CN112234164A - Lithium battery pole piece and preparation method thereof - Google Patents
Lithium battery pole piece and preparation method thereof Download PDFInfo
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- CN112234164A CN112234164A CN202011311685.3A CN202011311685A CN112234164A CN 112234164 A CN112234164 A CN 112234164A CN 202011311685 A CN202011311685 A CN 202011311685A CN 112234164 A CN112234164 A CN 112234164A
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides a lithium battery pole piece and a preparation method thereof, wherein the lithium battery pole piece comprises: a current collector; the carbon coating is positioned on the surface of the current collector, and the surface of the carbon coating is provided with a plurality of protrusions and depressions which are randomly distributed; and the active material layer is positioned on the surface of the carbon coating layer far away from the current collector. According to the lithium ion battery, the carbon coating with a plurality of protrusions and depressions distributed randomly is formed between the current collector and the active material layer, so that the interface bonding strength and the electric contact between the active material layer and the current collector can be obviously improved, and the comprehensive performance of the lithium ion battery is improved.
Description
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a lithium battery pole piece and a preparation method thereof.
Background
Because the lithium ion battery has the advantages of high energy density, high voltage, stable discharge voltage, cleanness, environmental protection and the like, the lithium ion battery is applied to energy storage products in various fields. Meanwhile, with the demand of consumers for long service life, high energy density and rapid charging capability of electric equipment in various industries in recent years, research and development personnel in the world continuously improve active materials, electrode design and battery design, so as to meet the requirements of electronic equipment and power automobiles.
The lithium ion battery completes the storage and discharge work mainly by the release and the insertion of lithium ions between the anode and the cathode. In the charging and discharging process, because lithium ions are repeatedly desorbed and inserted in the active material, the interface contact between the electrode material layer and the current collector is deteriorated, and finally the material falls off from the current collector, so that the capacity attenuation, the cycle life deterioration and the rate capability reduction of the lithium battery are caused.
In order to give consideration to both the long cycle life and the high-rate charge-discharge performance of a high-energy-density lithium ion battery, a new design is urgently needed to solve the problem.
Disclosure of Invention
The technical problem to be solved by the application is to provide a lithium battery pole piece and a preparation method thereof, which can improve the cycle performance and the charge and discharge performance of a lithium battery.
In order to solve the above technical problem, the present application provides a lithium battery pole piece, including: a current collector; the carbon coating is positioned on the surface of the current collector, and the surface of the carbon coating is provided with a plurality of protrusions and depressions which are randomly distributed; and the active material layer is positioned on the surface of the carbon coating layer far away from the current collector.
In an embodiment of the present application, the carbon coating layer comprises at least two different particle size conductive carbon materials, wherein the smaller particle size conductive carbon material has an average particle size between 10nm and 200nm and the larger particle size conductive carbon material has an average particle size between 1 μm and 10 μm.
In the embodiment of the application, the mass fraction of the conductive carbon material with larger particle size is 20-50%, and the mass fraction of the conductive carbon material with smaller particle size is 50-80%, based on the total mass of the conductive carbon material as 100%.
In an embodiment of the present application, the conductive carbon material includes at least one of carbon black, ketjen black, acetylene black, carbon fiber, carbon nanotube, conductive graphite, graphene.
In an embodiment of the application, the carbon coating further comprises a binder, and the mass fraction of the conductive carbon material is 70-99% and the mass fraction of the binder is 1-30% based on 100% of the total mass of the carbon coating.
In the examples of the present application, the carbon coating layer has a thickness of 0.1 to 10 μm.
In the embodiment of the present application, the thickness of the current collector is 1 μm to 30 μm.
In order to solve the above technical problem, the present application further provides a method for manufacturing a lithium battery pole piece, including: providing a current collector; coating conductive carbon coating liquid on the surface of the current collector to form a carbon coating, wherein the surface of the carbon coating is provided with a plurality of protrusions and depressions which are randomly distributed; and forming an active material layer on the surface of the carbon coating.
