CN116995195A - Composite pole piece, preparation method thereof and lithium ion battery - Google Patents

Composite pole piece, preparation method thereof and lithium ion battery Download PDF

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Publication number
CN116995195A
CN116995195A CN202310931878.6A CN202310931878A CN116995195A CN 116995195 A CN116995195 A CN 116995195A CN 202310931878 A CN202310931878 A CN 202310931878A CN 116995195 A CN116995195 A CN 116995195A
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CN
China
Prior art keywords
pole piece
solid electrolyte
electrolyte membrane
electrode
roller assembly
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CN202310931878.6A
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Chinese (zh)
Inventor
李峥
冯玉川
施展
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Suzhou Qingtao New Energy S&T Co Ltd
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Suzhou Qingtao New Energy S&T Co Ltd
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Priority to CN202310931878.6A priority Critical patent/CN116995195A/en
Publication of CN116995195A publication Critical patent/CN116995195A/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
    • H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
    • H01M10/0562—Solid materials
    • 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
    • H01M4/043—Processes of manufacture in general involving compressing or compaction
    • H01M4/0435—Rolling or calendering
    • 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
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)

Abstract

The application provides a composite pole piece, a preparation method thereof and a lithium ion battery. The preparation method of the composite pole piece comprises the following steps: conveying the electrode pole piece through the electrode pole piece unreeling mechanism, so that the electrode pole piece passes through a gap between the first heating mechanism and the shaping roller assembly; conveying the solid electrolyte membrane through a solid electrolyte membrane unreeling mechanism positioned at the side edge of the electrode pole piece unreeling mechanism, so that the solid electrolyte membrane passes through a second heating mechanism and a gap between the shaping roller assembly and the electrode pole piece; preheating the electrode plate through a first heating mechanism; preheating the solid electrolyte membrane by a second heating mechanism; preheating electrode plates and solid electrolyte membranes respectively; and rolling and compounding the preheated electrode pole piece and the solid electrolyte membrane through a shaping roller assembly to prepare a compound pole piece. The preparation method improves the degree of recombination between the electrode plate and the solid electrolyte membrane and improves the consistency of the transverse thickness of the composite electrode plate.

Description

Composite pole piece, preparation method thereof and lithium ion battery
Technical Field
The application relates to the technical field of lithium ion batteries, in particular to a composite pole piece, a preparation method thereof and a lithium ion battery.
Background
With the continuous emergence of new technologies, the requirements on battery performance are also higher and higher, and lithium ion batteries are currently the main stream of the market, and have wide application prospects.
The traditional method adopts the method that a solid electrolyte material layer is coated on the surface of a positive electrode/negative electrode plate to improve the safety performance of the battery, but the volatilization of a solvent in the coated solid electrolyte layer easily causes the shrinkage deformation of the electrode plate, and the performance of the battery is influenced. Therefore, development of dry processes for preparing positive/negative electrode tabs and solid electrolyte membranes to improve the safety performance of batteries has received general attention. However, in the process of preparing the composite electrode sheet by the dry process, the safety performance and quality of the lithium ion battery are greatly affected due to the fact that the bonding force between the electrode sheet and the solid electrolyte membrane is weak and the problem of difficult tight combination exists.
Disclosure of Invention
Based on the above, the first aspect of the application provides a preparation method of the composite pole piece, which is characterized in that the electrode pole piece and the solid electrolyte membrane are respectively and independently preheated before rolling and compositing, so that the bonding force between the electrode pole piece and the solid electrolyte membrane is enhanced, and the tight compositing degree of the composite pole piece is improved.
The preparation method of the composite pole piece comprises the following steps:
conveying the electrode pole piece through the electrode pole piece unreeling mechanism, so that the electrode pole piece passes through a gap between the first heating mechanism and the shaping roller assembly;
conveying the solid electrolyte membrane through a solid electrolyte membrane unreeling mechanism positioned at the side of the electrode pole piece unreeling mechanism, so that the solid electrolyte membrane passes through a second heating mechanism and a gap between the shaping roller assembly and the electrode pole piece;
preheating the electrode pole piece through a first heating mechanism;
preheating the solid electrolyte membrane by a second heating mechanism;
and rolling and compounding the preheated electrode pole piece and the solid electrolyte membrane through a shaping roller assembly to prepare a compound pole piece.
In some embodiments, a resilient member is disposed between the sizing roller assembly and the solid electrolyte membrane.
In some embodiments, the elastic member is a protective film that is transported through a gap between the sizing roller assembly and the solid electrolyte membrane, and the protective film is attached to the surface of the composite pole piece.
In some embodiments, the method of making a composite pole piece further comprises the steps of: and separating the protective film from the composite pole piece.
In some embodiments, the elastic member is a glue layer that surrounds and covers the outside of the sizing roller assembly.
In some embodiments, a ninth guide roller is disposed between the shaping roller assembly and the second heating mechanism, the ninth guide roller for adjusting the preheating time of the solid electrolyte membrane.
In some embodiments, a third guide roller is arranged between the shaping roller assembly and the ninth guide roller, and the third guide roller is used for adjusting the preheated electrode pole piece and the solid electrolyte membrane to enter the shaping roller assembly along the horizontal direction.
In some embodiments, solid electrolyte membranes respectively positioned at two sides of the electrode pole piece are rolled and compounded on the electrode pole piece through a shaping roller assembly to obtain the compound pole piece.
In some embodiments, the time of preheating is greater than or equal to 2S.
In some embodiments, the solid electrolyte membrane is covered with a substrate, and the method of making further comprises the steps of: separating the base material covered on the solid electrolyte membrane from the composite pole piece.
In some embodiments, the method of making the composite pole piece further comprises cooling the composite pole piece.
In some embodiments, the method of making a composite pole piece further comprises:
receiving the composite pole piece through a composite pole piece winding mechanism at the downstream of the shaping roller assembly;
receiving a substrate through a substrate winding mechanism between the shaping roller assembly and the composite pole piece winding mechanism;
The substrate winding mechanism and the solid electrolyte membrane unwinding mechanism are positioned on the same side of the electrode pole piece unwinding mechanism.
In some embodiments, the method of making a composite pole piece further comprises:
conveying the elastic piece through a protective film unreeling mechanism; the protective film unreeling mechanism is positioned between the solid electrolyte film unreeling mechanism and the shaping roller assembly; and
and the elastic piece is received between the shaping roller assembly and the substrate winding mechanism through the protective film winding mechanism.
The second aspect of the application provides a composite pole piece, which is prepared according to the preparation method provided by the first aspect.
The third aspect of the application provides a lithium ion battery, which comprises the composite pole piece provided in the second aspect.
According to the preparation method of the composite electrode plate, due to the fact that the electrode plate and the solid electrolyte membrane are different in material and different in proper heating temperature, the electrode plate and the solid electrolyte membrane are respectively subjected to independent preheating treatment through the first heating mechanism and the second heating mechanism before the rolling compounding step, the electrode plate and the solid electrolyte membrane are fully preheated, mutual influence is avoided in the preheating treatment process, and the preheating effect is guaranteed; compared with the electrode plate and the solid electrolyte membrane before preheating, the preheated electrode plate and the solid electrolyte membrane are softened, so that the flexibility of the electrode plate and the solid electrolyte membrane is improved, the ductility of the electrode plate and the solid electrolyte membrane is improved, the electrode plate can be rapidly compounded with the solid electrolyte membrane in the rolling compounding step, the electrode plate and the solid electrolyte membrane are meshed more tightly, the bonding force strength between the two layers of membranes is improved, and the effect of tight compounding is more easily achieved.
According to the preparation method of the composite electrode plate, in the rolling process of the shaping roller assembly, the stress conditions of the electrode plate and the solid electrolyte membrane in the rolling process are regulated through the buffering provided by the elastic piece, so that the solid electrolyte membrane can better cover the electrode plate; the stress of the electrode pole piece and the solid electrolyte membrane in the rolling process is uniform, so that the transverse thickness of the electrode pole piece tends to be consistent after rolling, the adverse effect on the rolling composite process caused by the phenomena of thick middle and thin two ends of the electrode pole piece is avoided, and the electrode pole piece is prevented from being crushed; the degree of recombination between the electrode plate and the solid electrolyte membrane is improved, and the consistency of the transverse thickness of the composite electrode plate is improved. In addition, the composite pole piece prepared by the preparation method is applied to the battery, and is beneficial to improving the overall safety performance of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for manufacturing a composite pole piece according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a device for manufacturing a composite pole piece according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a device for manufacturing a second composite pole piece according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a device for preparing a three-composite pole piece according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of a device for manufacturing a fourth composite pole piece according to an embodiment of the present application.
Fig. 6 is a schematic structural view of a device for manufacturing a composite pole piece according to a comparative example of the present application.
Fig. 7 is a schematic structural diagram of a device for preparing a two-composite pole piece according to the comparative example of the present application.
Fig. 8 is a schematic structural view of a device for preparing a three-composite pole piece according to the comparative example of the present application.
