CN109149020B - Carbon nanotube-graphene-aramid conductive material, lithium air battery positive electrode material and lithium air battery - Google Patents
Carbon nanotube-graphene-aramid conductive material, lithium air battery positive electrode material and lithium air battery Download PDFInfo
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- CN109149020B CN109149020B CN201811051018.9A CN201811051018A CN109149020B CN 109149020 B CN109149020 B CN 109149020B CN 201811051018 A CN201811051018 A CN 201811051018A CN 109149020 B CN109149020 B CN 109149020B
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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
- H01M12/00—Hybrid cells; Manufacture thereof
- H01M12/08—Hybrid cells; Manufacture thereof composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type
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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
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9075—Catalytic material supported on carriers, e.g. powder carriers
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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
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/96—Carbon-based electrodes
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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
Abstract
The invention belongs to the technical field of electrochemical materials, and particularly relates to a carbon nanotube-graphene-aramid conductive material, a lithium air battery anode material and a lithium air battery. The carbon nanotube-graphene-aramid conductive material is prepared by preparing raw materials comprising a carbon nanotube, graphene, aramid fiber, a forming auxiliary agent, a fluffing agent, a dispersing agent and an alcohol solvent, and sequentially carrying out mixing, shearing, drying and rolling; the carbon nanotube-graphene-aramid conductive material has pores. The results of the examples show that the lithium air battery prepared by the material provided by the invention has the power of 0.5mA/cm2The specific capacity is more than 1100 mAh/g; at 9.65mA/cm2Under the condition of high discharge rate, the specific capacity is still over 600 mAh/g.
Description
Technical Field
The invention belongs to the technical field of electrochemical materials, and particularly relates to a carbon nanotube-graphene-aramid conductive material and a preparation method thereof, a lithium air battery positive electrode material and a preparation method thereof, and a lithium air battery.
Background
Lithium-air batteries, which use lithium as a negative electrode and oxygen in the air as a positive electrode reactant, have attracted much attention because of their higher energy density than lithium-ion batteries. However, the lithium air battery has many problems to be solved, such as moisture control. The lithium air battery uses oxygen in the air as a reactant and needs to work in an open system, and the air contains water, and once entering the lithium air battery, the air reacts with a negative electrode material to reduce the electrochemical performance of the lithium air battery, so that the lithium air battery has higher requirements on the performance of a positive electrode material.
At present, most lithium-air batteries use a composite material with catalytic activity supported by a carbon substrate as a positive electrode, such as a composite film formed by using a carbon nanotube substrate and then supporting precious metals such as Ru, Pt, Pd, Au, Rh, or Ag.
Disclosure of Invention
The invention aims to provide a carbon nanotube-graphene-aramid conductive material which has excellent conductive performance and can be used as a lithium air battery cathode material to obtain a lithium air battery with higher capacity.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a carbon nanotube-graphene-aramid conductive material which is prepared by sequentially mixing, shearing, drying and rolling raw materials comprising a carbon nanotube, graphene, aramid fiber, a defibering agent, a dispersing agent and a solvent;
the carbon nanotube-graphene-aramid conductive material has pores.
Preferably, the mass ratio of the carbon nanotubes to the graphene to the aramid fibers is (0.3-0.5): (0.1-0.3): 1.
preferably, the aramid fiber includes para-aramid chopped fiber and para-aramid pulp fiber.
Preferably, the mass ratio of the para-aramid chopped fibers to the para-aramid pulp fibers is 1: (0.8 to 1.5).
Preferably, the pore diameter of pores of the carbon nanotube-graphene-aramid conductive material is 2-120 nm; the thickness is 0.05-0.2 mm.
The invention also provides a preparation method of the carbon nanotube-graphene-aramid conductive material in the technical scheme, which comprises the following steps:
shearing a mixture comprising a carbon nanotube dispersion liquid, a graphene dispersion liquid and an aramid fiber dispersion liquid to obtain a mixed slurry;
and drying the mixed slurry and then rolling to obtain the carbon nano tube-graphene-aramid conductive material.
Preferably, the shearing speed is 1200-2000 r/min, and the shearing time is 30-60 min;
the rolling linear pressure is 15-30 kN/m.
