Array base film, battery current collector, battery pole piece, battery and preparation method thereof

Abstract

The present application provides an array base film, a battery current collector, a battery electrode, a battery, and a method for manufacturing the same, all belonging to the field of flexible electronic components. The array base film comprises a plurality of first regions arranged in an array and second regions arranged alternately with the first regions. The first regions comprise an organic polymer layer, and the second regions comprise an organic polymer layer and a conductive metal located on the surface and within the organic polymer layer. The array base film can, to a certain extent, resolve the problems of difficult and poor welding between the flexible conductive film and the tab, thereby effectively reducing the resistance between the tab and the electrode.

Description

Technical Field

[0001] The present application relates to the field of flexible electronic components, and more specifically, to an array base film, a battery current collector, a battery pole piece, a battery, and a method for preparing the same. Background Art

[0002] In the existing technology, metal foil is often used as a battery current collector. However, these metal foils have no energy storage activity but occupy 15-30% of the battery's mass, which affects the battery's energy density. In addition, the battery current collector needs to have a certain mechanical strength, which makes it impossible to effectively reduce the mass proportion of the metal foil in the battery by reducing the thickness of the metal foil.

[0003] Based on this, technicians have developed a flexible conductive film to replace the traditional metal foil battery current collector. Although the flexible conductive film can effectively reduce the mass proportion of the battery current collector in the battery and play a role in improving the energy density of the battery, the existing flexible conductive film and the tab have problems such as welding difficulties and poor welding during the welding process, resulting in excessively high resistance between the tab and the electrode. Summary of the Invention

[0004] The applicant's research found that the existing flexible conductive film directly sets a conductive layer on both sides of the organic polymer layer and welds it to the tab through the conductive layer. This setting has problems such as difficult welding and poor welding due to the thin conductive layer and low melting point of the organic polymer layer.

[0005] The purpose of this application is to provide an array base film, a battery current collector, a battery electrode, a battery and a preparation method thereof, which can solve the problems of difficulty in welding the flexible conductive film and the electrode tab and poor welding to a certain extent, thereby effectively reducing the resistance between the electrode tab and the electrode tab.

[0006] The embodiment of the present application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides an array base film, comprising a plurality of first regions distributed in an array and second regions alternately distributed with the first regions, wherein the first region comprises an organic polymer layer, and the second region comprises an organic polymer layer and a conductive metal located on the surface and inside of the organic polymer layer.

[0008] In the above technical solution, the second region is set to be in the form of an organic polymer layer combined with a conductive metal, so that the second region has the function of through-conductivity, so that it can be directly welded to the pole ear through the conductive metal of the second region itself to achieve circuit connectivity. Compared with the existing flexible conductive film, the array base film provided by the present application has the advantages of simple welding process and relatively strong welding during welding, thereby effectively reducing the resistance between the pole ear and the pole piece.

[0009] In some optional embodiments, the array distribution is in the form of a linear array; or the array distribution is in the form of a rectangular array.

[0010] In the above technical solution, the array distribution is arranged in the above form, which can make the overall structure of the array base film more regular and also facilitate the process preparation.

[0011] In some optional embodiments, the thickness of the array base film is 500 to 20,000 nm.

[0012] In the above technical solution, the thickness of the array base film is limited to the above range because: if the thickness is too small (welding has certain requirements on thickness), it is not convenient to weld the second area and the tab; if the thickness is too large, the mass proportion of the array base film in the battery is too large (the mass proportion is equivalent to that of traditional metal foil), and it cannot effectively improve the energy density of the battery.

[0013] In some optional embodiments, the conductive metal includes one or more of Ni, Zn, Cu, Co, Mn, Ti, Ga, Ge, Sn, Sb, Zr, Mo, Al, Cr, Ag, and alloys of corresponding elements.

[0014] In the above technical solution, there are a variety of conductive metals, and suitable types of conductive metals can be selected according to different battery systems, thereby better ensuring the electrical performance of the battery.

[0015] In a second aspect, embodiments of the present application provide a battery current collector comprising a metal conductive layer and an array base film as provided in the embodiment of the first aspect. In the thickness direction of the array base film, the metal conductive layer is located on one or both sides of the array base film;

[0016] Alternatively, the array base film includes a metal bonding layer and the array base film provided in the embodiment of the first aspect. In the thickness direction of the array base film, the metal bonding layer is located on one side or both sides of the first region.

[0017] In the above technical solution, the battery current collector includes the array base membrane provided in the first embodiment, which can be directly welded to the tab through the second area of ​​the array base membrane. Compared with the conventional metal foil current collector, it can effectively reduce the mass proportion of the battery current collector in the battery, thereby improving the energy density of the battery. At the same time, there are many types of conductive metal structures in the battery current collector, which can provide more feasible implementation methods, thereby facilitating promotion and application.

[0018] In some optional embodiments, the thickness of the metal conductive layer is 200 to 5000 nm.

[0019] In the above technical solution, limiting the thickness of the metal conductive layer to the above range can ensure that the metal conductive layer has an appropriate thickness, thereby ensuring that it has good conductivity.

[0020] In some optional embodiments, the metal conductive layer is provided corresponding to both the first region and the second region.

[0021] In the above technical solution, the metal conductive layer is arranged in the above form. Compared with only arranging the metal conductive layer corresponding to the first region, the thickness of the conductive metal in the second region can be appropriately increased, thereby facilitating welding with the tab.

