Battery pole piece and battery

Abstract

The utility model discloses a battery pole piece and a battery. The battery pole piece comprises a solid electrolyte layer, a cross-linking layer, a second active material layer, a first active material layer and a current collector which are sequentially laminated and distributed, wherein adjacent two of the solid electrolyte layer, the cross-linking layer, the second active material layer and the first active material layer are in point-line contact, line-line contact and / or line-surface contact, and the first active material layer and the current collector are in point-surface contact and / or line-surface contact. According to the battery pole piece disclosed by the utility model, the contact form between different contact surfaces can be flexibly adjusted, and the adaptation and the contact effect between interfaces can be changed, so that the interface contact resistance of a solid-state battery is reduced, the internal resistance of the battery is reduced, the impedance of the solid-state battery is improved, and the cycle performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery pole piece and a battery with the battery pole piece. Background Art

[0002] In lithium batteries, compared with liquid batteries, the solid-solid contact interface of solid-state batteries has higher contact resistance and poorer ion transmission performance, which will lead to reduced performance of solid-state batteries, such as increased internal resistance of the battery, reduced charging and discharging efficiency, and accelerated capacity decay. Existing solid-state batteries have limited effect on improving the solid-solid interface impedance, and there is still room for improvement. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pole piece, which can flexibly change the contact effect between interfaces, thereby reducing the interface contact resistance of the solid-state battery, thereby reducing the internal resistance of the battery, improving the impedance of the solid-state battery, improving the cycle performance, and solving the problem of reduced solid-state battery performance caused by high solid-solid contact interface resistance of the solid-state battery.

[0004] According to the battery pole piece of the embodiment of the utility model, it includes a solid electrolyte layer, a cross-linked layer, a second active material layer, a first active material layer and a current collector which are stacked and distributed in sequence; wherein, the solid electrolyte layer, the cross-linked layer, the second active material layer and the first active material layer are in point-line contact, line-line contact and / or line-surface contact between adjacent two of them, and the first active material layer is in point-surface contact and / or line-surface contact with the current collector.

[0005] According to the battery pole piece of the embodiment of the utility model, by arranging a solid electrolyte layer, a cross-linking layer, a second active material layer, a first active material layer and a current collector which are stacked and distributed in sequence, and the contact form of the contact surface between two adjacent ones is set to non-surface contact, the contact effect between the interfaces can be flexibly changed, thereby reducing the interface contact resistance of the solid-state battery, and then reducing the internal resistance of the battery, increasing the impedance of the solid-state battery, improving the cycle performance, and solving the problem of reduced performance of the solid-state battery due to high solid-solid contact interface resistance of the solid-state battery.

[0006] According to the battery pole pieces of some embodiments of the utility model, the cross-linked layer is constructed in a three-dimensional spatial network and includes a plurality of cross-distributed linear structures, and the linear structures are in pressure contact with the solid electrolyte layer and the second active material layer.

[0007] According to the battery pole pieces of some embodiments of the present invention, the solid electrolyte layer has pores formed at least on one side facing the cross-linked layer, and at least a portion of the cross-linked layer extends into the pores to contact the solid electrolyte layer.

[0008] According to the battery pole pieces of some embodiments of the present invention, the pores have a pore diameter of R and a pore depth of D, which satisfy: 0.5 μm ≤ R ≤ 500 μm, 0.5 μm ≤ D ≤ 100 μm.

[0009] According to the battery pole pieces of some embodiments of the present utility model, the solid electrolyte layer includes at least one of an oxide solid electrolyte and a sulfide solid electrolyte.

[0010] According to the battery pole piece of some embodiments of the utility model, the oxide solid electrolyte is Li 1.5 A l0.5 Ti 1.5 (PO4)3、Li 0.5 La 0.5 TiO3、Li 1.4 A l0.4 Ti 1.6 (PO4)3 or Li 7-3x-y Al x La3Zr2-yNbyO 12 , and satisfy: 0≤x≤0.3, 0≤y≤0.5;

[0011] And / or, the oxide solid electrolyte is Li4-xGe1-xP x S4 or Li3+5zP1-zS 12 , and satisfies: 0<x<1, 0<z<0.27.

