liquid into a low-temperature container, and performing low-temperature directional freezing treatment on the mixed dispersion liquid to directionally solidify the mixed dispersion liquid;
carrying out vacuum freeze-drying treatment on the directionally solidified mixed dispersion liquid to obtain aerogel, wherein the aerogel comprises a plurality of honeycomb-shaped pore channels with consistent extension directions, the pore wall of each pore channel is a composite layer, and each composite layer comprises a two-dimensional MXene material layer and an attachment material layer attached to the two-dimensional MXene material layer; and
and dropwise adding the sulfur-containing solution onto the aerogel, and adsorbing active sulfur components in the sulfur-containing solution onto the composite layer to obtain the cathode.
5. The method for preparing the positive electrode according to claim 4, wherein the temperature of the low-temperature directional freezing treatment is-300 ℃ to-10 ℃, and the solidification speed is 10-500cm h-1(ii) a And/or
The final vacuum degree of the vacuum freeze drying is 1-10 Pa, the temperature is-20-25 ℃, and the time is 12-72 hours.
6. The method for producing a positive electrode according to claim 4, further comprising the steps of:
and adding a pH regulator into the mixed dispersion liquid so as to enable the pH value of the mixed dispersion liquid to be 6-8.
7. The method for producing a positive electrode according to claim 4, wherein the binder dispersion liquid contains a binder, a dispersant, and water.
8. The method for producing a positive electrode according to claim 7, wherein the dispersant is at least one of polyvinylpyrrolidone and cetyltrimethylammonium bromide;
the adhesive material is at least one of carbon nano tube, graphene oxide, sulfide, selenide and carbon nano fiber.
9. The preparation method of the positive electrode according to claim 4, wherein the mass percentage of the two-dimensional MXene material layer in the aerogel is 50-99%; and/or
The sulfur-containing solution accounts for 40-70% of the mass percentage of the positive electrode; and/or
The concentration of the sulfur-containing solution is 0.1-1M; and/or
The concentration of the two-dimensional material dispersion liquid is 1-15%; and/or
The concentration of the adhesive material dispersion liquid is 0.5-10%; and/or
The active sulfur component is Li2S8，Li2S6And Li2S4At least one of; and/or
The extending direction of the pore channel is consistent with the extending direction of the composite layer; and/or
The thickness of the pore wall of the pore channel is 5 nm-500 mu m; and/or
The width of the pore channel is 1-300 mu m; and/or
The sulfur loading capacity of the positive electrode is 3-20 mg cm-2。
10. A lithium-sulfur battery, characterized in that it comprises a positive electrode according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110633667.5A CN113346091A (en) | 2021-06-07 | 2021-06-07 | Positive electrode, preparation method thereof and lithium-sulfur battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110633667.5A CN113346091A (en) | 2021-06-07 | 2021-06-07 | Positive electrode, preparation method thereof and lithium-sulfur battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113346091A true CN113346091A (en) | 2021-09-03 |
Family
ID=77475111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110633667.5A Pending CN113346091A (en) | 2021-06-07 | 2021-06-07 | Positive electrode, preparation method thereof and lithium-sulfur battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113346091A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114361386A (en) * | 2021-12-31 | 2022-04-15 | 惠州市豪鹏科技有限公司 | Pole piece, preparation method thereof and battery |
| CN114797747A (en) * | 2022-05-06 | 2022-07-29 | 中国石油大学(华东) | Super-elastic and high-adsorbability MXene aerogel and preparation method thereof |
| CN115064663A (en) * | 2022-08-18 | 2022-09-16 | 昆明理工大学 | Preparation method and application of MXene-based gel-state positive electrode |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016192389A1 (en) * | 2015-06-03 | 2016-12-08 | 中国地质大学（武汉） | Lithium sulfur battery composite positive electrode material and preparation method thereof |
| CN110429242A (en) * | 2019-07-12 | 2019-11-08 | 大连理工大学 | A kind of compound lithium an- ode and its synthetic method based on MXene aeroge |
| CN111403716A (en) * | 2020-03-27 | 2020-07-10 | 清华大学深圳国际研究生院 | Self-supporting lithium-sulfur battery positive plate, preparation method thereof and lithium-sulfur battery |
| CN111668453A (en) * | 2020-07-14 | 2020-09-15 | 合肥工业大学 | Flexible self-supporting positive electrode material and preparation method and application thereof |
| CN111825091A (en) * | 2020-05-07 | 2020-10-27 | 武汉理工大学 | Three-dimensional graphene composite material loaded with single-layer flower-like MXene nanosheets and preparation method and application thereof |
-
2021
- 2021-06-07 CN CN202110633667.5A patent/CN113346091A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016192389A1 (en) * | 2015-06-03 | 2016-12-08 | 中国地质大学（武汉） | Lithium sulfur battery composite positive electrode material and preparation method thereof |
