Electrolyte composition for preparing copper-nickel alloy foil and application

Abstract

The invention relates to the technical field of alloy foil manufacturing, in particular to an electrolyte composition for preparing a copper-nickel alloy foil and application. Comprising 100-200 parts by mass of a first metal nickel salt, 2-15 parts by mass of a second metal nickel salt, 10-60 parts by mass of a metal copper salt, 40-100 parts by mass of a metal complexing agent, 40-100 parts by mass of an acid-base regulator, 2-10 parts by mass of a brightener and 0.1-0.2 part by mass of a wetting agent, and the second metal nickel salt is a chlorate; by controlling the proportion of the chloride ion concentration, the nickel ion concentration and the copper ion concentration in the electrolyte and controlling the adding proportion of the metal complexing agent, the acid-base regulator, the brightener and the wetting agent, the tensile strength and the ductility of the copper-nickel alloy foil can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of alloy foil manufacturing, and in particular to an electrolyte composition for preparing copper-nickel alloy foil and its application. Background Art

[0002] Copper-nickel 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, many high-tech fields require materials that are lighter and thinner. In recent years, electrodeposited micron-sized copper-nickel alloy foil has become a research hotspot for battery current collector materials due to its lightness, excellent physical properties, and good conductivity. Copper-nickel alloy foil prepared using electrodeposition technology has the advantages of isotropic physical properties, easily controllable thickness, and low production costs. Research on electrodeposited copper-nickel alloy foil has a very broad application prospect.

[0003] Currently, how to improve the tensile strength and elongation of copper-nickel 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 an electrolyte composition for preparing copper-nickel alloy foil and its application, so as to solve the technical problem of how to improve the tensile strength and elongation of copper-nickel alloy foil in the prior art.

[0005] In a first aspect, an embodiment of the present application provides an electrolyte composition for preparing a copper-nickel alloy foil, comprising 100 to 200 parts by mass of a first metal nickel salt, 2 to 15 parts by mass of a second metal nickel salt, 10 to 60 parts by mass of a metal copper salt, 40 to 100 parts by mass of a metal chelating agent, 40 to 100 parts by mass of an acid-base regulator, 2 to 10 parts by mass of a brightener, and 0.1 to 0.2 parts by mass of a wetting agent, wherein the second metal nickel salt is a chloride salt.

[0006] Optionally, the electrolyte composition for preparing the copper-nickel alloy foil further comprises a solvent; and in the electrolyte composition for preparing the copper-nickel alloy foil, the concentration of chloride ions is less than 5 g / L.

[0007] Optionally, the first metal nickel salt is nickel sulfate hexahydrate, and the second metal nickel salt is nickel chloride hexahydrate.

[0008] Optionally, the metal copper salt is copper sulfate pentahydrate.

[0009] Optionally, the metal complexing agent is sodium citrate.

[0010] Optionally, the acid-base regulator is boric acid.

[0011] Optionally, the brightening agent is sodium saccharin.

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

[0013] In a second aspect, an embodiment of the present application provides a copper-nickel alloy foil, which is obtained by electrolyzing the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil.

[0014] In a third aspect, an embodiment of the present application provides a negative electrode material for a lithium-ion battery, comprising the above-mentioned copper-nickel alloy foil.

[0015] The electrolyte composition and application for preparing copper-nickel alloy foil in the embodiment of the present application include 100-200 parts by mass of a first metal nickel salt, 2-15 parts by mass of a second metal nickel salt, 10-60 parts by mass of a metal copper salt, 40-100 parts by mass of a metal chelating agent, 40-100 parts by mass of an acid-base regulator, 2-10 parts by mass of a brightener, and 0.1-0.2 parts by mass of a wetting agent, wherein the second metal nickel salt is a chloride salt; by controlling the ratio of the chloride ion concentration, the nickel ion concentration, and the copper ion concentration in the electrolyte, and controlling the addition ratio of the metal chelating agent, the acid-base regulator, the brightener, and the wetting agent, it is beneficial to improve the tensile strength and elongation of the copper-nickel alloy foil. DETAILED DESCRIPTION

[0016] 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.

[0017] 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.

[0018] 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.

[0019] One embodiment of the present application provides an electrolyte composition for preparing a copper-nickel alloy foil, comprising 100 to 200 parts by mass of a first metal nickel salt, 2 to 15 parts by mass of a second metal nickel salt, 10 to 60 parts by mass of a metal copper salt, 40 to 100 parts by mass of a metal chelating agent, 40 to 100 parts by mass of an acid-base regulator, 2 to 10 parts by mass of a brightener, and 0.1 to 0.2 parts by mass of a wetting agent, wherein the second metal nickel salt is a chloride salt.

