CN115425231A - Metal foil, negative electrode material applied to battery and battery - Google Patents

Metal foil, negative electrode material applied to battery and battery Download PDF

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Publication number
CN115425231A
CN115425231A CN202210910576.6A CN202210910576A CN115425231A CN 115425231 A CN115425231 A CN 115425231A CN 202210910576 A CN202210910576 A CN 202210910576A CN 115425231 A CN115425231 A CN 115425231A
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metal foil
battery
conductive layer
layer
negative electrode
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苏陟
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Zhuhai Dachuang Electronics Co ltd
Guangzhou Fangbang Electronics Co Ltd
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Zhuhai Dachuang Electronics Co ltd
Guangzhou Fangbang Electronics Co Ltd
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Priority to CN202210910576.6A priority Critical patent/CN115425231A/en
Publication of CN115425231A publication Critical patent/CN115425231A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H01M4/662—Alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/546—Flexural strength; Flexion stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

The invention discloses a metal foil, a negative electrode material applied to a battery and the battery, wherein the metal foil comprises at least one supporting layer and a conductive layer positioned on at least one surface of the supporting layer, and the relation between the elastic modulus A of the metal foil in the MD direction and the elastic modulus B of the metal foil in the TD direction is as follows: a is larger than B, A is between 400 and 1500MPa, and B is between 320 and 1400 MPa. By adopting the technical means of the invention, the elastic modulus of the metal foil in the MD direction and the TD direction is optimized by improving the structure of the metal foil, the occurrence of the fracture of the metal foil in the application process is effectively avoided, and the quality of the metal foil and the product applying the metal foil is improved.

Description

Metal foil, negative electrode material applied to battery and battery
Technical Field
The invention relates to the technical field of metal foils, in particular to a metal foil, a negative electrode material applied to a battery and the battery.
Background
With the rapid development of the electronic industry, metal foils are widely applied to the fields of printed circuit boards, battery cathode materials, chip packaging and the like, the metal foils are used as current collectors of new energy battery cathodes and core raw materials for manufacturing new energy batteries, and the development of the production technology and the performance of the metal foils directly influence the manufacturing process, the performance and the production cost of the new energy batteries.
In general, in the preparation process of a new energy battery, a negative electrode material active material needs to be coated on the surface of a metal foil, and the negative electrode material active material and the metal foil need to be wound so as to more fully complete the battery chemical reaction. However, the inventors found that the prior art has at least the following problems: the existing metal foil is formed by laminating multiple layers of metal, the density is high, the thickness is large, the mass is heavy, when the metal foil is applied to a new energy battery as a negative electrode material, the density, the thickness and the mass of the battery are influenced, and the requirements of a user on a light, thin and high energy storage battery cannot be met. If the thickness of the existing metal foil is simply reduced, the bending resistance, tensile resistance, buckling resistance and tensile strength of the metal foil are insufficient, so that the metal foil is easy to break in the winding process of battery preparation, and the production efficiency and yield are influenced; in addition, the too thin metal foil is also easy to have the problems of wrinkles, fine stripes and the like in the preparation process, so that the surface flatness and uniformity of the metal foil are reduced, the uniform coating and spreading of the negative electrode active material on the surface of the metal foil is seriously influenced, and the thickness fluctuation is large after the metal foil is coated with the active material, which is to be avoided in the battery preparation. In addition, in the subsequent electrochemical reaction process of the battery, because the existing metal foil has large thickness and strong rigidity, and the properties of the elastic modulus and the like of the product are not improved, the metal foil material is difficult to resist the expansion or contraction deformation of the battery under accidental or extreme conditions, so that the battery performance is reduced or even scrapped due to easy expansion and fracture or contraction, and great potential safety hazards and quality problems are caused to the use of new energy batteries. Meanwhile, if the elastic modulus of each orientation of the metal foil is not sufficiently improved, the copper foil is not balanced in performance in each direction during the process of preparing the battery and during welding after subsequent winding, so that the internal stress of the material in the battery is increased easily, and the possibility of deformation is greatly increased, which is a practical problem to be avoided.
Disclosure of Invention
The embodiment of the invention aims to provide a metal foil, a negative electrode material applied to a battery and the battery, wherein the structure of the metal foil is improved, so that the metal foil is effectively prevented from being broken in the application process, and the quality of the metal foil and a product applying the metal foil is improved.
In order to achieve the above object, an embodiment of the present invention provides a metal foil, including at least one support layer and a conductive layer on at least one side of the support layer, where a relationship between an elastic modulus a in an MD direction of the metal foil and an elastic modulus B in a TD direction of the metal foil is: a is more than B, A is between 400 and 1500MPa, B is between 320 and 1400 MPa; in the use state, the support layer of the metal foil does not need to be peeled off from the conductive layer.
As a modification of the scheme, the total thickness of the metal foil is H less than or equal to 10 mu m.