Description of the reference numerals
11. An electrode pole piece unreeling mechanism; 12. a composite pole piece winding mechanism;
21. a solid electrolyte membrane unreeling mechanism; 22. a substrate winding mechanism;
31. a first forming roller; 32. a second shaping roller;
41. a protective film unreeling mechanism; 42. a protective film winding mechanism;
51. a first guide roller; 52. a second guide roller; 53. a third guide roller; 54. a fourth guide roller; 55. a fifth guide roller; 56. a sixth guide roller; 57. a seventh guide roller; 58. an eighth guide roller; 59. a ninth guide roller; 60. a tenth guide roller; 61. an eleventh guide roller;
71. A first heating roller; 72. a second heating roller; 73. a third heating roller; 74. a cooling roller;
81. and (5) a glue layer.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application 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 application. The present application 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 application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that these terms "first," "second," "third," if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or as implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature.
In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
The terms "comprising," "including," "containing," "having," or other variations thereof herein are intended to cover a non-closed inclusion, without distinguishing between these terms. The term "comprising" means that other steps and components may be added that do not affect the end result. The compositions and methods/processes of the present application comprise, consist of, and consist essentially of the essential elements and limitations described herein, as well as additional or optional ingredients, components, steps, or limitations of any of the embodiments described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 2-5, the preparation device of the composite pole piece comprises a shaping roller assembly, an electrode pole piece unreeling mechanism 11, a solid electrolyte membrane unreeling mechanism 21, a heating mechanism and a composite pole piece reeling mechanism 12. The shaping roller assembly comprises a first shaping roller 31 and a second shaping roller 32 which are symmetrically arranged on two sides of the electrode pole piece; the connecting line between the axes of the first shaping roller 31 and the second shaping roller 32 is perpendicular to the conveying direction of the electrode sheet.
The electrode sheet unreeling mechanism 11 is located upstream of the shaping roller assembly for unreeling the electrode sheet, and then transporting the electrode sheet so that the electrode sheet passes through a gap between the first shaping roller 31 and the second shaping roller 32.
It can be understood that the electrode plate of the application is a positive electrode plate or a negative electrode plate.
The solid electrolyte membrane unwind mechanism 21 is located upstream of the shaping roller assembly, and more specifically, between the electrode sheet unwind mechanism 11 and the shaping roller assembly. The solid electrolyte film unreeling mechanism 21 is used for unreeling the solid electrolyte film and then conveying the solid electrolyte film so that the solid electrolyte film passes through the gap between the first shaping roller 31 and the second shaping roller 32, and more specifically the solid electrolyte film unreeling mechanism 21 so that the solid electrolyte film passes through the gap between the electrode sheet and the shaping roller assembly.
In some embodiments, the number of the solid electrolyte membrane unreeling mechanisms 21 is two, which are respectively located at both sides of the electrode sheet unreeling mechanism 11, and then the solid electrolyte membrane is transported such that the two layers of the solid electrolyte membrane pass through the gap between the first shaping roller 31 and the second shaping roller 32, respectively, and the electrode sheet is located in the middle of the two layers of the solid electrolyte membrane.
Alternatively, two solid electrolyte membrane unreeling mechanisms 21 are symmetrically arranged on both sides of the electrode sheet unreeling mechanism 11.
The heating mechanism is positioned between the electrode plate unreeling mechanism 11 and the shaping roller assembly and is used for preheating the electrode plate and/or the solid electrolyte membrane.
In some embodiments, the heating mechanism comprises a first heating mechanism and a second heating mechanism, wherein the first heating mechanism is used for preheating the electrode pole piece; the second heating mechanism is used for preheating the solid electrolyte membrane.
In some embodiments, the number of the first heating mechanism and the second heating mechanism is not particularly limited, and the first heating mechanism may be one or more; the second heating mechanism may be one or more; may be increased or decreased according to actual circumstances.
In some embodiments, the heating mechanism is a heated roller.
In some embodiments, the number of heating rollers in the composite pole piece manufacturing device is not particularly limited, and the specific number of heating rollers may be increased or decreased according to actual situations.
In some embodiments, the number of heating rollers may be one, i.e., the first heating roller 71.
In some embodiments, the number of the heating rollers can be multiple, and the temperature of the heating rollers gradually rises along the running direction of the electrode pole pieces, so that the preheating effect is more uniform.
In some embodiments, the number of the first heating roller 71 and the second heating roller 72 may be 1, 2 or more, respectively, and is not particularly limited herein.
In some embodiments, the heated roller is preheated for a period of greater than or equal to 2S.
In some embodiments, the first heated roller 71 is used to preheat the electrode sheet and the second heated roller 72 is used to preheat the solid electrolyte membrane.
The composite pole piece winding mechanism 12 is located at the downstream of the shaping roller assembly and is used for providing a pulling force along the movement direction of the electrode pole piece for the electrode pole piece, receiving the composite pole piece obtained after the rolling and compounding by the shaping roller assembly and completing the winding action.
It is understood that the preheating mode is not particularly limited in the present application, and the electrode sheet, the solid electrolyte membrane and the protective film may be preheated by contact type preheating, blast type preheating, radiation type preheating or the like. Preferably, the S-shaped double-roller contact type heating is adopted, and space can be saved through a roller with a large wrap angle or a plurality of heating rollers with smaller volumes. Under lower cost, the preheating device realizes rapid heating, has short preheating stroke and high heat transfer speed, and can realize independent temperature control of any heating roller in contact type preheating.
In some embodiments, an elastic member is provided between the first shaping roller 31 and the second shaping roller 32.
In some embodiments, the first shaping roller 31 and/or the second shaping roller 32 are internally provided with a heating unit.
In the electrode plate production process, in order to smoothly carry out the subsequent rolling process, the edge of the electrode plate is usually thinned, and the existence of the thinned area of the electrode plate leads the bonding of the solid electrolyte membrane and the electrode plate to be affected.
Surprisingly, the preparation device of the composite pole piece utilizes the buffer provided by the elastic piece during rolling, so that the solid electrolyte membrane can better cover the electrode pole piece; meanwhile, in the rolling process of the shaping roller assembly, the stress of the middle area of the electrode pole piece is larger than that of the edge area due to the fact that the middle thickness of the electrode pole piece is thick, and the transverse thickness of the electrode pole piece tends to be consistent after rolling.
The elastic layer is made of flexible materials, the flexible materials are elastically deformed under the action of pressure, and the thickness of the middle area and the thickness of the thinned area of the electrode pole piece tend to be consistent under the action of pressure due to the tiny elastic deformation, so that the electrode pole piece can be well attached to the solid electrolyte membrane.
In some embodiments of the application, the flexible material is a polymer.
The material of the polymer is not particularly limited, and can be exemplified by plastics such as polytetrafluoroethylene, polyethylene terephthalate, polypropylene, polyacrylonitrile and the like, rubbers such as HEPA (high performance polyethylene) rubber, silicone rubber, fluororubber and the like, and elastic materials such as silica gel and the like which can deform to a certain extent.
The thickness of the elastic member is not particularly limited in the present application, and the necessary adjustment of the thickness of the elastic member is understood to be within the scope of the present application without departing from the inventive concept.
In some embodiments, the elastic member is a glue layer 81 that surrounds the outside of the two sizing roller assemblies.
In some embodiments, the elastic member is a protective film that is transported through a gap between the sizing roller assembly and the solid electrolyte membrane.
The device for preparing the composite pole piece of the application also comprises a protective film unreeling mechanism 41 for unreeling the protective film. The protective film unreeling mechanism 41 is located upstream of the shaping roller assembly, and is disposed between the solid electrolyte film unreeling mechanism 21 and the shaping roller assembly, for unreeling the protective film. The protective film is transported through the gap between the sizing roller assembly and the solid electrolyte membrane.
The present application has no special requirements on the structure of the protective film, and on the basis of not departing from the concept of the present application, known film layers which can generate a certain degree of elastic deformation under a certain pressure can be used in the present application, and the protective film can be selected from polymer films or non-woven fabrics, wherein the non-woven fabrics comprise but are not limited to PP-based non-woven fabrics, PE-based non-woven fabrics, PET-based non-woven fabrics, PAN-based non-woven fabrics, PTFE-based non-woven fabrics, celgard non-woven fabrics and the like by way of illustrative example only and not limiting the scope of protection; the polymer film may be selected from PVDF film, PE film, PP film, PE/PP/PE film, PP/PE/PP film, PTFE film, silicone oil release film, fluorine release film, PET film, non-silicon release film, etc. It is understood that the protective film may also be a multilayer structure consisting of two or more layers of polymer film and/or nonwoven fabric.
The thickness of the protective film is not particularly limited, and conventional adjustment of the thickness of the protective film for adjusting the rolling effect is considered to be within the scope of the present application without departing from the concept of the present application, and it is understood that the thickness of the protective film should be the sum of the thicknesses of the multilayer structures when the protective film is of the multilayer structure.
In some embodiments, the apparatus for producing a composite pole piece further includes a protective film winding mechanism 42, the protective film winding mechanism 42 being located downstream of the shaping roller assembly, between the shaping roller assembly and the composite pole piece winding mechanism 12, for providing tension to the protective film and winding up and receiving the protective film.
In some embodiments, the apparatus for preparing a composite pole piece further includes a substrate take-up mechanism 22.
When the base material is arranged on the solid electrolyte membrane, the base material covers one side of the solid electrolyte membrane far away from the electrode plate, and the base material is required to be separated after the electrode plate and the solid electrolyte membrane are rolled by the shaping roller assembly to obtain the composite electrode plate. The separation of the substrate from the composite pole piece is accomplished by providing a substrate take-up mechanism 22 downstream of the sizing roller assembly. In the separation process, the substrate winding mechanism 22 provides a pulling force to the substrate covered on the solid electrolyte membrane, so that the substrate is separated from the composite pole piece, and the substrate winding action is completed if necessary.