In an embodiment of the present application, the carbon coating layer comprises at least two different particle size conductive carbon materials, wherein the smaller particle size conductive carbon material has an average particle size between 10nm and 200nm and the larger particle size conductive carbon material has an average particle size between 1 μm and 10 μm.
The mass fraction of the conductive carbon material with larger particle size is 20-50%, and the mass fraction of the conductive carbon material with smaller particle size is 50-80%, wherein the total mass of the conductive carbon material is 100%.
Compared with the prior art, the technical scheme of the application has the following beneficial effects:
the lithium battery pole piece of this application technical scheme preparation, including mass flow body, carbon coating and active material layer, wherein carbon coating adopts the electrically conductive carbon material of different particle diameters and appearance to form, makes carbon coating surface has a plurality of random distribution's arch and sunken, has improved the adhesive force of pole piece to the active material layer on the one hand, on the other hand carbon coating has great specific surface area and good electric conductivity, consequently can increase the pole piece and to the liquid retention performance of electrolyte and the electron rate of pole piece to increase the quick charge ability of pole piece.
The conductive carbon material has good flexibility, so that the conductive carbon material can play a role in volume buffering an active material in a volume expansion process caused by lithium ion deintercalation, reduce the contact resistance between the active material and a current collector caused by volume expansion, and improve the cycle performance and safety performance of the lithium battery.
Drawings
The following drawings describe in detail exemplary embodiments disclosed in the present application. Wherein like reference numerals represent similar structures throughout the several views of the drawings. Those of ordinary skill in the art will understand that the present embodiments are non-limiting, exemplary embodiments and that the accompanying drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of the present application, as other embodiments may equally fulfill the inventive intent of the present application. It should be understood that the drawings are not to scale. Wherein:
fig. 1 is a schematic structural diagram of a lithium battery pole piece according to an embodiment of the present application.
Detailed Description
The following description is presented to enable any person skilled in the art to make and use the present disclosure, and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present application. Thus, the present application is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the claims.
The technical solution of the present application will be described in detail below with reference to the embodiments and the accompanying drawings.
Referring to fig. 1, a lithium battery electrode sheet according to an embodiment of the present application includes a current collector 1, a carbon coating layer 2, and an active material layer 3. The current collector 1 may be a copper foil current collector, an aluminum foil current collector, or a current collector made of other materials. The thickness of the current collector is 1-30 μm.
The carbon coating 2 comprises conductive carbon materials with different particle sizes and morphologies, on one hand, the conductive carbon materials have better flexibility, so that the conductive carbon materials can play a role in volume buffering on active materials in the charging and discharging processes (lithium ions can be subjected to deintercalation and volume expansion in the charging and discharging processes), the contact resistance between the active materials and a current collector caused by the volume expansion is reduced, and the cycle performance and the safety performance of the lithium battery are improved; on the other hand, the conductive carbon materials with different particle sizes and morphologies enable the carbon coating 2 to have protrusions and depressions, so that the surface of the carbon coating 2 has a larger specific surface area and good electric conductivity, and the liquid retention performance of the pole piece on the electrolyte and the electron rate of the pole piece are increased, thereby increasing the quick charging capability of the pole piece.
In some embodiments, the carbon coating 2 includes at least two different particle size conductive carbon materials, wherein the smaller particle size conductive carbon material has an average particle size between 10nm and 200nm and the larger particle size conductive carbon material has an average particle size between 1 μm and 10 μm. The particle size of the conductive carbon material is reasonably designed, so that the compaction density and the stock solution amount of the pole piece can be adjusted, and the long cycle life of the pole piece is ensured.
The mass fraction of the conductive carbon material with larger particle size is 20-50%, and the mass fraction of the conductive carbon material with smaller particle size is 50-80%, wherein the total mass of the conductive carbon material is 100%.
The conductive carbon material comprises at least one of carbon black, ketjen black, acetylene black, carbon fiber, carbon nanotube, conductive graphite and graphene.
In some embodiments, the conductive carbon material comprises carbon black and conductive graphite, wherein the carbon black has an average particle size of 10nm to 200nm and the graphite conductive agent has a particle size of 1 μm to 10 μm.