As an improvement of the above, the metal foil has an average elongation of 3% or more in the MD direction and the TD direction, and/or the metal foil has an average tensile strength of 18.5kgf/mm or more in the MD direction and the TD direction 2 。
As a modification of the above-mentioned embodiment, the material of the conductive layer includes at least one metal and/or an alloy formed of at least one metal selected from copper, aluminum, iron, zinc, titanium, cobalt, gold, silver, nickel, chromium, indium, gallium, tin, thallium, lead, bismuth, germanium, antimony, polonium, beryllium, magnesium, calcium, strontium, barium, radium, lanthanoid metals, actinide metals, and transition metals;
and/or the thickness of the conductive layer is less than or equal to 1 μm;
and/or the surface arithmetic average roughness Ra of the conductive layer is between 0.05 and 0.95 mu m.
As an improvement of the scheme, when the metal foil is baked at 140 ℃ for 15-25 min, the number of oxidation points oxidized on the surface of the conductive layer is less than or equal to 5.
As an improvement of the scheme, the total number of pinholes on the surface of the conductive layer is less than or equal to 98/m 2 。
As an improvement of the above scheme, the metal foil further includes an anti-oxidation layer, the anti-oxidation layer is located on at least one surface of the conductive layer, and the thickness of the anti-oxidation layer is 5% -30% of the thickness of the conductive layer.
As an improvement of the above scheme, the metal foil further comprises a bonding layer, the bonding layer is positioned on one side surface of the conductive layer far away from the support layer, and the adhesion amount of the bonding layer on the surface of the conductive layer is less than or equal to 150mg/m 2 。
The embodiment of the invention provides a negative electrode material applied to a battery, wherein the negative electrode material comprises a negative electrode active material and a metal foil as described in any one of the above, and the metal foil is tightly adhered to the negative electrode active material.
As an improvement of the above scheme, the supporting layer in the metal foil is made of an insulating material.
The embodiment of the invention provides a battery, and the negative electrode material of the battery is the negative electrode material applied to the battery.
Compared with the prior art, the metal foil, the negative electrode material applied to the battery and the battery disclosed by the embodiment of the invention are provided. The metal foil comprises at least one supporting layer and a conductive layer arranged on at least one side of the supporting layer, and the elastic modulus A of the metal foil in the MD direction and the elastic modulus B of the metal foil in the TD direction have the following relation: a is more than B, A is between 400 and 1500MPa, and B is between 320 and 1400 MPa. By adopting the technical means of the embodiment of the invention, the elastic modulus of the metal foil in the MD direction and the TD direction is in a reasonable range, so that the metal foil has excellent bending resistance, tensile resistance, warpage resistance, tensile strength and reasonable deformation capability, and the increase and reduction of lattice parameters of a negative electrode material caused by lithium intercalation and delithiation chemical reactions of the negative electrode material of a lithium ion battery in the charging and discharging processes and the excessive expansion and contraction of the thickness of a negative electrode plate are avoided when the metal foil is applied to a new energy battery. Meanwhile, the possibility of unsafe accidents such as battery ignition and the like caused by the fact that the supporting layer in the middle of the metal foil is punctured and the internal short circuit of the battery is caused due to the fact that the material shrinks excessively under the poor conditions of low temperature, external force impact, collision and the like can be improved or reduced. In addition, the elastic modulus A of the metal foil in the MD direction is larger than the elastic modulus B of the metal foil in the TD direction, so that the winding scene in the process of preparing the battery negative electrode material can be better adapted, and the situation that the metal foil is easy to break in the process of winding in the MD direction is avoided. Meanwhile, the improvement of the invention can also reduce or improve the problems that the thinner metal foil is easy to generate wrinkles, fine stripes and the like in the preparation process, ensure the surface evenness and uniformity of the metal foil, improve and improve the coating and spreading uniformity and the surface evenness of the negative active material on the surface of the negative active material, avoid the larger fluctuation of the thickness of the metal foil after the active material is coated, improve the gap uniformity in the winding of the battery and improve the quality and the performance of the battery. Moreover, through the improvement of the invention, the stretching along the production line direction (MD direction) in the battery preparation process and the unbalance of the copper foil performance in all directions during welding after subsequent winding are reduced, the increase of the internal stress of the material in the battery is reduced, the possibility of deformation of the material is further reduced, and the stability and reliability of the material and the battery are improved.
Drawings
FIG. 1 is a schematic structural diagram of a first metal foil provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a second metal foil provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a third metal foil provided in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fourth metal foil provided in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a fifth metal foil provided in an embodiment of the present invention;
wherein, 1, a supporting layer; 2. a conductive layer; 21. a first conductive layer; 22. a second conductive layer; 3. an anti-oxidation layer; 4. and bonding the layers.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the specification and claims, it is to be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", and the like are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings, which is for convenience in describing the embodiments of the present invention, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore, should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms first, second and the like in the description and in the claims, are used for descriptive purposes only to distinguish one technical feature from another, and are not to be construed as indicating or implying relative importance or to imply that the indicated technical features are in number, nor necessarily order or temporal order. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, a schematic structural diagram of a first metal foil according to an embodiment of the present invention is shown. The embodiment of the invention provides a metal foil, which comprises at least one supporting layer 1 and a conducting layer 2 positioned on at least one surface of the supporting layer 1, wherein the supporting layer 1 and the conducting layer 2 are arranged in a stacked mode. The relationship between the elastic modulus A of the metal foil in the MD direction and the elastic modulus B of the metal foil in the TD direction is as follows: a is larger than B, A is between 400 and 1500MPa, and B is between 320 and 1400 MPa.
