CN111969188A - Low-temperature graphene/graphite fluoride cathode material - Google Patents
Low-temperature graphene/graphite fluoride cathode material Download PDFInfo
- Publication number
- CN111969188A CN111969188A CN202010843178.8A CN202010843178A CN111969188A CN 111969188 A CN111969188 A CN 111969188A CN 202010843178 A CN202010843178 A CN 202010843178A CN 111969188 A CN111969188 A CN 111969188A
- Authority
- CN
- China
- Prior art keywords
- graphite fluoride
- graphene
- temperature
- low
- graphene oxide
- 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.)
- Granted
Links
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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
-
- 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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/5835—Comprising fluorine or fluoride salts
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to the technical field of chemical power sources, in particular to a low-temperature graphene/graphite fluoride positive electrode material, which is prepared by taking graphene oxide and graphite fluoride as raw materials and ethanol as a solvent to prepare a mixture, and performing instant thermal reduction reaction in the air to coat the graphene oxide in a graphite fluoride material interval to prepare the graphene/graphite fluoride positive electrode material.
Description
Technical Field
The invention relates to the technical field of chemical power supplies, in particular to a low-temperature graphene/graphite fluoride positive electrode material.
Background
Lithium primary batteries, as a high specific energy battery for each single use, have become a research hotspot at present due to a series of advantages such as high working voltage, high specific energy, long storage life, and the like. Wherein, the lithium carbon fluoride battery is used as a primary battery with the highest specific energy in the current practical application, and the specific energy reaches 2180 Wh/kg. Meanwhile, the structure of the graphite fluoride material enables the graphite fluoride material to have stable physical and chemical properties, so that the storage performance and the high-temperature performance of the battery are good.
However, it is limited by its own structure of the fluorocarbon positive electrode material, and its electron conductivity is low (10)-9More than S/cm), and the diffusion rate of lithium ions is slow at low temperature, and the low-temperature internal resistance is increased, so that the low-temperature discharge performance of the lithium-carbon fluoride battery is poor, and the use of the lithium/carbon fluoride battery in a low-temperature environment is severely restricted.
Therefore, the problem to be solved at present is to find a carbon fluoride material with good performance at low temperature, to improve the low-temperature performance of the lithium fluorocarbon battery, and to widen the application range of the lithium fluorocarbon battery.
Patent number CN201910103600.3 discloses a V2O5The @ C modified carbon fluoride cathode material improves the carbon fluoride voltage hysteresis phenomenon and greatly improves the rate capability.
Patent No. CN201910104098.8 discloses V2O5A carbon fluoride mixed positive electrode material which improves the problem of voltage hysteresis at the initial stage of discharge of the carbon fluoride positive electrode material and the problem of large heat generation under a large current discharge condition.
Patent No. CN201811348641.0 discloses a composite carbon fluoride positive electrode material for lithium primary batteries, which discloses that porous carbon fluoride is a carbon skeleton source, and the porous structure thereof provides a lithium ion diffusion channel during the discharge process, thereby increasing the discharge voltage and eliminating the voltage hysteresis, and the composite carbon fluoride positive electrode material has no voltage hysteresis, high specific energy and controllable discharge performance.
Patent No. CN201711272530.1 discloses a chemical reduction method modified fluorocarbon positive electrode material, which improves the initial discharge voltage hysteresis and rate discharge performance of a lithium fluorocarbon battery.
Patent No. CN201710621698.2 discloses an asphalt carbon-coated carbon fluoride positive electrode material, which improves the interface bonding force between coated carbon and carbon fluoride, improves the carbon coating effect on the surface of carbon fluoride, and overcomes the common problem of replacing the specific capacity of carbon fluoride with high rate performance.
Patent No. cn201510641793.x discloses a polypyrrole-coated carbon fluoride positive electrode material, which uniformly coats polypyrrole on the surface of carbon fluoride particles to form a dense and stable polypyrrole film on the surface of the carbon fluoride particles, so that the conductivity of the material is improved.
Patent No. CN201810940983.5 discloses a method for preparing a carbon fluoride material at low temperature, and also discloses that the carbon fluoride material prepared by the method has a strong application prospect in various fields such as anti-corrosion and anti-pollution paint, lithium batteries, super capacitors, solid lubrication, adsorbents, conductive additives and the like.
