Preparation method and application of nickel-iron-copper alloy foil

Abstract

The preparation method of the nickel-iron-copper alloy foil and the application of the nickel-iron-copper alloy foil provided by the embodiment of the invention comprise the following steps: providing an electrolyte for preparing the nickel-iron-copper alloy foil, the invention relates to a nickel sulfate electrolyte which comprises 100-200 parts by mass of nickel sulfate hexahydrate, 10-60 parts by mass of ferrous sulfate pentahydrate, 10-60 parts by mass of copper sulfate pentahydrate, 0.2-0.5 part by mass of hydrogen chloride, 40-100 parts by mass of boric acid, 2-10 parts by mass of saccharin sodium salt and 0.2-0.5 part by mass of a wetting agent. Supplying an electrolyte for preparing a nickel-iron-copper alloy foil between the anode plate and the cathode roller; applying a voltage between the anode plate and the cathode roller, and electrolyzing an electrolyte for preparing the nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller; the concentration of chloride ions in the electrolyte is controlled within a low range, and the adding proportion of the acid-base regulator, the brightener and the wetting agent is controlled, so that the tensile strength and the ductility of the nickel-iron-copper alloy foil are improved.

Description

Technical Field

[0001] The present application relates to the technical field of alloy foil manufacturing, and in particular to a preparation method and application of nickel-iron-copper alloy foil. Background Art

[0002] Alloy foil is an alloy material with excellent electrical and mechanical properties, corrosion resistance, and soft magnetic properties. It is widely used in the electronics and electrical industries, particularly in communications, radar, electronic computers, and automatic control instruments, where it has become an indispensable component. With the advancement of science and technology, the materials required in many high-tech fields are becoming lighter and thinner. In recent years, electrodeposited micron-sized nickel-iron alloy foil has become a research hotspot for battery current collector materials due to its lightness, excellent physical properties, and good conductivity. Alloy foil prepared using electrodeposition technology has the advantages of isotropic physical properties, easily controllable thickness, and low production costs. Research on electrodeposited alloy foil has a very broad application prospect.

[0003] Currently, how to improve the tensile strength and elongation of nickel-iron-copper alloy foil has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0004] Based on this, the present application provides a preparation method and application of nickel-iron-copper alloy foil to solve the technical problem of how to improve the tensile strength and elongation of nickel-iron-copper alloy foil in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a method for preparing a nickel-iron-copper alloy foil, comprising:

[0006] Provided is an electrolyte for preparing a nickel-iron-copper alloy foil, wherein the electrolyte for preparing the nickel-iron-copper alloy foil comprises 100-200 parts by mass of nickel sulfate hexahydrate, 10-60 parts by mass of ferrous sulfate pentahydrate, 10-60 parts by mass of copper sulfate pentahydrate, 0.2-0.5 parts by mass of hydrogen chloride, 40-100 parts by mass of boric acid, 2-10 parts by mass of saccharin sodium, and 0.2-0.5 parts by mass of a wetting agent;

[0007] supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller;

[0008] A voltage is applied between the anode plate and the cathode roller to electrolyze the electrolyte for preparing the nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0009] Optionally, the current density applied between the anode plate and the cathode roller during electrolysis is 8 to 16 A / dm 2 .

[0010] Optionally, the pH value of the electrolyte used to prepare the nickel-iron-copper alloy foil during electrolysis is 2-5.

[0011] Optionally, the temperature of the electrolyte for preparing the nickel-iron-copper alloy foil during electrolysis is 50° C. to 60° C.

[0012] Optionally, the wetting agent is sodium lauryl sulfate.

[0013] Optionally, the average roughness of the cathode roller is 0.13-0.14 μm.

[0014] Optionally, the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0015] Optionally, the cathode roller is a titanium roller, and the anode plate is an iridium-plated titanium plate.

[0016] In a second aspect, an embodiment of the present application provides a nickel-iron-copper alloy foil, which is obtained according to the above-mentioned method for preparing the nickel-iron-copper alloy foil.