[0022] In a third aspect, embodiments of the present application provide a battery current collector comprising a non-metallic conductive layer and an array base film as provided in the first aspect. In the thickness direction of the array base film, the non-metallic conductive layer is located on one or both sides of the first region.

[0023] In a fourth aspect, an embodiment of the present application provides a battery electrode, comprising a battery current collector as provided in the embodiment of the second or third aspect and an active coating located on the surface of the battery current collector.

[0024] In a fifth aspect, an embodiment of the present application provides a battery, comprising a battery electrode provided in the embodiment of the fourth aspect.

[0025] In a sixth aspect, an embodiment of the present application provides a method for preparing an array base film, comprising the following steps:

[0026] A plurality of first regions distributed in an array and second regions distributed alternately with the first regions are formed. The first regions include an organic polymer layer, and the second regions include the organic polymer layer and a conductive metal located on the surface and inside of the organic polymer layer.

[0027] In the above technical solution, by preparing according to the above process, an array base membrane can be prepared which has excellent properties such as simple welding process and relatively strong welding when welded to the tab.

[0028] In some optional embodiments, the preparation of the array basement membrane comprises the following steps:

[0029] Mixing a polymer raw material for preparing an array base film and a solvent to obtain a first precursor solution;

[0030] adding inorganic particles to a portion of the first precursor solution and mixing the mixture to obtain a second precursor solution;

[0031] Alternating between a first precursor liquid and a second precursor liquid to prepare a polymer layer; wherein the first precursor liquid corresponds to the first region and the second precursor liquid corresponds to the second region;

[0032] immersing the polymer layer in a pore-forming liquid to dissolve the inorganic particles in the second region and form pores;

[0033] The raw materials for preparing the conductive metal are applied into the holes, and the conductive metal is formed by chemical plating deposition technology.

[0034] In some optional embodiments, the sheet resistance of the second region is 50-10000 mΩ / □.

[0035] In the above technical solution, the square resistance of the corresponding second region under the preparation process is limited to the above range, so that after the electrode sheet and the electrode tab are welded, there is a suitable resistance value between the two.

[0036] In some optional embodiments, the particle size of the inorganic particles is 100 to 2000 nm.

[0037] In the above technical solution, the particle size of the inorganic particles is limited to the above range because: on the one hand, if the particle size is too small, the holes formed are also small, which makes it inconvenient for the conductive metal to enter the holes for filling; on the other hand, if the holes are too large, the holes formed are also too large, and gaps are likely to appear when the conductive metal is filled, resulting in a decrease in conductive performance. At the same time, holes that are too large can easily cause the film material to break during the stretching process.

[0038] In some optional embodiments, the inorganic particles include one or more of inorganic salt particles, transition metal oxide particles, transition metal sulfide particles, metal elements, and alloys thereof.

[0039] In the above technical solution, the variety of inorganic particles is rich, so that there are more feasible implementation plans in the pore-forming stage, thereby facilitating the formation of conductive metal in the second region.

[0040] In some optional embodiments, the preparation of the array basement membrane comprises the following steps:

[0041] Mixing a polymer raw material for preparing an array base film and a solvent to obtain a first precursor solution;

[0042] A polymer layer is prepared using a first precursor liquid;

[0043] Conductive metal is applied to the surface and interior of the polymer layer at intervals using intermittent ion implantation technology to form conductive metal; wherein, in the polymer layer, the area without conductive metal applied is the first area, and the area with conductive metal applied is the second area.

[0044] In some optional embodiments, the sheet resistance of the second region is 10-5000 mΩ / □.

[0045] In the above technical solution, the square resistance of the corresponding second region under the preparation process is limited to the above range, so that after the electrode sheet and the electrode tab are welded, there is a suitable resistance value between the two.

[0046] In some optional embodiments, during the intermittent ion implantation process of applying the conductive metal spacer to the surface and the interior of the polymer layer, the energy of the ion implantation is 30 to 80 keV, and / or the dose of the ion implantation is 0.5 to 5×10 17 ions / cm 2 .

[0047] In the above technical solution, the energy of ion injection is limited to the above range, so that the injection energy is in an appropriate range, so that it can better penetrate the organic polymer layer to achieve the purpose of applying conductive metal; the dose of ion injection is limited to the above range, so that the dose of ion injection is in an appropriate range, thereby ensuring that the content of conductive metal in the second region has an appropriate mass ratio to ensure the conductive performance of the second region.

[0048] In a seventh aspect, an embodiment of the present application provides a method for preparing a battery current collector, comprising the following steps:

[0049] Providing an array base film as provided in the embodiment of the first aspect; and

[0050] In the thickness direction of the array base film, a metal conductive layer is formed on one side or both sides of the array base film, or a non-metal conductive layer is formed on one side or both sides of the first region;

[0051] Alternatively, a metal bonding layer is formed on one side or both sides of the first region in the thickness direction of the array base film;

[0052] Alternatively, a non-metallic conductive layer is formed on one side or both sides of the first region in the thickness direction of the array base film.