The number of the substrate winding mechanisms 22 corresponds to the number of the solid electrolyte membrane unwinding mechanisms 21, and the substrate winding mechanisms 22 and the solid electrolyte membrane unwinding mechanisms 21 are located on the same side of the electrode sheet unwinding mechanism 11.
The application is not particularly limited in the kind of the base material, and any known material which has a certain supporting effect, can be more beneficial to the film formation of the electrolyte material and can be separated from the solid electrolyte film after rolling can be used in the application on the basis of not departing from the concept of the application; by way of illustrative example only, and not by way of any limitation of the scope of protection, the substrate is selected from one or more of silicone oil release film, fluorine release film, PET film, PP film, PE/PP film, PP/PE/PP film, PE/PP/PE film, non-silicon release film.
In some embodiments, the apparatus for preparing a composite pole piece further comprises a guide roller.
Optionally, a guiding roller is located between the electrode sheet unreeling mechanism 11 and the shaping roller assembly for providing guiding action for the electrode sheet. A guide roller for providing guiding function to the composite pole piece winding can also be arranged between the shaping roller assembly and the composite pole piece winding mechanism 12.
Alternatively, a guide roller is located between the solid electrolyte membrane unwind mechanism 21 and the shaping roller assembly for providing a guide for the solid electrolyte membrane. A guide roller for guiding the substrate coated on the solid electrolyte membrane separated from the composite pole piece may also be provided between the shaping roller assembly and the substrate winding mechanism 22.
Optionally, a guide roller is located between the protective film unreeling mechanism 41 and the shaping roller assembly for providing a guiding action for the protective film. A guide roller for providing a guide function for the recovery of the protective film may also be provided between the setting roller assembly and the protective film take-up mechanism 42.
In some embodiments, a ninth guide roller 59 is provided between the shaping roller assembly and the second heating mechanism, and the ninth guide roller 59 is used to adjust the warm-up time of the solid electrolyte membrane. In the process of feeding the solid electrolyte membrane, a wrap angle exists between the solid electrolyte membrane and the second heating roller 72, and when the wrap angle is too large, the solid electrolyte membrane is in contact with the second heating roller 72 for too long, so that the solid electrolyte membrane is easy to adhere to the second heating roller 72; when the wrap angle is too small, the contact time of the solid electrolyte membrane and the second heating roller 72 is too short, so that the heating time of the solid electrolyte membrane is insufficient, and therefore, the ninth guide roller 59 is arranged between the shaping roller assembly and the second heating mechanism, and the size of the wrap angle is controlled through the ninth guide roller 59, so that the preheating time of the solid electrolyte membrane is in a proper range.
In some embodiments, a third guide roller 53 is arranged between the shaping roller assembly and the ninth guide roller 59, and the preheated electrode pole piece and the solid electrolyte membrane can enter the shaping roller assembly along the horizontal direction by arranging the third guide roller 53, so that the flatness of the composite pole piece is ensured.
It should be understood that the term "along the horizontal direction" in the present application does not include the case of being completely horizontal, and specifically, includes the case of having an included angle of 10 ° or less when the film coming out of the third guide roller 53 forms an included angle with the horizontal direction. In some embodiments, the apparatus for preparing a composite pole piece further includes a chill roll 74 positioned between the sizing roll assembly and the composite pole piece take-up mechanism 12 for cooling the composite pole piece exiting the gap of the sizing roll assembly. The cooling roller 74 is arranged for reducing the temperature of the composite pole piece, so that the composite pole piece can be continuously wound, and the production efficiency is improved; at the same time, chill roll 74 also provides a sizing treatment for the composite pole piece.
In some embodiments, the number of chill rolls 74 may be 1 or more, preferably 2.
In some embodiments, a guide roller is disposed between the sizing roller assembly and the chill roller 74, and/or a guide roller is disposed between the chill roller 74 and the composite pole piece take-up mechanism 12 for adjusting the cooling time of the composite pole piece.
In some embodiments, the number of cooling rollers 74 and guide rollers in the composite pole piece manufacturing apparatus is not particularly limited, and the specific number may be increased or decreased according to the actual situation.
In some embodiments, the composite pole piece preparation device further comprises an unreeling deviation rectifying component, a pole piece static eliminating component and the like which are sequentially arranged along the unreeling route. The unreeling deviation correcting component can correct unreeling and running routes of the electrode pole pieces, the solid electrolyte membrane and the like, so that the starting material line is kept at the same level. The winding and unwinding mechanism of the main material adopts a single-station deviation correction, and the winding and unwinding of the rest materials adopts cantilever type with deviation correction. The static eliminating assembly performs static eliminating treatment on the two sides of the electrode pole piece, so that friction force between the pole piece and the conveying roller can be reduced. It is understood that known functional components or structures may be used in the present application throughout the process of winding, rolling, unwinding without departing from the inventive concept.
In some embodiments, the composite pole piece manufacturing apparatus further comprises a tension control device.
In some embodiments, the tension control device includes a plurality of tension control elements disposed upstream of the sizing roller assembly for controlling the unreeling tension of the electrode sheet, the solid electrolyte membrane, and the protective film, respectively.
In some embodiments, the tension control device includes a plurality of tension control elements disposed downstream of the sizing roller assembly for controlling the winding tension of the composite pole piece, the substrate, and the protective film, respectively.
In some embodiments, the composite pole piece preparation device further comprises a thickness measuring mechanism, and after the shaping roller assembly is used for rolling and compounding, the composite pole piece enters the composite pole piece rolling mechanism 12 for rolling after passing through the inspection of the thickness measuring mechanism.
In some embodiments, the heated and cooled rollers 74 described above also include sensors for detecting the surface temperature of the composite pole piece.
In some embodiments, the sizing roller assembly has a width of 500-800mm, including but not limited to 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm. Preferably 550-650mm.
In some embodiments, the sizing roller assembly has a roller diameter of 300-500mm, including but not limited to 300mm, 350mm, 400mm, 450mm, 500mm. Preferably 350-450mm.
In some embodiments, the tonnage of the sizing roll assembly is 10-15 tons, including but not limited to 11 tons, 12 tons, 13 tons, 14 tons, 15 tons. Preferably 11-13 tons.
In some embodiments, the mechanical speed of the sizing roller assembly is 10-30m/min, including but not limited to 10m/min, 15m/min, 20m/min, 25m/min.
It can be understood that the higher the tape running speed of the whole composite pole piece preparation device is, the higher the production efficiency is, but the higher the tape running speed is, the problems of tape breakage and the like of the tape running pole piece and the solid electrolyte membrane are easily caused. The application has no special requirement on the residence time of the electrode plate and the solid electrolyte membrane in the gap of the shaping roller assembly, and the adjustment of the residence time without creative labor on the basis of not departing from the concept of the application is understood to fall within the protection scope of the application.
In some embodiments, the linear speeds of the first shaping roller 31 and the second shaping roller 32 are kept consistent, the linear speed of unreeling of the electrode pole piece unreeling mechanism 11 and the linear speed of reeling of the composite pole piece reeling mechanism 12 are also kept consistent, the action consistency of the whole composite pole piece rolling preparation process is improved, and the consistency of the composite pole piece is improved.
Referring to fig. 2 to 5, in combination with the structure of the manufacturing apparatus of the composite pole piece, the manufacturing method of the composite pole piece of the present application includes the steps of: unreeling the electrode sheet by the electrode sheet unreeling mechanism 11 and conveying the electrode sheet to the composite sheet reeling mechanism 12, so that the electrode sheet sequentially passes through gaps among the first heating roller 71, the first shaping roller 31 and the second shaping roller 32; conveying the solid electrolyte membrane through a solid electrolyte membrane unreeling mechanism 21 positioned at the side edge of the electrode pole piece unreeling mechanism 11, so that the solid electrolyte membrane sequentially passes through a gap among the second heating roller 72, the shaping roller assembly and the electrode pole piece; then rolling and compounding by a first shaping roller 31 and a second shaping roller 32; when in rolling lamination, an elastic piece is arranged between the shaping roller assembly and the solid electrolyte membrane; finally, downstream of the sizing roller assembly, the composite pole piece is received by a composite pole piece winding mechanism 12.
In some embodiments, the composite electrode sheet comprises an electrode sheet and solid electrolyte membranes respectively positioned at two sides of the electrode sheet. At this time, after the electrode sheet is transported, the solid electrolyte film is unwound by two solid electrolyte film unwinding mechanisms 21 respectively positioned at both sides of the electrode sheet unwinding mechanism 11 and is conveyed to the shaping roller assembly, so that the two layers of solid electrolyte film respectively pass through gaps among the second heating roller 72, the first shaping roller 31 and the second shaping roller 32 in sequence; in the gap between the first shaping roller 31 and the second shaping roller 32, the two layers of solid electrolyte membranes are attached to the electrode pole piece positioned in the middle of the two layers of solid electrolyte membranes and the elastic piece positioned on the outer side of the two layers of solid electrolyte membranes in pairs, and the solid electrolyte membranes are compounded on the two sides of the electrode pole piece under the rolling action of the shaping roller assembly; thereby obtaining the composite pole piece.
In some embodiments, the solid electrolyte membrane is formed separately, i.e., the solid electrolyte membrane is formed without the aid of a substrate and the membrane remains intact. At this time, after the electrode pole piece and the solid electrolyte membrane enter a gap of the shaping roller assembly, the composite pole piece is obtained under the pressure action of the shaping roller assembly, and the composite pole piece is wound by the electrode pole piece winding mechanism.
