CN117276473A - Battery pole piece, preparation method thereof, battery monomer, battery and power utilization device - Google Patents

Battery pole piece, preparation method thereof, battery monomer, battery and power utilization device Download PDF

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Publication number
CN117276473A
CN117276473A CN202210663165.1A CN202210663165A CN117276473A CN 117276473 A CN117276473 A CN 117276473A CN 202210663165 A CN202210663165 A CN 202210663165A CN 117276473 A CN117276473 A CN 117276473A
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China
Prior art keywords
surface tension
slurry
battery
current collector
low surface
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CN202210663165.1A
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Chinese (zh)
Inventor
曹宇
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Weilai Automobile Technology Anhui Co Ltd
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Weilai Automobile Technology Anhui Co Ltd
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Priority to CN202210663165.1A priority Critical patent/CN117276473A/en
Publication of CN117276473A publication Critical patent/CN117276473A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

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

Abstract

The invention relates to a preparation method of a battery pole piece, a battery monomer, a battery and an electric device. The preparation method of the battery pole piece comprises the following steps: providing a current collector, and preparing a low surface tension point on the surface of the current collector; preparing slurry; and coating the slurry on the surface of the current collector, wherein the low surface tension point is recessed to form a required hole under the action of a surface tension gradient generated by the slurry. The electrolyte is stretched in the peripheral direction by taking the low surface tension point as the center, so that the electrolyte can be concaved around the low surface tension point to form required holes, and the preparation of the holes is beneficial to improving the electrolyte infiltration speed, relieving the stress expansion cracking of the electrode and improving the dynamic performance. Compared with the prior art, the method has the advantages that dust and waste gas are not generated in the hole preparation process, harm to the environment and personnel is avoided, the manufacturing cost is not increased, the hole forming processing difficulty is low, the feasibility is high, and the hole forming quality is good in controllability.

