Pole piece of lithium ion battery and preparation method of pole piece

Abstract

The invention provides a pole piece of a lithium ion battery and a preparation method of the pole piece, the pole piece of the lithium ion battery comprises a current collector and an active material coated on the current collector, and by arranging the active material and an adhesive, the active material can be conveniently and rapidly fixed when being extruded and arranged on the current collector along an angle; the assembly state of the active material on the current collector is stabilized, the active material is placed in the slit die cavity to be extruded, the active material moves and deforms towards the single side direction, so that the structure becomes long and narrow, and the end part of the long and narrow active material is connected with the current collector to be rolled, so that the tortuosity of the lithium ion battery pole piece is reduced, and the service life of the lithium ion battery pole piece is prolonged. And the migration rate of lithium ions in the pole piece and the embedding rate of the lithium ions in the active material are accelerated, meanwhile, the problem that the pole piece is expanded and increased due to lithium ion embedding in the thickness direction of the pole piece is solved, and the probability of deformation of the lithium ion battery is reduced.

Description

Technical Field

[0001] This invention relates to the field of electrode technology for lithium-ion batteries, and particularly to an electrode for lithium-ion batteries and its preparation method. Background Technology

[0002] Lithium-ion batteries are an ideal energy storage device and are widely used in electronic products, electric vehicles, power tools and other fields.

[0003] With the increasing demands for battery performance, such as the need for extremely fast charging, current batteries are prone to lithium metal precipitation on the electrode surface during rapid charging, increasing battery safety risks. The precipitated lithium metal increases the local thickness of the battery, leading to risks such as battery deformation. In addition, during the charging process of lithium-ion batteries, lithium ions embed into the end faces of graphite materials, increasing the spacing between graphite layers and causing the electrode to expand. This results in the expansion rate of the electrode in the direction perpendicular to the current collector being greater than the expansion rate parallel to the electrode. As cycling continues, the battery expansion rate will gradually increase, leading to battery deformation and damage to electrical components.

[0004] Currently, common active material orientation techniques include methods such as adding magnetic particles and applying an external magnetic field, ice template method, and external magnetic field method. These methods are complex to implement, and the actual orientation effect is poor after the oriented electrode sheets are dried with solvent and rolled. Summary of the Invention

[0005] In view of the above problems, the purpose of this invention is to provide an electrode for a lithium-ion battery and a method for preparing the same, so as to solve the problem that in the prior art, the expansion rate of the electrode in the direction perpendicular to the current collector is greater than the expansion rate in the direction parallel to the electrode, and the expansion rate of the battery will gradually increase, resulting in battery deformation and damage to electrical components.

[0006] To address the aforementioned problems, the inventors have provided an electrode for a lithium-ion battery, comprising a current collector and an active material coated on the current collector:

[0007] The active material comprises the following components by weight percentage: active material: 95-98%, conductive agent: 0-3%, adhesive: 0.5-2%.

[0008] Unlike existing technologies, the above technical solution has the following advantages: by setting active materials and adhesives, it is easy to quickly fix the active materials when they are squeezed and set at an angle on the current collector, thus stabilizing the assembly state of the active materials on the current collector.

[0009] In a preferred embodiment of this application, the active material is flake-shaped graphite or flake-shaped graphene. By setting the active material to flake-shaped graphite or flake-shaped graphene, the processing of the active material is facilitated.

[0010] In a preferred embodiment of this application, the current collector is copper foil, nickel foam, copper foam, or graphite paper. Using copper foil, nickel foam, copper foam, metal-polymer composite current collectors, or graphite paper as the current collector facilitates the operation of the electrode.

[0011] In a preferred embodiment of this application, the active material comprises the following components by mass percentage: active material: 98%, conductive agent: 1%, and adhesive: 1%.

[0012] In a preferred embodiment of this application, the active material comprises the following components by weight percentage: active material: 95%, conductive agent: 3%, and adhesive: 2%.

[0013] In a preferred embodiment of this application, the active material comprises the following components by mass percentage: active material: 97%, conductive agent: 2%, and adhesive: 1%.