In some embodiments, the solid electrolyte membrane is covered with a substrate to provide support to the solid electrolyte membrane. The solid electrolyte membrane unreeling mechanism 21 makes the base material be located at the side of the solid electrolyte membrane far from the electrode plate when the solid electrolyte membrane is transported. And separating the base material from the composite electrode plate after the solid electrolyte membrane and the electrode plate are compounded. Specifically, the substrate can be received by the substrate winding mechanisms 22 respectively positioned at two sides of the composite pole piece winding mechanism 12, and the substrate winding mechanism 22 is positioned between the shaping roller assembly and the composite pole piece winding mechanism 12.
In some embodiments, the elastic member is a glue layer 81, which glue layer 81 is wrapped around the outside of the first and second shaping rollers 31, 32. When the shaping roller assembly rotates, the adhesive layer 81 rotates with the shaping roller assembly; and when the shaping roller assembly rolls the solid electrolyte membrane and/or the electrode pole piece, the adhesive layer 81 provides a buffer effect on the solid electrolyte membrane and/or the electrode pole piece, so that the solid electrolyte membrane can better cover one side or two sides of the electrode pole piece, and meanwhile, the consistency of the transverse thickness of the rolled electrode pole piece is improved.
In some embodiments, the elastic member is a glue layer 81, which glue layer 81 is wrapped around the outside of the sizing roller assembly. Referring to fig. 5, glue layers 81, solid electrolyte membranes, electrode plates, solid electrolyte membranes and glue layers 81 are sequentially distributed among the shaping roller assemblies. The axial length of the glue layer 81 extending the shaping roller assembly can be slightly larger than that of the shaping roller assembly, and the glue layer 81 rotates along with the shaping roller assembly during rolling.
In some embodiments, the elastic member is a protective film, the protective film may be unwound by two protective film unwinding mechanisms 41 located at the side of the solid electrolyte film unwinding mechanism 21 remote from the electrode sheet, and the protective film unwinding mechanism 41 conveys the protective film to the shaping roller assembly such that the two protective films pass through the gaps between the first shaping roller 31 and the second shaping roller 32, respectively. In the gap between the first shaping roller 31 and the second shaping roller 32, the protective film, the solid electrolyte film, the electrode pole piece, the solid electrolyte film and the protective film are sequentially distributed in pairs, and the solid electrolyte film is compounded on two sides of the electrode pole piece under the rolling action of the shaping roller assembly; thereby obtaining the composite pole piece.
Alternatively, as shown in fig. 2 to 4, in the shaping roller assembly and upstream thereof, the electrode sheet on the electrode sheet unreeling mechanism 11 reaches the first heating roller 71 after being guided by the first guiding roller 51, and then reaches the shaping roller assembly after being guided by the second guiding roller 52 and the third guiding roller 53; the solid electrolyte membranes positioned at the two sides of the electrode pole piece unreeling mechanism 11 reach the second heating roller 72 after being guided by the fourth guide roller 54, and then reach the shaping roller assembly after being guided by the ninth guide roller 59 and the third guide roller 53; the protective films positioned at the two sides of the electrode pole piece unreeling mechanism 11 are guided by the eighth guide roller 58 and then reach the shaping roller assembly; then, the composite of the protective film, the solid electrolyte film, the electrode sheet, the solid electrolyte film and the protective film is completed under the roll pressing of the first shaping roll 31 and the second shaping roll 32 through the gap between the first shaping roll 31 and the second shaping roll 32.
Alternatively, as shown in fig. 5, in the shaping roller assembly and upstream thereof, the electrode sheet on the electrode sheet unreeling mechanism 11 reaches the first heating roller 71 after being guided by the first guiding roller 51, and then reaches the shaping roller assembly after being guided by the second guiding roller 52 and the third guiding roller 53; the solid electrolyte membranes positioned at the two sides of the electrode pole piece unreeling mechanism 11 reach the second heating roller 72 after being guided by the fourth guide roller 54, and then reach the shaping roller assembly after being guided by the ninth guide roller 59 and the third guide roller 53; the outer sides of the first shaping roller 31 and the second shaping roller 32 are covered with an adhesive layer 81 in a surrounding manner, and the solid electrolyte membrane, the electrode pole piece and the solid electrolyte membrane are compounded after the rollers of the first shaping roller 31 and the second shaping roller 32 are pressed down.
The shaping roller assembly applies tension to the electrode pole piece and the solid electrolyte membrane during rolling, the protective film and the adhesive layer 81 are positioned between the shaping roller assembly and the solid electrolyte membrane, so that a buffer effect is achieved, the forces received by all sites of the electrode pole piece and the solid electrolyte membrane are uniform, the solid electrolyte membrane in the composite pole piece is finally obtained to almost completely cover the electrode pole piece, the combination between the electrode pole piece and the solid electrolyte membrane is better, the consistency of the transverse thickness of the composite pole piece is improved, and the compaction density is also improved.
In some embodiments, the protective film and the substrate may be separated from the composite membrane simultaneously.
Alternatively, downstream of the sizing roller assembly, as shown in FIG. 2, the protective film, substrate, and sizing roller assembly are attached and detached. Specifically, the protective film and the base material are guided by the fifth guide roller 55 and then respectively reach the protective film winding mechanism 42 and the base material winding mechanism 22, and the protective film and the base material are separated from the composite pole piece to obtain the composite pole piece; the composite pole piece reaches the cooling roller 74 after being guided by the sixth guide roller 56, and reaches the composite pole piece winding mechanism 12 after being guided by the seventh guide roller 57, so as to finish winding the composite pole piece.
As shown in fig. 5, the substrate is attached to and detached from the sizing roller assembly. Specifically, the substrate reaches the substrate winding mechanism 22 after being guided by the fifth guide roller 55, and the substrate is separated from the composite pole piece, so as to obtain the composite pole piece; the composite pole piece reaches the cooling roller 74 after being guided by the sixth guide roller 56, and reaches the composite pole piece winding mechanism 12 after being guided by the seventh guide roller 57, so as to finish winding the composite pole piece.
Alternatively, downstream of the sizing roller assembly, the protective film and the substrate may be passed through different guide rollers to the protective film take-up mechanism 42 and the substrate take-up mechanism 22, respectively, as shown in FIG. 3, without controlling the separation angle separation of the substrate and the composite pole piece. Specifically, the protective film reaches the protective film winding mechanism 42 after being guided by the fifth guide roller 55; the substrate reaches the substrate winding mechanism 22 after being guided by the eleventh guide roller 61 and the tenth guide roller 60, and the line between the tenth guide roller 60 and the eleventh guide roller 61 is a straight line; the protective film and the substrate are separated from the composite membrane.
Alternatively, downstream of the sizing roller assembly, the protective film and the substrate may be passed through different guide rollers to the protective film take-up mechanism 42 and the substrate take-up mechanism 22, respectively, as shown in FIG. 4, to control the separation angle separation of the substrate and the composite pole piece. Specifically, the protective film reaches the protective film winding mechanism 42 after being guided by the fifth guide roller 55; the substrate sequentially passes through an eleventh guide roller 61 and a tenth guide roller 60 to be guided and then reaches the substrate winding mechanism 22, and the wiring between the tenth guide roller 60 and the eleventh guide roller 61 is an S-shaped curve; the protective film and the base material are separated from the composite pole piece.
The application provides a preparation method of a composite pole piece by utilizing the preparation device of the composite pole piece, as shown in figure 1, comprising the following steps:
s10, respectively preheating electrode plates and solid electrolyte membranes;
s20, rolling and compounding the preheated electrode pole piece and the solid electrolyte membrane through a shaping roller assembly to prepare a composite pole piece.
In some embodiments, a method of making a composite pole piece includes the steps of:
conveying the electrode pole piece through the electrode pole piece unreeling mechanism, so that the electrode pole piece passes through a gap between the first heating mechanism and the shaping roller assembly;
Conveying the solid electrolyte membrane through a solid electrolyte membrane unreeling mechanism positioned at the side of the electrode pole piece unreeling mechanism, so that the solid electrolyte membrane passes through a second heating mechanism and a gap between the shaping roller assembly and the electrode pole piece;
preheating the electrode pole piece through a first heating mechanism;
preheating the solid electrolyte membrane by a second heating mechanism;
and rolling and compounding the preheated electrode pole piece and the solid electrolyte membrane through a shaping roller assembly to prepare a compound pole piece.
In some embodiments, a resilient member is disposed between the sizing roller assembly and the solid electrolyte membrane.
In some embodiments, the elastic member is a protective film that is transported through a gap between the sizing roller assembly and the solid electrolyte membrane, and the protective film is attached to the surface of the composite pole piece.
In some embodiments, the method of making a composite pole piece further comprises the steps of: and separating the protective film from the composite pole piece.
Referring to fig. 2-4, a protective film, a solid electrolyte film, electrode plates, a solid electrolyte film and a protective film are sequentially distributed among the shaping roller assemblies. The protective film is transported from the upstream of the shaping roller assembly to the shaping roller assembly, passes through a gap between the shaping roller assembly and the solid electrolyte membrane and is rolled, and then continuously moves to the downstream of the shaping roller assembly until being recovered. Therefore, the protective film can be repeatedly used, saves the production and manufacturing cost, reduces the damage to the environment, and is beneficial to improving the production efficiency.
