Electrode plate and battery

Abstract

The utility model relates to the technical field of batteries, in particular to an electrode plate and a battery. The solar cell comprises a current collector, an embedded layer and a conductive layer, the current collector comprises a concave surface, and the concave surface is provided with a concave structure. The embedded layer is at least partially embedded in the recessed structure, and the conductive layer covers the surface, away from the recessed surface, of the embedded layer. When in use, the current collector has a groove channel structure, so that the adhesive force between the current collector and the embedded layer can be improved, and the powder falling phenomenon of the electrode pole piece is reduced. The silicon-based material in the embedding layer can increase the embedding capacity of sodium ions, and the silicon-based material can comprise silicon nanoparticles, silicon nanowires and the like. The conductive layer has good conductivity and is helpful for improving the electron conduction performance, and the carbon-based material can comprise graphene, carbon nanotubes and the like. The bonding force of the embedded layer is larger than that of the conductive layer, and it can be further guaranteed that the embedded layer is not prone to being separated from the current collector and the conductive layer.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to electrode plates and batteries. Background Art

[0002] In the prior art, the powder shedding phenomenon of the negative electrode of sodium ion batteries is very serious. This is because the radius of sodium ions is large, resulting in a large volume change during the embedding and de-embedding process, which may cause physical deformation between the negative electrode material and the current collector, increasing the risk of powder shedding. Therefore, how to solve the problem of electrode powder shedding is a technical problem that needs to be solved in this field. Utility Model Content

[0003] In view of this, the present application provides an electrode plate and a battery, which can reduce the powder shedding phenomenon of the electrode.

[0004] In a first aspect, the present application provides an electrode plate, comprising: a current collector, comprising a recessed surface, on which a recessed structure is provided; an embedded layer, the embedded layer being at least partially embedded in the recessed structure, the embedded layer comprising a silicon-based material; and a conductive layer covering a surface of the embedded layer away from the recessed surface, the conductive layer comprising a carbon-based material; wherein the adhesion force of the embedded layer is greater than the adhesion force of the conductive layer.

[0005] In combination with the first aspect, in a possible implementation manner, the embedding layer includes: a ligand embedded in the recessed structure.

[0006] In combination with the first aspect, in a possible implementation manner, the embedded layer further includes: a matching layer covering the recessed surface, and the matching body is connected to the matching layer.

[0007] In combination with the first aspect, in a possible implementation, the recessed structure includes a plurality of strip-shaped grooves, the fitting body includes a plurality of embedded strips, and the plurality of embedded strips are embedded in the plurality of strip-shaped grooves in a one-to-one correspondence.

[0008] In combination with the first aspect, in a possible implementation manner, the lengths and shapes of the plurality of strip-shaped grooves are the same.

[0009] In combination with the first aspect, in a possible implementation manner, there are multiple recessed surfaces, and the multiple recessed surfaces are arranged on different sides of the current collector.

[0010] In combination with the first aspect, in a possible implementation manner, the current collector includes copper foil or aluminum foil, and the thickness of the current collector is any value between 5 μm and 20 μm.

[0011] In combination with the first aspect, in a possible implementation manner, the conductive layer includes graphene or carbon nanotubes.

[0012] In combination with the first aspect, in a possible implementation, it further includes: an elastic layer covering the surface of the conductive layer away from the embedded layer, the elastic layer includes a high molecular polymer, and the adhesive force of the embedded layer is greater than the adhesive force of the elastic layer.

[0013] In a second aspect, the present application provides a battery, comprising the aforementioned electrode plate.

[0014] When the present application is in use, the current collector has a groove channel structure, which can improve the adhesive adhesion between the current collector and the embedded layer and reduce the powder loss of the electrode pole piece. The silicon-based material in the embedded layer can increase the embedding capacity of sodium ions, and the silicon-based material may include silicon nanoparticles, silicon nanowires, etc. The conductive layer has good conductivity, which helps to improve the electronic conduction performance. The carbon-based material may include graphene, carbon nanotubes, etc. The adhesion of the embedded layer is greater than the adhesion of the conductive layer, which can further ensure that the embedded layer is not easy to separate from the current collector and the conductive layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of an electrode plate provided in one embodiment of the present application.

[0016] Figure 2 Shown is a schematic structural diagram of an electrode plate provided in another embodiment of the present application.

[0017] Figure 3 Shown is a schematic structural diagram of an electrode plate provided in another embodiment of the present application.

[0018] Figure 4 Shown is a schematic structural diagram of an electrode plate provided in another embodiment of the present application.

[0019] Figure 5 Shown is a schematic structural diagram of an electrode plate provided in another embodiment of the present application.

[0020] Figure 6 Shown is a schematic structural diagram of an electrode plate provided in another embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] Exemplary electrode plates are as follows:

[0023] Figure 1 The figure shows a schematic diagram of the structure of an electrode plate provided in one embodiment of the present application. The present application provides an electrode plate. In one embodiment, as Figure 1 As shown, the electrode plate includes: a current collector 1, an embedded layer 2 and a conductive layer 3. The current collector 1 includes a concave surface 101, and a concave structure 102 is provided on the concave surface 101. The embedded layer 2 is at least partially embedded in the concave structure 102, and the embedded layer 2 includes a silicon-based material. The conductive layer 3 covers the surface of the embedded layer 2 away from the concave surface 101, and the conductive layer 3 includes a carbon-based material. The adhesive force of the embedded layer 2 is greater than the adhesive force of the conductive layer 3.