[0014] To achieve the above objectives, the inventors also provide a method for preparing an electrode for a lithium-ion battery, wherein the electrode is the same as the electrode described in the above embodiments, and includes the following steps:

[0015] S101: Mix the conductive agent, adhesive and active material required for the active material;

[0016] S102: Place the active material into the slit mold cavity;

[0017] S103: Apply extrusion to the slit cavity until the active material moves in a direction perpendicular to the extrusion process;

[0018] S104: Open the slit mold cavity, transfer the extruded active material onto the current collector, and set it at an angle to the current collector;

[0019] S105: Dry the current collector and the active material;

[0020] S106: The active material and the current collector are rolled together, and the active material is rolled and pulled to form an electrode in which the active material is vertically arranged on the current collector.

[0021] Unlike existing technologies, the above technical solution has the following advantages: By placing the active material into the slit mold cavity and extruding it, the active material moves and deforms in one direction, making the structure elongated. The end of the elongated active material is connected to the current collector and rolled. During the process of lithium ions moving along the active material towards the current collector and embedding into the graphite, the embedding is accelerated, reducing the tortuosity of the electrode active layer. This reduces the deformation of the cell during charging and the expansion rate in the thickness direction of the battery. It also reduces the tortuosity of the lithium-ion battery electrode, accelerates the migration rate of lithium ions inside the electrode and the embedding rate in the active material, and reduces the problem of increased expansion of the electrode in the thickness direction due to lithium ion embedding, thus reducing the probability of lithium-ion battery deformation.

[0022] In a preferred embodiment of this application, the drying temperature range for the current collector and active material is 100 to 140°C, and the drying time is 0.5 to 3 minutes. This fast-drying process further strengthens the bond between the binder and active particles in the active material and increases the overall cohesive force. The binder softens and its position adjusts, achieving stability in the overall mechanical structure of the electrode.

[0023] In a preferred embodiment of this application, the angle between the active material and the current collector is set to 30-90°. When the sheet-like active particles and the current collector are at a certain angle, lithium ions will quickly embed into the graphite particles. Because graphite material has a layered structure, only the end faces of the sheet-like particles can easily embed, resulting in increased fast-charging performance of the battery and improved electrode dynamics. In addition, the graphite particles themselves will expand in volume when embedded. If the sheet-like active material and the current collector are arranged at a certain angle, the expansion perpendicular to the current collector direction will be reduced, thereby reducing the overall expansion of the battery.

[0024] In a preferred embodiment of this application, in the step of applying extrusion to the slit mold cavity and stopping when the active material moves perpendicular to the direction of the extrusion process, the extrusion pressure is between 0.2 MPa and 30 MPa. After extrusion, the sheet material will be forcibly oriented, and the sheet particles will be arranged in the desired direction.

[0025] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram showing the active material in the mold without being compressed in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram illustrating the state of the active material being extruded within the mold in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram showing the state of the active material being prepared to be bonded to the current collector in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram showing the state of the active material after it has been bonded to the current collector in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the detailed structure of the active material after extrusion in an embodiment of the present invention.

[0032] The reference numerals used in the above figures are explained as follows:

[0033] 10. Molds;

[0034] 11. Slit mold cavity; 12. Extrusion block;

[0035] 20. Current collector;

[0036] 30. Active materials. Detailed Implementation

[0037] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0038] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0039] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0040] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the logical relationship between the preceding and following objects is "or".

[0041] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0042] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0043] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0044] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] Please refer to the following: Figures 1 to 5 The inventors provide an electrode for a lithium-ion battery, comprising a current collector 20 and an active material 30, wherein the active material 30 is disposed at an angle on the current collector 20, and the active material 30 comprises the following components by mass percentage: active material 30: 95-98%, conductive agent: 0-3%, and adhesive: 0.5-2%.

[0047] By setting the active material 30 and the adhesive, it is easy to quickly fix the active material 30 on the current collector 20 when it is squeezed and set at an angle, thus stabilizing the assembly state of the active material 30 on the current collector 20.

[0048] In a preferred embodiment of this application, the active material 30 is in the form of sheet-like graphite or sheet-like graphene. By setting the active material 30 to be in the form of sheet-like graphite or sheet-like graphene, the processing of the active material 30 is facilitated.