In some embodiments, the elastic member is a glue layer 81, which glue layer 81 is wrapped around the outside of the sizing roller assembly.
In some embodiments, solid electrolyte membranes respectively positioned at two sides of the electrode pole piece are rolled and compounded on the electrode pole piece through a shaping roller assembly to obtain the compound pole piece.
It is understood that in the rolled composite electrode sheet, the solid electrolyte layer is composited on the electrode sheet. The solid electrolyte membrane is positioned at two sides of the electrode plate, namely, the two sides of the electrode plate are compounded with the solid electrolyte membrane through the compression roller.
In some embodiments, the electrode sheet and the solid-state electric matrix film are respectively preheated for a plurality of times, and the temperatures of the plurality of times of preheating are gradually increased. The preheating temperature is gradually increased for a plurality of times, so that the electrode plate and the solid electric matrix film are heated uniformly everywhere, and the subsequent rolling and compounding are tighter.
In some embodiments, the heated roller is preheated for a period of greater than or equal to 2S.
In some embodiments, a substrate is covered on one side of the solid electrolyte membrane far away from the electrode plate, and the preparation method of the composite electrode plate further comprises the following steps: separating the substrate from the composite pole piece.
In some embodiments, the recycled substrate may be wound up downstream of the sizing roller assembly by separating the substrate from the composite pole piece by a substrate winding mechanism 22.
In some embodiments, the preparation method of the composite pole piece further comprises the following steps: and (5) cooling the composite pole piece.
In some embodiments, the cooling roller 74 is used for cooling the composite pole piece, so that the temperature of the composite pole piece is reduced, the composite pole piece can be continuously wound, and the production efficiency is improved; at the same time, chill roll 74 also provides a sizing treatment for the composite pole piece.
In some embodiments, a method of making a composite pole piece includes the steps of:
the electrode pole piece is conveyed through the electrode pole piece unreeling mechanism 11, so that the electrode pole piece passes through a gap between the first heating mechanism and the shaping roller assembly;
conveying the solid electrolyte membrane through a solid electrolyte membrane unreeling mechanism 21 positioned at the side edge of the electrode pole piece unreeling mechanism 11, so that the solid electrolyte membrane passes through a second heating mechanism and a gap between the shaping roller assembly and the electrode pole piece;
preheating the electrode pole piece through a first heating mechanism;
preheating the solid electrolyte membrane by a second heating mechanism; and
rolling and compounding the preheated electrode plate and the solid electrolyte membrane through a shaping roller assembly to prepare a compound electrode plate;
Wherein, be provided with the elastic component between design roller assembly and the solid electrolyte membrane.
In some embodiments, the method of making a composite pole piece further comprises:
the composite pole piece is received by a composite pole piece winding mechanism 12 at the downstream of the shaping roller assembly;
receiving a substrate between the sizing roller assembly and the composite pole piece winding mechanism 12 through a substrate winding mechanism 22;
the substrate winding mechanism 22 and the solid electrolyte membrane unwinding mechanism 21 are located on the same side of the electrode sheet unwinding mechanism 11.
In some embodiments, the method of making a composite pole piece further comprises:
the elastic member is conveyed by the protective film unreeling mechanism 41; the protective film unreeling mechanism 41 is positioned between the solid electrolyte film unreeling mechanism 21 and the shaping roller assembly; and
between the sizing roller assembly and the substrate take-up mechanism 22, the elastic member is received by a protective film take-up mechanism 42.
According to the preparation method of the composite electrode plate, due to the fact that the electrode plate and the solid electrolyte membrane are different in material and different in proper heating temperature, the electrode plate and the solid electrolyte membrane are respectively subjected to independent preheating treatment through the first heating mechanism and the second heating mechanism before the rolling compounding step, the electrode plate and the solid electrolyte membrane are fully preheated, mutual influence is avoided in the preheating treatment process, and the preheating effect is guaranteed; compared with the electrode plate and the solid electrolyte membrane before preheating, the preheated electrode plate and the solid electrolyte membrane are softened, so that the flexibility of the electrode plate and the solid electrolyte membrane is improved, the ductility of the electrode plate and the solid electrolyte membrane is improved, the electrode plate can be rapidly compounded with the solid electrolyte membrane in the rolling compounding step, the electrode plate and the solid electrolyte membrane are meshed more tightly, the bonding force strength between the two layers of membranes is improved, and the effect of tight compounding is more easily achieved.
The traditional shaping roller assembly has high strength and poor deformation resistance, and the electrode pole piece is chamfered for smooth rolling procedure, so that a structure with thick middle and thin two ends is formed. Because the transverse thickness of the electrode plate is inconsistent, when the solid electrolyte membrane is attached to the electrode plate, the edge area of the electrode plate is still in a separated state with the solid electrolyte membrane. When the rolling equipment carries out rolling lamination on the electrode pole piece and the solid electrolyte membrane, the electrode pole piece and the solid electrolyte membrane are difficult to be compounded tightly due to the fact that the rolling force of the steel roller is different in the middle area and the edge area of the electrode pole piece, namely ineffective compounding is achieved, the transverse compaction density of the compound pole piece is inconsistent, and meanwhile the consistency of the compound pole piece is poor. The electrode plate is severely broken, so that the safety performance and quality of the lithium ion battery are greatly affected.
According to the preparation method of the composite electrode plate, in the rolling process of the shaping roller assembly, the stress conditions of the electrode plate and the solid electrolyte membrane in the rolling process are regulated through the buffering provided by the elastic piece, so that the solid electrolyte membrane can better cover the electrode plate; the stress of the electrode pole piece and the solid electrolyte membrane in the rolling process is uniform, so that the transverse thickness of the electrode pole piece tends to be consistent after rolling, the adverse effect on the rolling composite process caused by the phenomena of thick middle and thin two ends of the electrode pole piece is avoided, and the electrode pole piece is prevented from being crushed; the degree of compositing among the electrode pole pieces, the solid electrolyte membrane and the protective film is improved, and the consistency of the transverse thickness of the composite pole pieces is improved. In addition, the composite pole piece prepared by the preparation method is applied to the battery, so that the condition that powder is possibly dropped in the charge-discharge cycle process of the battery can be effectively prevented, the cycle performance of the battery is influenced, and the integral safety performance of the battery is improved.
The composite process of the present application is carried out under dry conditions, which are different from the conventional wet electrode preparation method, which is to prepare a solid electrolyte slurry first, then to apply the solid electrolyte slurry to an electrode sheet or vice versa, prepare an electrode slurry, and then to apply the electrode slurry to a solid electrolyte membrane. The preparation process of the application does not use solvent, avoids the complicated drying step of the subsequent steps, and can effectively reduce the production cost.
It is understood that the dry process refers to the preparation process of the relevant electrode plate and electrolyte membrane without adding solvent; solutions of minor amounts of liquid lubricants or other liquid additives possibly used during rolling are still within the scope of the application.
In some embodiments, both the electrode sheet and the solid electrolyte membrane are prepared by a dry process.
In some embodiments, at least one of the electrode sheet and the solid electrolyte membrane is prepared by a dry process.
In some embodiments, both the electrode sheet and the solid electrolyte membrane are prepared by a wet process.
It will be appreciated that the electrode sheet and solid electrolyte membrane are preferably prepared under dry conditions, and thus, no solvent is required throughout the electrode preparation process.
It will be appreciated that the preparation process of the electrode sheet and the solid electrolyte membrane is independent of the preparation process of the composite electrode, i.e. if a wet process is used, the electrode sheet is subjected to the coating, baking and rolling processes.
In some embodiments, the electrode sheet is a positive electrode sheet. The positive electrode material, especially the high-nickel ternary material with higher energy density, is easy to generate unexpected side reaction with electrolyte, especially nonaqueous electrolyte, and the side reaction causes the reduction of battery performance and potential safety hazard; and the solid electrolyte layer is compounded on the surface of the positive electrode, so that the safety of the battery is improved.
The positive electrode sheet includes an active material layer and a current collector layer. When preparing the positive plate by a dry method, firstly stirring an active substance, a conductive agent and a binder to obtain a positive mixture; and (3) carrying out fibrosis treatment on the mixture to obtain a fibrosis mixture of the positive electrode, and carrying out rolling compounding on the fibrosis mixture of the positive electrode and a current collector layer to obtain the positive electrode plate.
In some embodiments, the method of fiberizing includes, but is not limited to, air milling, high speed stirring, mechanical fusion, twin screw extrusion, and the like.
The positive electrode active material layer is formed of a positive electrode active material containing one or more transition metal cations, such as manganese (Mn), nickel (Ni), cobalt (Co), chromium (Cr), iron (Fe), vanadium (V), and combinations thereof. The positive electrode active material layer has a thickness of greater than or equal to about 1 μm to less than or equal to about 1,000 μm.
