Pole piece structure, battery cell and secondary battery

Abstract

The utility model belongs to the battery technical field, concretely relates to a kind of pole piece structure, electric core and secondary battery, including conductive substrate layer, adsorption guide layer and flow guide protective outer layer;The adsorption guide layer is connected on the at least one side surface of the conductive substrate layer;The flow guide protective outer layer is connected on the side surface of the adsorption guide layer away from the conductive substrate layer;And the flow guide protective outer layer side surface away from the adsorption guide layer is equipped with at least two flow guide grooves;All the flow guide grooves are arranged along the length direction of the flow guide protective outer layer surface;Each flow guide groove is arranged along the width direction of the flow guide protective outer layer surface and extends.The utility model can avoid electrolyte infiltration time too long, and can reduce electrolyte loss amount, to improve its stability of use further.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to an electrode structure, a battery cell and a secondary battery. Background Technology

[0002] With the rapid development of the new energy era, lithium-ion and sodium-ion batteries have also experienced rapid growth. In recent years, electronic devices such as mobile phones and tablets have been updated and replaced very frequently, while hybrid and new energy electric vehicles have gradually become more widespread. This has led to higher demands on the performance of products in the new energy industry. Therefore, high-performance lithium-ion and sodium-ion secondary batteries with large capacity, high energy density, and the ability to perform rapid charging and discharging have attracted widespread attention.

[0003] However, in practical applications, the cathode materials of some existing lithium-ion secondary batteries suffer from initial irreversible capacity loss due to the formation of a solid electrolyte interface film, resulting in low initial efficiency and reduced energy density, thus affecting the stability of their use. Utility Model Content

[0004] The purpose of this invention is to provide an electrode structure that addresses the shortcomings of existing technologies and solves the problem of low stability in the use of existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An electrode structure includes a conductive substrate layer, an adsorption and guiding layer, and a current-guiding protective outer layer; the adsorption and guiding layer is connected to at least one surface of the conductive substrate layer; the current-guiding protective outer layer is connected to the side surface of the adsorption and guiding layer away from the conductive substrate layer; and the side surface of the current-guiding protective outer layer away from the adsorption and guiding layer is provided with at least two current-guiding grooves; all the current-guiding grooves are arranged along the length direction of the surface of the current-guiding protective outer layer; each current-guiding groove extends along the width direction of the surface of the current-guiding protective outer layer.

[0007] Preferably, the inner wall of the flow guide groove is provided with a flow guide slope; the width of the flow guide groove facing the adsorption guide layer is smaller than the width of the flow guide groove away from the adsorption guide layer.

[0008] Preferably, the relationship between the depth h of the flow guide groove and the thickness H of the flow guide protective outer layer satisfies: h ≤ H;

[0009] And / or the thickness H of the flow-guiding protective outer layer satisfies: 5μm≤H≤50μm.

[0010] Preferably, the width D inside the guide channel satisfies: 0.08mm≤D≤2mm;

[0011] And / or, the distance between two adjacent guide channels is L, where L satisfies: 0.5mm≤L≤5mm.

[0012] Preferably, the relationship between the thickness H of the outer protective layer, the width D of the inner surface of the guide groove, and the distance L between two adjacent guide grooves satisfies: Where R is the proportionality coefficient.

[0013] Preferably, the adsorption guiding layer comprises a first layered oxide layer and a first polyanionic material layer that are interconnected.

[0014] Preferably, the current-guiding protective outer layer comprises an interconnected Prussian blue-like material layer and a second conductive agent layer.

[0015] Preferably, the current-guiding protective outer layer comprises a second layered oxide layer, a second polyanionic material layer, and a third conductive agent layer that are interconnected.

[0016] This utility model also discloses a battery cell, including the electrode structure described above.

[0017] This utility model also discloses a secondary battery, including the aforementioned battery cell.