The invention provides a lithium-air battery anode material which comprises a porous metal foil, a waterproof breathable film and a carbon nanotube-graphene-aramid conductive material which are sequentially laminated and compounded, or a carbon nanotube-graphene-aramid conductive material which is prepared by the preparation method in the technical scheme.
The invention provides a preparation method of the lithium-air battery anode material in the technical scheme, which comprises the steps of sequentially attaching the porous metal foil, the waterproof breathable film and the carbon nano tube-graphene-aramid fiber conductive material, and then pressing and compounding the materials.
The invention provides a lithium-air battery, which comprises an anode shell, an anode, a diaphragm, a cathode shell and electrolyte, wherein the anode is the anode material of the lithium-air battery in the technical scheme or the anode material of the lithium-air battery prepared by the preparation method in the technical scheme.
The carbon nanotube-graphene-aramid conductive material is prepared by preparing raw materials comprising a carbon nanotube, graphene, aramid fiber, a forming auxiliary agent, a fluffing agent, a dispersing agent and an alcohol solvent, and sequentially carrying out mixing, shearing, drying and rolling; the carbon nanotube-graphene-aramid conductive material has pores. According to the invention, aramid fiber is utilized to compound the carbon nano tube and the graphene into a whole, so that a material with a porous frame structure is obtained, and oxygen in the air can enter a reaction system; the graphene and the carbon nano tube are matched for use, so that the conductivity and the oxygen adsorption capacity of the material can be improved, and the transmission speed of electrons in a reaction system and the activity of the anode material are further improved. The results of the examples show that the lithium air battery prepared by the material provided by the invention has the power of 0.5mA/cm2The specific capacity is more than 1100 mAh/g; at 9.65mA/cm2Under the condition of high discharge rate, the specific capacity is still over 600 mAh/g.
Drawings
Fig. 1 is a schematic structural view of a lithium air battery provided in the present invention;
FIG. 2 is a graph showing the cycle comparison of the rate performance of the lithium-air battery obtained in example 1 at different discharge rates;
in the figure, 1 is a porous positive battery case, 2 is an air electrode, 21 is a porous metal foil, 22 is a waterproof breathable film, 23 is porous aramid conductive paper, 3 is an electrolyte, 4 is a diaphragm, 5 is a negative electrode, and 6 is a negative electrode case.
Detailed Description
The invention provides a carbon nanotube-graphene-aramid conductive material which is prepared by sequentially mixing, shearing, drying and rolling raw materials comprising a carbon nanotube, graphene, aramid fiber, a defibering agent, a dispersing agent and a solvent;
the carbon nanotube-graphene-aramid conductive material has pores.
The raw materials for preparing the carbon nanotube-graphene-aramid conductive material comprise carbon nanotubes, wherein the carbon nanotubes are preferably multiwalled carbon nanotubes, the diameter of the carbon nanotubes is preferably 30-150 nm, more preferably 40-125 nm, and further preferably 50-100 nm; the length of the carbon nanotube is preferably 3 to 10 μm, more preferably 5 to 9 μm, and further preferably 7 to 8 μm.
The preparation raw material of the carbon nanotube-graphene-aramid conductive material comprises graphene, wherein the purity of the graphene is preferably 98-99%; the number of layers of the graphene is preferably 3-10, and more preferably 3-5.
The preparation raw materials of the carbon nanotube-graphene-aramid conductive material provided by the invention comprise aramid fibers, wherein the aramid fibers preferably comprise para-aramid chopped fibers and para-aramid pulp fibers; the diameter of the para-aramid chopped fiber is preferably 10-14 μm, more preferably 11-13 μm, and further preferably 12 μm; the length is preferably 3 to 5mm, more preferably 3 to 4mm, and further preferably 4 mm. The length of the para-aramid pulp fiber is preferably 1.2-2 mm, more preferably 1.4-1.8 mm, and further preferably 1.5-1.6 mm.
In the present invention, the mass ratio of the para-aramid chopped fibers to the para-aramid pulp fibers is preferably 1: (0.8 to 1.5), more preferably 1: (0.9-1.2), and more preferably 1: 1.
in the invention, the mass ratio of the carbon nanotubes to the graphene to the aramid fibers is preferably (0.3-0.5): (0.1-0.3): 1, more preferably (0.4 to 0.5): (0.2-0.3): 1, and more preferably 0.5:0.3: 1.