Description

Battery pole piece, preparation method thereof, battery monomer, battery and power utilization device
Technical Field
The invention relates to the technical field of lithium battery processing, in particular to a battery pole piece, a preparation method thereof, a battery monomer, a battery and an electricity utilization device.
Background
With the development of the electric automobile industry, consumers put higher and higher requirements on the endurance mileage of the electric automobile, correspondingly, manufacturers are sensitive to the cost of the power battery, and in order to improve the endurance mileage and reduce the cost of the power battery, one effective measure is to improve the energy density of the power battery, wherein the thick coating electrode is one of the main means for improving the energy density of the power battery.
However, as the thickness of the electrode coating increases, the processing difficulty increases accordingly. In particular, during coating, the pole piece is easy to crack; when the electrolyte is injected, the electrolyte soaking time can be greatly increased due to the large coating thickness of the electrode, and meanwhile, the dynamic performance of the battery cell can be correspondingly reduced along with the increase of the electrode coating thickness, so that the battery cell can not be charged and discharged in a large multiplying power, and the dynamic performance is difficult to meet the requirements of the current power battery.
In view of the above, a method for improving the electrolyte infiltration rate, relieving the stress expansion cracking of the electrode and improving the dynamic performance by manufacturing uniformly distributed pores on the surface of the electrode has been proposed. When the method is used for pore-forming, laser pore-forming, mechanical pore-forming or pore-forming agent pore-forming is generally adopted, but a large amount of dust is generated in the laser pore-forming and mechanical pore-forming processes, so that the production efficiency and the production environmental sanitation are affected; the pore spacing and the pore diameter of pore-forming agent pore-forming are difficult to control, a large amount of waste gas can be generated during decomposition of the pore-forming agent, the recovery treatment cost of the waste gas is high, and potential hazards exist for the environment and personnel.
Disclosure of Invention
Based on the above, it is necessary to provide a battery pole piece, a preparation method thereof, a battery monomer, a battery and an electricity utilization device, and the battery pole piece aims to solve the problems of harm to the environment and personnel, and poor production efficiency and processing quality controllability in the prior art.
In one aspect, the present application provides a method for preparing a battery pole piece, which includes the following steps:
providing a current collector, and preparing a low surface tension point on the surface of the current collector;
preparing slurry;
and coating the slurry on the surface of the current collector, wherein the low surface tension point is recessed to form a required hole under the action of a surface tension gradient generated by the slurry.
In order to improve the electrolyte infiltration speed, alleviate the electrode stress expansion cracking and improve the dynamic performance, when the preparation method of the battery pole piece is adopted to process holes of the battery pole piece, firstly, low surface tension points are prepared on the surface of a current collector, then or simultaneously, slurry preparation is carried out, finally, slurry is coated on the surface of the current collector and covers the low surface tension points, at the moment, a low surface tension area is formed around the low surface tension points, the slurry in the low surface tension area is stretched towards the peripheral direction by taking the low surface tension points as the center under the action of a surface tension gradient, so that the holes can be concaved around the low surface tension points to form the needed holes, and the preparation of the holes is favorable for improving the electrolyte infiltration speed, relieving the electrode stress expansion cracking and improving the dynamic performance. Compared with the prior art, the method has the advantages that dust and waste gas are not generated in the hole preparation process, harm to the environment and personnel is avoided, the manufacturing cost is not increased, the hole forming processing difficulty is low, the feasibility is high, and the hole forming quality is good in controllability.
The technical scheme of the application is further described below:
in one embodiment, in the step of preparing low surface tension points on the surface of the current collector, a plurality of the low surface tension points are prepared, and the plurality of the low surface tension points are uniformly distributed.
In one embodiment, in the step of recessing the low surface tension point under the surface tension gradient generated by the slurry to form a desired pore, the pore size of the pore is determined by the following quantitative relationship:
wherein r is the radius of the hole; t is the time of forming holes by recessing; h is the thickness of the slurry coating; mu is the viscosity of the slurry; dσ/dx is the surface tension gradient.
In one embodiment, in the step of recessing the low surface tension point to form a desired hole under the action of a surface tension gradient generated by the slurry, a flow rate of the slurry flowing out of a center of the low surface tension point is set to q, a coating thickness of the slurry is set to h, a viscosity of the slurry is set to μ, and the surface tension gradient generated by the slurry is dσ/dx, and the following quantitative relation exists:
in one embodiment, in the step of preparing a low surface tension point on the surface of the current collector, the low surface tension point is inactive material particles formed on the surface of the current collector in a spraying manner; or the low surface tension point is a convex structure or a concave structure manufactured on the surface of the current collector by adopting a machining means.
In one embodiment, in the step of preparing the slurry, specifically, the ternary cathode material, the binder, the conductive agent and the NMP solvent are mixed and stirred, wherein the mass ratio of the ternary cathode material to the binder to the conductive agent is 80-98%: 1% -10%: 1% -10%; the solid content of the slurry is 50% -80%.
In one embodiment, in the step of applying the slurry to the surface of the current collector, the slurry has a single-sided density of 130g/m applied to the surface of the current collector 2 ～270g/m 2 。