In some embodiments, the carbon coating 2 further comprises a binder that functions to bind the conductive carbon material. The mass fraction of the conductive carbon material is 70-99%, and the mass fraction of the binder is 1-30% based on 100% of the total mass of the carbon coating. The binder may include at least one of polyvinylidene fluoride, sodium carboxymethylcellulose, styrene butadiene rubber for lithium batteries, polyacrylic acids, polyvinyl alcohol, polyacrylonitrile, sodium alginate, chitosan, polyimide, polyvinyl ether, polyallylamine, polyurethane, polytetrafluoroethylene, 9-dioctylfluorene-co-fluorenone-co-methylbenzoic acid.
The active material layer 3 is located on the carbon coating layer 2 away from the surface of the current collector 1, and the active material layer may include an active material, a conductive agent and a binder, wherein the active material may include common active materials, such as a silicon carbon material, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium nickel manganese aluminate, lithium nickel cobalt manganese aluminate, lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium manganese rich, and the like. The conductive agent comprises one or a mixture of more of conductive carbon black SP, Ketjen black ECP, conductive graphite KS, carbon nanotubes and carbon nanofibers. The binder includes, for example, a CMC cement or an SBR binder.
The embodiment of the application also provides a preparation method of the lithium battery pole piece, which comprises the following steps:
step S1: providing a current collector;
step S2: coating conductive carbon coating liquid on the surface of the current collector to form a carbon coating, wherein the surface of the carbon coating is provided with a plurality of protrusions and depressions which are randomly distributed;
step S3: and forming an active material layer on the surface of the carbon coating.
In step S1, the current collector 1 may be a copper foil current collector, an aluminum foil current collector, or a current collector made of other materials. The thickness of the current collector is 1-30 μm.
In step S2, the conductive carbon coating liquid includes conductive carbon materials with different particle sizes and a binder, and the conductive carbon material accounts for 70% to 99% of the total mass of the conductive carbon coating liquid, and the binder accounts for 1% to 30% of the total mass of the conductive carbon coating liquid.
The conductive carbon coating liquid comprises at least two conductive carbon materials with different particle sizes, wherein the mass fraction of the conductive carbon material with the larger particle size is 20-50%, the mass fraction of the conductive carbon material with the smaller particle size is 50-80%, the average particle size of the conductive carbon material with the smaller particle size is 10-200 nm, the average particle size of the conductive carbon material with the larger particle size is 1-10 μm, and the viscosity of the conductive carbon coating liquid is 800-8000 mPa-s, wherein the total mass of the conductive carbon materials is 100%. Because the conductive carbon coating liquid comprises conductive carbon materials with different particle sizes, the surface of the formed carbon coating layer, which is in contact with the current collector, is provided with a plurality of protrusions and depressions which are randomly distributed.
The conductive carbon coating solution can be coated by one or more of extrusion coating, transfer coating, blade coating, hot pressing, electrostatic spraying, plasma spraying, vacuum coating and scraper coating.
In some embodiments, the coated conductive carbon coating liquid is baked, dried and rolled to form a carbon coating, wherein the baking temperature is 70-120 ℃ and the baking time is 3 minutes to 15 hours. The thickness of the carbon coating is 0.1-10 mu m, and the single-side surface density is 0.1g/m2～10g/m2。
The technical solution of the present application is further illustrated by the following specific examples.
Example 1
(1) Uniformly mixing carbon black with the particle size (D50) of 40nm and spherical graphite with the particle size of 3.4 mu m according to the mass ratio of 7: 3, then mixing the mixed composite conductive agent with CMC and SBR according to the mass ratio of 95: 2: 3, fully stirring to prepare slurry with the viscosity of 1200mPa & s, uniformly coating the slurry on a negative current collector (copper foil) in a transfer coating mode, then baking the negative current collector with a carbon coating at 80 ℃ for 30min, then rolling the negative current collector, and obtaining the negative current collector with the carbon coating with the thickness of 4 mu m after rolling.