[0012] According to the battery pole pieces of some embodiments of the present invention, the thickness of the solid electrolyte layer is d1, and satisfies 0.1 μm≤d1≤100 μm; and / or the thickness of the cross-linked layer is d2, and satisfies 0.1 μm≤d2≤20 μm.

[0013] According to the battery pole pieces of some embodiments of the present invention, the thickness of the first active material layer is d3; wherein, when the first active material layer is a positive electrode material, 30 μm ≤ d3 ≤ 250 μm is satisfied, and when the first active material layer is a negative electrode material, 30 μm ≤ d3 ≤ 200 μm is satisfied.

[0014] According to the battery pole piece of some embodiments of the present utility model, the thickness of the second active material layer is d4, which satisfies 1μm≤d4≤d3 / 2+10μm.

[0015] The utility model also provides a battery, comprising any one of the battery pole pieces described above.

[0016] The advantages of the battery and the above-mentioned battery pole piece compared with the prior art are the same and will not be repeated here.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a schematic structural diagram of a battery electrode according to an embodiment of the utility model.

[0020] Reference numerals:

[0021] Battery pole piece 100,

[0022] Solid electrolyte layer 1 , crosslinking layer 2 , second active material layer 3 , first active material layer 4 , current collector 5 . DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Reference below Figure 1 A battery pole piece 100 according to an embodiment of the utility model is described. The battery pole piece 100 can flexibly change the contact form and contact effect between interfaces, thereby reducing the interface contact resistance of the solid-state battery, and then reducing the internal resistance of the battery, improving the impedance of the solid-state battery, improving the cycle performance, and solving the problem of reduced solid-state battery performance caused by high solid-solid contact interface resistance of the solid-state battery.

[0027] like Figure 1 As shown, the battery pole piece 100 according to the embodiment of the utility model includes a solid electrolyte layer 1, a cross-linking layer 2, a second active material layer 3, a first active material layer 4 and a current collector 5.

[0028] The solid electrolyte layer 1, the cross-linked layer 2, the second active material layer 3, the first active material layer 4 and the current collector 5 are stacked and distributed in sequence, that is, the cross-linked layer 2 is located between the solid electrolyte layer 1 and the second active material layer 3, one side of which is in contact with the solid electrolyte layer 1, and the other side is in contact with the cross-linked layer 2, the second active material layer 3 is located between the cross-linked layer 2 and the first active material layer 4, one side of which is in contact with the cross-linked layer 2, and the other side is in contact with the first active material layer 4, and the first active material layer 4 is located between the second active material layer 3 and the current collector 5, one side of which is in contact with the second active material layer 3, and the other side is in contact with the current collector 5.

[0029] In this way, a multi-layer interface distribution is formed to transmit ions, improve the ion transmission effect and the movement rate of electrons, thereby improving the problem of poor interface contact in solid-state batteries.

[0030] Among them, the solid electrolyte layer 1, the cross-linking layer 2, the second active material layer 3, and the first active material layer 4 are in point-line contact, line-line contact and / or line-surface contact between adjacent two layers, and the first active material layer 4 is in point-surface contact and / or line-surface contact with the current collector 5.

[0031] That is to say, when one side of the solid electrolyte layer 1 contacts one side of the cross-linked layer 2, the contact form between their contact surfaces may be point-line contact, line-line contact and / or line-surface contact. The contact form between the contact surfaces of the solid electrolyte layer 1 and the cross-linked layer 2 mainly depends on the material shape of the solid electrolyte. When the solid electrolyte in the solid electrolyte layer 1 is granular, the solid electrolyte layer 1 and the cross-linked layer 2 are in point-line contact. When the solid electrolyte is in sheet or surface form, the solid electrolyte layer 1 and the cross-linked layer 2 are in line-line contact and / or line-surface contact.

[0032] When the other side of the cross-linked layer 2 contacts one side of the second active material layer 3, the contact form between the contact surfaces can be point-line contact, line-line contact and / or line-surface contact. The contact form between the cross-linked layer 2 and the contact surface of the second active material layer 3 can be specifically regulated by controlling the type of conductive agent added in the second active material layer, thereby controlling the contact effect between the two, increasing the contact points between the two, and helping to reduce the internal resistance of the solid-state battery and improve the electrochemical performance of the battery. Similarly, when the other side of the second active material layer 3 contacts one side of the first active material layer 4, the contact form between the contact surfaces can be point-line contact, line-line contact and / or line-surface contact. The contact form can also be specifically regulated by controlling the type of conductive agent added in the second active material layer 3, increasing the contact points between the two, and reducing the interface contact resistance. In actual design, the conductive agent can be selected as graphene, graphite conductive agent, etc.