[0049] In a preferred embodiment of this application, the current collector 20 is made of copper foil, nickel foam, copper foam, or graphite paper. By using copper foil, nickel foam, copper foam, a metal polymer composite current collector, or graphite paper as the current collector 20, the purpose of rapid electron transfer is achieved. Specifically, the metal polymer composite current collector is a three-layer composite current collector, with a middle layer of PET and upper and lower metal plating layers. The PET thickness is 3-10 μm, and the metal plating layer thickness is 0.5-1 μm. The materials of the metal plating layer include copper, nickel, silver, tin, platinum, and gold.

[0050] In a preferred embodiment of this application, the active material 30 comprises the following components by mass percentage: active material 30: 98%, conductive agent: 1%, and adhesive: 1%.

[0051] In a preferred embodiment of this application, the active material 30 comprises the following components by mass percentage: active material 30: 95%, conductive agent: 3%, and adhesive: 2%.

[0052] In a preferred embodiment of this application, the active material 30 comprises the following components by mass percentage: active material 30: 97%, conductive agent: 2%, and adhesive: 1%.

[0053] Please refer to the following: Figures 1 to 5 To achieve the above objectives, the inventors also provide a method for preparing an electrode for a lithium-ion battery, wherein the electrode is the same as the lithium-ion battery electrode described in the above embodiments, and includes the following steps:

[0054] S101: Mix the conductive agent, adhesive and active material 30 required for active material 30;

[0055] S102: Place the active material 30 into the slit mold cavity 11;

[0056] S103: Apply extrusion to the slit cavity 11 until the active material 30 moves in a direction perpendicular to the extrusion process;

[0057] S104: Open the slit mold cavity 11, transfer the extruded active material 30 onto the current collector 20, and set it at an angle to the current collector 20;

[0058] S105: Dry the current collector 20 and the active material 30;

[0059] S106: The active material 30 and the current collector 20 are rolled together, and the active material 30 is rolled and pulled to form an electrode with the active material 30 perpendicular to the current collector 20.

[0060] By placing the active material into the slit cavity of the mold 10 and extruding it, the active material moves and deforms in one direction, making the structure elongated. The end of the elongated active material is then connected to the current collector and rolled. During the process of lithium ions moving along the active material towards the current collector and embedding into the graphite, the embedding is accelerated, reducing the tortuosity of the electrode active layer. This reduces the deformation of the cell during charging and the expansion rate in the thickness direction of the battery. It also reduces the tortuosity of the lithium-ion battery electrode, accelerates the migration rate of lithium ions inside the electrode and the embedding rate in the active material, and reduces the problem of increased expansion of the electrode in the thickness direction due to lithium ion embedding. This reduces the probability of lithium-ion battery deformation.

[0061] Example 1: An electrode for a lithium-ion battery

[0062] S101: Weigh the conductive agent, adhesive and active material 30 required for active material 30, and mix them in the following proportions: active material 30: 98%, conductive agent: 1%, adhesive: 1%;

[0063] S102: The active material 30, which is a mixture of conductive agent and adhesive, is placed into the slit mold cavity 11;

[0064] S103: Drive the extrusion block 12 to move within the slit mold cavity 11 and apply external force to the active material 30 mixed with conductive agent and adhesive within the slit mold cavity 11 for extrusion. The extrusion stops when the active material 30 mixed with conductive agent and adhesive moves in a direction perpendicular to the extrusion process.

[0065] S104: Open the slit mold cavity 11, transfer the extruded active material 30 of the mixed conductive agent and adhesive to the current collector 20, adhere it to the current collector 20, and set the straight direction of the active material 30 of the mixed conductive agent and adhesive from one end to the other at an angle to the current collector 20.

[0066] S105: Dry the current collector 20 and the active material 30 mixed with conductive agent and adhesive;

[0067] S106: The active material 30 and the current collector 20 are rolled together. The active material 30 is rolled and pulled to form an electrode in which the active material 30 is vertically arranged on the current collector 20.