[0018] The beneficial effects of this utility model are as follows: This technical solution uses the concave guiding effect of the flow channel to accelerate the ion transport flow rate and increase the ion transport volume, thereby effectively avoiding excessive electrolyte immersion time and reducing electrolyte loss; thus improving its stability in use; extending its service life and reducing battery manufacturing costs; in addition, the protective effect of the flow-guiding outer layer on the adsorption guiding layer, combined with the rapid ion conduction of the flow-guiding outer layer and the synergistic effect of the adsorption guiding layer, ensures the stability of use and maintains a high energy density; thereby improving the rate performance and cycle performance of the battery. Attached Figure Description

[0019] The following will refer to the appendix. Figures 1-4 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0020] Figure 1 This is a schematic diagram of the electrode structure according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the electrode structure according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the current-guiding protective outer layer in the electrode structure of one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the flow-guiding protective outer layer in the electrode structure of another embodiment of the present invention.

[0024] In the figure: 1-Conductive substrate layer; 2-Adsorption and guiding layer; 21-First layered oxide layer; 22-First polyanionic material layer; 23-First conductive agent layer; 3-Current guiding and protective outer layer; 311-Prussian blue material layer; 312-Second conductive agent layer; 313-Second layered oxide layer; 314-Second polyanionic material layer; 315-Third conductive agent layer; 316-Adhesive layer; 301-Current guiding groove; 302-Current guiding slope; AA-Length direction. Detailed Implementation

[0025] Unless otherwise defined, 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0030] The following is in conjunction with the appendix Figures 1-4 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0031] like Figure 1 As shown, in one embodiment of this utility model, the electrode structure includes a conductive substrate layer 1, an adsorption guiding layer 2, and a current-guiding protective outer layer 3. The adsorption guiding layer 2 is connected to at least one surface of the conductive substrate layer 1. The current-guiding protective outer layer 3 is connected to the surface of the adsorption guiding layer 2 away from the conductive substrate layer 1. At least two current-guiding grooves 301 are provided on the surface of the current-guiding protective outer layer 3 away from the adsorption guiding layer 2. All current-guiding grooves 301 are arranged equidistantly along the length direction of the surface of the current-guiding protective outer layer 3. Each current-guiding groove 301 extends along the width direction of the surface of the current-guiding protective outer layer 3. In some embodiments, the conductive substrate layer 1 is a conductive metal layer; it can be aluminum. Further, the loading on one side of the adsorption guiding layer 2 is controlled at 20–40 mg / cm². 2 The loading on both sides is controlled at 40-80 mg / cm³. 2 The loading of the outer layer 3, which provides flow guidance and protection, is controlled at 5–20 mg / cm³ on one side. 2 The loading on both sides is controlled at 10–40 mg / cm³. 2 .

[0032] The technical solution of this utility model utilizes the concave guiding effect of the flow channel to accelerate the ion transport flow rate and increase the ion transport volume, thereby effectively avoiding excessive electrolyte immersion time and reducing electrolyte loss; thus improving its stability in use, extending its service life, and reducing battery manufacturing costs; in addition, the protective effect of the flow-guiding outer layer on the adsorption guiding layer, combined with the synergistic effect of the rapid ion conduction of the flow-guiding outer layer and the adsorption guiding layer, ensures the stability of use and maintains a high energy density; thereby improving the rate performance and cycle performance of the battery.

[0033] Specifically, in some implementations, such as Figure 1 and 2As shown, the inner wall of the flow channel 301 is provided with a flow-guiding slope 302; the width of the flow channel 301 facing the adsorption and guiding layer 2 is smaller than the width of the flow channel 301 away from the adsorption and guiding layer 2. That is, the size of the inner part of the flow channel 301 facing the adsorption and guiding layer 2 is smaller than the size of the opening of the outer part of the flow channel 301, so as to form a V-shaped or U-shaped groove. This structure can quickly evaporate the moisture in the electrode during baking and guide the electrolyte to the narrow inner part as much as possible and quickly during electrolyte injection through the special opening design, thereby improving the problems of difficult baking of thick electrodes, long immersion time after electrolyte injection, and electrolyte loss, and thus reducing the battery manufacturing cost.