[0033] Therefore, the properties of the second active material layer 3 can be adjusted by controlling the type of conductive agent added in the second active material layer 3, so that the positive electrode second active material layer 3 and the negative electrode second active material layer 3 with different characteristics can be better in contact and combination with the cross-linking layer 2 and the first active material layer 4. In other words, the structural contact form of the second active material layer 3 and the cross-linking layer 2 and the first active material layer 4 can be flexibly adjusted according to the properties of the second active material layer 3 as required, the contact point position can be changed, the interface contact effect can be improved, the interface impedance can be reduced, and the internal resistance of the solid-state battery can be reduced.

[0034] When the other side of the first active material layer 4 is in direct contact with one side of the current collector 5, the contact between the contact surfaces may be point-to-surface contact and / or line-to-surface contact. The current collector 5 mainly collects the current generated by the active material to form a larger current output. Therefore, the current collector 5 needs to be in full contact with the first active material layer 4 while reducing the internal resistance. It can be understood that the more contact points there are, the larger the contact area, the closer the contact, the more conducive to the transfer of ions, the higher the conductivity, and the lower the interface contact resistance of the solid-state battery.

[0035] Therefore, by designing a battery pole piece 100 with multi-layer interface contact, the contact form between different contact surfaces can be flexibly adjusted, so that different layers are stacked in a non-face-to-face contact manner, reducing the contact area, changing the tightness and contact effect between the interfaces, thereby reducing the interface contact resistance of the solid-state battery, and then reducing the internal resistance of the battery, increasing the impedance of the solid-state battery, and improving the cycle performance, thereby solving the problem of reduced solid-state battery performance caused by high solid-solid contact interface resistance.

[0036] According to the battery pole piece 100 of the embodiment of the utility model, by arranging the solid electrolyte layer 1, the cross-linking layer 2, the second active material layer 3, the first active material layer 4 and the current collector 5 which are stacked and distributed in sequence, and the contact form of the contact surface between two adjacent ones is set to non-surface contact, the contact form and contact effect between the interfaces can be flexibly changed, thereby reducing the interface contact resistance of the solid-state battery, and then reducing the internal resistance of the battery, improving the impedance of the solid-state battery, improving the cycle performance, and solving the problem of reduced solid-state battery performance caused by high solid-solid contact interface resistance of the solid-state battery.

[0037] In some embodiments, the cross-linked layer 2 is constructed as a three-dimensional network and includes a plurality of cross-distributed linear structures, and the linear structures are in pressure contact with the solid electrolyte layer 1 and the second active material layer 3 .

[0038] The cross-linked layer 2 is constructed into a three-dimensional network, which is conducive to its contact with the solid electrolyte layer 1 and the second active material layer 3, and increases the contact points, such as Figure 1 As shown, the cross-linked layer 2 includes a plurality of cross-distributed linear structures, which are fully distributed in the cross-linked layer 2. The upper surface of the cross-linked layer 2 is in pressure contact with the solid electrolyte layer 1, and the lower surface is in pressure contact with the second active material layer 3. Thus, the contact points between the cross-linked layer 2 and the solid electrolyte layer 1 and the second active material layer 3 are increased, the contact fit is improved, and the contact area is increased, which is beneficial to reduce the contact resistance between the contact interface of the cross-linked layer 2 and the solid electrolyte layer 1 and the second active material layer 3, thereby reducing the internal resistance of the solid-state battery and improving the interface contact problem of the solid-state battery.

[0039] In some embodiments, the solid electrolyte layer 1 has pores formed at least on one side facing the cross-linked layer 2 , and at least a portion of the cross-linked layer 2 extends into the pores to contact the solid electrolyte layer 1 .