[0068] Example 2: An electrode for a lithium-ion battery

[0069] S101: Weigh the conductive agent, adhesive and active material 30 required for active material 30, and mix them in the following proportions: active material 30: 95%, conductive agent: 3%, adhesive: 2%;

[0070] S102: The active material 30, which is a mixture of conductive agent and adhesive, is placed into the slit mold cavity 11;

[0071] S103: Drive the extrusion block 12 to move within the slit mold cavity 11 and apply external force to the active material 30 mixed with conductive agent and adhesive within the slit mold cavity 11 for extrusion. The extrusion stops when the active material 30 mixed with conductive agent and adhesive moves in a direction perpendicular to the extrusion process.

[0072] S104: Open the slit mold cavity 11, transfer the extruded active material 30 of the mixed conductive agent and adhesive to the current collector 20, adhere it to the current collector 20, and set the straight direction of the active material 30 of the mixed conductive agent and adhesive from one end to the other at an angle to the current collector 20.

[0073] S105: Dry the current collector 20 and the active material 30 mixed with conductive agent and adhesive;

[0074] S106: The active material 30 and the current collector 20 are rolled together. The active material 30 is rolled and pulled to form an electrode in which the active material 30 is vertically arranged on the current collector 20.

[0075] Unlike Example 1, the proportion of active material 30 is reduced and the proportion of conductive agent and adhesive is increased. The increase in adhesive will enhance the cohesion and flexibility of the electrode, preventing electrode delamination and breakage during the winding process. The increase in conductive agent will improve the conductive network inside the electrode. Due to the small particle size and large specific surface area of ​​the conductive agent, it will also increase the amount of electrolyte absorbed and extend the battery life.

[0076] Example 3: An electrode for a lithium-ion battery

[0077] S101: Weigh the conductive agent, adhesive and active material 30 required for active material 30, and mix them in the following proportions: active material 30: 97%, conductive agent: 2%, adhesive: 1%;

[0078] S102: The active material 30, which is a mixture of conductive agent and adhesive, is placed into the slit mold cavity 11;

[0079] S103: Drive the extrusion block 12 to move within the slit mold cavity 11 and apply external force to the active material 30 mixed with conductive agent and adhesive within the slit mold cavity 11 for extrusion. The extrusion stops when the active material 30 mixed with conductive agent and adhesive moves in a direction perpendicular to the extrusion process.

[0080] S104: Open the slit mold cavity 11, transfer the extruded active material 30 of the mixed conductive agent and adhesive to the current collector 20, adhere it to the current collector 20, and set the straight direction of the active material 30 of the mixed conductive agent and adhesive from one end to the other at an angle to the current collector 20.

[0081] S105: Dry the current collector 20 and the active material 30 mixed with conductive agent and adhesive;

[0082] S106: The active material 30 and the current collector 20 are rolled together. The active material 30 is rolled and pulled to form an electrode in which the active material 30 is vertically arranged on the current collector 20.

[0083] Unlike Example 1, the proportion of active material 30 is reduced and the proportion of conductive agent is increased. The increase in binder will enhance the cohesion and flexibility of the electrode, preventing electrode delamination and breakage during the winding process. The increase in conductive agent will improve the conductive network inside the electrode. Due to the small particle size and large specific surface area of ​​the conductive agent, it will also increase the amount of electrolyte absorbed and extend the battery life.

[0084] Unlike Example 2, the amount of conductive agent and adhesive added is reduced. Only a small amount of conductive agent is added. By reducing the proportion of non-active materials such as conductive agent and adhesive, the proportion of active materials can be increased, thereby increasing the volumetric or gravimetric energy density of the battery.

[0085] Compared to conventional electrodes, the active material 30 is directly disposed on the current collector 20. Due to the random orientation of the graphite, after rolling, the end faces of the graphite are aligned parallel to the current collector 20. This application places the active material 30 into the slit mold cavity 11 for extrusion, causing the active material 30 to deform in a unilateral direction, making the structure elongated. The end of the elongated active material 30 is then connected to the current collector 20 for rolling. This reduces the travel distance of lithium ions along the active material 30 towards the current collector 20, reduces the tortuosity of lithium ions on the surface of the active material 30, and reduces the probability of cell deformation and battery expansion.

[0086] In a preferred embodiment of this application, the drying temperature range for the current collector 20 and the active material 30 is 100 to 140°C, and the drying time is 0.5 to 3 minutes. This fast-drying process further strengthens the bond between the binder and the active particles in the active material 30 and increases the overall cohesive force. The binder softens and its position adjusts, achieving stability in the overall mechanical structure of the electrode.