[0053] In the above technical solution, by preparing according to the above process, a battery current collector can be prepared that has excellent properties such as simple welding process and relatively strong welding when welded to the tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0055] Figure 1A schematic diagram of the structure of an array base film provided in an embodiment of the present application from a front view perspective;

[0056] Figure 2 A schematic diagram of the structure of an array base film provided in an embodiment of the present application from a top view perspective;

[0057] Figure 3 A schematic diagram of the structure of another array base film provided in an embodiment of the present application in a front view;

[0058] Figure 4 A schematic diagram of the structure of another array base film provided in an embodiment of the present application from a front view perspective;

[0059] Figure 5 A schematic diagram of the structure of a battery current collector provided in an embodiment of the present application from a front view perspective;

[0060] Figure 6 A schematic diagram of the structure of another battery current collector provided in an embodiment of the present application from a front view perspective;

[0061] Figure 7 A schematic diagram of the structure of a battery electrode provided in an embodiment of the present application from a front view perspective;

[0062] Figure 8 A schematic structural diagram of another battery electrode provided in an embodiment of the present application from a front view perspective.

[0063] Icon: 10-array base film; 100-first region; 200-second region; 20-metal conductive layer; 30-non-metal conductive layer; 1-battery current collector; 2-battery pole piece; 40-active coating. DETAILED DESCRIPTION

[0064] To make the purpose, technical solutions and advantages of the examples of the present application clearer, the technical solutions in the examples of the present application will be described clearly and completely below. Where specific conditions are not specified in the examples, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially.

[0065] It should be noted that “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to three situations: “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”.

[0066] In addition, in the description of this application, unless otherwise specified, the meaning of "multiple" in "one or more" refers to two or more; the range of "value a to value b" includes the two end values ​​"a" and "b", and the "unit of measurement" in "value a to value b+unit of measurement" represents the "unit of measurement" of both "value a" and "value b".

[0067] The following is a detailed description of an array base film, a battery current collector, a battery electrode, a battery and a preparation method thereof in accordance with an embodiment of the present application.

[0068] See Figure 1 In the first aspect, an embodiment of the present application provides an array base film 10, comprising a plurality of first regions 100 distributed in an array and second regions 200 alternately distributed with the first regions 100, wherein the first regions 100 include an organic polymer layer, and the second regions 200 include an organic polymer layer and a conductive metal located on the surface and inside of the organic polymer layer.

[0069] In the present application, the second region 200 is set in the form of an organic polymer layer combined with a conductive metal, so that the second region 200 has the function of through-conductivity, so that the conductive metal of the second region 200 itself can be directly welded to the pole ear to achieve circuit connectivity. Compared with the existing flexible conductive film, the array base film 10 provided in the present application has the advantages of simple welding process and relatively firm welding during welding, thereby effectively reducing the resistance between the pole ear and the pole piece.

[0070] It should be noted that, compared with the flexible conductive film in which the welding area is only provided with conductive metal but no organic polymer layer (i.e., a hollow structure without a support portion for supporting the conductive metal), the second area 200 of the array base film 10 provided in the present application also has an organic polymer layer, so that when welding with the tab, the welding part can be effectively supported, thereby ensuring that the array base film 10 has a higher tensile strength; in addition, compared with the flexible conductive film in which the welding area is set as a through hole and filled with a conductive metal layer (the opening will reduce the mechanical strength of the film material, and the corresponding process is more difficult and demanding), the array base film 10 provided in the present application also has the advantage of being able to ensure that the mechanical properties and processability of the film material are improved.

[0071] It should be noted that the distribution of the array in the array base film 10 is not limited and can be adjusted according to actual needs.

[0072] See Figures 2 to 4 As an example, the array distribution is in the form of a linear array; or the array distribution is in the form of a rectangular array.

[0073] In this embodiment, the array distribution is arranged in the above-mentioned form, which can make the overall structure of the array base film 10 more regular and also facilitate the process preparation.

[0074] It should be noted that Figure 2 The array base film 10 is obtained by stretching the film material along the length direction (ie longitudinal direction). Figure 3 The array base film 10 is obtained by stretching the film material along the width direction (ie, the transverse direction). Figure 4 It shows the array base film 10 obtained by stretching the film material in both the length direction (ie longitudinal direction) and the width direction (ie transverse direction).

[0075] It should be noted that, considering the array base film 10's carrying capacity for energy storage active materials and the convenience during welding, the size of the first area 100 can be set to be larger than the size of the second area 200. It can be understood that the specific sizes of the first area 100 and the second area 200 are not limited and can be adjusted accordingly according to the specifications of the tabs.

[0076] As an example, when the array distribution is in the form of a linear array and the film material is stretched in the longitudinal direction, the size of the first area 100 in the longitudinal direction is 5 to 500 cm, for example but not limited to any point value of 5 cm, 10 cm, 20 cm, 50 cm, 100 cm, 200 cm, 300 cm, 400 cm and 500 cm, or a range value between any two of them; the size of the second area 200 in the longitudinal direction is 1 to 20 cm, for example but not limited to any point value of 1 cm, 1 cm, 3 cm, 4 cm, 5 cm, 10 cm, 15 cm, and 20 cm, or a range value between any two of them.

[0077] In other possible implementations, when the array distribution is in the form of a linear array and the film material is stretched in the transverse direction, the size of the second region 200 in the transverse direction is 1 / 100 to 1 / 5 of the array base film 10 .

[0078] It should be noted that the thickness of the array base film 10 is not limited and can be adjusted according to actual needs.

[0079] As an example, the thickness of the array base film 10 is 500 to 20,000 nm, such as but not limited to any one of 500 nm, 1,000 nm, 5,000 nm, 10,000 nm, 15,000 nm and 20,000 nm or a range between any two of the values.

[0080] In this embodiment, the thickness of the array base film 10 is limited to the above range because: if the thickness is too small (welding has certain requirements on thickness), it is not convenient to weld the second area 200 to the tab; if the thickness is too large, the mass proportion of the array base film 10 in the battery is too large (the mass proportion is equivalent to that of traditional metal foil), and it cannot effectively improve the energy density of the battery.