The MD direction of the metal foil refers to the longitudinal direction of the metal foil, i.e., parallel to the line conveying direction, and the TD direction of the metal foil refers to the thickness direction of the metal foil, i.e., perpendicular to the line conveying direction.
Compared with the metal foil formed by stacking multiple layers of metal in the prior art, the metal foil provided by the embodiment of the invention has the advantages that the thickness and the weight of the metal foil can be obviously reduced, and the thickness and the weight of products using the metal foil subsequently, such as new energy batteries and other products, are also too large, so that the requirements of users on light, thin and high energy storage battery products cannot be met.
In addition, in order to avoid the problems that the bending resistance, the tensile resistance and the tensile strength of the thin metal foil are insufficient, so that the metal foil is easy to break in the winding process of battery preparation, and the production efficiency and the yield are affected, in the embodiments of the present invention, the elastic modulus a in the MD direction and the elastic modulus B in the TD direction of the metal foil are further optimized, so that the elastic modulus a is greater than the elastic modulus B, and the elastic modulus a is controlled to be between 400MPa and 1500MPa, for example, 400MPa, 450MPa, 580MPa, 690MPa, 720MPa, 750MPa, 780MPa, 800MPa, 810MPa, 830MPa, 860MPa, 900MPa, 930MPa, 880MPa, 970MPa, 1000MPa, 1020MPa, 1050MPa, 1080MPa, 1100MPa, 1250MPa, 1190MPa, 1200MPa, 1160MPa, 1300MPa, 1400MPa or 1500MPa, although the elastic modulus a may be any other values between 400MPa and 1500MPa, which are not repeated here. The elastic modulus B is controlled to be between 320 and 1400MPa, and may be, for example, 300MPa, 400MPa, 460MPa, 580MPa, 600MPa, 640MPa, 670MPa, 690MPa, 720MPa, 750MPa, 780MPa, 800MPa, 810MPa, 830MPa, 860MPa, 880MPa, 900MPa, 930MPa, 950MPa, 970MPa, 1000MPa, 1020MPa, 1050MPa, 1080MPa, 1100MPa, 1130MPa, 1160MPa, 1180MPa, 1250MPa, 1380MPa or 1400MPa, although the elastic modulus B may be any other value between 320 and 1400MPa, and will not be described herein again.
More preferably, A is between 690 and 1250MPa and B is between 580 and 1180 MPa.
By adopting the technical means of the embodiment of the invention, the elastic modulus of the metal foil in the MD direction and the TD direction is within a reasonable range, so that the metal foil has excellent bending resistance, tensile resistance, warpage resistance, tensile strength and reasonable deformation capability, and the increase and reduction of lattice parameters of the negative electrode material caused by lithium intercalation and lithium deintercalation chemical reactions in the charging and discharging processes of the negative electrode material of the lithium ion battery can be improved, and the excessive expansion and contraction of the thickness of the negative electrode material can be avoided, namely, when the metal foil is used as the negative electrode material of the new energy battery to participate in the chemical reaction of the battery, the thickness of the negative electrode material can be effectively controlled in the chemical reaction process, the expansion rate of the metal foil is ensured within a reasonable deformation range, and the situation that under extreme conditions, for example, the internal heat of the battery is too high to cause the expansion and further explosion and short circuit can be avoided, and when the material is deformed by all external forces such as electrochemical reaction or external collision, the metal foil is easy to break (if the elastic modulus of the material is designed insufficiently, the material is too strong, the material is deformed, and is difficult to cause thermal failure when the battery is heated). Meanwhile, the method can prevent unsafe accidents such as battery ignition and the like caused by the puncture of the supporting layer in the middle of the metal foil due to the self-retraction of the negative electrode material caused by excessive material shrinkage under the conditions of low temperature and the like. In addition, the elastic modulus A of the metal foil in the MD direction is larger than the elastic modulus B of the metal foil in the TD direction, so that the winding scene in the process of preparing the battery negative electrode material can be better adapted, and the situation that the metal foil is easy to break in the process of winding in the MD direction is avoided. Meanwhile, the improvement can also reduce or improve the problems that the thinner metal foil is easy to generate wrinkles, fine stripes and the like in the preparation process, ensure the surface evenness and uniformity of the metal foil, improve and improve the coating and spreading uniformity and the surface evenness of the negative electrode active material on the surface of the negative electrode active material, avoid the larger fluctuation of the thickness of the metal foil after the active material is coated, improve the gap uniformity in the winding of the battery and improve the quality and the performance of the battery. In addition, through the improvement, the stretching along the production line direction (MD direction) in the battery preparation process and the unbalance of the performance of the copper foil in each direction during welding after subsequent winding are reduced, the increase of the internal stress of the material in the battery is reduced, the possibility of deformation of the material is further reduced, and the stability and the reliability of the material and the battery are improved.
Preferably, when n metal foil samples are randomly selected and each metal foil sample is subjected to the test of the elastic modulus of at least 3 test points, the average elastic modulus of the n metal foil samples in the MD direction is 882.56Mpa, and the average elastic modulus of the n metal foil samples in the TD direction is 790.669Mpa, wherein n is more than 10; optionally, n =13.