[0087] In a preferred embodiment of this application, the angle between the active material 30 and the current collector 20 is set to 30-90°. When the sheet-like active particles and the current collector 20 are at a certain angle, lithium ions will quickly embed into the graphite particles. Because graphite material has a layered structure, only the end faces of the sheet-like particles can easily embed, resulting in increased fast-charging performance of the battery and improved electrode dynamics. In addition, the graphite particles themselves will expand in volume when embedded. If the sheet-like active material 30 and the current collector 20 are arranged at a certain angle, the expansion perpendicular to the current collector 20 will be reduced, thereby reducing the overall expansion of the battery.

[0088] In a preferred embodiment of this application, in the step of applying extrusion to the slit cavity 11 and stopping when the active material 30 is perpendicular to the direction of extrusion, the extrusion pressure is 0.2 MPa to 10 MPa. After extrusion, the sheet material will be forcibly oriented, and the sheet particles will be arranged in the desired direction.

[0089] During the operation, the current collector 20 adheres to the surface of the extruded active material 30 in preparation for the transfer process. The surface of the current collector 20 will be coated with conductive carbon and adhesive substances, such as hot melt adhesives or sugar-based materials. During the transfer process, the current collector 20 will be hot-pressed and these adhesive substances will bond together with the current collector 20.

[0090] In the above embodiments, the conductive agent, adhesive and active material 30 are pastes or dry powder mixtures.

[0091] In the above embodiments, the electrode of the lithium-ion battery and the method for preparing the electrode of the lithium-ion battery can be applied to the positive electrode or negative electrode of the lithium battery.

[0092] In the above embodiment, the slit cavity 11 is placed in the mold 10.

[0093] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application.

[0094] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. An electrode for a lithium-ion battery, characterized in that, Including current collectors and active materials coated on current collectors. composition: The active material comprises the following components by weight percentage: active material: 95-98%, conductive agent: 0-3%, adhesive: 0.5-2%.

2. The electrode of the lithium-ion battery according to claim 1, characterized in that, The active material is in the form of sheet-like graphite or sheet-like graphene.

3. The electrode of the lithium-ion battery according to claim 1, characterized in that, The current collector is made of copper foil, nickel foam, copper foam, metal polymer composite current collector, graphene, or graphite paper.

4. The electrode of the lithium-ion battery according to claim 1, characterized in that, The active material comprises the following components by weight percentage: active material: 98%, conductive agent: 1%, adhesive: 1%.

5. The electrode of the lithium-ion battery according to claim 1, characterized in that, The active material comprises the following components by weight percentage: active material: 95%, conductive agent: 3%, adhesive: 2%.

6. The electrode of the lithium-ion battery according to claim 1, characterized in that, The active material comprises the following components by weight percentage: active material: 97%, conductive agent: 2%, and adhesive: 1%.

7. A method for preparing an electrode for a lithium-ion battery, characterized in that, The electrode of the lithium-ion battery is the electrode of the lithium-ion battery according to any one of claims 1 to 6, and includes the following steps: S101: Mix the conductive agent, adhesive and active material required for the active material; S102: Place the active material into the slit mold cavity; S103: Apply extrusion to the slit cavity until the active material moves in a direction perpendicular to the extrusion process; S104: Open the slit mold cavity, transfer the extruded active material onto the current collector, and set it at an angle to the current collector; S105: Dry the current collector and the active material; S106: The active material and the current collector are rolled together, and the active material is rolled and pulled to form an electrode in which the active material is vertically arranged on the current collector.

8. The method for preparing the electrode of a lithium-ion battery according to claim 7, characterized in that, In the step of drying the current collector and the active material, the drying temperature ranges from 100 to 140°C, and the time is from 0.5 to 3 minutes.

9. The method for preparing the electrode of a lithium-ion battery according to claim 7, characterized in that, The angle between the active material and the current collector is set to 30-90°.

10. The method for preparing the electrode of a lithium-ion battery according to claim 7, characterized in that, In the step of applying extrusion to the slit die cavity and stopping when the active material moves in a direction perpendicular to the extrusion process, the extrusion pressure is from 0.2 MPa to 30 MPa.

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