[0024] In this embodiment, the current collector 1 has a groove channel structure, which can improve the bonding adhesion between the current collector 1 and the embedded layer 2 and reduce the powder loss of the electrode plate. The silicon-based material in the embedded layer 2 can increase the embedding capacity of sodium ions, and the silicon-based material may include silicon nanoparticles, silicon nanowires, etc. The conductive layer 3 has good conductivity, which helps to improve the electronic conduction performance. The carbon-based material may include graphene, carbon nanotubes, etc. The adhesion of the embedded layer 2 is greater than the adhesion of the conductive layer 3, which can further ensure that the embedded layer 2 is not easy to separate from the current collector 1 and the conductive layer 3.

[0025] Figure 2 FIG. 1 is a schematic diagram of the structure of an electrode plate provided by another embodiment of the present application. Figure 2 As shown, the embedded layer 2 includes a ligand 201, which is embedded in the recessed structure 102. When this embodiment is used, the embedded layer 2 is only provided with the ligand 201 embedded in the recessed structure 102, which can reduce the thickness of the embedded layer 2 and reduce the material used in the embedded layer 2.

[0026] Figure 3 FIG. 1 is a schematic diagram of the structure of an electrode plate provided by another embodiment of the present application. Figure 3 As shown, the embedded layer 2 further includes a matching layer 202, which covers the concave surface 101, and the matching body 201 is connected to the matching layer 202. When this embodiment is used, the matching layer 202 and the matching body 201 are connected to each other, which can improve the structural strength of the embedded layer 2.

[0027] Figure 4 FIG. 1 is a schematic diagram of the structure of an electrode plate provided by another embodiment of the present application. Figure 4 As shown, the recessed structure 102 includes a plurality of strip-shaped grooves 1021 , and the matching body 201 includes a plurality of embedded strips, and the plurality of embedded strips are embedded in the plurality of strip-shaped grooves 1021 in a one-to-one correspondence.

[0028] In one embodiment, the lengths and shapes of the plurality of strip-shaped grooves 1021 are the same.

[0029] Figure 5 FIG. 1 is a schematic diagram of the structure of an electrode plate provided by another embodiment of the present application. Figure 5 As shown, there are multiple recessed surfaces 101, which are arranged on different sides of the current collector 1. In this embodiment, the current collector 1 has a double-sided recessed structure, and the two recessed surfaces 101 are respectively located on opposite sides of the current collector 1, and the two recessed surfaces 101 are covered with an embedded layer 2.

[0030] Specifically, the current collector 1 includes copper foil or aluminum foil, and the thickness of the current collector 1 is any value between 5 μm and 20 μm. When used, a dense oxide thin layer can be generated to protect the current collector 1 from corrosion.

[0031] Specifically, the conductive layer 3 includes graphene or carbon nanotubes to have good conductivity, which helps to improve the electronic conduction performance.

[0032] Figure 6 FIG. 1 is a schematic diagram of the structure of an electrode plate provided by another embodiment of the present application. Figure 6 As shown, the electrode plate further includes an elastic layer 4, which covers the surface of the conductive layer 3 away from the embedded layer 2, and the elastic layer 4 includes a high molecular polymer, which includes an elastic polyurethane or an acrylic elastomer, and the adhesive force of the embedded layer 2 is greater than the adhesive force of the elastic layer 4. In this embodiment, the mechanical stress caused by volume expansion can be alleviated, the relative structural stability is maintained, and the good insulation performance is provided, which helps to provide a certain insulation layer in the battery.

[0033] An exemplary battery is as follows:

[0034] The present application also provides a battery, including the aforementioned electrode plate. When the battery is used, the groove channel structure can improve the bonding adhesion between the current collector and the embedded layer, and reduce the powder loss of the electrode plate. The silicon-based material in the embedded layer can increase the embedding capacity of sodium ions, and the silicon-based material may include silicon nanoparticles, silicon nanowires, etc. The conductive layer has good conductivity, which helps to improve the electronic conduction performance.

[0035] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0036] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0037] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0038] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features of this utility model.

[0039] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An electrode plate, It is characterized in that include: A current collector, comprising a concave surface, wherein a concave structure is provided on the concave surface; an embedding layer, the embedding layer being at least partially embedded in the recessed structure, the embedding layer comprising a silicon-based material; as well as An electrically conductive layer covering a surface of the embedded layer away from the recessed surface, wherein the electrically conductive layer comprises a carbon-based material; Wherein, the adhesive force of the embedding layer is greater than the adhesive force of the conductive layer.

2. The electrode sheet according to claim 1, It is characterized in that The embedding layer comprises: The ligand is embedded in the recessed structure.

3. The electrode sheet according to claim 2, It is characterized in that The embedding layer further comprises: A matching layer is covered on the concave surface, and the matching body is connected to the matching layer.

4. The electrode sheet according to claim 2, It is characterized in that The recessed structure includes a plurality of strip-shaped grooves, and the fitting body includes a plurality of embedded strips, and the plurality of embedded strips are embedded in the plurality of strip-shaped grooves in a one-to-one correspondence.

5. The electrode sheet according to claim 4, It is characterized in that The lengths and shapes of the plurality of strip-shaped grooves are the same.

6. The electrode sheet according to claim 4, It is characterized in that There are multiple recessed surfaces, and the multiple recessed surfaces are arranged on different sides of the current collector.

7. The electrode sheet according to claim 1, It is characterized in that The current collector includes copper foil or aluminum foil, and the thickness of the current collector is any value between 5 μm and 20 μm.

8. The electrode sheet according to claim 1, It is characterized in that The conductive layer includes graphene or carbon nanotubes.

9. The electrode sheet according to claim 1, It is characterized in that Also includes: The elastic layer covers the surface of the conductive layer away from the embedded layer. The elastic layer comprises a high molecular polymer. The adhesive force of the embedded layer is greater than the adhesive force of the elastic layer.

10. A battery, It is characterized in that Comprising the electrode plate as claimed in any one of claims 1 to 9.

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