[0034] In some implementation methods, such as Figure 2 As shown, the relationship between the depth h of the flow channel 301 and the thickness H of the flow-guiding protective outer layer 3 satisfies: h ≤ H. This structure, through the flow channel 301 that does not penetrate the thickness of the flow-guiding protective outer layer 3, can improve the protection performance of the adsorption guiding layer 2, and can also guide the electrolyte to the inner part as much as possible and quickly, thereby improving problems such as difficult baking of thick electrodes, long immersion time after electrolyte injection, and electrolyte loss, and thus reducing battery manufacturing costs.

[0035] Specifically, in some implementations, such as Figure 2 As shown, the thickness H of the outer protective layer 3 satisfies: 5μm≤H≤50μm; the width D inside the flow channel 301 satisfies: 0.08mm≤D≤2mm; the distance L between two adjacent flow channels 301 satisfies: 0.5mm≤L≤5mm. This structure, through the appropriately sized outer protective layer 3 and flow channels 301, along with all flow channels 301 in suitable assembly positions, ensures the protective performance of the adsorption guiding layer 2. It also allows for the rapid and abundant flow of electrolyte to the inner part, thereby improving problems such as difficult baking of thick electrodes, long immersion time after electrolyte injection, and electrolyte loss, thus reducing battery manufacturing costs; furthermore, it improves the stability of use, as well as the rate performance and cycle performance of the battery.

[0036] Specifically, in some implementations, such as Figure 2 As shown, the relationship between the thickness H of the outer protective layer 3, the width D inside the flow guide groove 301, and the distance L between two adjacent flow guide grooves 301 satisfies: Where R is a proportionality coefficient (adjusted according to the actual process). Further, R can range from 50 μm / mm to 300 μm / mm. When D and L are in millimeters (mm) and H is in micrometers (μm), a proportionality coefficient R is needed to adjust the dimensions. For example: assuming D = 0.13 mm, L = 1 mm, and H = 18.4 μm, then R ≈ 160 μm / mm. Assuming D = 0.09 mm, L = 3 mm, and H = 12.7 μm, then R ≈ 145 μm / mm (adjusted according to the actual process).

[0037] Furthermore, the etching process of the guide groove 301: the etching depth is controlled by adjusting the linewidth and line spacing. Electrode structure design: ensuring the mechanical stability of the line structure (depth ratio). and spacing ratio (Constraints must be met). Empirical formula: R is fitted using experimental data and used for process optimization. Constraints: Width-to-depth ratio limit: (Typical value, to avoid the collapse of the coating structure in the material area); Line spacing requirement: L≥D (to prevent overlap).

[0038] Specifically, in some implementations, such as Figure 1 and 2 As shown, the adsorption guiding layer 2 includes a first layered oxide layer 21 and a first polyanionic material layer 22 that are interconnected; and the first layered oxide layer 21 is Na. x1 AO2 material; the first polyanionic material layer 22 is Na x2 T y1 (X a1 O b1 ) z1 Z w1 Materials; wherein A is selected from Ni, Co, Mn, Fe, Cu, Ti, and V; x1 satisfies: 0 < x1 ≤ 1; T is selected from Ti, V, Cr, Mn, Fe, Ca, Mg, Al, and Nb; X is selected from Si, S, P, As, B, Mo, W, and Ge; Z is selected from F, O, and OH; x2 satisfies: 0 < x2 ≤ 10; y1 satisfies: 0 < y1 ≤ 6; a1 satisfies: 1 ≤ a1 ≤ 3; b1 satisfies: 0 < b1 ≤ 12; z1 satisfies: 0 < z1 ≤ 10; w1 satisfies: 0 ≤ w1 ≤ 10. Further, in some embodiments, such as... Figure 2As shown, a first layered oxide layer 21 and a first polyanionic material layer 22 are stacked; and the first layered oxide layer 21 is disposed between the first polyanionic material layer 22 and the current-conducting protective outer layer 3. This structure, through the synergistic effect of the combined use of the first layered oxide layer 21 and the first polyanionic material layer 22, allows the porous structure of the polyanionic material to promote electrolyte absorption and rapid sodium ion diffusion, effectively improving the fast-charging capability and cycle life of the sodium-ion battery. Furthermore, in some embodiments, such as... Figure 2 As shown, the adsorption guiding layer 2 further includes a first conductive agent layer 23; the first conductive agent layer 23 is disposed between the first layered oxide layer 21 and the first polyanionic material layer 22; the first conductive agent layer 23 is disposed between the first layered oxide layer 21 and the current-guiding protective outer layer 3 and / or the first conductive agent layer 23 is disposed between the first polyanionic material layer 22 and the conductive substrate layer 1. Preferably, the first conductive agent layer 23 is one of acetylene conductive carbon black, furnace conductive carbon black, conductive graphite, carbon nanotubes, and graphene. Further, in some embodiments, such as... Figure 2 As shown, the adsorption guiding layer 2 also includes an adhesive; the adhesive connects the first layered oxide layer 21 and the first conductive agent layer 23, as well as the first conductive agent layer 23 and the first polyanionic material layer 22; and the adhesive is one of PVDF, PAA, PAI, and PMMA.