By adopting the embodiment of the invention, the average elastic modulus of the plurality of metal foils is controlled to be in a reasonable range, so that the elastic deformation of each metal foil product can be ensured to be in a reasonable range, the stability and the qualification rate of the metal foil products are ensured, and the problems of battery breakage, short circuit and the like are further reduced.
In an alternative embodiment, when the metal foil is applied to the field of new energy batteries, the metal foil is used as a negative electrode material of a battery and is hot-pressed and bonded with a negative electrode active material in the negative electrode material through the conductive layer.
As a preferred embodiment, refer to fig. 2, which is a schematic structural diagram of a second metal foil provided in an embodiment of the present invention. The metal foil is structurally provided with three layers, wherein the three layers comprise a supporting layer 1 and two conducting layers 2 which are respectively a first conducting layer 21 and a second conducting layer 22, and the first conducting layer 21, the supporting layer 1 and the second conducting layer 22 are sequentially stacked.
By adopting the technical means of the embodiment of the invention, when the metal foil is used as the negative electrode material of the new energy battery, through the design of the three-layer structure, the surface of the conductive layer at the two sides of the supporting layer is provided with the active material for battery reaction, so that the metal foil and the negative electrode material fully generate electrochemical reaction, the utilization rate of the negative electrode material of the battery is improved, and meanwhile, the distribution of more negative electrode materials in the limited internal space of the battery can be realized by cooperating with the optimal and reasonable thickness of the application and the weight control of each layer of material, thereby effectively improving the energy density of the battery and reducing the weight of the battery compared with the traditional metal foil. Meanwhile, the arrangement of the three-layer symmetrical structure is more beneficial and stable to the material performance of the battery and the electrochemical reaction as a whole.
Of course, an auxiliary layer may be further added between the support layer 1 and the conductive layer 2, so that the auxiliary conductive layer 2 is more firmly adhered to the surface of the support layer 1, the occurrence of shedding or peeling is reduced, and meanwhile, the peeling force between the conductive layer 2 and the support layer 1 is enhanced. But the introduction of the auxiliary layer is premised on not increasing the internal resistance and the thickness of the battery too much.
As a preferable mode, the method is further performed on the basis of the above examples, wherein the total thickness of the metal foil is H.ltoreq.10 μm.
By adopting the technical means of the embodiment of the invention, the overall thickness of the metal foil is optimized, so that the structure of the metal foil is lighter and thinner, the weight of the battery is favorably reduced when the metal foil is applied to a new energy battery, and in a battery pack with a certain volume, the lighter and thinner the structure of the metal foil is, the more metal foil materials are wound, the more electrolyte and the more active substances of a negative electrode material are coated on the surface, so that the energy density and the weight of the battery are effectively improved, and the endurance mileage of the battery is effectively improved.
Preferably, the total thickness of the metal foil is H ≦ 6 μm.
More preferably, the total thickness of the metal foil is 3. Ltoreq. H.ltoreq.5.5. Mu.m, and may be, for example, 3. Mu.m, 3.2. Mu.m, 3.5. Mu.m, 3.6. Mu.m, 3.7. Mu.m, 3.8. Mu.m, 3.9. Mu.m, 4. Mu.m, 4.1. Mu.m, 4.2. Mu.m, 4.3. Mu.m, 4.4. Mu.m, 4.5. Mu.m, 4.6. Mu.m, 4.7. Mu.m, 4.8. Mu.m, 5. Mu.m, 4.2. Mu.m, or 4.5. Mu.m. Of course, the thickness of the metal foil may be any other value between 3 μm and 5.5 μm, which is not described in detail herein.
By adopting the technical means of the embodiment of the invention, the overall thickness of the metal foil is further optimized, so that the total thickness of the metal foil is not too thin or too thick and is in a most excellent and reasonable range. The thickness of the metal foil cannot be too thin, so that the situation that the metal foil is damaged easily or the negative electrode material is broken in the winding process in the battery preparation process is avoided, and the situation that the weight and the volume of the metal foil are too large, so that the weight of the battery is not favorably reduced and the energy density is not favorably improved is avoided.
In a preferred embodiment, the average elongation in the MD direction and the TD direction of the metal foil is 3% or more; the average tensile strength of the metal foil in the MD direction and TD direction is not less than 18.5kgf/mm 2 。
Preferably, the metal foil has an average elongation of 4.5% or more in the MD direction and the TD direction.
By adopting the technical means of the embodiment of the invention, the elongation and tensile strength of the metal foil are specifically optimized and improved, so that the elongation and tensile strength of the metal foil are in a reasonable range, the situation that the metal foil breaks as a battery cathode material in the winding process can be reduced, the phenomenon that the material is easy to deform, such as cracking, warping and the like, due to excessive increase of internal stress of the battery inner material after winding is avoided, and the situations of deformation, warping, swelling and the like of the battery cathode material in electrochemical reaction are further avoided.