[0081] It should be noted that the type of conductive metal is not limited and can be adjusted according to actual needs.

[0082] As an example, the conductive metal includes one or more of Ni, Zn, Cu, Co, Mn, Ti, Ga, Ge, Sn, Sb, Zr, Mo, Al, Cr, Ag, and alloys of the corresponding elements.

[0083] In this embodiment, there are a variety of conductive metals, and suitable types of conductive metals can be selected according to different battery systems, thereby better ensuring the electrical performance of the battery.

[0084] See Figure 5 In a second aspect, an embodiment of the present application provides a battery current collector 1, comprising a metal conductive layer 20 and an array base film 10 as provided in the embodiment of the first aspect. In the thickness direction of the array base film 10, the metal conductive layer 20 is located on one side or both sides of the array base film 10;

[0085] Alternatively, the array base film 10 includes a metal bonding layer (not shown) and the array base film 10 provided in the embodiment of the first aspect. In the thickness direction of the array base film 10 , the metal bonding layer is located on one side or both sides of the first region 100 .

[0086] In the present application, the battery current collector 1 includes the array base membrane 10 provided in the first embodiment, which can be directly welded to the tab through the second area 200 of the array base membrane 10. Compared with the conventional metal foil current collector, it can effectively reduce the mass proportion of the battery current collector 1 in the battery, thereby improving the energy density of the battery; at the same time, the battery current collector 1 has a variety of conductive metal structures, which can provide more feasible implementation methods, thereby facilitating promotion and application.

[0087] It should be noted that the thickness of the metal conductive layer 20 is not limited and can be adjusted according to actual needs.

[0088] As an example, the thickness of the metal conductive layer 20 is 200-5000 nm, for example but not limited to any one of 200 nm, 500 nm, 1000 nm, 2000 nm, 3000 nm, 4000 nm and 5000 nm, or a range between any two of the thicknesses.

[0089] In this embodiment, limiting the thickness of the metal conductive layer 20 to the above range can ensure that the metal conductive layer 20 has an appropriate thickness, thereby ensuring that it has good conductivity.

[0090] It should be noted that the material of the conductive metal layer is not limited and can be adjusted according to actual needs.

[0091] As an example, the material of the metal conductive layer 20 includes, but is not limited to, common metal Al, transition metals, and their corresponding alloys (e.g., cobalt, nickel, copper, titanium, zinc, manganese, chromium, and silver). It should be noted that since the metal conductive layer 20 can also be welded to the tab, the metal conductive layer 20 can be provided only in correspondence with the first region 100 or in correspondence with both the first region 100 and the second region 200.

[0092] As an example, the metal conductive layer 20 is provided corresponding to both the first region 100 and the second region 200 .

[0093] In this embodiment, the metal conductive layer 20 is arranged in the above-mentioned form. Compared with only arranging the metal conductive layer 20 corresponding to the first region 100, the thickness of the conductive metal in the second region 200 can be appropriately increased, thereby facilitating welding with the tab.

[0094] It should be noted that the metal adhesive layer and the metal conductive layer are made of the same metal material.

[0095] It should be noted that the thickness of the metal bonding layer is not limited and can be adjusted according to actual needs.

[0096] As an example, the thickness of the metal adhesive layer is 500-5000 nm.

[0097] See Figure 6 In a third aspect, embodiments of the present application provide a battery current collector 1 comprising a non-metallic conductive layer 30 and an array base film 10 as provided in the first aspect. In the thickness direction of the array base film 10, the non-metallic conductive layer 30 is located on one or both sides of the first region 100.

[0098] It should be noted that, since both surfaces to be welded need to be made of metal materials, when the conductive layer is made of non-metal, the conductive layer can only be provided corresponding to the first region 100 .

[0099] It should be noted that the material of the non-metallic conductive layer 30 is not specifically limited and can be adjusted according to actual needs.

[0100] As an example, the non-metallic conductive layer 30 includes one or more of conductive carbon black, carbon nanotubes, and graphene.

[0101] See Figure 7 and Figure 8 In a fourth aspect, an embodiment of the present application provides a battery electrode 2, comprising a battery current collector 1 as provided in the second or third aspect and an active coating 40 located on the surface of the battery current collector 1.

[0102] It should be noted that the type of the active coating 40 is not specifically limited and can be selected and set according to conventional selections in the art.

[0103] In a fifth aspect, an embodiment of the present application provides a battery, comprising a battery electrode provided in the embodiment of the third aspect.

[0104] In a sixth aspect, an embodiment of the present application provides a method for preparing an array base film, comprising the following steps:

[0105] A plurality of first regions distributed in an array and second regions distributed alternately with the first regions are formed. The first regions include an organic polymer layer, and the second regions include the organic polymer layer and a conductive metal located on the surface and inside of the organic polymer layer.

[0106] In the present application, by preparing according to the above process, an array base membrane can be prepared which has excellent properties such as simple welding process and relatively strong welding when welded to the tab.

[0107] It should be noted that, during the preparation of the array base film, the stretching direction of the film material is not limited, that is, it can be stretched longitudinally, transversely, or both longitudinally and transversely.