Although the prior art improves the discharge performance of the fluorocarbon anode material by means of improving the structure, surface modification and the like, the above documents all focus on improving the rate performance at normal temperature and the voltage hysteresis phenomenon at the initial stage of discharge. At present, related researches on the improvement of low-temperature performance of the lithium fluorocarbon battery are less, and particularly, the research is not reported in the aspect of low-temperature type fluorocarbon cathode materials.
Therefore, it is urgent to find a carbon fluoride material which can improve the low-temperature performance of a battery and also has excellent normal-temperature discharge performance, and to improve the low-temperature discharge performance of the battery.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a low-temperature graphene/graphite fluoride positive electrode material.
The method is realized by the following technical scheme:
a low-temperature graphene/graphite fluoride positive electrode material is prepared by taking graphene oxide and graphite fluoride as raw materials and ethanol as a solvent to prepare a mixture, and coating the graphene oxide in a graphite fluoride material interval through an instant thermal reduction reaction in the air to prepare the graphene/graphite fluoride positive electrode material.
A low-temperature graphene/graphite fluoride composite material comprises the following steps:
(1) adding graphene oxide into ethanol, and dispersing for 10-50 min by using ultrasonic waves to obtain a graphene oxide dispersion liquid;
(2) adding graphite fluoride into the graphene oxide dispersion liquid, and performing magnetic stirring to obtain a graphene oxide/graphite fluoride mixed solution;
(3) blowing and drying the mixed solution prepared in the step (2) to obtain a graphene oxide/graphite fluoride mixed material;
(4) and (4) carrying out thermal reduction on the graphene oxide/graphite fluoride mixture prepared in the step (3) in an air atmosphere, and then naturally cooling and grinding to obtain the graphene/graphite fluoride anode material.
Preferably, the ethanol is absolute ethanol.
Preferably, the mass ratio of the graphene oxide to the graphite fluoride in the graphene oxide/graphite fluoride mixed solution is (1-3): 10.
Preferably, the ratio of the graphene oxide to the ethanol in the graphene oxide dispersion liquid is 1: 10-1: 50.
Preferably, the rotation speed of the magnetic stirring is 350-500r/min, and the time is 30-90 min.
Preferably, the air is used for drying, and the temperature is 45-55 ℃; further preferably 50 ℃.
Preferably, the thermal reduction is carried out at the temperature of 300-400 ℃ for 1-30 min.
The invention relates to a low-temperature graphene/graphite fluoride cathode material, which is prepared by wrapping graphene oxide in a graphite fluoride material interval by an instantaneous thermal reduction method, so that the low-temperature conductivity of the cathode material is improved, the internal resistance of a battery material is reduced, the low-temperature lithium ion diffusivity of the graphite fluoride material is improved, and the low-temperature discharge performance of a lithium-carbon fluoride battery can be effectively improved.
Has the advantages that:
(1) this application utilizes high temperature in the twinkling of an eye to reduce graphite oxide into graphite alkene, and temperature control is below 400 ℃, can reduce graphite oxide into graphite alkene in the twinkling of an eye, can not cause the destruction to the structure of fluoridizing the graphite material again. The generated graphene is distributed on the surface and among particles of the graphite fluoride material, and the high conductivity of the graphene is utilized to improve the conductivity of the graphite fluoride material at low temperature (the conductivity of the graphite fluoride is 10)-9More than S/cm, the conductivity of the graphene/graphite fluoride reaches 10-4More than S/cm), so that the internal resistance and the polarization phenomenon of the lithium-carbon fluoride battery are reduced when the lithium-carbon fluoride battery is discharged, and the discharge performance of the battery at low temperature is optimized.
(2) This application uses absolute ethyl alcohol as the solvent, and graphite fluoride dispersion that will have the hydrophobicity well has further increased two kinds of material contact homogeneity in graphite oxide solution, and the graphite alkene is better with graphite fluoride's contact nature in the graphite alkene/graphite fluoride combined material of preparation simultaneously utilizing the stirring, more is favorable to the electric conductivity promotion of material and the diffusion of lithium ion under the low temperature.