(2) Preparing 400mAh/g of silicon carbon material (Si/C), conductive agent SP and binder (CMC/SBR) into slurry, wherein the preparation ratio of Si/C to SP to CMC to SBR is 96: 1: 1.5, and then uniformly coating the slurry on the negative electrode current collector with the carbon coating prepared in the step (1) to prepare a negative electrode sheet with the thickness of 100 mu m.
Example 2
Uniformly mixing carbon black with the particle size (D50) of 40nm and spherical graphite with the particle size of 3.4 mu m according to the mass ratio of 5: 5, then mixing the mixed composite conductive agent with CMC and SBR according to the mass ratio of 95: 2: 3, fully stirring to prepare slurry with the viscosity of 1200mPa & s, uniformly coating the slurry on a negative current collector (copper foil) in a transfer coating mode, then baking the negative current collector with a carbon coating at 80 ℃ for 30min, then rolling the negative current collector, and obtaining the negative current collector with the carbon coating with the thickness of 4 mu m after rolling. The other steps are the same as in example 1.
Example 3
Uniformly mixing carbon black with the particle size (D50) of 40nm and flake graphite with the particle size of 3.5 mu m according to the mass ratio of 7: 3, then mixing the mixed composite conductive agent with CMC and SBR according to the mass ratio of 95: 2: 3, fully stirring to prepare slurry with the viscosity of 1200mPa & s, uniformly coating the slurry on a negative current collector (copper foil) in a transfer coating mode, then baking the negative current collector with a carbon coating at 80 ℃ for 30min, then rolling the negative current collector, and obtaining the negative current collector with the carbon coating with the thickness of 2 mu m after rolling. The other steps are the same as in example 1. A
Example 4
(1) Carbon black having a particle diameter (D50) of 40nm and spherical graphite having a particle diameter of 3.4 μm were mixed in a ratio of 7: 3, uniformly mixing, adding the mixed composite conductive agent into a PVDF solution, fully stirring to prepare slurry with the viscosity of 1500mPa & s, uniformly coating the slurry on an aluminum foil in a transfer coating mode, baking the positive current collector with the carbon coating at 100 ℃ for 30min, rolling the positive current collector with the carbon coating, and preparing the positive current collector with the carbon coating, wherein the thickness of the coating layer after rolling is 4 microns.
(2) Preparing a ternary active material of NCM (811), a conductive agent SP and a binder PVDF into slurry, wherein the preparation ratio of NCM to SP to PVDF is 95: 2: 3, and then uniformly coating the slurry on the positive current collector with the carbon coating prepared in the step (1) to prepare a positive plate with the thickness of 90 mu m.
Example 5
Uniformly mixing carbon black with the particle size (D50) of 40nm and spherical graphite with the particle size of 2.3 mu m according to the ratio of 5: 5, adding the mixed composite conductive agent into a PVDF solution, fully stirring to prepare slurry with the viscosity of 1500mPa & s, uniformly coating the slurry on an aluminum foil in a transfer coating mode, baking a positive current collector with a carbon coating at 100 ℃ for 30min, rolling the positive current collector, and preparing the positive current collector with the carbon coating, wherein the thickness of the coating layer after rolling is 3 mu m. The other steps and conditions therein were in accordance with example 4.
Example 6
Uniformly mixing carbon black with the particle size (D50) of 40nm and spherical graphite with the particle size of 2.3 mu m according to the ratio of 7: 3, adding the mixed composite conductive agent into a PVDF solution, fully stirring to prepare slurry with the viscosity of 1500mPa & s, uniformly coating the slurry on an aluminum foil in a transfer coating mode, baking a positive current collector with a carbon coating at 100 ℃ for 30min, rolling the positive current collector, and preparing the positive current collector with the carbon coating, wherein the thickness of the coating layer after rolling is 3 mu m. The other steps and conditions therein were in accordance with example 4. The other steps and conditions therein were in accordance with example 4.
Comparative example 1
The comparative example 1 adopts the same manufacturing process and conditions as those of the examples 1 to 3, and is different from the comparative example 1 in that the current collector used in the comparative example 1 is a copper foil current collector which is not coated with a carbon coating.