[0108] As an example, the preparation of the array basement membrane includes the following steps:

[0109] Mixing a polymer raw material for preparing an array base film and a solvent to obtain a first precursor solution;

[0110] adding inorganic particles to a portion of the first precursor solution and mixing the mixture to obtain a second precursor solution;

[0111] Alternating between a first precursor liquid and a second precursor liquid to prepare a polymer layer; wherein the first precursor liquid corresponds to the first region and the second precursor liquid corresponds to the second region;

[0112] immersing the polymer layer in a pore-forming liquid to dissolve the inorganic particles in the second region and form pores;

[0113] The raw materials for preparing the conductive metal are applied into the holes, and the conductive metal is formed by chemical plating deposition technology.

[0114] It should be noted that the specific processes and steps involved in the chemical plating deposition process are not specifically limited and can be performed according to conventional operations in the art.

[0115] It should be noted that the type of polymer raw material is not limited.

[0116] As an example, the polymer raw material includes one or more of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate, and polycarbonate.

[0117] It should be noted that the sheet resistance of the second region is not limited.

[0118] As an example, the square resistance of the second region is 50-10000 mΩ / □, for example, but not limited to, the square resistance is any one of 50 mΩ / □, 100 mΩ / □, 500 mΩ / □, 1000 mΩ / □, 5000 mΩ / □ and 10000 mΩ / □, or a range between any two of them.

[0119] In this embodiment, the square resistance of the corresponding second region under the preparation process is limited to the above range, so that after the electrode sheet and the electrode tab are welded, there is a suitable resistance value between the two.

[0120] It should be noted that the particle size of the inorganic particles is not limited and can be limited according to actual needs.

[0121] As an example, the particle size of the inorganic particles is 100-2000 nm, for example but not limited to any one of 100 nm, 500 nm, 1000 nm, 1500 nm and 2000 nm, or a range between any two of the particle sizes.

[0122] In this embodiment, the particle size of the inorganic particles is limited to the above range because: on the one hand, if the particle size is too small, the holes formed are also small, which makes it inconvenient for the conductive metal to enter the holes for filling; on the other hand, if the holes are too large, the holes formed are also too large, and gaps are likely to appear when the conductive metal is filled, resulting in a decrease in conductive performance. At the same time, holes that are too large can easily cause the film material to break during the stretching process.

[0123] It should be noted that the types of inorganic particles are not limited.

[0124] As an example, the inorganic particles include one or more of inorganic salt particles, transition metal oxide particles, transition metal sulfide particles, metal elements and alloys thereof.

[0125] In this embodiment, the variety of inorganic particles is rich, so that there are more feasible implementation options in the pore-forming stage, thereby facilitating the formation of conductive metal in the second region.

[0126] It should be noted that the types of inorganic salt particles are not limited.

[0127] As an example, the inorganic salt particles include one or more of NaCl, KCl, FeCl2, FeCl3, NH4Cl, Na2CO3, K2CO3, Na2SO4 and K2SO4.

[0128] It should be noted that the type of transition metal oxide particles is not limited.

[0129] As an example, the transition metal oxide particles include one or more of ZnO, Fe2O3, Fe3O4, Cu2O, CuO, NiO, and Co3O4.

[0130] It should be noted that the type of transition metal sulfide particles is not limited.

[0131] As an example, the transition metal sulfide particles include one or more of ZnS, FeS, CuS, and CoS.

[0132] It should be noted that the type of metal element is not limited.

[0133] As an example, the metal element includes one or more of Cu, Fe, Al, Ni, Co, Mn, and Zn.

[0134] As an example, the preparation of the array basement membrane includes the following steps:

[0135] Mixing a polymer raw material for preparing an array base film and a solvent to obtain a first precursor solution;

[0136] A polymer layer is prepared using a first precursor liquid;

[0137] Conductive metal is applied to the interior of the polymer layer at intervals using intermittent ion implantation technology to form conductive metal; wherein, in the polymer layer, the area without conductive metal applied is the first area, and the area with conductive metal applied is the second area.

[0138] It should be noted that the sheet resistance of the second region is not limited.

[0139] As an example, the square resistance of the second region is 10-5000mΩ / □, for example but not limited to, the square resistance is any one of 10mΩ / □, 100mΩ / □, 500mΩ / □, 1000mΩ / □ and 5000mΩ / □ or a range between any two of them.

[0140] In this embodiment, the square resistance of the corresponding second region under the preparation process is limited to the above range, so that after the electrode sheet and the electrode tab are welded, there is a suitable resistance value between the two.

[0141] It should be noted that during the ion implantation process, the energy and dose of the ion implantation are not limited and can be adjusted according to actual needs.

[0142] As an example, in the process of applying the conductive metal spacer to the surface and the interior of the polymer layer by using the intermittent ion implantation technology, the energy of the ion implantation is 30 to 80 keV, for example, but not limited to, any one of 30 keV, 40 keV, 50 keV, 60 keV, 70 keV and 80 keV or a range between any two thereof; and / or the dose of the ion implantation is 0.5 to 5×10 17 ions / cm 2 , for example but not limited to a dose of 0.5×10 17 ions / cm 2 , 1×10 17 ions / cm 2 , 2×10 17 ions / cm 2 , 3×10 17 ions / cm 2 , 4×10 17 ions / cm 2 and 5×10 17 ions / cm 2 Any point value in or any range of values ​​between .

[0143] In this embodiment, the energy of ion injection is limited to the above range, so that the injection energy is in an appropriate range, so that it can better penetrate the organic polymer layer to achieve the purpose of applying conductive metal; the dose of ion injection is limited to the above range, so that the dose of ion injection is in an appropriate range, thereby ensuring that the content of conductive metal in the second region has an appropriate mass ratio to ensure the conductive performance of the second region.