(3) The graphene/graphite fluoride material prepared by the method is different from common carbon cladding, metal oxide cladding doping such as manganese dioxide and the like, conductive polymer cladding and the like in that the method mainly improves the conductivity of the material, so that the rate capability of a battery is improved. In the application, the existence of the graphene can improve the lithium ion diffusion rate of the electrode material while improving the conductivity, and the lithium ion diffusion rate of the graphite fluoride is about 3 multiplied by 10-14cm2(s) the lithium ion diffusion rate of graphene/graphite fluoride is 1X 10-13cm2The improvement is nearly 10 times per second. Particularly, the viscosity of the electrolyte is increased at low temperature, the influence of the diffusion rate of lithium ions in the positive electrode on the low-temperature performance of the battery is further increased, the low-temperature performance is seriously influenced, and the graphene provides a channel for the migration and diffusion of the lithium ions, so that the low-temperature performance of the lithium fluorocarbon battery is further improved.
(4) The graphene/graphite fluoride positive electrode material prepared by the method is applied to the lithium fluorocarbon battery, so that the low-temperature discharge performance of the lithium fluorocarbon battery can be effectively improved, the gram specific capacity of the graphite fluoride material is almost changed at 0.1C multiplying power at room temperature, but the low-wave voltage of the battery is improved from 2.79V to 3.00V, and the platform voltage is increased from 2.94V to 3.01V; the specific gram capacity of the material is increased from 291mAh/g to 450mAh/g at the temperature of minus 20 ℃ and the multiplying power of 0.1C, the low-wave voltage is increased from 1.99V to 2.36V, and the platform voltage is increased from 2.21V to 2.52V; the specific gram capacity of the material is increased from 105mAh/g to 167mAh/g at the temperature of minus 40 ℃ and the multiplying power of 0.1C, the low-wave voltage is increased from 1.75V to 2.02V, and the platform voltage is increased from 2.08V to 2.22V. The low-temperature discharge performance of the carbon fluoride material is greatly improved.
Drawings
Fig. 1 is an XRD contrast pattern of the graphene/graphite fluoride cathode material prepared in example 1 and a pure carbon fluoride material, graphene material;
fig. 2 is an SEM image of the graphene/graphite fluoride cathode material prepared in example 1;
fig. 3 is an EIS curve of the graphene/graphite fluoride cathode material prepared in example 1 and a pure carbon fluoride material;
fig. 4 is a discharge curve of a battery prepared by applying the graphene/graphite fluoride cathode material in example 1 and a battery prepared by using a pure carbon fluoride material at room temperature;
FIG. 5 is a discharge curve at-20 ℃ of a battery prepared from the graphene/graphite fluoride positive electrode material and a battery prepared from a pure carbon fluoride material in application example 2;
fig. 6 is a discharge curve at-40 ℃ of a battery prepared from the graphene/graphite fluoride positive electrode material and a battery prepared from a pure carbon fluoride material in application example 3.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
A low-temperature graphene/graphite fluoride cathode material is prepared by the following method:
(1) adding 1g of graphene oxide into 20ml of absolute ethyl alcohol, and dispersing for 30min by using ultrasonic waves to obtain a graphene oxide dispersion liquid;
(2) magnetically stirring at the rotating speed of 350r/min, adding 10g of graphite fluoride into the graphene oxide dispersion liquid, and continuously stirring for 30min to obtain a graphene oxide/graphite fluoride mixed solution;
(3) blowing and drying the mixed solution prepared in the step (2) at 50 ℃ to obtain a graphene oxide/graphite fluoride mixed material;
(4) placing the graphene oxide/graphite fluoride mixture prepared in the step (3) at 300 ℃ in an air atmosphere for thermal reduction for 1min, and then naturally cooling and grinding to obtain a graphene/graphite fluoride positive electrode material;
fig. 1 is an XRD contrast spectrum of the graphene/graphite fluoride cathode material prepared in this example, the pure carbon fluoride material and the graphene material, from which: the X-ray diffraction pattern of the graphene/graphite fluoride anode material of the embodiment is the same as the X-ray diffraction pattern of graphite fluoride, has the characteristic peak characteristics of graphite fluoride, and has the characteristic peak characteristics of weak graphene, but is not significant, which indicates that the graphene/graphite fluoride anode material is formed, and the structures of the graphene material and the graphite fluoride material are changed, so that the output of the electrochemical performance of the material is not influenced;
fig. 2 is an SEM image of the graphene/graphite fluoride cathode material prepared in this embodiment, which shows that: the graphene/graphite fluoride positive electrode material has flaky and spheroidal substances, which may be caused by the fact that the graphene oxide is reduced to change the structure of the graphene, and the result of electron microscope scanning shows that the method successfully forms the mutual compounding of the graphene and the graphite fluoride, and the graphene is distributed among graphite fluoride particles and coated on the surface of the material, so that the conductivity of the material and the diffusion of lithium ions can be effectively improved;
