CN112968156A - Low-cost graphene lithium battery composite material - Google Patents
Low-cost graphene lithium battery composite material Download PDFInfo
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- CN112968156A CN112968156A CN202110164306.0A CN202110164306A CN112968156A CN 112968156 A CN112968156 A CN 112968156A CN 202110164306 A CN202110164306 A CN 202110164306A CN 112968156 A CN112968156 A CN 112968156A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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
- H01M4/366—Composites as layered products
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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
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
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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
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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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 relates to the technical field of batteries, and discloses a low-cost graphene lithium battery composite material which comprises the following raw materials: the graphene-ceramic-alumina composite material comprises graphene, ceramic alumina and conductive carbon black, wherein the graphene-ceramic-alumina composite material comprises the following components in parts by mass: 2-5 parts of graphene and 95-98 parts of ceramic alumina, wherein the conductive carbon black composite material comprises the following components in parts by mass: 1-2 parts of graphene, 28-29 parts of ceramic alumina and 70 parts of conductive carbon black. The invention has the advantages that: by forming the ceramic alumina and the graphene into the composite material, the coating amount of the graphene is guaranteed to be two percent, the coating amount is also the mass fraction, the two materials form the composite material, the coating effect is good, the composite material has high heat resistance and flame retardant property, the coulomb efficiency of a single material is improved, the discharge specific capacity of the whole material is increased, the requirement of actual use is met, the preparation process of the whole material is simple, and the production is convenient.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a low-cost graphene lithium battery composite material.
Background
The conductive carbon black material attracts attention with the ultrahigh specific discharge capacity, namely, the conductive carbon black material has larger irreversible specific charge capacity, and the graphene has the characteristics of high conductivity, large specific surface area, special two-dimensional network structure and the like, can be used for coating the conductive carbon black material and relieving the polarization of the material, and the metamaterial has a honeycomb type microstructure inside and can provide ultrahigh elasticity and structural robustness. The composite material is composed of interconnected graphene layers sandwiched between ceramic layers. Graphene scaffolds, also known as aerogels, are chemically bonded to a ceramic layer using a process known as atomic layer deposition. The graphene aerogel has a geometrical shape, and a thin ceramic layer is deposited, so that the graphene becomes a more practical functional material. However, the currently used graphene battery has unstable discharge, and the capacity retention rate of the battery is low and the impedance is high due to the fact that the proportion of the currently used graphene composite material is not appropriate, so that the invention provides a low-cost graphene lithium battery composite material for solving the existing problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a low-cost graphene lithium battery composite material which has the advantages of high discharge specific capacity, stable discharge, high capacity retention rate, low impedance and the like, and solves the problems of unstable discharge, low capacity retention rate and high impedance.
(II) technical scheme
In order to achieve the purposes of high discharge specific capacity, stable discharge, high capacity retention rate and low impedance, the invention provides the following technical scheme: a low-cost graphene lithium battery composite material comprises the following raw materials: the graphene-ceramic-alumina composite material comprises graphene, ceramic alumina and conductive carbon black, wherein the graphene-ceramic-alumina composite material comprises the following components in parts by mass: 2-5 parts of graphene and 95-98 parts of ceramic alumina, wherein the conductive carbon black composite material comprises the following components in parts by mass: 1-2 parts of graphene, 28-29 parts of ceramic alumina and 70 parts of conductive carbon black.
A preparation method of a low-cost graphene lithium battery composite material comprises the following steps:
1) taking out the graphene and the ceramic alumina, placing the graphene and the ceramic alumina on a balance tray, weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
2) dissolving the graphene taken out according to the proportion of the formula, filtering, and finally placing the graphene into a dryer for drying for later use;
3) putting the ceramic alumina taken out according to the proportion of the formula into a crusher for crushing, and screening the crushed powder;
4) adding the dried graphene into alcohol to prepare a solution, putting the screened ceramic alumina into the prepared solution, and stirring and grinding by using a ball mill to form a graphene and ceramic alumina composite solution;
5) placing the graphene and ceramic alumina composite solution into a dryer for drying for later use;
6) taking out the dried graphene, ceramic alumina composite material and conductive carbon black, placing the materials on a balance tray for weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
7) placing the conductive carbon black taken out according to the proportion of the formula into a dryer for drying;
8) placing the graphene, ceramic alumina composite material and conductive carbon black which are taken out according to the proportion of the formula in hydrothermal reaction equipment;
9) and after the collected crystals are subjected to quantitative quality inspection, respectively sealing and storing qualified and unqualified crystals.
Preferably, the filtration frequency of the graphene in the step 2) is more than 3, the drying time of the graphene in the step 2) is 20-24 hours, and the drying temperature of the graphene in the step 2) is 55-65 ℃.
Preferably, the crushing time of the ceramic alumina in the step 3) is 3-4 hours, and the particle diameter of the ceramic alumina screened in the step 3) is 10-20 microns.
Preferably, the rotation speed of the ball mill in the step 4) is set to 80-100 revolutions per minute, and the mixing time of the graphene solution and the ceramic alumina powder in the step 4) is 40 minutes-1 hour.
Preferably, the drying time of the graphene and ceramic alumina composite solution in the step 5) is 24 to 26 hours, and the drying time of the conductive carbon black in the step 7) is 30 minutes.
Preferably, the pressure of the hydrothermal reaction device in the step 8) is set to be 30-40 MPa, and the temperature of the hydrothermal reaction device in the step 8) is set to be 1400-1600 ℃.
Preferably, the quality inspection content in the step 9) is a capacity retention rate, and the unqualified composite material with the capacity retention rate lower than eighty-five percent is an unqualified composite material.
(III) advantageous effects
Compared with the prior art, the invention provides a low-cost graphene lithium battery composite material, which has the following beneficial effects:
1. this low-cost graphite alkene lithium electricity combined material through forming combined material with ceramic alumina and graphite alkene to guarantee that the cladding volume of graphite alkene is two percent, wherein the cladding volume also is the mass fraction, the material that accords with that two kinds of materials formed, its cladding effect is better, and has higher heat resistance and fire behaviour, has still promoted single material's coulomb efficiency simultaneously, and has increased the specific discharge capacity of whole material, satisfies the needs of in-service use.
2. This low-cost graphite alkene lithium electricity combined material through the combined material who uses hydrothermal method preparation graphite alkene and conductive carbon black, can reach combined material and be heated even purpose, uses the mixer to stir the material simultaneously, can effectual promotion combined material's preparation efficiency to in the combined material preparation process of graphite alkene and ceramic alumina, carry out high temperature heating, make graphite alkene and ceramic alumina can react thoroughly, avoid appearing the caking phenomenon, influence combined material's follow-up use.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a low-cost graphene lithium battery composite material comprises the following raw materials: the graphene-ceramic composite material comprises graphene, ceramic alumina and conductive carbon black, wherein the graphene-ceramic alumina composite material comprises the following components in parts by mass: 2 parts of graphene and 98 parts of ceramic alumina guarantee that the ratio of graphene and ceramic alumina is suitable, make the cladding effect of graphene better, promoted combined material's coulombic efficiency and discharge specific capacity, the quality ratio part of conductive carbon black combined material is: the composite material comprises, by weight, 1 part of graphene, 28 parts of ceramic alumina and 70 parts of conductive carbon black, so that the crystallization effect between the graphene and ceramic alumina composite material and the conductive carbon black is good, and the whole composite material has high specific discharge capacity, capacity retention rate and low impedance.
A preparation method of a low-cost graphene lithium battery composite material comprises the following steps:
1) taking out the graphene and the ceramic alumina, placing the graphene and the ceramic alumina on a balance tray, weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
2) dissolving the graphene taken out according to the proportion of the formula, filtering, and finally placing the graphene into a dryer for drying for later use;
3) putting the ceramic alumina taken out according to the proportion of the formula into a crusher for crushing, and screening the crushed powder;
4) adding the dried graphene into alcohol to prepare a solution, putting the screened ceramic alumina into the prepared solution, and stirring and grinding by using a ball mill to form a graphene and ceramic alumina composite solution;
5) placing the graphene and ceramic alumina composite solution into a dryer for drying for later use;
6) taking out the dried graphene, ceramic alumina composite material and conductive carbon black, placing the materials on a balance tray for weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
7) placing the conductive carbon black taken out according to the proportion of the formula into a dryer for drying;
8) placing the graphene, ceramic alumina composite material and conductive carbon black which are taken out according to the proportion of the formula in hydrothermal reaction equipment;
9) and after the collected crystals are subjected to quantitative quality inspection, respectively sealing and storing qualified and unqualified crystals.
According to the steps, the graphene and ceramic alumina are mixed to prepare the graphene composite material, so that the graphene coating effect is good, the specific discharge capacity of the whole material is improved, and then the prepared graphene and ceramic alumina composite material and conductive carbon black are subjected to hydrothermal reaction to form a corresponding conductive composite material.
The filtering times of the graphene in the step 2) are more than 3, the drying time of the graphene in the step 2) is 20 hours, and the drying temperature of the graphene in the step 2) is 55 ℃, so that the proper temperature is ensured, the drying speed of the material is increased while the chemical performance of the material is not damaged, and the preparation time is shortened.
The crushing time of the ceramic alumina in the step 3) is 4 hours, and the material with the particle diameter of 10 microns and the smaller particle diameter of the ceramic alumina screened in the step 3) can fully react to improve the fusion coating effect between the two materials.
The rotating speed of the ball mill in the step 4) is set at 100 revolutions per minute, and the mixing time of the graphene solution and the ceramic alumina powder in the step 4) is 40 minutes, so that the mixing time is reduced, and the production efficiency can be improved.
The drying time of the graphene and ceramic alumina composite solution in the step 5 is 24 hours, and the drying time of the conductive carbon black in the step 7) is 30 minutes, so that the proper drying degree of the graphene and the ceramic alumina is ensured, and a user can conveniently perform the next preparation.
The air pressure of the hydrothermal reaction equipment in the step 8) is set to be 30 MPa, the temperature of the hydrothermal reaction equipment in the step 8) is set to be 1400 ℃, the materials can be fully reacted under the conditions of heating and pressurizing, the crystallization effect is good, the hydrothermal method is used for preparing the material, the material is uniformly heated in the processing process, and the preparation efficiency is improved.
The quality inspection content in the step 9) is a capacity retention rate, and the composite material with the capacity retention rate lower than eighty-five percent is an unqualified composite material, and various physical and chemical properties of substances formed by materials with different proportions can be analyzed by taking a certain dosage of quality inspection, and meanwhile, the delivery quality can be improved.
Example two:
a low-cost graphene lithium battery composite material comprises the following raw materials: the graphene-ceramic-alumina composite material comprises graphene, ceramic alumina and conductive carbon black, wherein the graphene-ceramic-alumina composite material comprises the following components in parts by mass: 3 parts of graphene and 97 parts of ceramic alumina, the amount of the graphene is increased, the coating amount of the graphene is increased, but the coating effect of the graphene is reduced, and the conductive carbon black composite material comprises the following components in parts by mass: 1 part of graphene, 25 parts of ceramic alumina and 74 parts of conductive carbon black, and the proportion of the conductive carbon black is increased, so that the crystallization amount of the composite material can be increased.
A preparation method of a low-cost graphene lithium battery composite material comprises the following steps:
1) taking out the graphene and the ceramic alumina, placing the graphene and the ceramic alumina on a balance tray, weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
2) dissolving the graphene taken out according to the proportion of the formula, filtering, and finally placing the graphene into a dryer for drying for later use;
3) putting the ceramic alumina taken out according to the proportion of the formula into a crusher for crushing, and screening the crushed powder;
4) adding the dried graphene into alcohol to prepare a solution, putting the screened ceramic alumina into the prepared solution, and stirring and grinding by using a ball mill to form a graphene and ceramic alumina composite solution;
5) placing the graphene and ceramic alumina composite solution into a dryer for drying for later use;
6) taking out the dried graphene, ceramic alumina composite material and conductive carbon black, placing the materials on a balance tray for weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
7) placing the conductive carbon black taken out according to the proportion of the formula into a dryer for drying;
8) placing the graphene, ceramic alumina composite material and conductive carbon black which are taken out according to the proportion of the formula in hydrothermal reaction equipment;
9) and after the collected crystals are subjected to quantitative quality inspection, respectively sealing and storing qualified and unqualified crystals.
According to the steps, the graphene and ceramic alumina are mixed to prepare the graphene composite material, so that the graphene coating effect is good, the specific discharge capacity of the whole material is improved, and then the prepared graphene and ceramic alumina composite material and conductive carbon black are subjected to hydrothermal reaction to form a corresponding conductive composite material.
The filtering times of the graphene in the step 2) are more than 3, the drying time of the graphene in the step 2) is 20 hours, and the drying temperature of the graphene in the step 2) is 65 ℃, so that the drying temperature is increased, the drying time is reduced, and the production efficiency can be improved.
The crushing time of the ceramic alumina in the step 3) is 3 hours, the particle diameter of the ceramic alumina screened in the step 3) is 15 micrometers, the particle diameter of the material is reduced, the crushing time can be shortened, and the production efficiency is improved to a certain extent.
The rotating speed of the ball mill in the step 4) is set to 90 revolutions per minute, the mixing time of the graphene solution and the ceramic alumina powder in the step 4) is 1 hour, the rotating speed and the time are increased, the graphene solution and the ceramic alumina powder are uniformly mixed, and the next preparation is convenient to carry out.
The drying time of the graphene and ceramic alumina composite solution in the step 5 is 24 hours, and the drying time of the conductive carbon black in the step 7) is 30 minutes, so that the proper drying degree of the graphene and the ceramic alumina is ensured, and a user can conveniently perform the next preparation.
The air pressure of the hydrothermal reaction equipment in the step 8) is set to be 40 MPa, and the temperature of the hydrothermal reaction equipment in the step 8) is set to be 1600 ℃, so that the pressure and the reaction temperature are increased, the material reaction is more sufficient, and the reaction efficiency can be increased.
The quality inspection content in the step 9) is a capacity retention rate, and the composite material with the capacity retention rate lower than eighty-five percent is an unqualified composite material, and various physical and chemical properties of substances formed by materials with different proportions can be analyzed by taking a certain dosage of quality inspection, and meanwhile, the delivery quality can be improved.
The invention has the beneficial effects that: the composite material is formed by ceramic alumina and graphene, the coating amount of the graphene is two percent, namely the mass fraction, the coating effect of the composite material is good, the composite material has high heat resistance and flame retardant property, the coulomb efficiency of a single material is improved, the discharge specific capacity of the whole material is increased, the requirement of actual use is met, the prepared composite material of the graphene and the ceramic alumina and conductive carbon black are subjected to hydrothermal reaction to form the corresponding conductive composite material, compared with the single material, the capacity retention rate is greatly improved, the impedance of the material is reduced, the aim of uniformly heating the composite material is fulfilled, meanwhile, a stirrer is used for stirring the material, the preparation efficiency of the composite material can be effectively improved, and in the preparation process of the composite material of the graphene and the ceramic alumina, and (3) carrying out high-temperature heating to ensure that the graphene and the ceramic alumina can react thoroughly, so as to avoid the caking phenomenon and influence the subsequent use of the composite material, wherein when the graphene is reduced by hydrothermal reduction, the conductive carbon black material is doped in the graphene, so that the agglomeration of the graphene is hindered, and finally the composite material taking the graphene as a conductive network is formed. The coating of the graphene can improve the conductivity of the material, reduce the polarization of the material, improve the discharge capacity of the material, and simultaneously, the graphene on the surface is also beneficial to the material to resist the corrosion of electrolyte, thereby improving the cycle performance of the material.
Typical cases are as follows:
a low-cost graphene lithium battery composite material comprises the following raw materials: the graphene-ceramic composite material comprises graphene, ceramic alumina and conductive carbon black, wherein the graphene-ceramic alumina composite material comprises the following components in parts by mass: 2 parts of graphene and 98 parts of ceramic alumina guarantee that the ratio of graphene and ceramic alumina is suitable, make the cladding effect of graphene better, promoted combined material's coulombic efficiency and discharge specific capacity, the quality ratio part of conductive carbon black combined material is: the composite material comprises, by weight, 1 part of graphene, 28 parts of ceramic alumina and 70 parts of conductive carbon black, so that the crystallization effect between the graphene and ceramic alumina composite material and the conductive carbon black is good, and the whole composite material has high specific discharge capacity, capacity retention rate and low impedance.
A preparation method of a low-cost graphene lithium battery composite material comprises the following steps:
1) taking out the graphene and the ceramic alumina, placing the graphene and the ceramic alumina on a balance tray, weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
2) dissolving the graphene taken out according to the proportion of the formula, filtering, and finally placing the graphene into a dryer for drying for later use;
3) putting the ceramic alumina taken out according to the proportion of the formula into a crusher for crushing, and screening the crushed powder;
4) adding the dried graphene into alcohol to prepare a solution, putting the screened ceramic alumina into the prepared solution, and stirring and grinding by using a ball mill to form a graphene and ceramic alumina composite solution;
5) placing the graphene and ceramic alumina composite solution into a dryer for drying for later use;
6) taking out the dried graphene, ceramic alumina composite material and conductive carbon black, placing the materials on a balance tray for weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
7) placing the conductive carbon black taken out according to the proportion of the formula into a dryer for drying;
8) placing the graphene, ceramic alumina composite material and conductive carbon black which are taken out according to the proportion of the formula in hydrothermal reaction equipment;
9) and after the collected crystals are subjected to quantitative quality inspection, respectively sealing and storing qualified and unqualified crystals.
According to the steps, the graphene and ceramic alumina are mixed to prepare the graphene composite material, so that the graphene coating effect is good, the specific discharge capacity of the whole material is improved, and then the prepared graphene and ceramic alumina composite material and conductive carbon black are subjected to hydrothermal reaction to form a corresponding conductive composite material.
The filtering times of the graphene in the step 2) are more than 3, the drying time of the graphene in the step 2) is 20 hours, and the drying temperature of the graphene in the step 2) is 55 ℃, so that the proper temperature is ensured, the drying speed of the material is increased while the chemical performance of the material is not damaged, and the preparation time is shortened.
The crushing time of the ceramic alumina in the step 3) is 4 hours, and the material with the particle diameter of 10 microns and the smaller particle diameter of the ceramic alumina screened in the step 3) can fully react to improve the fusion coating effect between the two materials.
The rotating speed of the ball mill in the step 4) is set at 100 revolutions per minute, and the mixing time of the graphene solution and the ceramic alumina powder in the step 4) is 40 minutes, so that the mixing time is reduced, and the production efficiency can be improved.
The drying time of the graphene and ceramic alumina composite solution in the step 5 is 24 hours, and the drying time of the conductive carbon black in the step 7) is 30 minutes, so that the proper drying degree of the graphene and the ceramic alumina is ensured, and a user can conveniently perform the next preparation.
The air pressure of the hydrothermal reaction equipment in the step 8) is set to be 30 MPa, the temperature of the hydrothermal reaction equipment in the step 8) is set to be 1400 ℃, the materials can be fully reacted under the conditions of heating and pressurizing, the crystallization effect is good, the hydrothermal method is used for preparing the material, the material is uniformly heated in the processing process, and the preparation efficiency is improved.
The quality inspection content in the step 9) is a capacity retention rate, and the composite material with the capacity retention rate lower than eighty-five percent is an unqualified composite material, and various physical and chemical properties of substances formed by materials with different proportions can be analyzed by taking a certain dosage of quality inspection, and meanwhile, the delivery quality can be improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The low-cost graphene lithium battery composite material is characterized by comprising the following raw materials: the graphene-ceramic-alumina composite material comprises graphene, ceramic alumina and conductive carbon black, wherein the graphene-ceramic-alumina composite material comprises the following components in parts by mass: 2-5 parts of graphene and 95-98 parts of ceramic alumina, wherein the conductive carbon black composite material comprises the following components in parts by mass: 1-2 parts of graphene, 28-29 parts of ceramic alumina and 70 parts of conductive carbon black.
2. The preparation method of the low-cost graphene lithium battery composite material is characterized by comprising the following steps:
1) taking out the graphene and the ceramic alumina, placing the graphene and the ceramic alumina on a balance tray, weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
2) dissolving the graphene taken out according to the proportion of the formula, filtering, and finally placing the graphene into a dryer for drying for later use;
3) putting the ceramic alumina taken out according to the proportion of the formula into a crusher for crushing, and screening the crushed powder;
4) adding the dried graphene into alcohol to prepare a solution, putting the screened ceramic alumina into the prepared solution, and stirring and grinding by using a ball mill to form a graphene and ceramic alumina composite solution;
5) placing the graphene and ceramic alumina composite solution into a dryer for drying for later use;
6) taking out the dried graphene, ceramic alumina composite material and conductive carbon black, placing the materials on a balance tray for weighing, and taking out corresponding raw materials according to the specific gravity in the formula;
7) placing the conductive carbon black taken out according to the proportion of the formula into a dryer for drying;
8) placing the graphene, ceramic alumina composite material and conductive carbon black which are taken out according to the proportion of the formula in hydrothermal reaction equipment;
9) and after the collected crystals are subjected to quantitative quality inspection, respectively sealing and storing qualified and unqualified crystals.
3. The preparation method of the low-cost graphene lithium battery composite material according to claim 2, wherein the filtering times of the graphene in the step 2) are more than 3, the drying time of the graphene in the step 2) is 20-24 hours, and the drying temperature of the graphene in the step 2) is 55-65 ℃.
4. The preparation method of the low-cost graphene lithium battery composite material according to claim 2, wherein the crushing time of the ceramic alumina in the step 3) is 3-4 hours, and the particle diameter of the ceramic alumina screened in the step 3) is 10-20 microns.
5. The preparation method of the low-cost graphene lithium battery composite material according to claim 2, wherein the rotation speed of the ball mill in the step 4) is set to 80-100 revolutions per minute, and the mixing time of the graphene solution and the ceramic alumina powder in the step 4) is 40 minutes-1 hour.
6. The preparation method of the low-cost graphene lithium battery composite material according to claim 2, wherein the drying time of the graphene and ceramic alumina composite solution in the step 5) is 24-26 hours, and the drying time of the conductive carbon black in the step 7) is 30 minutes.
7. The preparation method of the low-cost graphene lithium battery composite material as claimed in claim 2, wherein the pressure of the hydrothermal reaction equipment in the step 8) is set to be 30-40 mpa, and the temperature of the hydrothermal reaction equipment in the step 8) is set to be 1400-1600 ℃.
8. The method for preparing the low-cost graphene lithium battery composite material according to claim 2, wherein quality inspection content in the step 9) is capacity retention rate, and the capacity retention rate is lower than eighty-five percent, so that the graphene lithium battery composite material is an unqualified composite material.
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