The positive electrode active material is one of layered oxide, spinel, and polyanion. For example, a layered oxide (e.g., a rock salt layered oxide) comprises one or more lithium-based positive electrode active materials selected from the group consisting of: liCoO 2 (LCO)，LiNi x Mn y Co 1-x-y O 2 (wherein x is more than or equal to 0 and less than or equal to 1, and y is more than or equal to 0 and less than or equal to 1), and LiNi 1-x-y Co x Al y O 2 (wherein x is more than or equal to 0 and less than or equal to 1, and y is more than or equal to 0 and less than or equal to 1), and LiNi x Mn 1-x O 2 (wherein 0.ltoreq.x.ltoreq.1), and Li 1+x MO 2 (wherein M is one of Mn, ni, co and Al and 0.ltoreq.x.ltoreq.1). The spinel comprises one or more lithium-based positive electrode active materials selected from the group consisting of: liMn 2 O 4 (LMO) and LiNi x Mn 1.5 O 4 . Olivine-type positive electrode active material LiMPO containing one or more lithium-based positive electrode active materials 4 (wherein M is at least one of Fe, ni, co and Mn). The polyanionic cation comprises, for example, a phosphate such as LiV 2 (PO 4 ) 3 And/or silicates such as life io 4 。
In some embodiments, one or more lithium-based positive electrode active materials may optionally be coated (e.g., by LiNbO 3 And/or Al 2 O 3 ) And/or may be doped (e.g., by magnesium (Mg)). Further, in certain embodiments, one or more lithium-based positive electrode active materials may optionally be mixed with one or more conductive materials that provide an electron conduction path and/or at least one polymeric binder material that improves the structural integrity of the positive electrode. For example, the positive electrode active material layer may include greater than or equal to about 30 wt% to less than or equal to about 99 wt% of one or more lithium-based positive electrode active materials; greater than or equal to about 0 wt% to less than or equal to about 30 wt% of a conductive material; and greater than or equal to about 0 wt% to less than or equal to about 20 wt% of a binder.
In some embodiments, the binder comprises Polytetrafluoroethylene (PTFE), sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), polyvinylidene fluoride (PVDF), nitrile rubber (NBR), styrene-ethylene-butylene-styrene copolymer (SEBS), styrene-butadiene-styrene copolymer (SBS), lithium polyacrylate (LiPAA), sodium polyacrylate (NaPAA), sodium alginate, lithium alginate, and combinations thereof.
In some embodiments, the conductive material may include a carbon-based material, powdered nickel or other metal particles, or a conductive polymer. Carbon-based materials may include, for example, carbon black, graphite, acetylene black (e.g., KETCHENTM black or denktatm black), carbon fibers and particles of nanotubes, graphene, and the like. Examples of the conductive polymer include polyaniline, polythiophene, polyacetylene, polypyrrole, and the like.
It is to be understood that the above examples of positive electrode active materials, binders, and conductive materials are merely illustrative, and any known positive electrode active materials, binders, and conductive materials can be used in the present application without departing from the spirit of the present application. And the addition of known additives based on actual use requirements should also be considered within the scope of the present application.
In some embodiments, both the front and back sides of the current collector layer comprise an active material layer.
In some embodiments, the current collector layer may employ a metal foil or a composite current collector.
For example, aluminum foil may be used as the metal foil.
The composite current collector may include a polymeric material base layer and a metal layer formed on at least one surface of the polymeric material base material.
Studies have shown that wet coating is often used in the conventional art, but since the positive electrode active slurry is a water-based slurry, protrusions are often generated at the edges of the active material layer during drying due to fluidity and surface tension of the slurry. Meanwhile, when the positive electrode active material layer is rolled, the edges of the active material layer are cracked directly due to rolling stress, so that the positive electrode active material layer is cracked, and finally the performance of the battery is influenced. In addition, the problems of expansion, too fast performance decay and the like occur in the long-time circulation process of the battery due to the fact that the moisture content is too high in wet coating.
In some embodiments, the electrode sheet is a negative electrode sheet.
The negative electrode tab is formed of a lithium host material (e.g., a negative electrode active material) that can be used as a negative electrode terminal of a lithium ion battery. In various aspects, the negative electrode tab may be defined by a plurality of negative electrode active material particles. Such anode active material particles may be disposed in one or more layers so as to define the three-dimensional structure of the anode. In certain embodiments, the negative electrode may also include an electrolyte 50, such as a plurality of electrolyte particles (not shown).
In some embodiments, the negative electrode tab may be a negative electrode active material comprising lithium, including, for example, lithium metal and/or lithium alloy.
The negative electrode sheet may be a silicon-based negative active material comprising, for example, a silicon alloy, silicon oxide, or a combination thereof, which may also be mixed with graphite in some cases.
The negative electrode sheet may be a carbonaceous-based negative electrode active material comprising one or more of graphite, graphene, carbon Nanotubes (CNT), and combinations thereof.
The negative electrode sheet may also include one or more negative active materials that accept lithium, such as lithium titanium oxide (Li 4 Ti 5 O 12 ) One or more transition metals (e.g., tin (Sn)), one or more metal oxides (e.g., vanadium oxide (V) 2 O 5 ) Tin oxide (SnO), titanium dioxide (TiO) 2 ) Titanium niobium oxide (TixNbyOz, where 0.ltoreq.x.ltoreq.2, 0.ltoreq.y.ltoreq.24, and 0.ltoreq.z.ltoreq.64), metal alloys (such as copper-tin alloys (Cu) 6 Sn 5 ) And one or more metal sulfides such as iron sulfide (FeS).
Alternatively, the negative active material in the negative electrode sheet may be doped with one or more conductive materials that provide an electron conduction path and/or at least one polymeric binder material that improves the structural integrity of the negative electrode. For example, the anode active material may be doped with a binder such as: poly (tetrafluoroethylene) (PTFE), sodium carboxymethylcellulose (CMC), styrene-butadiene rubber (SBR), polyvinylidene fluoride (PVDF), nitrile-butadiene rubber (NBR), styrene-butylene-styrene copolymer (SEBS), styrene-butadiene-styrene copolymer (SBS), lithium polyacrylate (LiPAA), sodium polyacrylate (NaPAA), sodium alginate, lithium alginate, and combinations thereof.
The conductive material may include carbon-based materials, powdered nickel or other metallic particles, or conductive polymers. The carbon-based material may include, for example, particles of carbon black, graphite, superP, acetylene black (such as KETCHENTM black or denktatm black), carbon fibers and nanotubes, graphene, and the like. Examples of the conductive polymer include polyaniline, polythiophene, polyacetylene, polypyrrole, poly (3, 4-ethylenedioxythiophene) polysulfstyrene, and the like.
The negative electrode sheet may include greater than or equal to about 50 wt% to less than or equal to about 99 wt% of a negative electrode active material, alternatively greater than or equal to about 0 wt% to less than or equal to about 60 wt% of a solid state electrolyte, alternatively greater than or equal to about 0 wt% to less than or equal to about 15 wt% of a conductive material, and alternatively greater than or equal to about 0 wt% to less than or equal to about 10 wt% of a binder.
In some embodiments, the solid electrolyte membrane includes a solid electrolyte and a binder.
Preferably, the solid electrolyte membrane comprises a solid electrolyte, a binder, and a lithium salt.
When preparing the solid electrolyte membrane, firstly, stirring and mixing the solid electrolyte, the binder and the lithium salt, and carrying out fibrosis treatment on the mixture to obtain a fibrosis solid electrolyte mixture, wherein the fibrosis solid electrolyte mixture is pressed by rolling to obtain the solid electrolyte membrane.
In some embodiments, the solid state electrolyte is an inorganic solid state electrolyte including one or more of an oxide solid state electrolyte, a sulfide solid state electrolyte, a halide solid state electrolyte, a hydride solid state electrolyte, a boride solid state electrolyte, and a nitride solid state electrolyte.
The oxide solid electrolyte comprises one or more garnet ceramics, LISICON-type oxides, NASICON-type oxides, and perovskite-type ceramics. For example, one or more garnet ceramics include, but are not limited to, li 6.5 La 3 Zr 1.75 Te 0.25 O 12 、Li 7 La 3 Zr 2 O 12 、Li 6.2 Ga 0.3 La 2.95 Rb 0.05 Zr 2 O 12 、Li 6.85 La 2.9 Ca 0.1 Zr 1.75 Nb 0.25 O 12 、Li 6.25 Al 0.25 La 3 Zr 2 O 12 、Li 6.75 La 3 Zr 1.75 Nb 0.25 O 12 One or more of the following. One or more LISICON-type oxides include, but are not limited to, li 14 Zn(GeO 4 ) 4 、Li 3+x (P 1-x Si x )O 4 (wherein 0<x<1)、Li 3+x Ge x V 1-x O 4 (wherein 0<x<1) One or more of the following. One or more NASICON-type oxides may be formed from LiMM' (PO 4 ) 3 And a definition wherein M and M' are independently selected from Al, ge, ti, sn, hf, zr and La. For example, in certain variations, the one or more NASICON-type oxides include, but are not limited to, li 1+x Al x Ge 2-x (PO 4 ) 3 (LAGP) (wherein 0.ltoreq.x.ltoreq.2), li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP) (where 0.ltoreq.x.ltoreq.2), li 1+ x Y x Zr 2-x (PO 4 ) 3 (LYZP) (wherein 0.ltoreq.x.ltoreq.2), li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 、LiTi 2 (PO 4 ) 3 、LiGeTi(PO 4 ) 3 、LiGe 2 (PO 4 ) 3 、LiHf 2 (PO 4 ) 3 One or more of the following. One or more perovskite-type ceramics including, but not limited to, li 3.3 La 0.53 TiO 3 、LiSr 1.65 Zr 1.3 Ta 1.7 O 9 、Li 2x-y Sr 1-x Ta y Zr 1-y O 3 (wherein x=0.75 y and 0.60<y<0.75)、Li 3/8 Sr 7/16 Nb 3/4 Zr 1/4 O 3 、Li 3x La (2/3-x) TiO 3 (wherein 0<x<0.25 One or more of the following).