[0017] In a third aspect, an embodiment of the present application provides a negative electrode material for a lithium-ion battery, comprising the above-mentioned nickel-iron-copper alloy foil.

[0018] The preparation method and application of the nickel-iron-copper alloy foil of the embodiment of the present application include: providing an electrolyte for preparing the nickel-iron-copper alloy foil, wherein the electrolyte for preparing the nickel-iron-copper alloy foil includes 100-200 parts by mass of nickel sulfate hexahydrate, 10-60 parts by mass of ferrous sulfate pentahydrate, 10-60 parts by mass of copper sulfate pentahydrate, 0.2-0.5 parts by mass of hydrogen chloride, 40-100 parts by mass of boric acid, 2-10 parts by mass of saccharin sodium and 0.2-0.5 parts by mass of sodium saccharin. parts of wetting agent; supplying the electrolyte for preparing the nickel-iron-copper alloy foil between the anode plate and the cathode roller; applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing the nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller; and controlling the chloride ion concentration in the electrolyte within a relatively low range and controlling the addition ratio of the acid-base regulator, the brightener and the wetting agent to improve the tensile strength and elongation of the nickel-iron-copper alloy foil. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present application, the present application is described in more detail below. Preferred embodiments of the present application are provided in the detailed description. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0020] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0022] In the prior art, the chloride ion concentration in the electrolyte of alloy foil (e.g., nickel-iron alloy foil, copper-nickel alloy foil, or nickel-iron-copper alloy foil) is generally greater than 10 g / L, for example, the chloride ion concentration is generally 12 g / L to 15 g / L. It is believed that maintaining the chloride ion concentration within this range can improve electrodeposition efficiency and thus the quality of the resulting alloy foil.

[0023] An embodiment of the present application provides a method for preparing a nickel-iron-copper alloy foil, comprising the following steps S11 to S13:

[0024] Step S11: providing an electrolyte for preparing a nickel-iron-copper alloy foil, wherein the electrolyte for preparing a nickel-iron-copper alloy foil comprises 100-200 parts by mass of nickel sulfate hexahydrate, 10-60 parts by mass of ferrous sulfate pentahydrate, 10-60 parts by mass of copper sulfate pentahydrate, 0.2-0.5 parts by mass of hydrogen chloride, 40-100 parts by mass of boric acid, 2-10 parts by mass of saccharin sodium, and 0.2-0.5 parts by mass of a wetting agent;

[0025] Step S12: supplying the electrolyte for preparing the nickel-iron-copper alloy foil between the anode plate and the cathode roller;

[0026] Step S13: applying a voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing the nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0027] The concentration of chloride ions in the electrolyte used to prepare the nickel-iron-copper alloy foil in step S11 is less than 0.5 g / L.

[0028] Among them, nickel sulfate hexahydrate (NiSO4·6H20) is used as a metal nickel salt to provide metal nickel ions during the electrolysis process; ferrous sulfate pentahydrate (FeSO4·5H20) is used as a metal iron salt to provide metal ferrous ions during the electrolysis process; and copper sulfate pentahydrate (CuSO4·5H20) is used as a metal copper salt to provide metal copper ions during the electrolysis process.

[0029] Among them, hydrogen chloride is used to provide chloride ions in the electrolysis process. Chloride ions can reduce the valence state of metal active points to alleviate the positive precipitation. Specifically, chloride ions, as anode activators, can form complexes with metal ions FeCl + 、CuCl + and NiCl + , causing the equilibrium potential of the metal ions (ferrous, copper, and nickel ions) to shift negatively, simultaneously eliminating stress in the nickel-iron-copper alloy foil formed by electrolytic deposition and facilitating anodic dissolution. In this embodiment, the significant reduction in chloride ion concentration did not degrade the quality of the electrolytically produced nickel-iron-copper alloy foil; instead, it helped improve its tensile strength and elongation.