fig. 3 is an EIS curve of the graphene/graphite fluoride cathode material prepared in example 1 and a pure carbon fluoride material, and it can be seen from the figure that: the radius of the arc part of the curve in the high-frequency region represents the charge transfer impedance RCT, the diameters of the semicircular arcs of the graphite fluoride and the graphene/graphite fluoride anode material in the high-frequency region are 97 and 27.2 respectively, the charge transfer resistance value of the graphene/graphite fluoride material is about 27.2 omega, and the reduction of the charge transfer resistance value is very obvious compared with that of pure graphite fluoride. This shows that the graphene/graphite fluoride material electrode has small interface charge transfer resistance, good conductivity, small reaction resistance as a positive electrode material, improved conductivity of the whole battery system, and relatively easy electrode reaction. The diffusion coefficient of lithium ions in the electrode material helps to understand the electrochemical reaction kinetics and the reaction rate. Therefore, the lithium ion diffusion coefficient of the material is calculated by using a complex plane diagram method,
example 2
A low-temperature graphene/graphite fluoride cathode material is prepared by the following method:
(1) adding 3g of graphene oxide into 20ml of absolute ethyl alcohol, and dispersing for 30min by using ultrasonic waves to obtain a graphene oxide dispersion liquid;
(2) magnetically stirring at the rotating speed of 350r/min, adding 10g of graphite fluoride into the graphene oxide dispersion liquid, and continuously stirring for 90min to obtain a graphene oxide/graphite fluoride mixed solution;
(3) blowing and drying the mixed solution prepared in the step (2) at 50 ℃ to obtain a graphene oxide/graphite fluoride mixed material;
(4) and (4) placing the graphene oxide/graphite fluoride mixture prepared in the step (3) at 350 ℃ in an air atmosphere for thermal reduction for 30min, and then naturally cooling and grinding to obtain the graphene/graphite fluoride anode material.
Example 3
A low-temperature graphene/graphite fluoride cathode material is prepared by the following method:
(1) adding 3g of graphene oxide into 20ml of absolute ethyl alcohol, and dispersing for 30min by using ultrasonic waves to obtain a graphene oxide dispersion liquid;
(2) magnetically stirring at the rotating speed of 350r/min, adding 10g of graphite fluoride into the graphene oxide dispersion liquid, and continuously stirring for 90min to obtain a graphene oxide/graphite fluoride mixed solution;
(3) blowing and drying the mixed solution prepared in the step (2) at 50 ℃ to obtain a graphene oxide/graphite fluoride mixed material;
(4) and (4) placing the graphene oxide/graphite fluoride mixture prepared in the step (3) at the temperature of 400 ℃ in the air atmosphere for thermal reduction for 30min, and then naturally cooling and grinding to obtain the graphene/graphite fluoride anode material.
Application example 1
The graphene/graphite fluoride positive electrode material prepared in example 1 is used as a positive electrode material, the positive electrode material is added into a mixed solution of deionized water and sodium carboxymethyl cellulose, carbon nanotubes, superconducting carbon black and styrene-butadiene latex are sequentially added and stirred to prepare a slurry, wherein the mass ratio of the graphite fluoride material to the sodium carboxymethyl cellulose to the carbon nanotubes to the superconducting carbon black to the styrene-butadiene latex is 85: 2.5: 2: 3: and 5, uniformly coating the prepared slurry on an aluminum foil current collector, drying at 80 ℃ to obtain a positive plate, assembling the positive plate and a metal lithium plate in a matching manner to form the lithium fluorocarbon battery, wherein the electrolytic liquid is 1mol/L LiBF4/EC, DMC, EMC. Graphite fluoride is used as a positive electrode material, and another group of lithium fluorocarbon batteries are assembled by using the same formula and equipment. Two groups of batteries are discharged at room temperature at 0.1C, the discharge curve is shown in figure 4, the gram specific capacity output of a pure fluorinated graphite material is 723mAh/g, the graphene/fluorinated graphite material is 694mAh/g, due to the addition of graphene, the amount of a fluorinated graphite active substance in a positive electrode material is reduced, so that the gram specific capacity of the battery at room temperature is reduced, but the low-wave voltage of the battery is increased from 2.79V to 3.00V, and the platform voltage is increased from 2.94V to 3.01V, which shows that the generated graphene is distributed on the surface and among particles of the fluorinated graphite material, so that the conductivity of the fluorinated graphite material can be improved, the internal resistance of the lithium-carbon fluoride battery is reduced, the polarization phenomenon is reduced, the initial discharge voltage hysteresis phenomenon of the battery is improved, and the discharge platform voltage of the battery is improved.