[0039] Specifically, in some implementations, such as Figure 1 , 2 As shown in Figure 3, the current-conducting protective outer layer 3 includes an interconnected Prussian blue-like material layer 311 and a second conductive agent layer 312; and the Prussian blue-like material layer 311 is E x3 M1[M2(CN)6] 1-y3 ·□ y3 ·nH2O: where x3 satisfies: 0≤x3≤2, y3 satisfies: 0≤y3<1; n satisfies: 1≤n. E is an alkali metal ion; M1 and M2 are transition metal ions with different coordination; □ is a [M2(CN)6] vacancy; the second conductive agent layer 312 is one of conductive carbon, acetylene black, VGCF, KS-6, CNT, and graphene. Further, such as Figure 2 and 3 As shown, a Prussian blue-based material layer 311 and a second conductive agent layer 312 are stacked; and the second conductive agent layer 312 is disposed between the Prussian blue-based material layer 311 and the adsorption guiding layer 2. Furthermore, the alkali metal ion can be Na+. + K +M1 coordinates with N, and M2 coordinates with C, preferably Mn, Fe, Co, Ni, Cu, Zn, Cr, etc. After the active substance a slurry is coated onto the surface of carbon-coated aluminum foil using a double-lip extrusion coating device, the flow-guiding outer layer 3 is coated onto the surface of the adsorption guiding layer 2. After baking in an oven, the electrode is rolled; then, the surface of the flow-guiding outer layer 3 is rolled to form the flow-guiding groove 301. The rollers used in the rolling device have additional protruding scribing components on their surface and are treated with an online dust collection device to obtain the target electrode structure. This structure, through the material properties of the flow-guiding outer layer 3 combined with the surface flow-guiding groove 301, enhances its Na... + It has the ability to transmit signals and effectively promote electrolyte absorption, shorten electrolyte wetting time, and reduce manufacturing costs.