In one embodiment, the hole concavity is formed after the slurry coating and during the dry preparation period between the drying process.
In one embodiment, the diameter of the hole is 30-300 um; the holes are formed into a cylindrical-like or conical-like structure; the hole spacing between any two adjacent holes is 100-500 um.
On the other hand, the application also provides a battery pole piece, which is obtained by processing the preparation method of the battery pole piece.
In addition, the application also provides a battery cell, which comprises the battery pole piece.
In addition, the application also provides a battery, which comprises the battery cell.
In addition, the application also provides an electric device, which comprises the battery.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of steps of a method of making a battery pole piece of the present application;
FIG. 2 is a plan view of the current collector of the present application;
FIG. 3 is a schematic view of a partial enlarged structure at A in FIG. 2;
FIG. 4 is a block diagram showing the arrangement of a slurry coating and drying preparation section and a drying process in the present application;
FIG. 5 is a schematic diagram of the low surface tension point in the present application, which is concave to form holes under the action of surface gradient.
Reference numerals illustrate:
100. a current collector; 10. a low surface tension point; 200. a hole; 300. coating the slurry; 400. a drying procedure; 500. and (5) drying the preparation section.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, in the preparation method of a battery pole piece according to the embodiment of the present application, specifically, the battery pole piece to be prepared is a thick coating electrode, and the purpose of manufacturing the thick coating electrode is to correspondingly reduce the usage amount of copper foil, aluminum foil and diaphragm in the battery core when the coating thickness of the electrode is increased, so that the duty ratio of inactive substances in the battery core can be reduced, thereby improving the energy density of the battery core, and along with the improvement of the energy density, the watt-hour cost of the battery can be correspondingly reduced.
In addition, by adopting the thick coating electrode, the length of the pole piece used in the battery core can be greatly reduced, the efficiency of the corresponding battery core coating section can be improved, the production cost is reduced, and the carbon emission is reduced.
With continued reference to fig. 1 to 5, an exemplary method for preparing a battery pole piece specifically includes the following steps:
s100: a current collector 100 is provided and low surface tension points 10 are prepared on the surface of the current collector 100.
Alternatively, the current collector 100 may be any one of, but not limited to, copper foil, aluminum foil, nickel foil, stainless steel foil, etc., and is specifically selected according to actual needs.
S200: and (3) preparing slurry. The slurry is applied to the front and back sides of the current collector 100. The coating may be transfer coating or extrusion coating.
S300: the slurry is applied 300 to the surface of the current collector 100 and the low surface tension points 10 are recessed to form the desired holes 200 under the surface tension gradient created by the slurry.
In summary, implementing the technical scheme of the embodiment has the following beneficial effects: in order to improve the electrolyte infiltration speed, alleviate the electrode stress expansion cracking and improve the dynamic performance, when the preparation method of the battery pole piece adopting the scheme is adopted to process the hole 200 of the battery pole piece, firstly, the low surface tension point 10 is prepared on the surface of the current collector 100, then or simultaneously, the slurry is prepared, finally, the slurry is coated 300 on the surface of the current collector 100 and covers the low surface tension point 10, at this time, a low surface tension area is formed around the low surface tension point 10, the slurry in the low surface tension area is stretched towards the peripheral direction by taking the low surface tension point 10 as the center under the action of the surface tension gradient, so that the hole 200 can be concaved around the low surface tension point 10 to form the required hole 200, and the preparation of the hole 200 is beneficial to improving the electrolyte infiltration speed, alleviating the electrode stress expansion cracking and improving the dynamic performance. Compared with the prior art, dust and waste gas are not generated in the preparation process of the holes 200, so that the damage to the environment and personnel is avoided, the manufacturing cost is not increased, the hole forming processing difficulty is low, the feasibility is high, and the forming quality of the holes 200 is good in controllability.
Based on the above embodiment, in the step of recessing the low surface tension point 10 under the surface tension gradient generated by the slurry to form the desired holes 200, the pore size of the holes 200 is determined by the following quantitative relation:
wherein r is the radius of the hole 200; t is the time for recessing to form the hole 200; h is the thickness of the slurry coating 300; mu is the viscosity of the slurry; dσ/dx is the surface tension gradient.
Because the thickness h of the slurry coating 300, the viscosity mu of the slurry and the like are controllable factors, when the battery monomers with different types and parameters are prepared, the aperture of the hole 200 formed on the battery pole piece can be controlled according to actual needs, so that the control of the battery energy density is realized.
In addition, in the step of recessing the low surface tension point 10 to form the hole 200 by the surface tension gradient generated by the slurry on the basis of any of the above embodiments, the flow rate of the slurry flowing out of the center of the low surface tension point 10 is q, the coating thickness of the slurry is h, the viscosity of the slurry is μ, the surface tension gradient generated by the slurry is dσ/dx, and the following quantitative relation exists:
under the above quantitative relation, the speed of forming the holes 200 by recessing the low surface tension points 10 can be controlled, so that the hole forming speed of the battery pole piece can be adjusted according to the production tact.
With continued reference to fig. 2 and 3, in addition, in some embodiments, in the step of preparing the low surface tension points 10 on the surface of the current collector 100, a plurality of low surface tension points 10 are prepared, and the plurality of low surface tension points 10 are uniformly distributed.