[0144] It should be noted that, during the ion implantation process, steps and processes not specifically defined or described are not limited and can be performed according to conventional operations in the art.

[0145] In a seventh aspect, an embodiment of the present application provides a method for preparing a battery current collector, comprising the following steps:

[0146] Providing an array base film as provided in the embodiment of the first aspect; and

[0147] forming a metal conductive layer on one side or both sides of the array base film in the thickness direction of the array base film;

[0148] Alternatively, a metal bonding layer is formed on one side or both sides of the first region in the thickness direction of the array base film;

[0149] Alternatively, a non-metallic conductive layer is formed on one side or both sides of the first region in the thickness direction of the array base film.

[0150] In the present application, by preparing according to the above process, a battery current collector can be prepared that has excellent properties such as simple welding process and relatively strong welding when welded to the tab.

[0151] It should be noted that the preparation method of the metal conductive layer is not limited and can be adjusted according to actual conditions.

[0152] As an example, when the conductive layer is a metal conductive layer, it can be prepared using a metal deposition technology.

[0153] It should be noted that the type of metal deposition technology is not limited and can be one or more of chemical vapor deposition, atomic layer deposition, physical vapor deposition, electroless plating and electroplating.

[0154] It should be noted that the bonding process of the metal bonding layer is not limited and can be performed according to conventional operations in the art.

[0155] It should be noted that the preparation method of the non-metallic conductive layer is not limited and can be adjusted according to actual conditions.

[0156] When the conductive layer is a non-metallic conductive layer, one or more of coating and screen printing may be used.

[0157] It should be noted that in order to better use the prepared battery current collector for battery assembly to obtain a battery product with better electrical performance, the parameters of the battery current collector prepared by this method can be limited.

[0158] As an example, taking the conductive layer as a metal conductive layer, the square resistance of the battery current collector is 10-10000 mΩ / □, the tensile strength is 200-600 MPa, and the peel strength is 300-800 N / m.

[0159] As an example, taking the conductive layer as a metal adhesive layer, the square resistance of the battery current collector is 2-5000 mΩ / □ and the tensile strength is 200-500 MPa.

[0160] It should be noted that since the prepared battery current collector is distributed in an array, that is, there are multiple first areas and multiple second areas at the same time, considering the welding coordination with the pole ear, it can be decided whether the battery current collector needs to be sheared according to actual needs (for example: if the pole piece is welded to a single pole ear, the battery current collector needs to be sheared; if the pole piece is welded to multiple pole ears, the battery current collector does not need to be sheared).

[0161] It should be noted that since the battery current collector is an upstream product of the battery pole piece, and the array base membrane is also an upstream product of the battery current collector (that is, the preparation method of the battery pole piece also includes the preparation method of the battery current collector and the array base membrane), this application only needs to explain the preparation method of the battery pole piece.

[0162] The features and performance of the present application are further described in detail below with reference to the embodiments.

[0163] Example 1

[0164] The present invention provides a method for preparing a battery electrode, comprising the following steps:

[0165] Preparation of S1 array basement membrane

[0166] Polypropylene, polyethylene, polystyrene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate or polycarbonate is dissolved in a mixed solvent of white oil and dichloromethane, and after being fully dispersed and dissolved, it is divided into two parts, and 500nm Cu2O and Cu particles are added to one part and mixed evenly to serve as the second precursor solution, and the untreated part is used as the first precursor solution.

[0167] An organic polymer layer is prepared by alternating the first precursor liquid and the second precursor liquid according to a wet film forming process, wherein the organic polymer layer is prepared by longitudinal stretching, the longitudinal dimensions of the first region and the second region are 20 cm and 1 cm respectively, and the thickness of the organic polymer layer (i.e., the array base film) is 5000 nm.

[0168] The organic polymer layer was immersed in 0.05M dilute hydrochloric acid for 10 minutes and then rinsed with deionized water. Then, a Ni-Cu conductive metal was deposited in the second region using an electroless plating system using SnCl2-PdCl2 as a sensitizer and activator, NiSO4 and CuSO4 as the main salts, and NaH2PO2 as a reducing agent to prepare an array base film; wherein the square resistance of the second region was 1000mΩ / □.

[0169] Preparation of S2 battery current collector

[0170] The array base film prepared by S1 was used as a substrate, and then an Al conductive layer was formed on both sides of the array base film by physical vapor deposition technology to prepare a battery current collector; wherein the thickness of the Al conductive layer was 1000 nm.

[0171] Preparation of S3 battery pole pieces

[0172] The battery current collector substrate prepared in S2 is used as a substrate, and then an active coating is formed on the areas corresponding to the first area on both sides of the battery current collector by intermittent coating technology to prepare a battery pole piece.

[0173] Example 2

[0174] An embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that: the particle size of the Cu2O and Cu particles is 100 nm, the thickness of the array base film is 500 nm, an Al conductive layer is formed on both sides of the array base film by chemical vapor deposition technology, the thickness of the Al conductive layer is 200 nm, and the square resistance of the second region is 10000 mΩ / □.

[0175] Example 3

[0176] The embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that: the particle size of the Cu2O and Cu particles is 2000nm, the thickness of the array base film is 20000nm, an Al conductive layer is formed on both sides of the array base film by chemical plating deposition technology, the thickness of the Al conductive layer is 5000nm, and the square resistance of the second region is 50mΩ / □.