| CN110429242A (en) * | 2019-07-12 | 2019-11-08 | 大连理工大学 | A kind of compound lithium an- ode and its synthetic method based on MXene aeroge |
| CN111403716A (en) * | 2020-03-27 | 2020-07-10 | 清华大学深圳国际研究生院 | Self-supporting lithium-sulfur battery positive plate, preparation method thereof and lithium-sulfur battery |
| CN111825091A (en) * | 2020-05-07 | 2020-10-27 | 武汉理工大学 | Three-dimensional graphene composite material loaded with single-layer flower-like MXene nanosheets and preparation method and application thereof |
| CN111668453A (en) * | 2020-07-14 | 2020-09-15 | 合肥工业大学 | Flexible self-supporting positive electrode material and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| BIN ZHANG，ET AL.: "Lamellar MXene Composite Aerogels with Sandwiched Carbon Nanotubes Enable Stable Lithium–Sulfur Batteries with a High Sulfur Loading", 《ADVANCED FUNCTIONAL MATERIALS》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114361386A (en) * | 2021-12-31 | 2022-04-15 | 惠州市豪鹏科技有限公司 | Pole piece, preparation method thereof and battery |
| CN114361386B (en) * | 2021-12-31 | 2024-01-23 | 惠州市豪鹏科技有限公司 | Pole piece, preparation method thereof and battery |
| CN114797747A (en) * | 2022-05-06 | 2022-07-29 | 中国石油大学(华东) | Super-elastic and high-adsorbability MXene aerogel and preparation method thereof |
| CN114797747B (en) * | 2022-05-06 | 2023-09-05 | 中国石油大学(华东) | Super-elastic and high-adsorptivity MXene aerogel and preparation method thereof |
| CN115064663A (en) * | 2022-08-18 | 2022-09-16 | 昆明理工大学 | Preparation method and application of MXene-based gel-state positive electrode |
| CN115064663B (en) * | 2022-08-18 | 2022-10-28 | 昆明理工大学 | Preparation method and application of MXene-based gel-state positive electrode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhao et al. | SnO2 as advanced anode of alkali‐ion batteries: inhibiting Sn coarsening by crafting robust physical barriers, void boundaries, and heterophase interfaces for superior electrochemical reaction reversibility | |
| Lin et al. | Two-dimensional transition metal dichalcogenides in supercapacitors and secondary batteries | |
| Wang et al. | Graphene-based composites for electrochemical energy storage | |
| Xu et al. | Exploring metal organic frameworks for energy storage in batteries and supercapacitors | |
| CN113346091A (en) | Positive electrode, preparation method thereof and lithium-sulfur battery | |
| Wu et al. | Hierarchical heterostructures of NiO nanosheet arrays grown on pine twig-like β-NiS@ Ni3S2 frameworks as free-standing integrated anode for high-performance lithium-ion batteries | |
| Hayner et al. | Materials for rechargeable lithium-ion batteries | |
| Chen et al. | Tuning interface bridging between MoSe 2 and three-dimensional carbon framework by incorporation of MoC intermediate to boost lithium storage capability | |
| Liu et al. | Topological construction of phosphorus and carbon composite and its application in energy storage | |
| Wang et al. | Anchoring hollow MoO2 spheres on graphene for superior lithium storage | |
| Bashir et al. | Progress in 3D-MXene electrodes for lithium/sodium/potassium/magnesium/zinc/aluminum-ion batteries | |
| Zhang et al. | Functional porous carbon-based composite electrode materials for lithium secondary batteries | |
| Park et al. | Three-dimensional aligned mesoporous carbon nanotubes filled with Co3O4 nanoparticles for Li-ion battery anode applications | |
| Fang et al. | Mesoporous carbon nanotube aerogel-sulfur cathodes: A strategy to achieve ultrahigh areal capacity for lithium-sulfur batteries via capillary action | |
| Ni et al. | Layer-structured carbonaceous materials for advanced Li-ion and Na-ion batteries: Beyond graphene | |
| Chen et al. | Constructing layered double hydroxide fences onto porous carbons as high-performance cathodes for lithium–sulfur batteries | |
| Li et al. | Flexible self-supporting Ni2P@ N-doped carbon anode for superior rate and durable sodium-ion storage | |
| KR20130056668A (en) | Composite negative active material, method of preparing the same and lithium secondary battery comprising the same | |
| Zhang et al. | Emerging applications of atomic layer deposition for lithium-sulfur and sodium-sulfur batteries | |
| Xiao et al. | Building sandwich-like carbon coated Si@ CNTs composites as high-performance anode materials for lithium-ion batteries | |
| Kamisan et al. | Recent advances on graphene-based materials as cathode materials in lithium-sulfur batteries | |
| Zang et al. | Recent advances of 2D nanomaterials in the electrode materials of lithium-ion batteries | |
| Yuan et al. | Corn stalk-derived activated carbon with a stacking sheet-like structure as sulfur cathode supporter for lithium/sulfur batteries | |
| Bai et al. | Novel construction of nanostructured carbon materials as sulfur hosts for advanced lithium‐sulfur batteries | |
| Liu et al. | A nanoporous nitrogen-doped graphene for high performance lithium sulfur batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210903 |