Application example 2
The graphene/graphite fluoride positive electrode material prepared in example 2 is used as a positive electrode material, the positive electrode material is added into a mixed solution of deionized water and sodium carboxymethyl cellulose, carbon nanotubes, superconducting carbon black and styrene-butadiene latex are sequentially added and stirred to prepare a slurry, wherein the mass ratio of the graphite fluoride material to the sodium carboxymethyl cellulose to the carbon nanotubes to the superconducting carbon black to the styrene-butadiene latex is 85: 2.5: 2: 3: and 5, uniformly coating the prepared slurry on an aluminum foil current collector, drying at 80 ℃ to obtain a positive plate, assembling the positive plate and a metal lithium plate in a matching manner to form the lithium fluorocarbon battery, wherein the electrolytic liquid is 1mol/L LiBF4/EC, DMC, EMC. Graphite fluoride is used as a positive electrode material, and another group of lithium fluorocarbon batteries are assembled by using the same formula and equipment. Two groups of batteries are discharged at the temperature of minus 20 ℃ by 0.1C, the discharge curve is shown in figure 4, the gram specific capacity output of the pure graphite fluoride material is 291mAh/g, the graphene/graphite fluoride material reaches 450mAh/g, and compared with the normal temperature, the capacity output reduction amplitude of the graphene/graphite fluoride material at the low temperature is obviously reduced, which shows that the low-temperature capacity retention rate of the material is better. The low-wave voltage of the battery is increased from 1.99V to 2.36V, and the platform voltage is increased from 2.21V to 2.52V, which shows that the generated graphene is distributed on the surface and among particles of the graphite fluoride material, so that the conductivity of the graphite fluoride material at low temperature can be improved, the internal resistance of the lithium-carbon fluoride battery is reduced during discharging, the polarization phenomenon is reduced, and the discharging performance of the battery at low temperature is optimized; meanwhile, the diffusion rate of lithium ions in the electrode material at low temperature can be increased, and a channel is provided for migration and diffusion of the lithium ions, so that the low-temperature performance of the lithium fluorocarbon battery is further improved.
Application example 3
The graphene/graphite fluoride positive electrode material prepared in example 3 is used as a positive electrode material, the positive electrode material is added into a mixed solution of deionized water and sodium carboxymethyl cellulose, carbon nanotubes, superconducting carbon black and styrene-butadiene latex are sequentially added and stirred to prepare a slurry, wherein the mass ratio of the graphite fluoride material to the sodium carboxymethyl cellulose to the carbon nanotubes to the superconducting carbon black to the styrene-butadiene latex is 85: 2.5: 2: 3: and 5, uniformly coating the prepared slurry on an aluminum foil current collector, drying at 80 ℃ to obtain a positive plate, assembling the positive plate and a metal lithium plate in a matching manner to form the lithium fluorocarbon battery, wherein the electrolytic liquid is 1mol/L LiBF4/EC, DMC, EMC. Graphite fluoride is used as a positive electrode material, and another group of lithium fluorocarbon batteries are assembled by using the same formula and equipment. Discharging two groups of batteries at-40 ℃ by 0.1C, wherein a discharge curve is shown in figure 5, the gram specific capacity output of a pure fluorinated graphite material is 105mAh/g, the graphene/fluorinated graphite material reaches 167mAh/g, the low-wave voltage is increased from 1.75V to 2.02V, and the platform voltage is increased from 2.08V to 2.22V, so that the generated graphene is distributed on the surface and among particles of the fluorinated graphite material, the conductivity of the fluorinated graphite material at low temperature can be improved, the internal resistance is reduced, the polarization phenomenon is reduced when the lithium fluorinated carbon battery is discharged, and the discharge performance of the battery at low temperature is optimized; meanwhile, the diffusion rate of lithium ions in the electrode material at low temperature can be increased, and a channel is provided for migration and diffusion of the lithium ions, so that the low-temperature performance of the lithium fluorocarbon battery is further improved.