Comparative example 2
In comparative example 2, the same production process and conditions as in examples 1 to 3 were used, except that the carbon coating layer of the current collector of comparative example 2 was the same carbon black having the same particle size (D50 ═ 40 nm).
Comparative example 3
In comparative example 3, the same manufacturing process and conditions as in examples 4 to 6 were used, except that the current collector used in comparative example 3 was an aluminum foil current collector which was not coated with a carbon coating.
Comparative example 4
Comparative example 4 used the same fabrication process and conditions as in examples 4-6, except that the carbon coating of the current collector of comparative example 4 was the same carbon black with the same particle size (D50 ═ 40 nm).
And (3) testing the peel strength of the pole piece:
the positive and negative pole pieces coated on the single surface are obtained in the examples 1-6 and the comparative examples 1-4, the peel strength and the resistivity of the pole pieces are tested, and the test results are shown in the following table 1.
And (3) testing the battery performance:
the pole pieces and the metal lithium pieces prepared in the examples 1 to 6 and the comparative examples 1 to 4 are respectively used as counter electrodes to assemble a button half cell, the charging capacity of the cell at 0.5C, 1C, 2C and 4C is tested, the capacity at 0.2C is 100%, and the test results are shown in the following table 2.
The capacity retention rate of the test battery after 500 weeks of cycle during 1C charge and discharge was measured as 100% of the capacity at the first week of the start of cycle, and the test results are shown in table 3 below.
TABLE 1 Peel Strength and resistivity results
As can be seen from Table 1, the resistivity of the positive and negative electrode plates coated with the carbon coating is better than that of the electrode plates not coated with the carbon coating; among the positive and negative electrode plates coated with the carbon coating, the electrode plate of the carbon coating formed by the conductive carbon materials with different particle sizes and morphologies has higher peel strength, because the conductive carbon materials with different particle sizes and morphologies enable the formed carbon coating to have higher roughness, so that the bonding strength between the active material layer and the current collector in the electrode plate is enhanced, and the peel strength of the whole electrode plate is improved.
TABLE 2 Capacity Retention Rate results
It can be seen from table 2 that the capacity retention rate of the battery with the carbon-coated pole piece is better than that of the battery without the carbon coating when the battery is charged with a large current, because the conductivity of the pole piece can be improved by the carbon coating when the battery is charged with a large current, and the liquid retention capacity of the pole piece can be improved by the large specific surface area of the carbon material in the carbon coating, so that the ionic conductivity of the battery is improved, and therefore, the charging capacity of the battery with the carbon-coated pole piece can reach the required capacity in a short time when the battery is charged with a large current.
TABLE 3 Capacity Retention for 500 weeks on cycling
As can be seen from table 3, the capacity retention rate of the battery with the carbon-coated pole piece after 500 cycles of 1C current cycle is significantly higher than that of the battery without the carbon-coated pole piece; among the batteries with the carbon coating, the batteries with the carbon coating formed by the conductive carbon materials with different particle sizes and morphologies have better capacity retention rate, because the carbon coating formed by the conductive carbon materials with different particle sizes and morphologies has an uneven surface, the bonding force between the carbon coating and the active material layer can be enhanced, thereby improving the phenomenon that the active material falls off on a current collector due to volume expansion of the active material layer in the charge-discharge cycle process, improving the battery capacity and prolonging the cycle life of the battery.
According to the technical scheme, the conductive carbon materials with different particle sizes and shapes are used to form the carbon coating with a plurality of protrusions and depressions distributed randomly on the surface, the carbon coating is located between the current collector and the active material layer, the interface bonding strength and the electric contact between the active material layer and the current collector can be obviously improved, and therefore the comprehensive performance of the lithium ion battery is improved.
In view of the above, it will be apparent to those skilled in the art upon reading the present application that the foregoing application content may be presented by way of example only, and may not be limiting. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, modifications, and variations are intended to be within the spirit and scope of the exemplary embodiments of this application.
It is to be understood that the term "and/or" as used herein in this embodiment includes any and all combinations of one or more of the associated listed items. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present.