As a preferred embodiment, the conductive layer 2 comprises a single metal conductive layer and/or an alloy conductive layer; wherein the single-metal conductive layer is made of any one of copper, aluminum, iron, zinc, titanium, cobalt, gold, silver, nickel, chromium, indium, gallium, tin, thallium, lead, bismuth, germanium, antimony, polonium, beryllium, magnesium, calcium, strontium, barium, radium, a lanthanide metal, an actinide metal, and a transition metal, the alloy conductive layer is made of any two or more of copper, aluminum, iron, zinc, titanium, cobalt, gold, silver, nickel, chromium, indium, gallium, tin, thallium, lead, bismuth, germanium, antimony, polonium, beryllium, magnesium, calcium, strontium, barium, radium, a lanthanide metal, an actinide metal, and a transition metal, and may be made by mixing any two or more of the above metals with other materials.
Furthermore, the thickness of the conductive layer is less than or equal to 1 μm, and the surface arithmetic average roughness Ra of the conductive layer is between 0.05 and 0.95 μm.
The arithmetic average roughness Ra is specifically an arithmetic average of absolute values of ordinate Z (x) of the profile within one sampling length, and the ordinate Z (x) refers to a distance from each point on the profile to a profile center line. The arithmetic mean roughness Ra is an arithmetic mean deviation for evaluating the surface profile, which can sufficiently reflect the properties of the surface micro-geometry in terms of height.
By adopting the technical means of the embodiment of the invention, the material of the conducting layer 2 of the metal foil is further optimized, so that the conducting layer 2 has the characteristics of good conductivity, low resistance, good tensile strength and the like, the thickness of the metal foil and the surface arithmetic average roughness Ra are further optimized, the thickness of the conducting layer is less than or equal to 1 μm, such as 0.8 μm, 0.6 μm, 0.5 μm, 0.4 μm, 0.3 μm, 0.2 μm or 0.1 μm, and the like, the whole thickness of the metal foil is further reduced due to the thinner conducting layer, the volume and the weight of the metal foil are prevented from being overlarge, and, the roughness of the surface of the conductive layer is ensured by optimizing the arithmetic average roughness of the surface of the conductive layer to be between 0.05 and 0.95 mu m, such as 0.05 mu m, 0.1 mu m, 0.2 mu m, 0.3 mu m, 0.4 mu m, 0.45 mu m, 0.5 mu m, 0.55 mu m, 0.6 mu m, 0.65 mu m, 0.7 mu m, 0.75 mu m, 0.8 mu m, 0.9 mu m or 0.95 mu m, and the like, so that the roughness of the surface of the conductive layer is ensured, and further, when the conductive layer is applied to the field of new energy batteries, the binding power of the conductive layer and a negative electrode active substance is effectively improved, the adhesion effect is greatly improved, the active substance is prevented from falling off in the winding process, and the quality and the service life of the batteries are improved.
In a preferred embodiment, when the metal foil is baked at 140 ℃ for 15min to 25min, the number of oxidation points on the surface of the conductive layer where oxidation occurs is less than or equal to 5.
By adopting the technical means of the embodiment of the invention, the number of the oxidation points on the surface of the conductive layer of the metal foil is controlled within a reasonable acceptable range under the limit conditions of high temperature, high pressure and the like of the metal foil by controlling the structure, the manufacturing process and the like of the metal foil, so that the stability of various performances of the metal foil when the metal foil is applied to a battery cathode material is ensured, and the condition that the internal resistance of the battery is increased inefficiently due to excessive oxidation points, and the energy conversion efficiency of the battery is further reduced is avoided. Meanwhile, the reasonable range of the oxidation points is controlled, the problems of poor adhesion, loose adhesion, air bubbles and the like of the cathode active material and the surface of the metal foil due to excessive oxidation points are solved, the coating and spreading uniformity and the surface flatness of the cathode active material on the surface of the metal foil are facilitated, the falling and cracking of the cathode material in the winding process are reduced, and the product quality of the battery and the stability and reliability of electrochemical reaction are improved.
As a preferable mode, the embodiment of the present invention is further implemented on the basis of any of the above-described embodiments, and a plurality of pinholes are inevitably present on the surface of the conductive layer 2. The total number of pinholes on the surface of the conductive layer 2 is 98/m or less 2 . Preferably, the total number of pinholes is less than or equal to 50/m 2 。
By adopting the technical means of the embodiment of the invention, the surface of the conducting layer 2 of the metal foil inevitably has a certain number of pinholes, and the structure and the stability of various performances of the metal foil are further ensured by controlling the number of the pinholes of the conducting layer within an acceptable range, so that the situation that in the field of new energy batteries, negative active substances, electrolyte and the like are subjected to a large reaction with a supporting layer of the metal foil through the permeation of the pinholes, the damage to the supporting layer is further avoided, the reasonable rigidity and the normal structure of the metal foil are effectively maintained, and the electrochemical reaction and the functions of the batteries are not influenced is ensured.
As a preferred implementation manner, refer to fig. 3, which is a schematic structural diagram of a third metal foil provided in an embodiment of the present invention. The embodiment of the present invention is further implemented on the basis of any of the above embodiments, where the metal foil further includes an oxidation resistant layer 3, the oxidation resistant layer 3 is located on at least one surface of the conductive layer 2, and the thickness of the oxidation resistant layer 3 is 5% to 30% of the thickness of the conductive layer 2.