[0020] The first metal nickel salt and the second metal nickel salt are used to provide metal nickel ions during the electrolysis process, and the metal copper salt is used to provide metal copper ions during the electrolysis process; the second metal nickel salt is used to provide chloride ions during the electrolysis process. Chloride ions can reduce the valence state of metal active points to alleviate the electrochemical deposition. Specifically, chloride ions, as anode activators, can form a complex CuCl with metal ions. + and NiCl + , causing the equilibrium potential of metal ions (copper ions and nickel ions) to move negatively, while eliminating the stress of the copper-nickel alloy foil formed by electrolytic deposition and helping the anode to dissolve; metal complexes are used to complex with metal ions during the electrolysis process to allow nickel ions and copper ions to be electrodeposited; acid-base regulators are used to control the electrolytic acidic environment during the electrolysis process; brighteners are adsorbed on the surface of the cathode (i.e., the copper-nickel 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; wetting agents can significantly reduce the surface tension of the electrolyte, making it easier to wet the surface of the cathode (i.e., the copper-nickel alloy foil), that is, reducing the surface tension of the copper-nickel alloy foil, so that the liquid can spread on the surface of the copper-nickel alloy foil to wet the copper-nickel alloy foil.

[0021] In this embodiment, by controlling the ratio of chloride ion concentration, nickel ion concentration and copper ion concentration in the electrolyte, and controlling the addition ratio of metal chelating agent, acid-base regulator, brightener and wetting agent, it is beneficial to improve the tensile strength and elongation of copper-nickel alloy foil.

[0022] Illustratively, the electrolyte composition for preparing copper-nickel alloy foil is mixed with a solvent to obtain an electrolyte for preparing copper-nickel alloy foil. In the obtained electrolyte for preparing copper-nickel alloy foil, the concentration of the first metal nickel salt is 100-200 g / L, the concentration of the second metal nickel salt is 2-15 g / L, the concentration of the metal copper salt is 10-60 g / L, the concentration of the metal complexing agent is 40-100 g / L, the concentration of the acid-base regulator is 40-100 g / L, the concentration of the brightener is 2-10 g / L, and the concentration of the wetting agent is 0.1-0.2 g / L.

[0023] As an embodiment, the electrolyte composition for preparing the copper-nickel alloy foil further comprises a solvent, and the concentration of chloride ions in the electrolyte composition for preparing the copper-nickel alloy foil is less than 5 g / L. For example, the solvent may be water.

[0024] In the prior art, the chloride ion concentration in the electrolyte of copper-nickel 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 the electrodeposition efficiency and thus the quality of the resulting copper-nickel alloy foil.

[0025] According to the experimental results of this embodiment, controlling the chloride ion concentration in the electrolyte within a relatively low range (less than 5.0 g / L) does not reduce the tensile strength and elongation of the copper-nickel alloy foil, while reducing the corrosiveness of the electrolyte, which is beneficial to reducing the difficulty of synthesizing the copper-nickel alloy foil.

[0026] In some embodiments, the first metal nickel salt is nickel sulfate hexahydrate (NiSO4·6H20), and the second metal nickel salt is nickel chloride hexahydrate (NiCl2·6H20).

[0027] In this embodiment, in the electrolyte solution for preparing the copper-nickel alloy foil obtained by mixing the above composition with a solvent, the concentration of chloride ions is 0.5964 g / L to 4.473 g / L.

[0028] According to the experimental results of this embodiment, controlling the chloride ion concentration in the electrolyte within a relatively low range (0.5964 g / L to 4.473 g / L) does not reduce the tensile strength and elongation of the copper-nickel alloy foil, while reducing the corrosiveness of the electrolyte, which is beneficial to reducing the difficulty of synthesizing the copper-nickel alloy foil.

[0029] As an embodiment, the metal copper salt is copper sulfate pentahydrate (CuSO4·5H20).

[0030] As an embodiment, the metal complexing agent is sodium citrate. In this embodiment, the molecular structure of sodium citrate contains multiple carboxyl groups (-COO - ) and hydroxyl (-OH) functional groups, which can react with metal ions to form stable complexes. For example, the oxygen atoms in the carboxyl group and the oxygen atoms in the hydroxyl group can act as coordination atoms to react with metal ions (Cu 2+ and Ni 2+ ) form a coordination bond.