[0177] Example 4

[0178] This embodiment of the present application provides a method for preparing a battery electrode sheet, which differs from Example 1 in that the longitudinal dimension of the second region is 2 cm.

[0179] Example 5

[0180] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that the longitudinal dimension of the second region is 3 cm.

[0181] Example 6

[0182] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that the longitudinal dimension of the second region is 5 cm.

[0183] Example 7

[0184] The embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0185] Example 8

[0186] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 4 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0187] Example 9

[0188] The embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 5 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0189] Example 10

[0190] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 6 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0191] Example 11

[0192] The embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that the particle size of Cu2O and Cu particles is 50 nm.

[0193] Example 12

[0194] The embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that the particle size of Cu2O and Cu particles is 2500 nm.

[0195] Example 13

[0196] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that the thickness of the array base film is 400 nm.

[0197] Example 14

[0198] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 1 in that the thickness of the array base film is 20500 nm.

[0199] Example 15

[0200] The present invention provides a method for preparing a battery electrode, comprising the following steps:

[0201] Preparation of S1 array basement membrane

[0202] Polypropylene, polyethylene, polystyrene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate or polycarbonate is dissolved in a mixed solvent of white oil and dichloromethane, and the mixture is fully dispersed and dissolved to obtain a first precursor solution.

[0203] The organic polymer layer was prepared by wet film forming process using the first precursor solution, wherein the organic polymer layer was prepared by longitudinal stretching, and the thickness of the organic polymer layer (ie, the array base film) was 5000 nm.

[0204] Zn metal ions are applied to the surface and interior of the organic polymer layer by intermittent ion implantation technology to form Zn conductive metal, thereby preparing an array base film; wherein, in the array base film, the area without Zn conductive metal applied is the first area, the area with Zn conductive metal applied is the second area, the sheet resistance of the second area is 1000 mΩ / □, the ion implantation energy is 50 keV, and the ion implantation dose is 2×10 17 ions / cm 2 .

[0205] Preparation of S2 battery current collector

[0206] The array base film prepared by S1 was used as a substrate, and then an Al conductive layer was formed on both sides of the array base film by physical vapor deposition technology to prepare a battery current collector; wherein the thickness of the Al conductive layer was 1000 nm.

[0207] Preparation of S3 battery pole pieces

[0208] The battery current collector substrate prepared in S2 is used as a substrate, and then an active coating is formed on the areas corresponding to the first area on both sides of the battery current collector by intermittent coating technology to prepare a battery pole piece.

[0209] Example 16

[0210] The present embodiment provides a method for preparing a battery electrode. The difference between the present embodiment and embodiment 15 is that intermittent ion implantation technology is used to apply Ni metal ions to the surface and interior of the organic polymer layer to form Ni conductive metal, the sheet resistance of the second region is 5000 mΩ / □, the energy of ion implantation is 30 keV, and the dose of ion implantation is 0.5×10 17 ions / cm 2 .

[0211] Example 17

[0212] The present embodiment provides a method for preparing a battery electrode. The difference between the present embodiment and embodiment 15 is that intermittent ion implantation technology is used to apply Cu metal ions to the surface and interior of the organic polymer layer to form Cu conductive metal, the sheet resistance of the second region is 10 mΩ / □, the energy of the ion implantation is 80 keV, and the dose of the ion implantation is 5×10 17 ions / cm 2 .

[0213] Example 18

[0214] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 15 in that the longitudinal dimension of the second region is 2 cm.

[0215] Example 19

[0216] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 15 in that the longitudinal dimension of the second region is 3 cm.

[0217] Example 20

[0218] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 15 in that the longitudinal dimension of the second region is 5 cm.

[0219] Example 21

[0220] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 15 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0221] Example 22

[0222] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 18 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0223] Example 23

[0224] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 19 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0225] Example 24

[0226] This embodiment of the present application provides a method for preparing a battery electrode, which differs from Example 20 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0227] Comparative Example 1

[0228] The comparative example of the present application provides a method for preparing a battery electrode, comprising the following steps:

[0229] Preparation of S1 array basement membrane

[0230] Polypropylene, polyethylene, polystyrene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, silicone rubber, acrylonitrile-butadiene-styrene copolymer, polybutylene terephthalate or polycarbonate is dissolved in a mixed solvent of white oil and dichloromethane, and the mixture is fully dispersed and dissolved to obtain a first precursor solution.

[0231] An organic polymer layer is prepared using the first precursor liquid according to a wet film forming process, wherein the organic polymer layer is prepared by longitudinal stretching and the thickness of the organic polymer layer (ie, the array base film) is 5000 nm to prepare the array base film.

[0232] Preparation of S2 battery current collector

[0233] The array base film prepared by S1 was used as a substrate, and then an Al conductive layer was formed on both sides of the array base film by physical vapor deposition technology to prepare a battery current collector; wherein the thickness of the Al conductive layer was 1000 nm.

[0234] Preparation of S3 battery pole pieces

[0235] The battery current collector substrate prepared in S2 is used as a substrate, and then an active coating is formed on the areas corresponding to the first area on both sides of the battery current collector by intermittent coating technology to prepare a battery pole piece.

[0236] Comparative Example 2

[0237] The comparative example of the present application provides a method for preparing a battery electrode, which differs from comparative example 1 in that a Cu conductive layer is formed on both sides of the array base film by physical vapor deposition technology.