[0030] Among them, boric acid is used as an acid-base regulator to control the electrolytic acidic environment during the electrolysis process. Specifically, boric acid is a monobasic weak acid that dissociates in water to generate hydrogen ions (H + ) and borate ions (BO3 3- ), thereby adjusting the pH value of the electrolyte during the electrolysis process.

[0031] Among them, saccharin sodium acts as a brightener, which is adsorbed on the surface of the cathode (i.e., nickel-iron-copper alloy foil), inhibiting the rapid and disordered deposition of metal ions and promoting the uniform formation of crystal nuclei, thereby refining the coating grains and making the surface denser and smoother. Specifically, the functional groups such as sulfonamide and carboxyl groups in the saccharin sodium molecule can be adsorbed on the surface of the alloy foil to form a uniform film. This film can improve the microstructure of the alloy foil surface, reduce surface defects, and thus improve the brightness of the alloy foil; in the electrolysis process, saccharin sodium can also inhibit the metal ions (Fe 2+ 、Cu 2+ and Ni 2+ ) to prevent the formation of dendrites, thereby improving the brightness of the alloy foil; and, sodium saccharin can refine the grains on the surface of the platinum foil, making the alloy foil denser and smoother. By refining the grains, it can not only improve the brightness of the alloy foil surface, but also enhance the hardness and wear resistance of the alloy foil.

[0032] Among them, the wetting agent can significantly reduce the surface tension of the electrolyte, making it easier to wet the surface of the cathode (i.e., nickel-iron-copper alloy foil), that is, reduce the surface tension of the nickel-iron-copper alloy foil, so that the liquid can spread on the surface of the nickel-iron-copper alloy foil to wet the nickel-iron-copper alloy foil.

[0033] Exemplarily, the wetting agent is sodium dodecyl sulfate. Sodium dodecyl sulfate is a surfactant whose molecular structure consists of a hydrophobic long carbon chain (dodecyl) and a hydrophilic sulfate ion. The above structure enables it to significantly reduce the surface tension of the electrolyte, making it easier for the electrolyte to spread on the cathode surface (alloy foil), thereby reducing the surface tension and improving the wettability of the electrolyte on the cathode surface (alloy foil), ensuring that the electrolyte evenly covers the surface, thereby improving the deposition efficiency and uniformity of copper ions and nickel ions.

[0034] In this embodiment, the tensile strength and elongation of the nickel-iron-copper alloy foil are improved by controlling the chloride ion concentration in the electrolyte within a relatively low range and controlling the addition ratio of the acid-base regulator, brightener, and wetting agent.

[0035] For example, in the electrolyte used to prepare nickel-iron-copper alloy foil, the concentration of metal nickel salt is 100-200 g / L, the concentration of metal iron salt is 10-60 g / L, the concentration of metal copper salt is 10-60 g / L, the concentration of hydrogen chloride is 0.2-0.5 g / L, the concentration of acid-base regulator is 40-100 g / L, the concentration of brightener is 2-10 g / L, and the concentration of wetting agent is 0.2-0.5 g / L.

[0036] As an embodiment, the current density applied between the anode plate and the cathode roller during electrolysis is 8 to 16 A / dm 2 For example, the current density applied between the anode plate and the cathode roller during electrolysis is 8A / dm 2 、10A / dm 2 , 12A / dm 2 、14A / dm 2 , or 16A / dm 2 .

[0037] In this embodiment, electrolysis is performed at a relatively low current density, resulting in relatively slow deposition. This slow deposition allows for full grain growth, resulting in a uniform and dense structure. Furthermore, the use of a relatively low current density, combined with controlled brightener dosage, allows for full grain growth, resulting in a uniform and dense structure, while mitigating the increased surface roughness of the gold foil caused by low current density, ultimately maintaining the alloy foil's surface roughness within a reasonable range.