The preparation raw materials of the carbon nanotube-graphene-aramid conductive material comprise a defibering agent, wherein the defibering agent comprises polyoxyethylene or sodium dodecyl sulfate (SDBS).
The raw materials for preparing the carbon nanotube-graphene-aramid conductive material comprise a dispersing agent, wherein the dispersing agent preferably comprises Sodium Dodecyl Sulfate (SDS) or polyvinylpyrrolidone (PVP).
The preparation raw materials of the carbon nanotube-graphene-aramid conductive material provided by the invention comprise a solvent, wherein the solvent preferably comprises water and alcohol; the water is preferably deionized water and the alcohol preferably comprises ethanol.
The carbon nanotube-graphene-aramid conductive material has pores, and the pore diameter of the pores is preferably 2-120 nm, more preferably 2-80 nm, and further preferably 2-50 nm; the specific surface area of the carbon nanotube-graphene-aramid conductive material is preferably 55-70 m2A concentration of 60 to 70m is more preferable2A concentration of 65 to 70m is further preferable2(ii) in terms of/g. The surface resistance of the carbon nanotube-graphene-aramid conductive material is preferably 10-30 omega/□, more preferably 10-20 omega/□, and further preferably 10-15 omega/□. The strength of the carbon nanotube-graphene-aramid conductive material is preferably 0.2-0.5 kg/mm2。
In the invention, the thickness of the carbon nanotube-graphene-aramid conductive material is preferably 0.05-0.2 mm, more preferably 0.05-0.15 mm, and still more preferably 0.08-0.1 mm.
The invention provides a preparation method of the carbon nanotube-graphene-aramid conductive material in the technical scheme, which comprises the following steps:
shearing a mixture comprising a carbon nanotube dispersion liquid, a graphene dispersion liquid and an aramid fiber dispersion liquid to obtain a mixed slurry;
and drying the mixed slurry and then rolling to obtain the carbon nano tube-graphene-aramid conductive material.
The method comprises the step of shearing a mixture comprising a carbon nanotube dispersion liquid, a graphene dispersion liquid and an aramid fiber dispersion liquid to obtain a mixed slurry. In the present invention, the carbon nanotube dispersion preferably includes carbon nanotubes, a dispersant and ethanol; the dispersant preferably comprises Sodium Dodecyl Sulfate (SDS). The mass ratio of the carbon nanotubes to the dispersing agent to the ethanol is preferably 1: (0.01-0.05): (300-400), more preferably 1: (0.01-0.04): (320-375), and more preferably 1: (0.02-0.04): (325 to 350). The preparation method of the carbon nano tube dispersion liquid has no special requirements, and the components are preferably mixed and then uniformly dispersed by ultrasonic.
In the present invention, the graphene dispersion preferably includes graphene, a dispersant and ethanol, and the mass ratio of the graphene, the dispersant and the ethanol is preferably 1: (0.01-0.05): (300-400), more preferably 1: (0.01-0.04): (320-375), and more preferably 1: (0.02-0.04): (325 to 350). The preparation method of the graphene dispersion liquid has no special requirements, and the graphene dispersion liquid is prepared by preferably mixing the components and then performing ultrasonic homogenization.
In the present invention, the aramid fiber dispersion liquid preferably includes aramid fibers, a defibering agent, and water, and the mass ratio of the aramid fibers, the defibering agent, and the water is preferably 1: (0.005-0.01): (200-300), more preferably 1: (0.006-0.009): (220-275), and more preferably 1: (0.007-0.008): (235-265).
In the present invention, the aramid fiber preferably includes a para-aramid chopped fiber and a para-aramid pulp fiber; the fluffing agent corresponding to the para-aramid chopped fibers is preferably sodium dodecyl sulfate, and the fluffing agent corresponding to the para-aramid pulp fibers is preferably polyethylene oxide.
In the present invention, the preparation method of the aramid fiber dispersion preferably includes:
mixing the para-aramid chopped fibers with water, and then adding sodium dodecyl sulfate into the mixed material for defibering to obtain the para-aramid chopped fiber dispersion liquid. In the invention, the defibering temperature is preferably 40-60 ℃, more preferably 45-55 ℃, and further preferably 48-52 ℃; the time for defibering is preferably 15-30 min, more preferably 17-28 min, and still more preferably 20-25 min.