In the present embodiment, an oxidation-resistant layer 3 is coated on one or both surfaces of each conductive layer 2 or a surface of a material in contact with the surface of the conductive layer. For example, when the metal foil has a three-layer structure in which the first conductive layer 21, the support layer 1, and the second conductive layer 22 are sequentially stacked, the antioxidation layer 3 is additionally provided on one or both surfaces of the first conductive layer 21, and/or the antioxidation layer 3 is additionally provided on one or both surfaces of the second conductive layer 22.
By adopting the technical means of the embodiment of the invention, the antioxidation performance of the surface of the conductive layer is effectively improved by coating the antioxidation layer on the surface of the conductive layer or coating the antioxidation layer on the surface of the material in contact with the surface of the conductive layer, when the conductive layer is applied to the field of new energy batteries, the occurrence of the bonding oxidation reaction between the surface of the conductive layer and an active substance and the occurrence of oxidation when the surface of the conductive layer is in contact with an electrolyte can be well avoided, and the application life of the metal foil and the stability of the battery are improved. And by the optimal design of the thickness of the oxidation resisting layer, the oxidation resistance of the conducting layer and the utilization rate of battery materials are effectively improved on the premise of not excessively increasing the weight of the metal foil and the reaction internal resistance of the battery.
As a preferred embodiment, the metal foil further comprises a bonding layer 4.
In an alternative implementation manner, referring to fig. 4, a schematic structural diagram of a fourth metal foil provided in the embodiment of the present invention is shown. The metal foil comprises a support layer 1, a conductive layer 2 and a bonding layer 4, and the bonding layer 4 is positioned on the surface of the conductive layer 2 on the side far away from the support layer 1. For example, when the metal foil has a three-layer structure in which the first conductive layer 21, the support layer 1, and the second conductive layer 22 are stacked in this order, the bonding layer 4 is additionally provided on the outer surface of the first conductive layer 21, and the bonding layer 4 is additionally provided on the outer surface of the second conductive layer 22. And the adhesion amount of the bonding layer on the surfaces of the first conductive layer 21 and the second conductive layer 22 is less than or equal to 150mg/m 2 。
In another alternative implementation, referring to fig. 5, a schematic structural diagram of a fifth metal foil according to an embodiment of the present invention is shown. The metal foil comprises a supporting layer 1, a conductive layer 2, an oxidation resistant layer 3 and a bonding layer 4, wherein the bonding layer 4 is positioned on the surface of one side, far away from the conductive layer 2, of the oxidation resistant layer 3. For example, when the metal foil is a multilayer structure in which the antioxidation layer 3, the first conductive layer 21, the support layer 1, the second conductive layer 22 and the antioxidation layer 3 are sequentially stacked, the bonding layer 4 is additionally arranged on the surfaces of the antioxidation layers 3 on two sides, that is, the antioxidation layer 3 is positioned between the conductive layer 2 and the bonding layer 4, and the adhesion amount of the bonding layer on the surface of the antioxidation layer is less than or equal to 150mg/m 2 。
By adopting the technical means of the embodiment of the invention, through designing the bonding layer and optimizing the adhesion amount of the bonding layer, when the bonding layer is applied to the field of new energy batteries, the maximum adhesion and the bonding property between the surface of the conductive layer of the metal foil and the negative active material of the battery can be ensured, the negative active material is prevented from peeling off and falling off from the surface of the conductive layer, meanwhile, the adhesion amount of the bonding layer is ensured to be in a reasonable range, and the phenomenon that the weight and the volume of the metal foil are increased due to too much bonding auxiliary agent of the bonding layer, and the weight control of the battery and the improvement of the energy density are influenced can be avoided.
The bonding assistant forming the bonding layer is specifically an organic bonding assistant, an inorganic assistant, or a mixture of the organic bonding assistant and the inorganic assistant in a certain ratio, which can improve the adhesion between the active material and the metal foil, and can contain a group capable of crosslinking with or bonding to the negative electrode active material through a chemical bond thereof, for example: carboxyl group, hydroxyl group, and the like, and the specific kind of the bonding assistant is not limited.
In a preferred embodiment, the adhesion amount of the bonding layer to the surface of the conductive layer or the oxidation resistant layer is 120mg/m or less 2 And is not less than 26mg/m 2 。
By adopting the technical means of the embodiment of the invention, the adhesion amount of the bonding layer is further optimized to be within a reasonable range, and the adhesion and the bonding property between the conducting layer and the cathode active material are ensured, the increase of the weight and the volume of the metal foil is avoided, and the light weight and the larger energy density of the battery are ensured.
The breaking rate, the tensile rate and the tensile strength of the metal foil with the structure of the embodiment of the invention and the comparative sample in the winding process are respectively tested by taking a common metal foil as a comparative sample, wherein S represents the metal foil with the structure of the embodiment of the invention and comprises samples S1, S2, S3, S4 and S5; r represents a common metal foil, including control samples R1 and R2.
Specific test data and comparative results are shown in table 1:
TABLE 1
Figure BDA0003773879610000131
The elastic modulus in the MD direction, the elastic modulus in the TD direction, the tensile rate, and the tensile strength of the metal foil can be measured by an electronic universal tester, and obtained by inputting parameters such as the thickness, the length, and the width of the metal foil into test software. In order to improve the accuracy of the test result, each group of data is repeatedly tested for more than 30 times, and all results are averaged to be used as the final test result. Wherein the length of the metal foil test sample is more than 150mm and the width is 10mm.