[0038] As an embodiment, the pH value of the electrolyte used to prepare the nickel-iron-copper alloy foil during electrolysis is 2 to 5. Exemplarily, the pH value of the electrolyte used to prepare the nickel-iron-copper alloy foil during electrolysis is 2, 3, 4 or 5.

[0039] In this embodiment, the use of the acid-base regulator can keep the pH value of the electrolyte within the above range during the electrolysis process.

[0040] As an embodiment, the temperature of the electrolyte used to prepare the nickel-iron-copper alloy foil during electrolysis is 50° C. to 60° C. For example, the electrolysis temperature may be 50° C., 52° C., 55° C., 58° C., or 60° C.

[0041] In this embodiment, controlling the electrolysis temperature within the above range is beneficial to increasing the density of the alloy foil coating while ensuring the deposition rate.

[0042] As an embodiment, the average roughness of the cathode roller is 0.13-0.14 μm.

[0043] As an embodiment, the rotation speed of the cathode roller during electrolysis is 7.5 to 8.4 m / min.

[0044] As an embodiment, the cathode roller is a titanium roller, and the anode plate is an iridium-plated titanium plate.

[0045] An embodiment of the present application provides a nickel-iron-copper alloy foil, which is obtained according to the above-mentioned method for preparing the nickel-iron-copper alloy foil.

[0046] An embodiment of the present application provides a negative electrode material for a lithium-ion battery, comprising the above-mentioned nickel-iron-copper alloy foil.

[0047] Example 1

[0048] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 1:

[0049] Table 1 Content of each component in Example 1

[0050]

[0051] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0052] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0053] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0054] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 1.

[0055] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0056] The current density applied between the anode plate and the cathode roller during electrolysis is 8A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0057] Example 2

[0058] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 2:

[0059] Table 2 Content of each component in Example 2

[0060]

[0061] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0062] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0063] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0064] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 2.

[0065] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0066] The current density applied between the anode plate and the cathode roller during electrolysis is 8A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0067] Example 3

[0068] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 3:

[0069] Table 3 Content of each component in Example 3

[0070]

[0071] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0072] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0073] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0074] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 3.

[0075] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0076] The current density applied between the anode plate and the cathode roller during electrolysis is 10A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 2, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0077] Example 4

[0078] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 4:

[0079] Table 4 Content of each component in Example 4

[0080]

[0081] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0082] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0083] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0084] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 4.

[0085] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0086] The current density applied between the anode plate and the cathode roller during electrolysis is 10A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 4, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0087] Example 5

[0088] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 5:

[0089] Table 5 Content of each component in Example 5

[0090]

[0091] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0092] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0093] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0094] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 5.

[0095] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0096] The current density applied between the anode plate and the cathode roller during electrolysis is 12A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 2, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0097] Example 6

[0098] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 6:

[0099] Table 6 Content of each component in Example 6

[0100]

[0101] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0102] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0103] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0104] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 6.

[0105] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0106] The current density applied between the anode plate and the cathode roller during electrolysis is 12A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 5, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0107] Example 7

[0108] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 7:

[0109] Table 7 Content of each component in Example 7

[0110]

[0111] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0112] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0113] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0114] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 7.

[0115] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0116] The current density applied between the anode plate and the cathode roller during electrolysis is 14A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0117] Example 8

[0118] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 8:

[0119] Table 8 Content of each component in Example 8

[0120]

[0121] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0122] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0123] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0124] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 8.

[0125] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0126] The current density applied between the anode plate and the cathode roller during electrolysis is 14A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0127] Example 9

[0128] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is as shown in Table 9:

[0129] Table 9 Content of each component in Example 9

[0130]

[0131] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0132] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0133] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0134] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 9.

[0135] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0136] The current density applied between the anode plate and the cathode roller during electrolysis is 16A / dm 2The electrolysis temperature is 55°C, the pH value during electrolysis is 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0137] Example 10

[0138] This embodiment provides a method for preparing a nickel-iron-copper alloy foil, wherein the electrolyte used to prepare the nickel-iron-copper alloy foil is shown in Table 10:

[0139] Table 10 Content of each component in Example 10

[0140]

[0141] The electrolyte used to prepare the nickel-iron-copper alloy foil also includes water.