When the slurry coating 300 is performed, it is ensured that all the low surface tension points 10 are covered by the slurry, so that a plurality of uniformly distributed holes 200 can be formed at the same time in the subsequent pore-forming stage, therefore, electrolyte can enter the holes 200 to better infiltrate the battery pole pieces during liquid injection, more electrolyte can be stored in the holes 200, and a standby lithium source is provided for lithium ions consumed by side reactions in the battery. Meanwhile, the holes 200 are uniformly distributed, so that the battery pole piece has uniform and better expansion and deformation capacity, and therefore the problem of stress expansion cracking of the battery pole piece is solved, in addition, the holes 200 can also greatly shorten ion transmission channels, and the dynamic performance is improved.
It should be noted that the uniform distribution structure of the low surface tension points 10 (i.e., the holes 200) may be an array structure, etc., and may be specifically selected according to practical needs, and is not particularly limited herein.
In this embodiment, the diameter of the hole 200 is 30um to 300um. Preferably, the diameter of the hole 200 is set to 100um in the present embodiment. In practice, the diameter of the holes 200 may be other values. The holes 200 are formed in a cylindrical-like or conical-like configuration. The holes 200 have regular structural shapes, which are more beneficial to electrolyte infiltration and shorten ion transmission channels.
In addition, the hole pitch of any two adjacent holes 200 is 100um to 500um. Preferably, the hole spacing between two adjacent holes 200 in this embodiment is 400um. Of course, the hole spacing may be other values in other embodiments, and will not be described in detail herein.
In some embodiments, in the step of preparing the low surface tension point 10 on the surface of the current collector 100, the low surface tension point 10 is inactive material particles formed on the surface of the current collector 100 by spraying; alternatively, the low surface tension spot 10 is a convex structure or a concave structure manufactured on the surface of the current collector 100 by a machining means.
By adopting the technical means, the low surface tension point 10 can be conveniently and efficiently prepared on the surface of the current collector 100, the processing difficulty is low, and the feasibility is strong. Wherein, the inactive substance particles have nano or micron size and are common binders and dispersants such as CMC, PVDF, SBR, PAA.
The protruding structure or the recessed structure can be specifically any one of holes 200, embossments, lines and the like, and can be specifically selected according to actual needs. For example, in the case of the hole 200, the machining means may be drilling, punching, or the like.
In one embodiment, in the step of preparing the slurry, specifically, the ternary cathode material, the binder, the conductive agent and the NMP solvent are mixed and stirred, wherein the mass ratio of the ternary cathode material to the binder to the conductive agent is 80-98%: 1% -10%: 1% -10%; the solid content of the slurry is 50-80%.
The slurry prepared by the material proportion has stable chemical property and moderate viscosity, and the holes 200 can be prepared by a surface tension gradient shrinkage method with the low surface tension point 10 as a base point better when the slurry is coated on the surface of the current collector 100. Of course, other variations of the types and mass ratios of materials described above are possible in other embodiments.
In this embodiment, the ternary positive electrode material is specifically an NCM ternary positive electrode material.
The conductive agent can be any one or a combination of at least two of super P, ketjen black, acetylene black, single-walled carbon nanotubes, multi-walled carbon nanotubes, single-layered graphene, multi-layered graphene, conductive carbon fibers, MXene and the like.
The binder may be one or a combination of at least two of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), sodium Alginate (SA), guar Gum (GG), chitosan-based binder (CCTS), polyacrylic acid (salt) -based binder (PAA), polyacrylonitrile-based binder (PAN), polyvinyl alcohol-based binder (PVA), polyimide-based binder (PI), polyethylene oxide (PEO), polymethyl methacrylate (PMMA), and the like.
The NMP solvent may be any one or a combination of at least two of deionized water, alcohol, N-methylpyrrolidone (NMP solvent), and the like.
In some embodiments, in the step of applying 300 the slurry to the surface of the current collector 100, the slurry has a coated single-sided areal density of 130g/m on the surface of the current collector 100 2 ～270g/m 2 . Thus, the slurry coating 300 is sufficient in amount to facilitate the formation of the desired coating thickness and to meet the surface tension gradient requirements for pore formation.
With continued reference to fig. 4, in this embodiment, the holes 200 are recessed after the slurry coating 300 and during the dry preparation stage 500 between the drying process 400. The formation of holes 200 by shrinkage of the low surface tension spot 10 is further facilitated after the slurry coating 300 and before the battery pole piece is fed into the drying process 400 (i.e., into the oven).
Then the mixture is sent into a drying procedure 400, the drying temperature is 35-165 ℃, and the drying time is 1-40 h. Thus, the finished product of the battery pole piece with the required coating thickness can be obtained.
After the drying process, the battery pole piece is further subjected to a roll-pressing process to improve the connection strength of the coating layer and the current collector 100.
In summary, the present application provides a battery pole piece, which is obtained by processing the above preparation method of the battery pole piece.
In addition, the application also provides an electric device, which comprises the battery. The electric device can be an electric automobile, a household appliance or the like. The battery comprises the battery cell. I.e. the battery comprises at least one cell. In practical use, in order to improve the energy of the battery, improve the power supply capacity and ensure the cruising performance of the power utilization device, a plurality of battery monomers are generally used in combination, and all the battery monomers are connected into a whole in a serial or parallel mode. The battery cell comprises the battery pole piece.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims (10)