Mixing the para-aramid pulp fiber with water, adding polyoxyethylene into the mixed material, and performing defibering to obtain the para-aramid pulp fiber dispersion liquid. In the invention, the defibering temperature of the para-aramid pulp fiber is preferably 40-60 ℃, more preferably 45-55 ℃, and further preferably 48-52 ℃; the time for defibering is preferably 15-30 min, more preferably 17-28 min, and still more preferably 20-25 min.
And mixing the obtained para-aramid chopped fiber dispersion liquid with para-aramid pulp fiber dispersion liquid to obtain aramid fiber dispersion liquid. The invention preferably uses the para-aramid chopped fiber and the para-aramid pulp fiber in a matching way, and can improve the strength and the toughness of the conductive material.
After the carbon nanotube dispersion liquid, the graphene dispersion liquid and the aramid fiber dispersion liquid are obtained, the carbon nanotube dispersion liquid, the graphene dispersion liquid and the aramid fiber dispersion liquid are mixed, and then the obtained mixture is sheared to obtain mixed slurry. In the invention, the shearing rate is preferably 1200-2000 r/min, more preferably 1500-1800 r/min, and still more preferably 1600-1700 r/min; the shearing time is preferably 30-60 min, more preferably 35-55 min, and still more preferably 40-50 min.
After a mixture is obtained, the mixed slurry is dried, the drying mode is preferably vacuum freeze drying, and the drying temperature is preferably-15 to-30 ℃, and more preferably-18 to-25 ℃; the drying time is preferably 12-20 hours, and more preferably 15-18 hours.
After drying, the dried material is rolled to obtain the carbon nano tube-graphene-aramid conductive material. In the invention, the rolling linear pressure is preferably 15-30 kN/m, more preferably 17-28 kN/m, and still more preferably 20-25 kN/m. The rolling frequency is preferably 3 to 5 times, and more preferably 4 to 5 times.
The invention also provides a lithium-air battery anode material which comprises the porous metal foil, the waterproof breathable film and the carbon nanotube-graphene-aramid conductive material which are sequentially laminated and compounded, or the carbon nanotube-graphene-aramid conductive material which is prepared by the preparation method in the technical scheme.
The lithium-air battery positive electrode material comprises a porous metal foil, a waterproof breathable film and a carbon nano tube-graphene-aramid conductive material which are sequentially laminated and compounded. The porous metal foil is preferably made of copper or aluminum; the thickness of the porous metal foil is preferably 15-30 μm, more preferably 17-27 μm, and further preferably 20-25 μm; the aperture of the hole in the porous metal foil is preferably 50-100 μm, more preferably 60-90 μm, and further preferably 70-80 μm; the distance between two adjacent holes is preferably 150-200 μm, more preferably 160-190 μm, and still more preferably 170-180 μm.
In the present invention, the waterproof breathable film is preferably a Polyethylene (PE) polymeric breathable film, which is a commercially available product well known to those skilled in the art.
According to the invention, the porous metal foil, the waterproof breathable film and the carbon nanotube-graphene-aramid fiber conductive material are sequentially laminated and compounded, and the porous metal foil is used as a current collector, so that the positive electrode electron transmission and collection are easy; the waterproof breathable film can prevent moisture in the air from entering a battery system, protect a negative lithium plate, prevent an electrolyte from overflowing and improve the safety of the lithium-air battery; the carbon nanotube-graphene-aramid conductive fiber has a porous structure and good strength and toughness, and is used as a carrier and a catalyst of a reaction active substance of a lithium air battery anode material, so that the lithium air battery has excellent electrochemical performance.
The invention also provides a preparation method of the lithium-air battery anode material, which comprises the steps of sequentially attaching the porous metal foil, the waterproof breathable film and the carbon nano tube-graphene-aramid fiber conductive material, and then pressing and compounding the materials.