[0238] Test Example 1

[0239] Welding strength test of battery pole piece and tab

[0240] Test method: The battery electrodes prepared in Examples 1 to 24 and Comparative Examples 1 and 2 were numbered respectively, and then the tabs were clamped with a Shimadzu electronic universal testing machine AGS-X-10kN model tensile tester. The tensile force N and the width D of the tabs were tested by the tensile tester to pull the tabs off the current collector. Then, the tab welding strength F = N / D can be calculated.

[0241] Table 1 Test results of welding strength between battery pole piece and pole tab

[0242]

[0243]

[0244] Referring to Table 1, it can be seen from the comparison of Examples 1 to 10 and Examples 15 to 24 with Comparative Examples 1 to 2 that the battery electrodes prepared according to the preparation method provided in the embodiments of the present application have significantly higher welding strengths between the battery electrodes and the tabs than the battery electrodes prepared by the conventional preparation method.

[0245] Comparing Example 1 with Examples 11 to 12, it can be seen that when the particle size of the inorganic particles is not within the set range, the welding strength between the prepared electrode plate and the tab is reduced.

[0246] It can be seen from Example 1 and Examples 13 to 14 that when the thickness of the array base film is not within the set range, the welding strength between the prepared electrode plate and the tab is reduced.

[0247] Test Example 2

[0248] Welding pass rate performance test

[0249] Test method:

[0250] The battery electrodes prepared in Examples 1 to 24 and Comparative Examples 1 and 2 were combined and paired to assemble different battery samples. The assembled batteries were then numbered and the corresponding batteries were tested for welding pass rate, average welding resistance, average discharge power in the first cycle, and average discharge power in the 50th cycle.

[0251] It should be noted that in the welding pass rate test, the resistance between the battery electrode and the tab is less than 20mΩ; in the test of the average power of the first cycle discharge, the average power is equivalent to that of a conventional metal foil current collector; in the test of the average power of the 50th cycle discharge, it is equivalent to the first cycle discharge voltage and the rate is 2C.

[0252] Table 2 Battery electrical performance test results

[0253]

[0254]

[0255] Referring to Table 2, it can be seen that the battery assembled with the battery pole pieces prepared by the preparation method provided in the embodiment of the present application has significantly improved electrical performance in terms of welding pass rate, average welding resistance, average discharge power in the first cycle, and average discharge power in the 50th cycle, compared with the battery assembled with conventional battery pole pieces.

[0256] It should be noted that in the test results of the average resistance between the battery pole piece and the pole tab, (-) represents the average resistance between the negative pole piece and the pole tab, and (+) represents the average resistance between the positive pole piece and the pole tab.

[0257] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A battery current collector, characterized in that: include: non-metallic conductive layer; as well as An array base film, the array base film comprising a plurality of first regions distributed in an array and second regions alternately distributed with the first regions, the first regions comprising an organic polymer layer, the second regions comprising an organic polymer layer and a conductive metal located on a surface of and within the organic polymer layer; In the thickness direction of the array base film, the non-metallic conductive layer is located on one side or both sides of the first region, and the exposed second region is the welding area of ​​the battery current collector.

2. The battery current collector according to claim 1, characterized in that: The array distribution is in the form of a linear array; or the array distribution is in the form of a rectangular array.

3. The battery current collector according to claim 1 or 2, characterized in that The thickness of the array base film is 500-20000 nm.

4. The battery current collector according to claim 1 or 2, characterized in that: The conductive metal includes one or more of Ni, Zn, Cu, Co, Mn, Ti, Ga, Ge, Sn, Sb, Zr, Mo, Al, Cr, Ag and alloys of corresponding elements.

5. A battery pole piece, characterized in that: include: The battery current collector according to any one of claims 1 to 4, and an active coating located on the surface of the battery current collector.

6. A battery, characterized in that: Comprising the battery pole piece as claimed in claim 5.

7. A method for preparing an array basement membrane, characterized in that: The array base film includes a plurality of first regions distributed in an array and second regions distributed alternately with the first regions, the first regions include an organic polymer layer, and the second regions include an organic polymer layer and a conductive metal located on the surface and inside of the organic polymer layer; The preparation method comprises the following steps: Mixing a polymer raw material for preparing the array base film and a solvent to obtain a first precursor solution; adding inorganic particles to a portion of the first precursor solution and mixing the mixture to obtain a second precursor solution; Alternating the first precursor liquid and the second precursor liquid to prepare a polymer layer; wherein the first precursor liquid corresponds to the first region, and the second precursor liquid corresponds to the second region; immersing the polymer layer in a pore-forming liquid to dissolve the inorganic particles in the second region and form pores; The raw material for preparing the conductive metal is applied into the holes, and the conductive metal is formed by chemical plating deposition technology.

8. The method for preparing the array basement membrane according to claim 7, wherein: The sheet resistance of the second region is 50-10000 mΩ / □.

9. The method for preparing the array basement membrane according to claim 7, wherein: The particle size of the inorganic particles is 100-2000 nm.

10. The method for preparing an array base film according to any one of claims 7 to 9, wherein: The inorganic particles include one or more of inorganic salt particles, transition metal oxide particles, transition metal sulfide particles, metal elements and alloys thereof.

11. A method for preparing a battery current collector, characterized in that: The following steps are involved: Provided is an array basement membrane prepared by the preparation method according to any one of claims 7 to 10; A metal conductive layer or a non-metal conductive layer is formed on one side or both sides of the first region in the thickness direction of the array base film.

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