1. The preparation method of the battery pole piece is characterized by comprising the following steps:
providing a current collector, and preparing a low surface tension point on the surface of the current collector;
preparing slurry;
and coating the slurry on the surface of the current collector, wherein the low surface tension point is recessed to form a required hole under the action of a surface tension gradient generated by the slurry.
2. The method of manufacturing a battery pole piece according to claim 1, wherein in the step of manufacturing low surface tension points on the surface of the current collector, a plurality of the low surface tension points are manufactured, and the plurality of the low surface tension points are uniformly distributed.
3. The method of claim 1, wherein in the step of recessing the low surface tension point under the surface tension gradient generated by the slurry to form a desired hole, the size of the hole is determined by the following quantitative relation:
wherein r is the radius of the hole; t is the time of forming holes by recessing; h is the thickness of the slurry coating; mu is the viscosity of the slurry; dσ/dx is the surface tension gradient.
4. The method according to claim 1, wherein in the step of recessing the low surface tension point to form a desired hole by a surface tension gradient generated by the slurry, a flow rate of the slurry flowing out of a center of the low surface tension point is set to q, a coating thickness of the slurry is set to h, a viscosity of the slurry is set to μ, and a surface tension gradient generated by the slurry is d σ/dx, and there is the following quantitative relation:
5. the method for preparing a battery pole piece according to claim 1, wherein in the step of preparing a low surface tension point on the surface of the current collector, the low surface tension point is inactive material particles formed on the surface of the current collector by spraying; or the low surface tension point is a convex structure or a concave structure manufactured on the surface of the current collector by adopting a machining means.
6. The method for preparing a battery pole piece according to claim 1, wherein in the step of preparing slurry, a ternary positive electrode material, a binder, a conductive agent and an NMP solvent are mixed and stirred, wherein the mass ratio of the ternary positive electrode material to the binder to the conductive agent is 80-98%: 1% -10%: 1% -10%; the solid content of the slurry is 50% -80%; or alternatively
In the step of applying the slurry to the surface of the current collector, the slurry has a single-sided surface density of 130g/m applied to the surface of the current collector 2 ～270g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
The hole recess is formed after the slurry is coated and during the drying preparation period between the drying procedures; or alternatively
The diameter of the hole is 30-300 um; the holes are formed into a cylindrical-like or conical-like structure; the hole spacing between any two adjacent holes is 100-500 um.
7. A battery pole piece, characterized in that it is obtained by processing the battery pole piece according to any one of claims 1 to 6.
8. A battery cell comprising the battery pole piece of claim 7.
9. A battery comprising the battery cell of claim 8.
10. An electrical device comprising the battery of claim 9.
CN202210663165.1A 2022-06-13 2022-06-13 Battery pole piece, preparation method thereof, battery monomer, battery and power utilization device Pending CN117276473A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210663165.1A CN117276473A (en) 2022-06-13 2022-06-13 Battery pole piece, preparation method thereof, battery monomer, battery and power utilization device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210663165.1A CN117276473A (en) 2022-06-13 2022-06-13 Battery pole piece, preparation method thereof, battery monomer, battery and power utilization device

Publications (1)

Publication Number Publication Date
CN117276473A true CN117276473A (en) 2023-12-22

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