[0040] Specifically, in some implementations, such as Figure 1 , 2 As shown in Figure 4, the thickness of the flow-guiding outer layer 3 is less than the thickness of the adsorption guiding layer 2; and the flow-guiding outer layer 3 includes a second layered oxide layer 313, a second polyanionic material layer 314, and a third conductive agent layer 315 that are interconnected; the second layered oxide layer 313 is Na x4 AO2 material; the second polyanionic material layer 314 is Na. x5 T y4 (X a2 O b2 ) z2 Z w2 Materials: A is selected from Ni, Co, Mn, Fe, Cu, Ti, and V; x4 satisfies: 0 < x4 ≤ 1; T is selected from Ti, V, Cr, Mn, Fe, Ca, Mg, Al, and Nb; X is selected from Si, S, P, As, B, Mo, W, and Ge; Z is selected from F, O, and OH; x5 satisfies: 0 < x5 ≤ 8; y1 satisfies: 0 < y4 ≤ 5; a2 satisfies: 1 ≤ a2 ≤ 3; b2 satisfies: 0 < b2 ≤ 12; z2 satisfies: 0 < z2 ≤ 9; w2 satisfies: 0 ≤ w2 ≤ 9; the third conductive agent layer 315 is selected from acetylene conductive carbon black, furnace conductive carbon black, conductive graphite, carbon nanotubes, and graphene. This structure, through the synergistic effect of the composite use of the second layered oxide layer 313 and the second polyanionic material layer 314, allows the porous structure of the polyanionic material to promote electrolyte absorption and rapid sodium ion diffusion, effectively improving the fast-charging capability and cycle life of sodium-ion batteries. Furthermore, in some embodiments, such as... Figure 3 As shown in Figure 4, the flow-conducting protective outer layer 3 also includes an adhesive; the adhesive is connected between the first layered oxide layer 21 and the first conductive agent layer 23, and between the first conductive agent layer 23 and the first polyanionic material layer 22; and the adhesive is one of PVDF, PAA, PAI, and PMMA.

[0041] Example 1

[0042] Preparation of the positive electrode structure:

[0043] The prepared adsorption guiding layer 2 and flow guiding protective outer layer 3 are added to coating transfer tanks a and b, respectively. The adsorption guiding layer 2 slurry is coated onto the surface of carbon-coated aluminum foil using a double-lip extrusion coating device, and the flow guiding protective outer layer 3 is coated onto the surface of the adsorption guiding layer 2. After baking in an oven, the electrode sheet is rolled. Then, surface rolling treatment is performed on the coating surface of the flow guiding protective outer layer 3 to form flow grooves 301. The rollers used in the rolling device have additional protruding scribing components on their surface, and after treatment by an online dust collection device, the target electrode structure is obtained. The relationship between H, D, and L is as follows: R is a proportionality coefficient (adjusted according to the actual process); the outer protective layer 3 consists of an interconnected Prussian blue material layer 311 and a second conductive agent layer 312.

[0044] Battery fabrication: A bare cell is prepared by stacking / winding negative electrode sheets, separator, and positive electrode sheets. The bare cell is then welded, packaged, baked, and injected with a certain amount of electrolyte. After standing and formation, a sodium-ion battery is obtained.

[0045] Room temperature cycle performance test: The battery was charged and discharged at 25℃, that is, first charged to 3.7V with a 1C current, and then discharged to 1.5V with a 1C current. The discharge capacity of the first week was recorded. Then the battery was subjected to 1C / 1C charge and discharge cycles for 100 cycles and 500 cycles. The battery discharge capacity of the 100th and 500th cycles was recorded. The discharge capacity of the 100th and 500th cycles was divided by the discharge capacity of the first week to obtain the capacity retention rate of the 100th and 500th cycles.

[0046] Example 2

[0047] The difference between Example 2 and Example 1 lies in the relationship between H, D, and L:

[0048]

[0049] Example 3

[0050] The difference between Example 3 and Example 1 is: the relationship between H, D and L: the current-conducting protective outer layer 3 is a second layered oxide layer 313, a second polyanionic material layer 314 and a third conductive agent layer 315 that are interconnected.

[0051] Comparative Example 1

[0052] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not have the structure of adsorption guiding layer 2.

[0053] Comparative Example 2

[0054] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not have the structure of the flow-guiding protective outer layer 3.

[0055] Comparative Example 3

[0056] The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not have the structure of adsorption guiding layer 2 and flow guiding protective outer layer 3.