The invention has no special requirements on the bonding mode of the porous metal foil, the waterproof breathable film and the carbon nano tube-graphene-aramid fiber conductive material, and can be used for tightly bonding the three materials. In the invention, the pressure during pressing is preferably 0.1-0.5 MPa, more preferably 0.1-0.3 MPa, and still more preferably 0.15-0.3 MPa; the pressing time is preferably 2-10 min, more preferably 3-8 min, and still more preferably 4-5 min. The pressing according to the invention is preferably carried out at room temperature.
The invention also provides a lithium-air battery, which comprises an anode shell, an anode, a diaphragm, a cathode shell and electrolyte, wherein the anode is the lithium-air battery anode material prepared by the technical scheme or the lithium-air battery anode material prepared by the preparation method of the technical scheme.
As shown in fig. 1, the lithium-air battery provided by the invention comprises a positive electrode shell 1, a positive electrode 2, a diaphragm 4, a negative electrode 5, a negative electrode shell 6 and an electrolyte 3; the anode 2 comprises a porous metal foil 21, a waterproof breathable film 22 and a carbon nanotube-graphene-aramid conductive material 23.
In the present invention, the positive electrode can is preferably a porous positive electrode can; the electrolyte preferably comprises LiPF6(ii) a The negative electrode preferably comprises a lithium sheet; the membrane preferably comprises a polypropylene membrane.
The method for assembling the lithium-air battery has no special requirement, and the lithium-air battery is preferably assembled by sequentially assembling the positive electrode shell, the positive electrode (namely, the air electrode), the diaphragm, the negative electrode and the negative electrode shell.
In the above embodiments, the reagents used are all commercially available products well known to those skilled in the art.
For further explanation of the present invention, the following detailed descriptions of the carbon nanotube-graphene-aramid conductive material, the lithium air battery positive electrode material and the lithium air battery provided by the present invention are provided with reference to the drawings and examples, which should not be construed as limiting the scope of the present invention.
Example 1
Weighing 0.5g of aramid chopped fiber and 0.005g of sodium dodecyl sulfate, placing the aramid chopped fiber and the sodium dodecyl sulfate in a beaker, adding 240g of warm water with the temperature of 45 ℃, standing and soaking for 20min, filtering and cleaning for a plurality of times, and pulping by a pulping machine for later use;
weighing 0.5g of aramid pulp fiber and 0.005g of polyethylene oxide, placing the aramid pulp fiber and the polyethylene oxide in a beaker, adding 240g of warm water (40 ℃), standing and soaking for 20min, and pulping by a pulping machine for later use;
respectively weighing 0.5g of carbon nano tube and 0.3g of graphene, placing the carbon nano tube and the graphene in a beaker, uniformly dispersing the carbon nano tube and the graphene in 350g of ethanol, uniformly mixing the aramid chopped fiber dispersion liquid and the aramid pulp fiber dispersion liquid through a stainless steel fluid mixer, and shearing the mixture through a high-speed shearing machine to prepare mixed slurry.
And (3) freeze-drying the mixed slurry by a freeze dryer, and rolling and forming to prepare the carbon nanotube-graphene-aramid conductive material.
According to the schematic diagram shown in fig. 1, a porous metal foil, a waterproof breathable film and a carbon nanotube-graphene-aramid conductive material are sequentially laminated and then pressed into a lithium air battery anode material.
With LiPF6The aramid fiber porous conductive paper lithium air battery is formed by assembling a porous positive battery shell, an air electrode, a diaphragm, a negative electrode and a negative electrode shell in sequence.
Examples 2 to 3
The carbon nanotube-graphene-aramid conductive material, the lithium air battery positive electrode material and the lithium air battery were prepared according to the method of example 1, except for the amount of raw materials and process parameters, which are specifically listed in table 1.
TABLE 1 EXAMPLES 1-3 raw material usage and Process parameters
Characterization and results of Performance
The surface resistance of the carbon nanotube-graphene-aramid conductive material obtained in example 1-3 was measured by using a four-probe resistance meter, the specific surface area and the pore diameter of the carbon nanotube-graphene-aramid conductive material were measured by using a specific surface area analyzer, the tensile strength of the material was measured by using a method of hanging weights under a unit cross-sectional area, and the test results are listed in table 2;
table 2 structure and performance parameters of the carbon nanotube-graphene-aramid conductive material obtained in examples 1 to 3
The test results in table 2 show that the carbon nanotube-graphene-aramid conductive material provided by the invention has better strength performance and electrical conductivity, and is favorable for improving the stability of the electrochemical performance and the electron transmission rate of a lithium air battery when being used as a positive electrode material of the lithium air battery; the carbon nanotube-graphene-aramid conductive material has a pore structure and excellent conductivity, and can provide good oxygen adsorption capacity and oxygen reduction activity, so that the capacity, the multiplying power and the cycle performance of the battery are improved.