Claims (9)
1. The low-temperature graphene/graphite fluoride cathode material is characterized in that graphene oxide and graphite fluoride are used as raw materials, ethanol is used as a solvent to prepare a mixture, and the graphene oxide is coated in a graphite fluoride material interval through an instant thermal reduction reaction in the air to prepare the graphene/graphite fluoride cathode material.
2. The low-temperature graphene/graphite fluoride composite material of claim 1, comprising the steps of:
(1) adding graphene oxide into ethanol, and dispersing for 10-50 min by using ultrasonic waves to obtain a graphene oxide dispersion liquid;
(2) adding graphite fluoride into the graphene oxide dispersion liquid, and performing magnetic stirring to obtain a graphene oxide/graphite fluoride mixed solution;
(3) blowing and drying the mixed solution prepared in the step (2) to obtain a graphene oxide/graphite fluoride mixed material;
(4) and (4) carrying out thermal reduction on the graphene oxide/graphite fluoride mixture prepared in the step (3) in an air atmosphere, and then naturally cooling and grinding to obtain the graphene/graphite fluoride anode material.
3. The low-temperature graphene/graphite fluoride composite material according to claim 1, wherein the ethanol is absolute ethanol.
4. The low-temperature graphene/graphite fluoride composite material as claimed in claim 1, wherein the mass ratio of the graphene oxide to the graphite fluoride in the graphene oxide/graphite fluoride mixed solution is (1-3): 10.
5. The low-temperature graphene/graphite fluoride composite material as claimed in claim 1, wherein the ratio of graphene oxide to ethanol in the graphene oxide dispersion liquid is 1:10 to 1: 50.
6. The low-temperature graphene/graphite fluoride composite material as claimed in claim 1, wherein the magnetic stirring is performed at a rotation speed of 350-500r/min for 30-90 min.
7. The low-temperature graphene/graphite fluoride composite material of claim 1, wherein the blowing and drying are carried out at a temperature of 45-55 ℃.
8. The low-temperature graphene/graphite fluoride composite material of claim 1, wherein the temperature of the air-blast drying is 50 ℃.
9. The low-temperature graphene/graphite fluoride composite material of claim 1, wherein the thermal reduction is performed at a temperature of 300-400 ℃ for 1-30 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843178.8A CN111969188B (en) | 2020-08-20 | 2020-08-20 | Low-temperature graphene/graphite fluoride cathode material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010843178.8A CN111969188B (en) | 2020-08-20 | 2020-08-20 | Low-temperature graphene/graphite fluoride cathode material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111969188A true CN111969188A (en) | 2020-11-20 |
| CN111969188B CN111969188B (en) | 2022-06-17 |
Family
ID=73388722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010843178.8A Active CN111969188B (en) | 2020-08-20 | 2020-08-20 | Low-temperature graphene/graphite fluoride cathode material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111969188B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466177A (en) * | 2014-12-03 | 2015-03-25 | 湘潭大学 | Nickel coated carbon fluoride positive electrode material and preparation method thereof |
| CN106229511A (en) * | 2016-10-13 | 2016-12-14 | 江苏超电新能源科技发展有限公司 | Surface modifying method of a kind of fluorinated carbon material and products thereof and application |
| CN107919465A (en) * | 2017-11-01 | 2018-04-17 | 山东理工大学 | A kind of phenolic resin base carbon coating fluorographite positive electrode and preparation method thereof |
| CN108123133A (en) * | 2016-11-28 | 2018-06-05 | 中国科学院大连化学物理研究所 | Sandwich structure monoblock type self-supporting fluorination carbon electrode material and preparation method thereof |
| WO2019095717A1 (en) * | 2017-11-15 | 2019-05-23 | 厦门大学 | Lithium primary cell |
| US20190372099A1 (en) * | 2018-06-01 | 2019-12-05 | Nanotek Instruments, Inc. | Method of Producing Multi-Level Graphene-Protected Anode Active Material Particles for Battery Applications |
| CN110783522A (en) * | 2018-11-23 | 2020-02-11 | 贵州梅岭电源有限公司 | Preparation method of nanomaterial-modified carbon fluoride electrode material |
| CN111261925A (en) * | 2020-01-16 | 2020-06-09 | 东莞市沃泰通新能源有限公司 | Lithium iron phosphate power battery |
-
2020
- 2020-08-20 CN CN202010843178.8A patent/CN111969188B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466177A (en) * | 2014-12-03 | 2015-03-25 | 湘潭大学 | Nickel coated carbon fluoride positive electrode material and preparation method thereof |