Sulfide solid state electrolytes include, but are not limited to Li 2 S-P 2 S 5 、Li 2 S-P 2 S 5 -MS x (wherein M is Si, ge and Sn and 0.ltoreq.x.ltoreq.2), li 3.4 Si 0.4 P 0.6 S 4 、Li 10 GeP 2 S 11.7 O 0.3 、Li 9.6 P 3 S 12 、Li 7 P 3 S 11 、Li 9 P 3 S 9 O 3 、Li 10.35 Si 1.35 P 1.65 S 12 、Li 9.81 Sn 0.81 P 2.19 S 12 、Li 10 (Si 0.5 Ge 0.5 )P 2 S 12 、Li(Ge 0.5 Sn 0.5 )P 2 S 12 、Li(Si 0.5 Sn 0.5 )PsS 12 、Li 10 GeP 2 S 12 (LGPS)、Li 6 PS 5 X (wherein X is Cl, br or I), li 7 P 2 S 8 I、Li 10.35 Ge 1.35 P 1.65 S 12 、Li 3.25 Ge 0.25 P 0.75 S 4 、Li 10 SnP 2 S 12 、Li 10 SiP 2 S 12 、Li 9.54 Si 1.74 P 1.44 S 11.7 C l0.3 、 (1-x) P 2 S 5-x Li 2 S (wherein 0.5.ltoreq.x.ltoreq.0.7).
The halide solid state electrolyte includes, but is not limited to, li 2 CdC l4 、Li 2 MgC l4 、Li 2 Cd I4 、Li 2 ZnI 4 、Li 3 OCl、LiI、Li 5 ZnI 4 、Li 3 OCl 1-x Br x (wherein 0<x<1) One or more of (a) and (b).
Boride solid state electrolytes include, but are not limited to, li 2 B 4 O 7 、Li 2 O-(B 2 O 3 )-(P 2 O 5 ) One or more of (a) and (b).
Nitride solid state electrolytes including but not limited to Li 3 N、Li 7 PN 4 、LiSi 2 N 3 、LiPONOne or more of (a) and (b).
The hydride solid state electrolyte includes, but is not limited to, li 3 AlH 6 、LiBH 4 、LiBH 4 -LiX (wherein X is one of Cl, br and I), liNH 2 、Li 2 NH、LiBH 4 -LiNH 2 One or more of (a) and (b).
In some embodiments, the inorganic solid state electrolyte may be one or more metal oxide particles or lithium-containing compounds, including but not limited to Al 2 O 3 、SiO 2 、TiO 2 、LiNbO 3 、Li 4 Ti 5 O 4 、Li 3 PO 4 One or more of the following.
In some embodiments, the solid state electrolyte further includes a portion of a polymer solid state electrolyte, a composite solid state electrolyte comprised of a polymer solid state electrolyte and an inorganic solid state electrolyte. In the embodiment of the application, the mass ratio of the inorganic solid electrolyte and the polymer solid electrolyte in the composite solid electrolyte is not particularly required, and a user can design according to actual needs. Wherein, the polymer solid electrolyte can be at least one of polyvinyl chloride (PVC), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA) and polyethylene oxide (PEO).
In some embodiments, the lithium salt includes, but is not limited to, lithium hexafluorophosphate (LiPF) 6 ) The method comprises the steps of carrying out a first treatment on the surface of the Lithium perchlorate (LiClO) 4 ) Lithium tetrachloroaluminate (LiAlCl) 4 ) Lithium iodide (LiI), lithium bromide (LiBr), lithium thiocyanate (LiSCN), lithium tetrafluoroborate (LiBF) 4 ) Lithium difluorooxalato borate (LiBF) 2 (C 2 O 4 ) (LiODFB), lithium tetraphenylborate (LiB (C) 6 H 5 ) 4 ) Lithium bis (oxalato) borate (LiB (C) 2 O 4 ) 2 ) Lithium tetrafluorooxalate phosphate (LiPF) 4 (C 2 O 4 ) (LiFeP), lithium nitrate (LiNO) 3 ) Lithium hexafluoroarsenate (LiAsF) 6 ) Lithium triflate (LiCF) 3 SO 3 ) Lithium bis (trifluoromethanesulfonyl imide) (LITFSI) (LiN (CF) 3 SO 2 ) 2 ) Lithium bis (fluorosulfonyl imide) (LiN (FSO) 2 ) 2 ) (LIFSI) and itA combination thereof. In certain variations, the lithium salt is selected from lithium hexafluorophosphate (LiPF 6 ) Lithium bis (trifluoromethanesulfonyl imide) (LiTFSI) (LiN (CF) 3 SO 2 ) 2 ) Lithium bis (fluorosulfonyl imide) (LiN (FSO) 2 ) 2 ) (LiFSI), lithium fluoroalkylphosphonate (LiFAP), lithium phosphate (Li) 3 PO 4 ) One or more of the following.
It is to be understood that the above-mentioned terms including oxide solid electrolyte, sulfide solid electrolyte, halide solid electrolyte, hydride solid electrolyte, nitride solid electrolyte, polymer solid electrolyte, etc. are all known in the art, and the above-mentioned materials are merely illustrative examples, and not limiting the scope of protection, and any known solid electrolyte type can be used in the present application without departing from the inventive concept.
In some embodiments, the solid electrolyte membrane has a thickness of 1-30 μm; preferably 3-20 μm; more preferably 3-15 μm.
The application of a solid electrolyte coating to the electrode surface, particularly the surface of a positive electrode of high capacity, can effectively improve the safety performance of the battery. But is limited by the energy density, the thickness of the solid electrolyte membrane is generally thin, which is an order of magnitude smaller than the dry-process electrode sheet, which makes the solid electrolyte membrane susceptible to cracking when the electrode sheet is dry-process compounded.
In some embodiments, the solid electrolyte membrane is formed separately, i.e., the solid electrolyte membrane is formed without the aid of a substrate and the membrane remains intact.
In some embodiments, the side of the solid electrolyte membrane remote from the electrode pads is covered with a substrate having a lower binding force to the solid electrolyte membrane than to the electrode pads. After rolling, at least a portion of the solid electrolyte is transferred to the electrode and separated from the substrate.
The application is not particularly limited in the kind of the base material, and any known material which has a certain supporting effect, can be more beneficial to the film formation of the electrolyte material and can be separated from the solid electrolyte film after rolling can be used in the application on the basis of not departing from the concept of the application; by way of illustrative example only, and not by way of any limitation of the scope of protection, the substrate is selected from one or more of silicone oil release film, fluorine release film, PET film, PP film, PE/PP film, PP/PE/PP film, PE/PP/PE film, non-silicon release film.
In some embodiments, the electrode sheet and solid electrolyte membrane may also be purchased.
The application also provides a composite pole piece, which is prepared according to the preparation method of the composite pole piece.
The application further provides a lithium ion battery, which comprises the composite pole piece.
Embodiments of the present application will be described more specifically below by way of examples. However, embodiments of the present application are not limited to these examples only.
Example 1.
The preparation device of the composite pole piece shown in fig. 2 is used for compositing the positive pole piece and two layers of solid electrolyte membranes, so that the solid electrolyte membranes are composited on the positive active material layers on the two sides of the positive pole piece at the same time. The solid electrolyte membrane is covered with a base material. Wherein the protective film is PE-based non-woven fabric.
The electrode pole piece starts from the electrode pole piece unreeling mechanism 11, passes through the first guide roller 51 to reach the first heating roller 71, and then passes through the second guide roller 52 and the third guide roller 53 to reach the shaping roller assembly after being guided; the solid electrolyte membranes positioned at the two sides of the electrode pole piece unreeling mechanism 11 are guided by the fourth guide roller 54 respectively and then reach the second heating roller 72, and then are guided by the ninth guide roller 59 and the third guide roller 53 and then reach the shaping roller assembly; the protective films positioned at the two sides of the electrode pole piece unreeling mechanism 11 are guided by the eighth guide roller 58 and then reach the shaping roller assembly; then rolling and compounding the protective film, the solid electrolyte film, the electrode pole piece, the solid electrolyte film and the protective film is completed under the rolling and pressing of the first shaping roller 31 and the second shaping roller 32 through the gap between the first shaping roller 31 and the second shaping roller 32; then the protective film and the base material are guided by a fifth guide roller 55 and respectively reach the protective film winding mechanism 42 and the base material winding mechanism 22, and the protective film and the base material are separated from the composite pole piece to obtain the composite pole piece; the composite pole piece reaches the cooling roller 74 after being guided by the sixth guide roller 56, and reaches the composite pole piece winding mechanism 12 after being guided by the seventh guide roller 57, so as to finish winding the composite pole piece.
The surface of the prepared composite pole piece has no crack.
Example 2.
This example differs from example 1 only in the manner in which the base material is separated from the composite pole piece downstream of the sizing roller assembly.
As shown in fig. 3, downstream of the shaping roller assembly, the protective film is guided by the fifth guide roller 55 and then reaches the protective film winding mechanism 42, and the protective film winding mechanism 42 separates the protective film from the composite film sheet and completes winding; the substrate reaches the substrate winding mechanism 22 after being guided by the eleventh guide roller 61 and the tenth guide roller 60, and the line between the tenth guide roller 60 and the eleventh guide roller 61 is a straight line; the substrate winding mechanism 22 separates the substrate from the composite film sheet and completes the winding.