[0040] That is, by providing pores on the side surface where the solid electrolyte layer 1 contacts the cross-linked layer 2, the cross-linked layer 2 can extend into the pores and contact the solid electrolyte in the solid electrolyte layer 1, thereby achieving contact between the solid electrolyte of the solid electrolyte layer 1 and the cross-linked layer 2, increasing the contact area between the cross-linked layer 2 and the electrolyte, increasing the contact points, facilitating ion transfer, reducing the interface contact resistance, and thus reducing the internal resistance of the battery.

[0041] It can be understood that the more pores are provided and the larger the pores are, the more contact points there are between the solid electrolyte layer 1 and the cross-linked layer 2, which is more conducive to ion transmission, reduces the interface contact resistance, and improves the interface contact effect.

[0042] In actual design, surface pores can be formed by laser etching the surface of the solid electrolyte layer 1. Laser etching can be performed on both sides of the solid electrolyte layer 1 to facilitate contact with the cross-linking layer 2 and the battery.

[0043] In some embodiments, the pores have a pore diameter of R and a pore depth of D, satisfying: 0.5 μm≤R≤500 μm, 0.5 μm≤D≤100 μm.

[0044] That is, the pore diameter R can be selected to be 0.5μm, 2μm, 30μm, 40μm, 50μm, 80μm, 100μm, 200μm, 300μm, 400μm or 500μm, etc., and the pore depth D can be selected to be 0.5μm, 1μm, 5μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc.

[0045] It can be understood that the larger the value of the pore diameter R, the larger the pore diameter, the smaller the value of the pore diameter R, the smaller the pore diameter, the larger the value of the pore depth D, the deeper the pore depth, and the smaller the value of the pore depth D, the shallower the pore depth. In actual design, the pore diameter R and pore depth D can be flexibly selected and adjusted according to actual needs to achieve the best effect.

[0046] In some embodiments, the solid electrolyte layer 1 includes at least one of an oxide solid electrolyte and a sulfide solid electrolyte.

[0047] That is, the solid electrolyte layer 1 can be an oxide solid electrolyte, or a sulfide solid electrolyte, or a combination of an oxide solid electrolyte and a sulfide solid electrolyte. In actual design, a sulfide solid electrolyte is preferred.

[0048] In some embodiments, the oxide solid electrolyte is Li 1.5 A l0.5 Ti 1.5 (PO4)3、Li 0.5 La 0.5 TiO3、Li 1.4 A l0.4 Ti 1.6 (PO4)3 or Li 7-3x-y Al x La3Zr2-yNbyO 12, and satisfy: 0≤x≤0.3, 0≤y≤0.5, where x can be 0, 0.1, 0.2, 0.3 or other values, and y can be 0, 0.1, 0.2, 0.3, 0.4, 0.5 or other values, which can be flexibly selected according to actual needs.

[0049] And / or, the oxide solid electrolyte is Li4-xGe1-xP x S4 or Li3+5zP1-zS 12 , and satisfy: 0<x<1, 0<z<0.27, where x can be 0.1, 0.3, 0.6, 0.8 or other values, and y can be 0.1, 0.1, 0.2, 0.25 or other values, which can be flexibly selected according to actual needs.

[0050] In some embodiments, the thickness of the solid electrolyte layer 1 is d1, satisfying 0.1 μm≤d1≤100 μm; and / or the thickness of the cross-linked layer 2 is d2, satisfying 0.1 μm≤d2≤20 μm.

[0051] That is, the thickness d1 of the solid electrolyte layer 1 can be selected to be 0.1μm, 1μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm or 100μm, etc., and the thickness d2 of the cross-linked layer 2 can be selected to be 0.1μm, 0.5μm, 1μm, 5μm, 10μm, 15μm, 18μm or 20μm, etc. Of course, other values ​​can also be selected, which can be flexibly selected and adjusted according to actual needs.

[0052] It can be understood that the larger d1 is, the thicker the solid electrolyte layer 1 is, the smaller d1 is, the thinner the solid electrolyte layer 1 is, the larger d2 is, the thicker the cross-linked layer 2 is, the smaller d2 is, the thinner the cross-linked layer 2 is. In actual design, the thickness d1 of the solid electrolyte layer 1 can be selected to be 2μm≤d1≤45μm, the thickness d2 of the cross-linked layer 2 can be 1μm≤d2≤15μm, and the polymerization temperature of the cross-linked layer 2 can be selected to be in the range of 60℃-150℃, and the polymerization time is 8h-24h to achieve the best effect and reduce the internal resistance of the battery.