Similarly, it will be understood that when an element such as a layer, region or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, the term "directly" means that there are no intervening elements. It will be further understood that the terms "comprises," "comprising," "includes" or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It will be further understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element in some embodiments may be termed a second element in other embodiments without departing from the teachings of the present application. The same reference numerals or the same reference characters denote the same elements throughout the specification.
Further, the present specification describes example embodiments with reference to idealized example cross-sectional and/or plan and/or perspective views. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, example embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have rounded or curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of exemplary embodiments.
Claims (10)
1. A lithium battery pole piece, comprising:
a current collector;
the carbon coating is positioned on the surface of the current collector, and the surface of the carbon coating is provided with a plurality of protrusions and depressions which are randomly distributed; and the number of the first and second groups,
an active material layer on a surface of the carbon coating remote from the current collector.
2. The lithium battery pole piece of claim 1, wherein the carbon coating comprises at least two different particle size conductive carbon materials, wherein the smaller particle size conductive carbon material has an average particle size between 10nm and 200nm, and the larger particle size conductive carbon material has an average particle size between 1 μ ι η and 10 μ ι η.
3. The lithium battery pole piece according to claim 2, wherein the mass fraction of the conductive carbon material with the larger particle size is 20 to 50%, and the mass fraction of the conductive carbon material with the smaller particle size is 50 to 80%, based on 100% of the total mass of the conductive carbon materials.
4. The lithium battery pole piece of claim 2, wherein the conductive carbon material comprises at least one of carbon black, ketjen black, acetylene black, carbon fiber, carbon nanotube, conductive graphite, graphene.
5. The lithium battery pole piece according to claim 2, wherein the carbon coating further comprises a binder, and the mass fraction of the conductive carbon material is 70-99% and the mass fraction of the binder is 1-30% based on 100% of the total mass of the carbon coating.
6. The lithium battery pole piece of claim 1, wherein the carbon coating has a thickness of 0.1 μm to 10 μm.
7. The lithium battery pole piece of claim 1, wherein the thickness of the current collector is 1 μm to 30 μm.
8. A preparation method of a lithium battery pole piece is characterized by comprising the following steps:
providing a current collector;
coating conductive carbon coating liquid on the surface of the current collector to form a carbon coating, wherein the surface of the carbon coating is provided with a plurality of protrusions and depressions which are randomly distributed;
and forming an active material layer on the surface of the carbon coating.
9. The method for preparing a lithium battery pole piece according to claim 8, wherein the carbon coating layer comprises at least two conductive carbon materials with different particle sizes, wherein the average particle size of the conductive carbon material with smaller particle size is between 10nm and 200nm, and the average particle size of the conductive carbon material with larger particle size is between 1 μm and 10 μm.
10. The method for preparing the lithium battery pole piece as claimed in claim 9, wherein the mass fraction of the conductive carbon material with the larger particle size is 20-50% and the mass fraction of the conductive carbon material with the smaller particle size is 50-80% based on 100% of the total mass of the conductive carbon materials.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114284504A (en) * | 2021-12-22 | 2022-04-05 | 上海恩捷新材料科技有限公司 | Composite current collector, preparation method thereof, pole piece thereof and battery |
| WO2023202374A1 (en) * | 2022-04-18 | 2023-10-26 | 宁德时代新能源科技股份有限公司 | Electrode plate and preparation method therefor, electrode assembly, battery cell, battery and electric device |
-
2020
- 2020-11-20 CN CN202011311685.3A patent/CN112234164A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114284504A (en) * | 2021-12-22 | 2022-04-05 | 上海恩捷新材料科技有限公司 | Composite current collector, preparation method thereof, pole piece thereof and battery |
| CN114284504B (en) * | 2021-12-22 | 2023-11-28 | 上海恩捷新材料科技有限公司 | Composite current collector, preparation method thereof, pole piece and battery |
| WO2023202374A1 (en) * | 2022-04-18 | 2023-10-26 | 宁德时代新能源科技股份有限公司 | Electrode plate and preparation method therefor, electrode assembly, battery cell, battery and electric device |
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