The surface of the prepared composite pole piece has no crack.
Example 3.
This example differs from example 1 only in the manner in which the base material is separated from the composite pole piece downstream of the sizing roller assembly.
As shown in fig. 4, downstream of the shaping roller assembly, the protective film is guided by the fifth guide roller 55 and then reaches the protective film winding mechanism 42, and the protective film winding mechanism 42 separates the protective film from the composite film sheet and completes winding; the substrate reaches the substrate winding mechanism 22 after being guided by the eleventh guide roller 61 and the tenth guide roller 60, and the wiring between the tenth guide roller 60 and the eleventh guide roller 61 is an S-shaped curve; the substrate winding mechanism 22 separates the substrate from the composite film sheet and completes the winding.
The surface of the prepared composite pole piece has no crack.
Example 4.
This embodiment differs from embodiment 1 only in that the elastic member is a glue layer 81 instead of a protective film, and the glue layer 81 covers the outside of the first and second setting rollers 31 and 32.
As shown in fig. 5, the electrode sheet starts from the electrode sheet unreeling mechanism 11, passes through the first guide roller 51 to reach the first heating roller 71, and then passes through the second guide roller 52 and the third guide roller 53 to reach the shaping roller assembly after being guided; the solid electrolyte membranes positioned at the two sides of the electrode pole piece unreeling mechanism 11 are guided by the fourth guide roller 54 respectively and then reach the second heating roller 72, and then are guided by the ninth guide roller 59 and the third guide roller 53 and then reach the shaping roller assembly; then rolling and compounding the solid electrolyte membrane, the electrode pole piece and the solid electrolyte membrane is completed under the rolling of the first shaping roller 31 and the second shaping roller 32 through the gap between the first shaping roller 31 and the second shaping roller 32; then the substrate reaches the substrate winding mechanism 22 after being guided by the fifth guide roller 55, and the substrate is separated from the composite pole piece to obtain the composite pole piece; the composite pole piece reaches the cooling roller 74 after being guided by the sixth guide roller 56, and reaches the composite pole piece winding mechanism 12 after being guided by the seventh guide roller 57, so as to finish winding the composite pole piece.
The surface of the prepared composite pole piece has no crack.
Comparative example 1
The comparative example differs from example 1 in that no heated roller was provided in the manufacturing apparatus of the composite pole piece.
As shown in fig. 6, the electrode sheet starts from the electrode sheet unreeling mechanism 11 and reaches the shaping roller assembly through transportation; the solid electrolyte membranes positioned at the two sides of the electrode pole piece unreeling mechanism 11 are respectively guided by a fourth guide roller 54 and a ninth guide roller 59 and then reach the shaping roller assembly; the protective films positioned at the two sides of the electrode pole piece unreeling mechanism 11 are guided by the eighth guide roller 58 and then reach the shaping roller assembly; then rolling and compounding the protective film, the solid electrolyte film, the electrode pole piece, the solid electrolyte film and the protective film is completed under the rolling and pressing of the first shaping roller 31 and the second shaping roller 32 through the gap between the first shaping roller 31 and the second shaping roller 32; then the protective film and the base material are guided by a fifth guide roller 55 and respectively reach the protective film winding mechanism 42 and the base material winding mechanism 22, and the protective film and the base material are separated from the composite pole piece to obtain the composite pole piece; the composite pole piece reaches the cooling roller 74 after being guided by the sixth guide roller 56, and reaches the composite pole piece winding mechanism 12 after being guided by the seventh guide roller 57, so as to finish winding the composite pole piece.
Interlayer separation phenomenon exists at the edge of the composite pole piece, and microcracks exist at the edge of the composite pole piece, so that the use standard of the composite pole piece is not met.
Comparative example 2
The comparative example differs from example 4 in that no heated roller was provided in the manufacturing apparatus of the composite pole piece.
As shown in fig. 7, the electrode sheet starts from the electrode sheet unreeling mechanism 11 and reaches the shaping roller assembly through transportation; the solid electrolyte membranes positioned at the two sides of the electrode pole piece unreeling mechanism 11 are respectively guided by a fourth guide roller 54 and a ninth guide roller 59 and then reach the shaping roller assembly; then rolling and compounding the solid electrolyte membrane, the electrode pole piece and the solid electrolyte membrane is completed under the rolling of the first shaping roller 31 and the second shaping roller 32 through the gap between the first shaping roller 31 and the second shaping roller 32; then the substrate reaches the substrate winding mechanism 22 after being guided by the fifth guide roller 55, and the substrate is separated from the composite pole piece to obtain the composite pole piece; the composite pole piece reaches the cooling roller 74 after being guided by the sixth guide roller 56, and reaches the composite pole piece winding mechanism 12 after being guided by the seventh guide roller 57, so as to finish winding the composite pole piece.
Interlayer separation phenomenon exists at the edge of the composite pole piece, and microcracks exist at the edge of the composite pole piece, so that the use standard of the composite pole piece is not met.
Comparative example 3.
The comparative example differs from example 1 in that no heating roller and no elastic member were provided in the manufacturing apparatus of the composite pole piece.
As shown in fig. 8, the electrode sheet starts from the electrode sheet unreeling mechanism 11 and reaches the shaping roller assembly through transportation; the solid electrolyte membranes positioned at the two sides of the electrode pole piece unreeling mechanism 11 are respectively guided by a fourth guide roller 54 and a ninth guide roller 59 and then reach the shaping roller assembly; then, through the gap between the first shaping roller 31 and the second shaping roller 32, the solid electrolyte membrane, the electrode pole piece and the solid electrolyte membrane are compounded under the rolling of the first shaping roller 31 and the second shaping roller 32; then the substrate is guided by a fifth guide roller 55 and then reaches a substrate winding mechanism 22, and the substrate winding mechanism 22 separates the substrate from the composite pole piece to obtain the composite pole piece; the composite pole piece reaches the cooling roller 74 after being guided by the sixth guide roller 56, and reaches the composite pole piece winding mechanism 12 after being guided by the seventh guide roller 57, so as to finish winding the composite pole piece.
Interlayer separation phenomenon exists at the edge of the composite pole piece, and microcracks exist at the edge of the composite pole piece, so that the use standard of the composite pole piece is not met.
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 application, which are described in detail and are not to be construed as limiting the scope of the claims. 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 application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. The preparation method of the composite pole piece is characterized by comprising the following steps:
conveying the electrode pole piece through an electrode pole piece unreeling mechanism, so that the electrode pole piece passes through a gap between the first heating mechanism and the shaping roller assembly;
conveying the solid electrolyte membrane through a solid electrolyte membrane unreeling mechanism positioned at the side edge of the electrode pole piece unreeling mechanism, so that the solid electrolyte membrane passes through a second heating mechanism and a gap between the shaping roller assembly and the electrode pole piece;
preheating the electrode plate through the first heating mechanism;
preheating the solid electrolyte membrane by the second heating mechanism;
and rolling and compounding the preheated electrode pole piece and the solid electrolyte membrane through a shaping roller assembly to prepare a composite pole piece.
2. The method of manufacturing a composite pole piece of claim 1, wherein an elastic member is provided between the shaping roller assembly and the solid electrolyte membrane.
3. The method of manufacturing a composite pole piece of claim 2, wherein the elastic member is a protective film or a glue layer, the protective film being transported through a gap between the sizing roller assembly and the solid electrolyte membrane; the glue layer surrounds and covers the outer side of the shaping roller assembly.
4. A method of manufacturing a composite pole piece according to any one of claims 1 to 3, wherein a ninth guide roller is provided between the shaping roller assembly and the second heating mechanism, the ninth guide roller being for adjusting the preheating time of the solid electrolyte membrane.
5. The method according to claim 4, wherein a third guide roller is disposed between the shaping roller assembly and the ninth guide roller, and the third guide roller is used for adjusting the preheated electrode sheet and the solid electrolyte membrane to enter the shaping roller assembly along the horizontal direction.
6. A method of manufacturing a composite pole piece according to any one of claims 1 to 3, further comprising cooling the composite pole piece.
7. A method of manufacturing a composite pole piece according to any one of claims 1-3, further comprising:
the composite pole piece is received by a composite pole piece winding mechanism at the downstream of the shaping roller assembly;
a base material covered on the solid electrolyte membrane is received through a base material winding mechanism between the shaping roller assembly and the composite pole piece winding mechanism;
the substrate winding mechanism and the solid electrolyte membrane unwinding mechanism are positioned on the same side of the electrode pole piece unwinding mechanism.
8. A method of producing a composite pole piece according to claim 2 or 3, further comprising:
conveying the elastic piece through a protective film unreeling mechanism; the protective film unreeling mechanism is positioned between the solid electrolyte film unreeling mechanism and the shaping roller assembly; and
and the elastic piece is received between the shaping roller assembly and the substrate winding mechanism through the protective film winding mechanism.
9. A composite pole piece, characterized in that it is produced according to the production method of any one of claims 1-8.
10. A lithium ion battery comprising the composite pole piece of claim 9.
CN202310931878.6A 2023-07-27 2023-07-27 Composite pole piece, preparation method thereof and lithium ion battery Pending CN116995195A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117913351A (en) * 2024-03-19 2024-04-19 蜂巢能源科技股份有限公司 All-solid-state battery and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117913351A (en) * 2024-03-19 2024-04-19 蜂巢能源科技股份有限公司 All-solid-state battery and preparation method thereof

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