[0142] The nickel-iron-copper alloy foil is prepared by using the electrolyte for preparing the nickel-iron-copper alloy foil, which specifically includes the following steps:

[0143] Step 1: providing the above-mentioned electrolyte for preparing nickel-iron-copper alloy foil.

[0144] The components of the electrolyte used to prepare the nickel-iron-copper alloy foil are shown in Table 10.

[0145] Step 2: supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller, and applying voltage between the anode plate and the cathode roller to electrolyze the electrolyte for preparing nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

[0146] The current density applied between the anode plate and the cathode roller during electrolysis is 16A / dm 2 The electrolysis temperature is 55°C, the pH value during electrolysis is 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0147] The thickness of the nickel-iron-copper alloy foil prepared in Examples 1 to 10 is 6 μm. The experimental results of Examples 1 to 8 are shown in Table 11.

[0148] Table 11 Experimental results of Examples 1 to 8

[0149]

[0150]

[0151] As shown in Table 11, the tensile strength of the nickel-iron alloy foil can reach above 544 MPa; and the elongation of the nickel-iron alloy foil can reach above 22%.

[0152] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0153] The above embodiments merely represent preferred embodiments of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for preparing a nickel-iron-copper alloy foil, characterized in that: include: Provided is an electrolyte for preparing a nickel-iron-copper alloy foil, wherein the electrolyte for preparing the nickel-iron-copper alloy foil comprises 100-200 parts by mass of nickel sulfate hexahydrate, 10-60 parts by mass of ferrous sulfate pentahydrate, 10-60 parts by mass of copper sulfate pentahydrate, 0.2-0.5 parts by mass of hydrogen chloride, 40-100 parts by mass of boric acid, 2-10 parts by mass of saccharin sodium, and 0.2-0.5 parts by mass of a wetting agent; supplying the electrolyte for preparing nickel-iron-copper alloy foil between the anode plate and the cathode roller; A voltage is applied between the anode plate and the cathode roller to electrolyze the electrolyte for preparing the nickel-iron-copper alloy foil to form the nickel-iron-copper alloy foil on the surface of the cathode roller.

2. The method for preparing the nickel-iron-copper alloy foil according to claim 1, wherein The current density applied between the anode plate and the cathode roller during electrolysis is 8 to 16 A / dm 2 .

3. The method for preparing the nickel-iron-copper alloy foil according to claim 1, wherein During electrolysis, the pH value of the electrolyte used to prepare the nickel-iron-copper alloy foil is 2-5.

4. The method for preparing the nickel-iron-copper alloy foil according to claim 1, wherein The temperature of the electrolyte for preparing the nickel-iron-copper alloy foil during electrolysis is 50° C. to 60° C.

5. The method for preparing the nickel-iron-copper alloy foil according to claim 1, wherein The wetting agent is sodium lauryl sulfate.

6. The method for preparing the nickel-iron-copper alloy foil according to claim 1, wherein: The average roughness of the cathode roller is 0.13-0.14 μm.

7. The method for preparing the nickel-iron-copper alloy foil according to claim 1, wherein: During electrolysis, the rotation speed of the cathode roller is 7.5-8.4 m / min.

8. The method for preparing the nickel-iron-copper alloy foil according to claim 1, wherein: The cathode roller is a titanium roller, and the anode plate is an iridium-plated titanium plate.

9. A nickel-iron-copper alloy foil, characterized in that The nickel-iron-copper alloy foil is obtained according to the preparation method of the nickel-iron-copper alloy foil according to any one of claims 1 to 8.

10. A negative electrode material for a lithium ion battery, characterized in that: The invention comprises the nickel-iron-copper alloy foil as described in claim 9.

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