The method for testing the breaking rate in the winding process comprises the following steps: and (3) carrying out a battery cathode winding processing simulation experiment on a certain number of metal foil products, and calculating the ratio of the number of the fractures to the total experiment number to obtain the fracture rate in the winding process. The specific winding processing simulation experiment steps comprise: coating the negative electrode active material with the same adhesion amount on the two side surfaces of each metal foil, pressing by using a double-sided compression roller of a press machine to promote the close joint of the active material and the metal foil surface, winding, calculating the fracture condition of the metal foil in the winding process, and observing the joint condition of the active material and the metal foil surface, such as the phenomena of no separation and cracking. The single samples were accumulated for 10 to 30 times in total.
As can be seen from the above comparative table, in the case that the total thickness of the metal foil sample is smaller or equal to that of the comparative sample, the elastic moduli of the metal foil in the MD direction and the TD direction are both better than those of the comparative sample, so that when the metal foil is applied to manufacturing a new energy battery, the metal foil has a lower breaking rate during winding, a higher tensile rate and a higher tensile strength, and shows a certain warpage resistance, and each property is better than that of the comparative sample.
An embodiment of the present invention further provides a negative electrode material applied to a battery, where the negative electrode material includes a negative electrode active material, and the metal foil according to any one of the above embodiments, and in this case, the structure of the metal foil specifically includes: at least one conductive layer is formed on each of the two side surfaces of the support layer, the negative electrode active material is formed on the outer side surface of the outermost conductive layer on each of the two side surfaces of the support layer, and the metal foil is tightly bonded to the negative electrode active material.
The embodiment of the invention also provides a battery, and the negative electrode material of the battery is the negative electrode material applied to the battery.
It should be noted that, the structure of the metal foil may refer to the structure of the metal foil described in any of the above embodiments, and details are not described herein.
By adopting the technical means of the embodiment of the invention, the application of taking the metal foil as the negative electrode carrier or the current collector of the battery has the following advantages: by optimizing the value range and the size relationship of the elastic modulus of the metal foil in the MD direction and the elastic modulus of the metal foil in the TD direction and further matching with the improvement of the thickness, the structural composition and the like of the metal foil, the metal foil has excellent bending resistance, tensile resistance, warping resistance, tensile strength and reasonable deformation capacity, and further the metal foil is used as a negative electrode material of a new energy battery to ensure that the expansion rate of the metal foil is within the reasonable deformation range when participating in the chemical reaction of the battery, so that the unsafe accidents such as explosion short circuit caused by incapability of expansion due to overhigh heat inside the battery or battery outer package expansion rupture caused by material deformation caused by the electrochemical reaction, battery failure and the like are avoided under the extreme conditions. Meanwhile, the situation that the battery is in fire and other unsafe accidents are caused by the fact that the battery is in short circuit due to puncture of the supporting layer in the middle of the metal foil caused by self shrinkage of the negative electrode material due to excessive shrinkage of the material under the conditions of low temperature, external force or collision and the like can be prevented, and the situation that the battery is easy to break in the winding process can be avoided. Meanwhile, the improvement can also reduce or improve the problems that the thinner metal foil is easy to generate wrinkles, fine stripes and the like in the preparation process, ensure the surface evenness and uniformity of the metal foil, improve and improve the coating and spreading uniformity and the surface evenness of the negative electrode active material on the surface of the negative electrode active material, avoid the larger fluctuation of the thickness of the metal foil after the active material is coated, improve the gap uniformity in the winding of the battery and improve the quality and the performance of the battery. In addition, through the improvement, the stretching along the production line direction (MD direction) in the battery preparation process and the unbalance of the performance of the copper foil in each direction during welding after subsequent winding are reduced, the increase of the internal stress of the material in the battery is reduced, the possibility of deformation of the material is further reduced, and the stability and the reliability of the material and the battery are improved.
In a preferred embodiment, the support layer in the metal foil is an insulating material.
In particular, the insulating material may be: polyethylene naphthalate (PEN), polyamide, polyethylene terephthalate (PET), polyimide (PI), polyester terephthalate, polytetrafluoroethylene (ptfe), polyethylene (PE), polyvinyl chloride (pvc), polystyrene, polypropylene (PP), acrylonitrile-butadiene-styrene copolymer, silicone rubber, polybutylene terephthalate, polyparaphenylene terephthalamide, polypropylene, polyoxymethylene, epoxy resin, polycarbonate, phenol resin, and polyvinylidene fluoride.
By adopting the technical means of the embodiment of the invention and adopting the insulating material as the supporting layer of the metal foil, the situation of short circuit in the extreme situation of the interior of the battery, such as the situation of overhigh heat in the interior of the battery, can be effectively reduced, and the safety of the battery is improved.
The support layer is preferably made of polyethylene terephthalate (PET), namely a PET film, so that the thickness of the support layer is very thin and is between 2 and 4 mu m, the weight of the battery is favorably reduced, and the more the wound metal foil materials are in a battery pack with a certain volume, the more the electrolyte and the more the cathode material active substances are coated, the energy density of the battery is effectively improved, and the endurance mileage of the battery is effectively improved. And the PET film has good elasticity, high tensile strength and high tensile strength, and the fracture resistance of the battery is effectively improved.