[0057] Room temperature rate charging performance test table

[0058]

[0059] Room temperature cycling performance test table

[0060] Group 100-cycle capacity retention 500-cycle capacity retention Example 1 99％ 97％ Example 2 99％ 96％ Example 3 99％ 95％ Comparative Example 1 98％ 92％ Comparative Example 2 98％ 91％ Comparative Example 3 98％ 91％

[0061] This utility model also proposes a battery cell, which includes a first electrode, a second electrode, and an insulating member disposed between the first electrode and the second electrode. The first electrode and / or the second electrode are electrode structures. The specific structure of this electrode structure is described in the above embodiments. Since this battery cell adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The first electrode is either a positive electrode or a negative electrode; the second electrode is either a positive electrode or a negative electrode. When the first electrode is a positive electrode, it is that electrode structure; the second electrode is a negative electrode.

[0062] The positive electrode includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode tab connected to the positive coating area. The positive coating area is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. The material of the positive current collector can be aluminum. The positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide used in lithium batteries, or layered oxides, polyanionic compounds, Prussian blue (white), etc. used in sodium batteries. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative coating area and a negative electrode tab connected to the negative coating area. The negative coating area is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The negative electrode current collector can be made of copper or aluminum. The negative electrode active material layer includes the negative electrode active material, which can be graphite, silicon-carbon, or silicon-oxygen used in lithium batteries, or carbon or silicon, or hard carbon or soft carbon used in sodium batteries. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0063] This utility model also proposes a secondary battery, which includes a battery cell. The specific structure of the battery cell is as described in the above embodiments. Since this secondary battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0064] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after being discharged, allowing the active materials to be reactivated and reused. Utilizing the reversibility of chemical reactions, a new battery can be constructed; that is, after a chemical reaction converts into electrical energy, the electrical energy can be used to repair the chemical system, and then the chemical reaction can be converted back into electrical energy. Therefore, it is called a secondary battery (rechargeable battery). The main types of rechargeable batteries on the market include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, and sodium-ion batteries.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0066] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An electrode structure, characterized in that: It includes a conductive substrate layer, an adsorption and guiding layer, and a current-guiding protective outer layer; the adsorption and guiding layer is connected to at least one surface of the conductive substrate layer; the current-guiding protective outer layer is connected to the surface of the adsorption and guiding layer away from the conductive substrate layer; and the surface of the current-guiding protective outer layer away from the adsorption and guiding layer is provided with at least two current-guiding grooves; all the current-guiding grooves are arranged along the length direction of the surface of the current-guiding protective outer layer; each current-guiding groove extends along the width direction of the surface of the current-guiding protective outer layer.

2. The electrode structure according to claim 1, characterized in that: The inner wall of the guide channel is provided with a guide slope; The width of the guide groove on the guide slope facing the adsorption guide layer is smaller than the width of the guide groove on the guide slope away from the adsorption guide layer.

3. The electrode structure according to claim 1, characterized in that: The relationship between the depth h of the flow guide groove and the thickness H of the flow guide protective outer layer satisfies: h ≤ H; And / or the thickness H of the flow-guiding protective outer layer satisfies: 5μm≤H≤50μm.

4. The electrode structure according to claim 1, characterized in that: The width D inside the flow channel satisfies: 0.08mm≤D≤2mm; And / or, the distance between two adjacent guide channels is L, where L satisfies: 0.5mm≤L≤5mm.

5. The electrode structure according to claim 1, characterized in that: The relationship between the thickness H of the outer protective layer, the width D of the inner surface of the guide groove, and the distance L between two adjacent guide grooves satisfies: Where R is the proportionality coefficient.

6. The electrode structure according to any one of claims 1 to 5, characterized in that: The adsorption guiding layer includes a first layered oxide layer and a first polyanionic material layer that are interconnected.

7. The electrode structure according to any one of claims 1 to 5, characterized in that: The flow-guiding protective outer layer includes an interconnected Prussian blue-like material layer and a second conductive agent layer.

8. The electrode structure according to any one of claims 1 to 5, characterized in that: The current-guiding protective outer layer includes a second layered oxide layer, a second polyanionic material layer, and a third conductive agent layer that are interconnected.

9. A battery cell, characterized in that: Includes the electrode structure described in any one of claims 1 to 8.

10. A secondary battery, characterized in that: Includes the battery cell described in claim 9.

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