Specific capacity of the lithium-air battery obtained in example 1-3 was tested under different discharge rate conditions to examine the cycle rate performance of the battery, wherein the discharge rate and the specific capacity were calculated based on the area and mass of the air electrode, and the test results are shown in fig. 2 and table 3. As can be seen from fig. 2, the lithium-air battery obtained in example 1 has a high specific capacity and excellent rate performance. The test results for examples 2 and 3 are similar to example 1, and the specific test results are listed in table 3.
TABLE 3 results of rate cycle test of lithium-air batteries obtained in examples 1 to 3
The test results in table 3 show that the lithium air battery provided by the invention has higher specific capacity. And under different discharge multiplying power, the specific capacity retention rate of the battery is higher, and when the discharge multiplying power is 9.6mA/cm2In the process, after the charge and discharge are cycled for 10 times, the specific capacity retention rate is still 94%, and good multiplying power and cycle performance are shown.
According to the embodiment, the carbon nanotube-graphene-aramid conductive material is used as the carrier and the catalyst of the reaction active substance, and the porous frame structure, the good strength and the good toughness of the carbon nanotube-graphene-aramid conductive material can greatly improve the performance of the lithium air battery; the combination of the porous metal foil with the functions of transmitting and collecting electrons and the waterproof and breathable film improves the comprehensive performance of the anode material of the lithium-air battery, and the lithium-air battery prepared by using the anode material has excellent rate performance.
The scheme provided by the invention has the advantages of wide raw material source, simple and easily-controlled preparation method, low cost and suitability for popularization and application.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (5)
1. A lithium-air battery anode material comprises a porous metal foil, a waterproof breathable film and a carbon nano tube-graphene-aramid conductive material which are sequentially laminated and compounded;
the carbon nanotube-graphene-aramid conductive material is prepared by sequentially mixing, shearing, drying and rolling preparation raw materials consisting of a carbon nanotube, graphene, aramid fibers, a defibering agent, a dispersing agent and a solvent;
the carbon nano tube-graphene-aramid conductive material is provided with pores;
the pore diameter of the pores of the carbon nanotube-graphene-aramid conductive material is 2-120 nm; the thickness is 0.05-0.2 mm;
the mass ratio of the carbon nano tube to the graphene to the aramid fiber is (0.3-0.5): (0.1-0.3): 1;
the aramid fiber comprises para-aramid chopped fiber and para-aramid pulp fiber;
the mass ratio of the para-aramid chopped fibers to the para-aramid pulp fibers is 1: (0.8 to 1.5).
2. The positive electrode material for the lithium-air battery as claimed in claim 1, wherein the preparation method of the carbon nanotube-graphene-aramid conductive material comprises the following steps:
shearing a mixture comprising a carbon nanotube dispersion liquid, a graphene dispersion liquid and an aramid fiber dispersion liquid to obtain a mixed slurry;
and drying the mixed slurry and then rolling to obtain the carbon nano tube-graphene-aramid conductive material.
3. The positive electrode material for a lithium-air battery according to claim 1, wherein the shearing speed is 1200 to 2000r/min, and the shearing time is 30 to 60 min;
the rolling linear pressure is 15-30 kN/m.
4. The method for preparing the positive electrode material of the lithium-air battery of claim 1, which comprises the steps of sequentially laminating the porous metal foil, the waterproof breathable film and the carbon nanotube-graphene-aramid conductive material, and then pressing and compounding the materials.
5. A lithium-air battery comprises a positive electrode shell, a positive electrode, a diaphragm, a negative electrode shell and electrolyte, and is characterized in that the positive electrode is the lithium-air battery positive electrode material according to any one of claims 1 to 3 or the lithium-air battery positive electrode material prepared by the preparation method according to claim 4.
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