It should be noted that the battery provided in the embodiment of the present invention may be applied to various types of devices, including but not limited to portable electronic devices, electric vehicles, electric toys, and electric tools, for example, the portable electronic devices include mobile phones and notebook computers, the electric vehicles include battery cars, electric automobiles, electric ships, and spacecraft, the electric toys include game machines and electric automobile toys, and the electric tools include electric drills, electric wrenches, electric screwdrivers, and the like.
The embodiment of the present invention further provides a conductive material using the metal foil provided in any one of the above embodiments, and the structure of the metal foil may refer to the structure of the metal foil described in any one of the above embodiments, which is not described herein again.
When applied as other conductive materials, the support layer of the metal foil is a conductive material, and the specific type is not limited. In an optional manner, a plurality of conducting particles may be dispersed in the supporting layer to conduct, where the conducting particles may be metal ions of one or more selected from the material selection classes of the conducting layers listed in the present application, and the particle size of the metal particles is less than or equal to 30nm; preferably 15nm or less.
In another optional mode, a conduction channel is formed in the support layer, a conduction material is arranged in the channel for conduction, the conduction channel may be square, circular, irregular, or the like, the area of an opening of the conduction channel accounts for 30% -70% of the largest side surface area of the support layer, after the conduction channel is formed, the weight ratio of the conduction material is more than 50%, preferably 60% -85%, when the conduction channel is not formed, the conduction material may also be a metal or nonmetal material, when the conduction material is a metal material, one or more of the materials of the conductive layer in the above embodiments may be selected, when the conduction material is nonmetal, the conduction material may be graphite conductive carbon black, graphene, CNT (carbon nanotube), or the like, and the conduction material may be formed on the inner wall or filled in the conduction channel by being arranged inside the conduction channel, without affecting the beneficial effects of the present invention.
In yet another alternative, the support layer is provided as an improved metallic or non-metallic conductive material with a strong elongation and elastic modulus, such as conductive carbon black, graphite, graphene, CNT (carbon nanotubes), etc.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (11)

1. A metal foil comprising at least one support layer and a conductive layer on at least one side of the support layer, wherein the metal foil has a relationship between the elastic modulus a in the MD direction and the elastic modulus B in the TD direction: a is more than B, A is between 400 and 1500MPa, B is between 320 and 1400 MPa; in the use state, the support layer of the metal foil does not need to be peeled off from the conductive layer.
2. The metal foil of claim 1, wherein the metal foil has a total thickness H ≦ 10 μm.
3. The metal foil as claimed in claim 1, wherein the metal foil has an average elongation of 3% or more in the MD direction and the TD direction, and/or the metal foil has an average tensile strength of 18.5kgf/mm or more in the MD direction and the TD direction 2 。
4. A metal foil as claimed in any one of claims 1 to 3, wherein the material of the electrically conductive layer comprises at least one metal and/or an alloy of at least one of copper, aluminium, iron, zinc, titanium, cobalt, gold, silver, nickel, chromium, indium, gallium, tin, thallium, lead, bismuth, germanium, antimony, polonium, beryllium, magnesium, calcium, strontium, barium, radium, lanthanides, actinides and transition metals;
and/or the thickness of the conductive layer is less than or equal to 1 μm;
and/or the surface arithmetic average roughness Ra of the conductive layer is between 0.05 and 0.95 mu m.
5. The metal foil according to any one of claims 1 to 3, wherein the number of oxidation sites at which oxidation occurs on the surface of the conductive layer is 5 or less when the metal foil is subjected to baking conditions of 140 ℃ for 15 to 25 minutes.
6. The metal foil of any one of claims 1 to 3, wherein the total number of pinholes on the surface of the conductive layer is 98/m or less 2 。
7. The metal foil of any one of claims 1 to 3, further comprising an oxidation resistant layer on at least one surface of the electrically conductive layer, wherein the oxidation resistant layer has a thickness of 5% to 30% of the thickness of the electrically conductive layer.
8. The metal foil according to any one of claims 1 to 3, further comprising a bonding layer on a surface of the conductive layer on a side away from the support layer, wherein an adhesion amount of the bonding layer to a surface of the conductive layer is 150mg/m or less 2 。
9. A negative electrode material for a battery, wherein the negative electrode material comprises a negative electrode active material, and the metal foil according to any one of claims 1 to 8, and the metal foil is tightly adhered to the negative electrode active material.
10. A negative electrode material for a battery as claimed in claim 9, wherein the support layer in the metal foil is an insulating material.
11. A battery characterized in that the negative electrode material of the battery is the negative electrode material for battery application according to claim 9 or 10.
CN202210910576.6A 2022-07-29 2022-07-29 Metal foil, negative electrode material applied to battery and battery Pending CN115425231A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115881974A (en) * 2023-02-23 2023-03-31 广州方邦电子股份有限公司 Composite metal foil, electrode material and battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115881974A (en) * 2023-02-23 2023-03-31 广州方邦电子股份有限公司 Composite metal foil, electrode material and battery

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