[0053] In some embodiments, the thickness of the first active material layer 4 is d3; wherein, when the first active material layer 4 is a positive electrode material, 30 μm ≤ d3 ≤ 250 μm is satisfied, and when the first active material layer 4 is a negative electrode material, 30 μm ≤ d3 ≤ 200 μm is satisfied.

[0054] Specifically, when the first active material layer 4 is a positive electrode material, the thickness d3 of the first active material layer 4 can be selected to be 30μm, 50μm, 100μm, 160μm, 180μm, 200μm, 220μm or 250μm, etc., so as to improve the contact effect between the first active material layer 4 of the positive electrode material and the second active material layer 3 and the current collector 5, better bonding contact, and reduce the internal resistance of the solid-state battery. In a specific design, when the thickness d3 of the first active material layer 4 of the positive electrode material is in the range of 40μm≤d3≤150μm, better effects can be achieved.

[0055] And when the first active material layer 4 is a negative electrode material, the thickness d3 of the first active material layer 4 can be selected to be 30μm, 60μm, 100μm, 110μm, 140μm, 160μm, 190μm or 200μm, etc., so as to improve the contact effect between the first active material layer 4 of the negative electrode material and the second active material layer 3 and the current collector 5, better bonding contact, and reduce the internal resistance of the solid-state battery. In a specific design, when the thickness d3 of the first active material layer 4 of the negative electrode material is in the range of 40μm≤d3≤150μm, better effects can be achieved.

[0056] Therefore, by designing the thickness of the first active material layer 4 of the positive electrode material with different characteristics and the first active material layer 4 of the negative electrode material differently, it is possible to achieve a better contact effect between the first active material layer 4 and the second active material layer 3 and the current collector 5, absorb charges, and reduce interface impedance.

[0057] The first active material layer 4 can be prepared in the following manner.

[0058] The solvent and the binder are taken and stirred to prepare the glue required for the slurry, and then the conductive agent and the main material are added to the glue to disperse to prepare the slurry, and the slurry required for the first active material layer 4 is completed, and finally the first active material layer 4 is prepared by coating.

[0059] The preparation process of the second active material layer 3 is the same as that of the first active material layer 4 . After the slurry required for the second active material layer 3 is prepared, coating is performed to prepare the second active material layer 3 .

[0060] In some embodiments, the thickness of the first active material layer 4 is d4, satisfying 1 μm≤d4≤d3 / 2+10 μm.

[0061] That is, the thickness d4 of the first active material layer 4 can be selected to be 1 μm, d3 / 2+10 μm, etc., as long as it is within the range of 1 μm≤d4≤d3 / 2+10 μm.

[0062] It can be understood that the larger d4 is, the thicker the thickness of the first active material layer 4 is, and the smaller d4 is, the thinner the thickness of the first active material layer 4 is. In specific practical design, when the thickness of the first active material layer 4 of the negative electrode material is in the range of 3μm≤d4≤d3 / 2μm, better effect can be achieved.

[0063] The utility model also provides a battery.

[0064] The battery according to the embodiment of the utility model comprises any of the above-mentioned battery pole pieces 100. Among them, by providing a solid electrolyte layer 1, a cross-linking layer 2, a second active material layer 3, a first active material layer 4 and a current collector 5 which are stacked and distributed in sequence, and setting the contact form of the contact surface between two adjacent ones as non-surface contact, the contact form and contact effect between the interfaces can be flexibly changed, thereby reducing the interface contact resistance of the solid-state battery, thereby reducing the internal resistance of the battery, improving the impedance of the solid-state battery, and improving the cycle performance, solving the problem of reduced solid-state battery performance caused by high solid-solid contact interface resistance of the solid-state battery.

[0065] The battery and the battery electrode 100 of this embodiment can be prepared by the following method.

[0066] 1. Prepare the slurry required for the first active material layer 4. Take the solvent and the binder to prepare the glue solution required for the slurry through stirring and other processes, then add the conductive agent and the main material to the glue solution for dispersion to prepare the slurry, complete the slurry required for the first active material layer, and wait for coating to prepare the first active material layer 4.