| CN106229511A (en) * | 2016-10-13 | 2016-12-14 | 江苏超电新能源科技发展有限公司 | Surface modifying method of a kind of fluorinated carbon material and products thereof and application |
| CN108123133A (en) * | 2016-11-28 | 2018-06-05 | 中国科学院大连化学物理研究所 | Sandwich structure monoblock type self-supporting fluorination carbon electrode material and preparation method thereof |
| CN107919465A (en) * | 2017-11-01 | 2018-04-17 | 山东理工大学 | A kind of phenolic resin base carbon coating fluorographite positive electrode and preparation method thereof |
| WO2019095717A1 (en) * | 2017-11-15 | 2019-05-23 | 厦门大学 | Lithium primary cell |
| US20190372099A1 (en) * | 2018-06-01 | 2019-12-05 | Nanotek Instruments, Inc. | Method of Producing Multi-Level Graphene-Protected Anode Active Material Particles for Battery Applications |
| CN110783522A (en) * | 2018-11-23 | 2020-02-11 | 贵州梅岭电源有限公司 | Preparation method of nanomaterial-modified carbon fluoride electrode material |
| CN111261925A (en) * | 2020-01-16 | 2020-06-09 | 东莞市沃泰通新能源有限公司 | Lithium iron phosphate power battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111969188B (en) | 2022-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| He et al. | Preparation and electrochemical properties of Ag-modified TiO2 nanotube anode material for lithium–ion battery | |
| CN109921090B (en) | Lithium ion all-solid-state full battery and preparation method thereof | |
| Yu et al. | Surface engineering based on in situ electro-polymerization to boost the initial Coulombic efficiency of hard carbon anode for sodium-ion battery | |
| Radhika et al. | Synthesis and electrochemical performance of PEG-MnO2–sulfur composites cathode materials for lithium–sulfur batteries | |
| CN111900355A (en) | Carbon cathode of lithium ion battery and preparation method and application thereof | |
| CN111063872A (en) | Silicon-carbon negative electrode material and preparation method thereof | |
| Tsao et al. | Ionic conducting and surface active binder of poly (ethylene oxide)-block-poly (acrylonitrile) for high power lithium-ion battery | |
| Wang et al. | Separator modified by Y 2 O 3 nanoparticles-Ketjen Black hybrid and its application in lithium-sulfur battery | |
| CN106058257A (en) | Preparation method of graphene-coated silicon-carbon composite anode material and lithium ion battery | |
| CN110707288A (en) | Silicon-based negative electrode active material and preparation method and application thereof | |
| Liu et al. | Blended spherical lithium iron phosphate cathodes for high energy density lithium–ion batteries | |
| CN108232120B (en) | Synthesis of solid-state lithium battery and preparation method of graphite composite negative plate and lithium iron phosphate composite positive plate | |
| CN114242961A (en) | Graphene/silicon oxide-coated nano-silicon composite material, and preparation method and application thereof | |
| Wu et al. | Effect of nickel coated multi-walled carbon nanotubes on electrochemical performance of lithium-sulfur rechargeable batteries | |
| CN112768657A (en) | High-performance carbon negative electrode PTCDA hard carbon coated graphite material and preparation method thereof | |
| CN112421049A (en) | Method for preparing lithium battery silicon-carbon negative electrode material through ball milling and silicon-carbon negative electrode material | |
| CN111969188B (en) | Low-temperature graphene/graphite fluoride cathode material | |
| CN116364930A (en) | Compound additive and electrochemical device using same | |
| CN113764645B (en) | Preparation method of hard carbon composite material with three-dimensional structure | |
| CN115172680A (en) | High-capacity high-rate lithium ion battery and preparation method thereof | |
| CN108666548A (en) | A kind of preparation method of conductive polymer polymer poly 1,3- diacetylene-benzene coated LiFePO 4 for lithium ion batteries | |
| CN112687873B (en) | Preparation method of high-specific-energy lithium battery | |
| CN114975956A (en) | Fluorinated graphene/fluorinated graphite composite positive electrode material and preparation method thereof | |
| CN114824168A (en) | Lithium supplement agent and method for lithium ion battery anode, anode plate, lithium supplement slurry and battery | |
| CN109560280B (en) | Nano tin-molybdenum disulfide compound anode material and preparation method and application thereof |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |