CN113140733A - Preparation process of lithium battery based on carbon-coated aluminum foil - Google Patents

Preparation process of lithium battery based on carbon-coated aluminum foil Download PDF

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CN113140733A
CN113140733A CN202110332897.8A CN202110332897A CN113140733A CN 113140733 A CN113140733 A CN 113140733A CN 202110332897 A CN202110332897 A CN 202110332897A CN 113140733 A CN113140733 A CN 113140733A
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aluminum foil
carbon
negative electrode
positive electrode
coated
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金容升
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Nantong Naiweite Power Supply Co ltd
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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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention discloses a carbon-coated aluminum foil-based lithium battery preparation process which comprises the steps of positive and negative electrode slurry preparation, carbon-coated aluminum foil preparation, positive and negative electrode plate preparation, winding assembly, testing and screening, wherein nano conductive graphite and carbon coated particles are uniformly mixed to form a carbon mixture, the carbon mixture is ground into carbon mixture powder, the optical aluminum foil is heated, the carbon mixture powder is uniformly and finely coated on the optical aluminum foil at the temperature of 400-580 ℃, then the temperature of the optical aluminum foil is increased to 650-660 ℃, and redundant carbon mixture powder on the surface of the optical aluminum foil is cleaned after natural cooling, so that the preparation of the carbon-coated aluminum foil is completed. The carbon-coated aluminum foil can provide excellent static conductivity, and can greatly reduce the contact resistance between the cathode material and the carbon-coated aluminum foil, thereby reducing the internal resistance of the battery, improving the adhesion capacity between the cathode material and the carbon-coated aluminum foil, reducing the usage amount of the binder and further obviously improving the overall performance of the lithium battery.

Description

Preparation process of lithium battery based on carbon-coated aluminum foil
Technical Field
The invention belongs to the technical field of lithium battery preparation, and particularly relates to a preparation process of a lithium battery based on a carbon-coated aluminum foil.
Background
The lithium battery realizes normal operation by utilizing the reverse movement of lithium ions and electrons stored in a positive electrode material in the charging and discharging process, and has the main structures of a positive electrode, a negative electrode and electrolyte. Besides the four main parts, the current collectors used for storing the anode and cathode materials are also important components of the lithium battery, and the current collectors have the main function of collecting the current generated by the active substances of the battery so as to form larger current for outputting. According to the working principle and the structural design of the lithium ion battery, the anode material and the cathode material need to be coated on a conductive current collector, so that the current collector is in full contact with an active material, and the internal resistance is as small as possible.
The copper foil and the aluminum foil have the advantages of good conductivity, formed oxidation protection film, soft texture, favorable adhesion, mature manufacturing technology, relatively low price and the like, and are selected as main materials of the lithium battery current collector. The positive electrode potential of the lithium battery is high, the oxidation layer of the aluminum foil is compact, and the current collector can be prevented from being oxidized, so that the aluminum foil is selected as the positive electrode conductive current collector in the prior art.
However, in the prior art, a relatively large amount of binder is required in the process of preparing the aluminum foil to improve the adhesion between the cathode material and the aluminum foil, but the contact resistance between the cathode material and the aluminum foil is increased, which is not favorable for improving the overall performance of the battery.
Therefore, in view of the above technical problems, it is necessary to provide a process for preparing a lithium battery based on a carbon-coated aluminum foil.
Disclosure of Invention
The invention aims to provide a preparation process of a lithium battery based on a carbon-coated aluminum foil, so as to solve the problems.
In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:
a preparation process of a lithium battery based on a carbon-coated aluminum foil comprises the following steps:
s1 preparation of positive and negative electrode slurry
Mixing and uniformly stirring a positive electrode main material, a positive electrode solvent and a positive electrode binder to prepare a positive electrode slurry;
mixing and uniformly stirring the negative electrode main material, the negative electrode solvent and the negative electrode binder to prepare negative electrode slurry;
s2 preparation of carbon-coated aluminum foil
Uniformly mixing the nano conductive graphite and the carbon-coated particles to form a carbon mixture, and grinding the carbon mixture into carbon mixture powder;
heating the optical aluminum foil, uniformly and finely coating carbon mixture powder on the optical aluminum foil at the temperature of 400-580 ℃, then increasing the temperature of the optical aluminum foil to 650-660 ℃, naturally cooling, and cleaning redundant carbon mixture powder on the surface of the optical aluminum foil to finish the preparation of the carbon-coated aluminum foil;
s3 preparation of positive and negative electrode plates
Uniformly coating the positive electrode slurry on the surface of the carbon-coated aluminum foil through a positive electrode automatic coating machine, and automatically cutting after automatic drying to prepare a positive electrode plate;
uniformly coating the negative slurry on the surface of the copper foil through a negative automatic coating machine, and automatically cutting after automatic drying to prepare a negative pole piece;
s4, winding assembly
Winding and injecting electrolyte into the positive pole piece, the first diaphragm, the negative pole piece and the second diaphragm from top to bottom, and then sealing and welding the positive pole piece and the negative pole piece to finish the assembly process of the battery to obtain a finished battery;
s5 test screening
And placing the finished product battery in a test cabinet for charge and discharge test, and screening out qualified finished product batteries.
As a further improvement of the present invention, in S1, the positive electrode main material is lithium iron phosphate, and the positive electrode binder is one or more of polytetrafluoroethylene, polyacrylonitrile, styrene butadiene rubber, and sodium carboxymethyl cellulose.
As a further improvement of the present invention, in S1, the mass percentages of the positive electrode main material, the positive electrode solvent and the positive electrode binder are as follows: 72-78% of a positive electrode main material, 21-29% of a positive electrode solvent and 1-2% of a positive electrode binder.
As a further improvement of the present invention, in S1, the negative electrode main material is titanate, and the negative electrode binder is one or more of polyvinylidene fluoride, styrene butadiene rubber, polyacrylonitrile, and polyacrylate.
As a further improvement of the present invention, in S1, the mass percentages of the negative electrode main material, the negative electrode solvent, and the negative electrode binder are: 74-85% of a negative electrode main material, 18-20% of a negative electrode solvent and 2-6% of a negative electrode binder.
As a further improvement of the invention, in S2, the thickness of the optical aluminum foil is 9-35 microns.
In a further improvement of the present invention, in S2, the alloy designation of the optical aluminum foil is one of 1060, 1050, 1145 and 1235, and the work-hardened state of the optical aluminum foil is one of-O, H14, -H24, -H22 and-H18.
As a further improvement of the present invention, in S2, the mass percentages of the nano conductive graphite and the carbon-coated particles are: 50-70% of nano conductive graphite and 30-50% of carbon-coated particles.
In a further improvement of the present invention, in S2, the largest outer diameter of the particles in the carbon mixture powder is 0.1 to 0.5 μm.
As a further improvement of the present invention, in S4, the electrolyte solution includes a solute and a solvent, the solute is one or more of lithium perchlorate, lithium hexafluorophosphate and lithium tetrafluoroborate, and the solvent is one or more of diethyl ether, ethylene carbonate, propylene carbonate and diethyl carbonate.
Compared with the prior art, the invention has the following advantages:
the carbon-coated aluminum foil can provide excellent static conductivity, and can greatly reduce the contact resistance between the cathode material and the carbon-coated aluminum foil, thereby reducing the internal resistance of the battery, improving the adhesion capacity between the cathode material and the carbon-coated aluminum foil, reducing the usage amount of the binder and further obviously improving the overall performance of the lithium battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flow chart of a process for preparing a lithium battery based on a carbon-coated aluminum foil according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. The embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.
Example 1:
the invention discloses a preparation process of a lithium battery based on a carbon-coated aluminum foil, which comprises the following steps:
s1 preparation of positive and negative electrode slurry
Mixing and uniformly stirring a positive electrode main material, a positive electrode solvent and a positive electrode binder to prepare a positive electrode slurry;
specifically, the main material of the positive electrode is lithium iron phosphate, and the positive electrode binder is one or more of polytetrafluoroethylene, polyacrylonitrile, styrene butadiene rubber and sodium carboxymethylcellulose.
The mass percentages of the anode main material, the anode solvent and the anode binder are as follows: 78% of a positive electrode main material, 21% of a positive electrode solvent and 1% of a positive electrode binder.
Mixing and uniformly stirring the negative electrode main material, the negative electrode solvent and the negative electrode binder to prepare negative electrode slurry;
specifically, the negative electrode main material is titanate, and the negative electrode binder is one or more of polyvinylidene fluoride, styrene butadiene rubber, polyacrylonitrile and polyacrylate.
The mass percentages of the negative electrode main material, the negative electrode solvent and the negative electrode binder are as follows: 80% of negative electrode main material, 18% of negative electrode solvent and 2% of negative electrode binder
S2 preparation of carbon-coated aluminum foil
Uniformly mixing the nano conductive graphite and the carbon-coated particles to form a carbon mixture, and grinding the carbon mixture into carbon mixture powder;
heating the optical aluminum foil, uniformly and finely coating carbon mixture powder on the optical aluminum foil at the temperature of 400 ℃, then increasing the temperature of the optical aluminum foil to 650 ℃, naturally cooling, and cleaning redundant carbon mixture powder on the surface of the optical aluminum foil to finish the preparation of the carbon-coated aluminum foil;
the 660-degree aluminum foil is the melting point of metal aluminum, the optical aluminum foil is heated to 650 degrees, namely the melting point is close to the critical point of the melting point of the optical aluminum foil, aluminum molecules on the optical aluminum foil are active and can be mixed with carbon mixture powder between molecules, a compression roller can be used for rolling to ensure the effect of the formed conductive coating, the degree of mixing between molecules is increased, the stability and the durability of the conductive coating can be ensured, and the shedding can be avoided.
Specifically, the thickness of the optical aluminum foil is 9 microns, the thickness is thinner compared with the conventional aluminum foil, the alloy number of the optical aluminum foil is one of 1060, 1050, 1145 and 1235, and the work hardening state of the optical aluminum foil is one of-O, H14, -H24, -H22 and-H18.
The mass percentages of the nano conductive graphite and the carbon-coated particles are as follows: 80% of nano conductive graphite, 30% of carbon-coated particles and 0.1 micron of maximum outer diameter of particles in the carbon mixture powder, so that a good conductive coating can be formed.
The advantages of the carbon-coated aluminum foil in the application of the lithium ion battery include: the processing performance of lithium iron phosphate and lithium titanate materials is improved; the adhesive force of the active substance and the current collector is improved, and the manufacturing cost of the pole piece is reduced; battery polarization is inhibited, thermal effect is reduced, and rate capability is improved; the consistency is improved, and the cycle life of the battery is prolonged; protecting the current collector from being corroded by the electrolyte; the internal resistance of the battery is reduced, and the dynamic internal resistance amplification in the circulation process is obviously reduced.
S3 preparation of positive and negative electrode plates
Uniformly coating the positive electrode slurry on the surface of the carbon-coated aluminum foil through a positive electrode automatic coating machine, and automatically cutting after automatic drying to prepare a positive electrode plate;
uniformly coating the negative slurry on the surface of the copper foil through a negative automatic coating machine, and automatically cutting after automatic drying to prepare a negative pole piece;
s4, winding assembly
Winding and injecting electrolyte into the positive pole piece, the first diaphragm, the negative pole piece and the second diaphragm from top to bottom, and then sealing and welding the positive pole piece and the negative pole piece to finish the assembly process of the battery to obtain a finished battery;
the electrolyte comprises a solute and a solvent, wherein the solute is one or more of lithium perchlorate, lithium hexafluorophosphate and lithium tetrafluoroborate, and the solvent is one or more of diethyl ether, ethylene carbonate, propylene carbonate and diethyl carbonate.
S5 test screening
And placing the finished product battery in a test cabinet for charge and discharge test, and screening out qualified finished product batteries.
Example 2:
the invention discloses a preparation process of a lithium battery based on a carbon-coated aluminum foil, which comprises the following steps:
s1 preparation of positive and negative electrode slurry
Mixing and uniformly stirring a positive electrode main material, a positive electrode solvent and a positive electrode binder to prepare a positive electrode slurry;
specifically, the main material of the positive electrode is lithium iron phosphate, and the positive electrode binder is one or more of polytetrafluoroethylene, polyacrylonitrile, styrene butadiene rubber and sodium carboxymethylcellulose.
The mass percentages of the anode main material, the anode solvent and the anode binder are as follows: 72% of a positive electrode main material, 26% of a positive electrode solvent and 2% of a positive electrode binder.
Mixing and uniformly stirring the negative electrode main material, the negative electrode solvent and the negative electrode binder to prepare negative electrode slurry;
specifically, the negative electrode main material is titanate, and the negative electrode binder is one or more of polyvinylidene fluoride, styrene butadiene rubber, polyacrylonitrile and polyacrylate.
The mass percentages of the negative electrode main material, the negative electrode solvent and the negative electrode binder are as follows: 74 percent of negative electrode main material, 20 percent of negative electrode solvent and 6 percent of negative electrode binder
S2 preparation of carbon-coated aluminum foil
Uniformly mixing the nano conductive graphite and the carbon-coated particles to form a carbon mixture, and grinding the carbon mixture into carbon mixture powder;
heating the optical aluminum foil, uniformly and finely coating carbon mixture powder on the optical aluminum foil at the temperature of 580 ℃, then increasing the temperature of the optical aluminum foil to be close to 660 ℃, naturally cooling, and cleaning redundant carbon mixture powder on the surface of the optical aluminum foil to finish the preparation of the carbon-coated aluminum foil;
wherein, 660 degree is metallic aluminum's melting point, heats light aluminium foil to being close 660 degrees, specifically can be 559 degrees, and the aluminium molecule on the light aluminium foil is active, can produce the mixing between the molecule with carbon mixture powder, for the effect of the conductive coating who guarantees to form, can also use the compression roller to roll, increases the degree that the molecule mixes, can ensure conductive coating's stability and durability, the condition that can not take place to drop.
Specifically, the thickness of the optical aluminum foil is 35 microns, the alloy number of the optical aluminum foil is one of 1060, 1050, 1145 and 1235, and the work hardening state of the optical aluminum foil is one of-O, H14, -H24, -H22 and-H18.
The mass percentages of the nano conductive graphite and the carbon-coated particles are as follows: 70% of nano conductive graphite, 30% of carbon-coated particles and 0.5 micron of maximum outer diameter of particles in the carbon mixture powder, so that a good conductive coating can be formed.
The advantages of the carbon-coated aluminum foil in the application of the lithium ion battery include: the processing performance of lithium iron phosphate and lithium titanate materials is improved; the adhesive force of the active substance and the current collector is improved, and the manufacturing cost of the pole piece is reduced; battery polarization is inhibited, thermal effect is reduced, and rate capability is improved; the consistency is improved, and the cycle life of the battery is prolonged; protecting the current collector from being corroded by the electrolyte; the internal resistance of the battery is reduced, and the dynamic internal resistance amplification in the circulation process is obviously reduced.
S3 preparation of positive and negative electrode plates
Uniformly coating the positive electrode slurry on the surface of the carbon-coated aluminum foil through a positive electrode automatic coating machine, and automatically cutting after automatic drying to prepare a positive electrode plate;
uniformly coating the negative slurry on the surface of the copper foil through a negative automatic coating machine, and automatically cutting after automatic drying to prepare a negative pole piece;
s4, winding assembly
Winding and injecting electrolyte into the positive pole piece, the first diaphragm, the negative pole piece and the second diaphragm from top to bottom, and then sealing and welding the positive pole piece and the negative pole piece to finish the assembly process of the battery to obtain a finished battery;
the electrolyte comprises a solute and a solvent, wherein the solute is one or more of lithium perchlorate, lithium hexafluorophosphate and lithium tetrafluoroborate, and the solvent is one or more of diethyl ether, ethylene carbonate, propylene carbonate and diethyl carbonate.
S5 test screening
And placing the finished product battery in a test cabinet for charge and discharge test, and screening out qualified finished product batteries.
Example 3:
the invention discloses a preparation process of a lithium battery based on a carbon-coated aluminum foil, which comprises the following steps:
s1 preparation of positive and negative electrode slurry
Mixing and uniformly stirring a positive electrode main material, a positive electrode solvent and a positive electrode binder to prepare a positive electrode slurry;
specifically, the main material of the positive electrode is lithium iron phosphate, and the positive electrode binder is one or more of polytetrafluoroethylene, polyacrylonitrile, styrene butadiene rubber and sodium carboxymethylcellulose.
The mass percentages of the anode main material, the anode solvent and the anode binder are as follows: 76% of a positive electrode main material, 22.5% of a positive electrode solvent and 1.5% of a positive electrode binder.
Mixing and uniformly stirring the negative electrode main material, the negative electrode solvent and the negative electrode binder to prepare negative electrode slurry;
specifically, the negative electrode main material is titanate, and the negative electrode binder is one or more of polyvinylidene fluoride, styrene butadiene rubber, polyacrylonitrile and polyacrylate.
The mass percentages of the negative electrode main material, the negative electrode solvent and the negative electrode binder are as follows: 77% of negative electrode main material, 19% of negative electrode solvent and 4% of negative electrode binder
S2 preparation of carbon-coated aluminum foil
Uniformly mixing the nano conductive graphite and the carbon-coated particles to form a carbon mixture, and grinding the carbon mixture into carbon mixture powder;
heating the optical aluminum foil, uniformly and finely coating carbon mixture powder on the optical aluminum foil at the temperature of 490 ℃, then increasing the temperature of the optical aluminum foil to 655 ℃, naturally cooling, and cleaning redundant carbon mixture powder on the surface of the optical aluminum foil to finish the preparation of the carbon-coated aluminum foil;
wherein, 660 degrees are metallic aluminum's melting point, heat light aluminium foil to 655 degrees, and the aluminium molecule on the light aluminium foil is active, can produce intermolecular mixture with carbon mixture powder, for the effect of the conductive coating who guarantees to form, can also use the compression roller to roll, increases the degree that the molecule mixes, can ensure conductive coating's stability and durability, the condition that can not take place to drop.
Specifically, the thickness of the optical aluminum foil is 22 micrometers, the thickness is slightly thinner than that of the conventional aluminum foil, the alloy number of the optical aluminum foil is one of 1060, 1050, 1145 and 1235, and the work hardening state of the optical aluminum foil is one of-O, H14, -H24, -H22 and-H18.
The mass percentages of the nano conductive graphite and the carbon-coated particles are as follows: 60% of nano conductive graphite, 40% of carbon coated particles and 0.3 micron of maximum outer diameter of particles in the carbon mixture powder, so that a good conductive coating can be formed.
The advantages of the carbon-coated aluminum foil in the application of the lithium ion battery include: the processing performance of lithium iron phosphate and lithium titanate materials is improved; the adhesive force of the active substance and the current collector is improved, and the manufacturing cost of the pole piece is reduced; battery polarization is inhibited, thermal effect is reduced, and rate capability is improved; the consistency is improved, and the cycle life of the battery is prolonged; protecting the current collector from being corroded by the electrolyte; the internal resistance of the battery is reduced, and the dynamic internal resistance amplification in the circulation process is obviously reduced.
S3 preparation of positive and negative electrode plates
Uniformly coating the positive electrode slurry on the surface of the carbon-coated aluminum foil through a positive electrode automatic coating machine, and automatically cutting after automatic drying to prepare a positive electrode plate;
uniformly coating the negative slurry on the surface of the copper foil through a negative automatic coating machine, and automatically cutting after automatic drying to prepare a negative pole piece;
s4, winding assembly
Winding and injecting electrolyte into the positive pole piece, the first diaphragm, the negative pole piece and the second diaphragm from top to bottom, and then sealing and welding the positive pole piece and the negative pole piece to finish the assembly process of the battery to obtain a finished battery;
the electrolyte comprises a solute and a solvent, wherein the solute is one or more of lithium perchlorate, lithium hexafluorophosphate and lithium tetrafluoroborate, and the solvent is one or more of diethyl ether, ethylene carbonate, propylene carbonate and diethyl carbonate.
S5 test screening
And placing the finished product battery in a test cabinet for charge and discharge test, and screening out qualified finished product batteries.
The finished cells prepared in examples 1, 2 and 3 can be used in different practical environments, such as: the finished battery prepared in the embodiment 1 is suitable for electronic equipment with small volume, such as a mobile phone, a tablet personal computer and the like, the finished battery prepared in the embodiment 2 is suitable for electronic equipment with large volume, such as an electric automobile, and the finished battery prepared in the embodiment 1 is suitable for electronic equipment with medium volume, such as an electric bicycle.
According to the technical scheme, the invention has the following beneficial effects:
the carbon-coated aluminum foil can provide excellent static conductivity, and can greatly reduce the contact resistance between the cathode material and the carbon-coated aluminum foil, thereby reducing the internal resistance of the battery, improving the adhesion capacity between the cathode material and the carbon-coated aluminum foil, reducing the usage amount of the binder and further obviously improving the overall performance of the lithium battery.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A preparation process of a lithium battery based on a carbon-coated aluminum foil is characterized by comprising the following steps:
s1 preparation of positive and negative electrode slurry
Mixing and uniformly stirring a positive electrode main material, a positive electrode solvent and a positive electrode binder to prepare a positive electrode slurry;
mixing and uniformly stirring the negative electrode main material, the negative electrode solvent and the negative electrode binder to prepare negative electrode slurry;
s2 preparation of carbon-coated aluminum foil
Uniformly mixing the nano conductive graphite and the carbon-coated particles to form a carbon mixture, and grinding the carbon mixture into carbon mixture powder;
heating the optical aluminum foil, uniformly and finely coating carbon mixture powder on the optical aluminum foil at the temperature of 400-580 ℃, then increasing the temperature of the optical aluminum foil to 650-660 ℃, naturally cooling, and cleaning redundant carbon mixture powder on the surface of the optical aluminum foil to finish the preparation of the carbon-coated aluminum foil;
s3 preparation of positive and negative electrode plates
Uniformly coating the positive electrode slurry on the surface of the carbon-coated aluminum foil through a positive electrode automatic coating machine, and automatically cutting after automatic drying to prepare a positive electrode plate;
uniformly coating the negative slurry on the surface of the copper foil through a negative automatic coating machine, and automatically cutting after automatic drying to prepare a negative pole piece;
s4, winding assembly
Winding and injecting electrolyte into the positive pole piece, the first diaphragm, the negative pole piece and the second diaphragm from top to bottom, and then sealing and welding the positive pole piece and the negative pole piece to finish the assembly process of the battery to obtain a finished battery;
s5 test screening
And placing the finished product battery in a test cabinet for charge and discharge test, and screening out qualified finished product batteries.
2. The process of claim 1, wherein in S1, the main material of the positive electrode is lithium iron phosphate, and the positive electrode binder is one or more of polytetrafluoroethylene, polyacrylonitrile, styrene butadiene rubber, and sodium carboxymethylcellulose.
3. The process for preparing a lithium battery based on a carbon-coated aluminum foil according to claim 1 or 2, wherein in S1, the mass percentages of the positive electrode main material, the positive electrode solvent and the positive electrode binder are as follows: 72-78% of a positive electrode main material, 21-29% of a positive electrode solvent and 1-2% of a positive electrode binder.
4. The process of claim 1, wherein in S1, the negative electrode main material is titanate, and the negative electrode binder is one or more of polyvinylidene fluoride, styrene butadiene rubber, polyacrylonitrile and polyacrylate.
5. The process for preparing a lithium battery based on a carbon-coated aluminum foil according to claim 1 or 4, wherein in S1, the mass percentages of the negative electrode main material, the negative electrode solvent and the negative electrode binder are as follows: 74-85% of a negative electrode main material, 18-20% of a negative electrode solvent and 2-6% of a negative electrode binder.
6. The process of claim 1, wherein in step S2, the optical aluminum foil has a thickness of 9-35 μm.
7. The process of claim 1 or 6, wherein in S2, the alloy designation of the optical aluminum foil is one of 1060, 1050, 1145 and 1235, and the work-hardened state of the optical aluminum foil is one of-O, H14, -H24, -H22 and-H18.
8. The process for preparing a lithium battery based on a carbon-coated aluminum foil as claimed in claim 1, wherein in S2, the mass percentages of the nano conductive graphite and the carbon-coated particles are as follows: 50-70% of nano conductive graphite and 30-50% of carbon-coated particles.
9. The process of claim 1 or 8, wherein in the step S2, the largest outer diameter of the particles in the carbon mixture powder is 0.1-0.5 μm.
10. The process of claim 1, wherein in step S4, the electrolyte comprises a solute and a solvent, the solute is one or more of lithium perchlorate, lithium hexafluorophosphate and lithium tetrafluoroborate, and the solvent is one or more of diethyl ether, ethylene carbonate, propylene carbonate and diethyl carbonate.
CN202110332897.8A 2021-03-29 2021-03-29 Preparation process of lithium battery based on carbon-coated aluminum foil Pending CN113140733A (en)

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CN114335707A (en) * 2021-11-22 2022-04-12 佛山(华南)新材料研究院 All-solid-state battery and preparation method thereof
CN115117366A (en) * 2022-08-29 2022-09-27 天津凯普瑞特新能源科技有限公司 Carbon-coated aluminum foil, manufacturing process thereof and lithium ion battery
CN116154179A (en) * 2023-02-16 2023-05-23 上海顶皓新材料科技有限公司 Carbon-coated aluminum foil and preparation method and application thereof

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CN116154179A (en) * 2023-02-16 2023-05-23 上海顶皓新材料科技有限公司 Carbon-coated aluminum foil and preparation method and application thereof

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