[0067] 2. Prepare the slurry required for the second active material layer 3. Take the solvent and the binder to prepare the glue required for the slurry through stirring and other processes, then add the graphene conductive agent and the main material to the glue to disperse to prepare the slurry, and then take the first active material layer 4 slurry and the second active material layer 3 slurry and transfer them to the coating machine for coating to obtain the first active material layer 4 and the second active material layer 3 coated on the current collector 5.

[0068] 3. Prepare the solid electrolyte layer 1. The selected solid electrolyte layer 1 is etched by laser roughening to form pores, and combined with the current collector 5 with the first active material layer 4 and the second active material layer 3 prepared in the second step to form the required battery electrode 100 with the solid electrolyte layer 1.

[0069] 4. Prepare the crosslinking layer 2. Add the crosslinking layer 2 to the battery pole piece 100 prepared in the third step, crosslink the crosslinking layer 2 at a temperature of 60° C. to 150° C. for 8 h to 24 h, and complete the preparation of the crosslinking layer 2 to form a multi-layered battery pole piece 100.

[0070] 5. Obtain solid-state batteries through assembly and other processes.

[0071] Among them, the battery pole piece 100 with double-layer coating can selectively select the conductive agent and coating thickness of the second active material layer 3 according to the cross-linking layer 2 and the target requirements of the battery cell, so as to better design and select the battery cell and improve the electrochemical performance of the battery cell.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pole piece, characterized in that: It includes a solid electrolyte layer, a cross-linking layer, a second active material layer, a first active material layer and a current collector which are stacked and distributed in sequence; Among them, the solid electrolyte layer, the cross-linked layer, the second active material layer, and the first active material layer are in point-line contact, line-line contact, and / or line-surface contact with each other, and the first active material layer is in point-surface contact and / or line-surface contact with the current collector.

2. The battery electrode according to claim 1, characterized in that: The cross-linked layer is constructed in a three-dimensional network shape and includes a plurality of cross-distributed linear structures, and the linear structures are in pressure contact with the solid electrolyte layer and the second active material layer.

3. The battery pole piece according to claim 1, characterized in that: The solid electrolyte layer has pores formed at least on one side facing the cross-linked layer, and at least a portion of the cross-linked layer extends into the pores to contact the solid electrolyte layer.

4. The battery pole piece according to claim 3, characterized in that: The pores have a pore diameter of R and a pore depth of D, which satisfy: 0.5 μm≤R≤500 μm, 0.5 μm≤D≤100 μm.

5. The battery pole piece according to claim 1, characterized in that: The solid electrolyte layer includes at least one of an oxide solid electrolyte and a sulfide solid electrolyte.

6. The battery pole piece according to claim 5, characterized in that: The oxide solid electrolyte is Li 1.5 A l0.5 Ti 1.5 (PO4)3、Li 0.5 La 0.5 TiO3、Li 1.4 A l0.4 Ti 1.6 (PO4)3 or Li 7-3x-y Al x La3Zr2-yNbyO 12 , and satisfy: 0≤x≤0.3, 0≤y≤0.5; And / or, the oxide solid electrolyte is Li4-xGe1-xP x S4 or Li3+5zP1-zS 12 , and satisfies: 0<x<1, 0<z<0.

27.

7. The battery pole piece according to claim 1, characterized in that: The thickness of the solid electrolyte layer is d1, which satisfies 0.1 μm≤d1≤100 μm; And / or, the thickness of the cross-linked layer is d2, and satisfies 0.1 μm≤d2≤20 μm.

8. The battery pole piece according to claim 1, characterized in that: The thickness of the first active material layer is d3; When the first active material layer is a positive electrode material, 30 μm ≤ d3 ≤ 250 μm is satisfied, and when the first active material layer is a negative electrode material, 30 μm ≤ d3 ≤ 200 μm is satisfied.

9. The battery pole piece according to claim 8, characterized in that: The thickness of the second active material layer is d4, which satisfies 1 μm≤d4≤d3 / 2+10 μm.

10. A battery, characterized in that: A battery pole piece comprising any one of claims 1-9.

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