[0031] As an embodiment, the acid-base regulator is boric acid. In this embodiment, 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.

[0032] As an embodiment, the brightener is sodium saccharin. In this embodiment, the functional groups such as sulfonamide and carboxyl groups in the sodium saccharin 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; during the electrolysis process, sodium saccharin can also inhibit the metal ion (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.

[0033] As an embodiment, the wetting agent is sodium lauryl sulfate or polyethylene glycol.

[0034] In this embodiment, 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.

[0035] An embodiment of the present application provides a copper-nickel alloy foil, which is obtained by electrolyzing the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil.

[0036] First, an electrolyte composition for preparing a copper-nickel alloy foil is prepared, including a solvent, 100 to 200 parts by mass of a first metal nickel salt, 2 to 15 parts by mass of a second metal nickel salt, 10 to 60 parts by mass of a metal copper salt, 40 to 100 parts by mass of a metal complexing agent, 40 to 100 parts by mass of an acid-base regulator, 2 to 10 parts by mass of a brightener, and 0.1 to 0.2 parts by mass of a wetting agent.

[0037] Among them, in the electrolyte composition used to prepare copper-nickel alloy foil, the concentration of the first metal nickel salt is 100-200 g / L, the concentration of the second metal nickel salt is 2-15 g / L, the concentration of the metal copper salt is 10-60 g / L, the concentration of the metal complexing agent is 40-100 g / L, the concentration of the acid-base regulator is 40-100 g / L, the concentration of the brightener is 2-10 g / L, and the concentration of the wetting agent is 0.1-0.2 g / L.

[0038] Then, the electrolyte for preparing the copper-nickel alloy foil is supplied between the anode plate and the cathode roller, and a voltage is applied between the anode plate and the cathode roller to electrolyze the electrolyte for preparing the copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0039] During the electrolysis process, nickel ions and ferrous ions in the electrolyte are deposited on the surface of the cathode roller to form a copper-nickel alloy foil. The copper-nickel alloy foil is peeled off from the cathode roller and enters the subsequent processing step.

[0040] As an embodiment, the current density applied between the anode plate and the cathode roller during electrolysis is 8 to 14 A / dm 2 .

[0041] 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.

[0042] As an embodiment, the pH value of the electrolyte used to prepare the copper-nickel alloy foil during electrolysis is 2-5.

[0043] 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.

[0044] As an embodiment, the temperature of the electrolyte used to prepare the copper-nickel alloy foil during electrolysis is 50° C. to 65° C.

[0045] 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.

[0046] As an embodiment, the average roughness of the cathode roller can be 0.12 to 0.17 μm. In this embodiment, controlling the roughness of the cathode roller within the above range is beneficial to the formation of the crystalline structure of the first 0 to 1.5 μm thickness of the electrolytically obtained alloy foil.

[0047] In some embodiments, the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0048] In some embodiments, the cathode roller is a titanium roller and the anode plate is a titanium plate.

[0049] An embodiment of the present application provides a negative electrode material for a lithium-ion battery, comprising the above-mentioned copper-nickel alloy foil.

[0050] Example 1

[0051] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 1:

[0052] Table 1 Content of each component in Example 1

[0053]

[0054] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0055] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0056] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0057] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 1.

[0058] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0059] 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.

[0060] Example 2

[0061] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 2:

[0062] Table 2 Content of each component in Example 2

[0063]

[0064] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0065] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0066] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0067] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 2.

[0068] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0069] 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.

[0070] Example 3

[0071] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 3:

[0072] Table 3 Content of each component in Example 3

[0073]

[0074] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0075] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0076] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0077] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 3.

[0078] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0079] 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 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0080] Example 4

[0081] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 4:

[0082] Table 4 Content of each component in Example 4

[0083]

[0084] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0085] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0086] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0087] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 4.

[0088] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0089] 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 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0090] Example 5

[0091] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 5:

[0092] Table 5 Content of each component in Example 5

[0093]

[0094] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0095] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0096] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0097] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 5.

[0098] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0099] The current density applied between the anode plate and the cathode roller during electrolysis is 12A / 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.

[0100] Example 6

[0101] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 6:

[0102] Table 6 Content of each component in Example 6

[0103]

[0104] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0105] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0106] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0107] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 6.

[0108] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0109] 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 3, and the rotation speed of the cathode roller during electrolysis is 7.5-8.4 m / min.

[0110] Example 7

[0111] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 7:

[0112] Table 7 Content of each component in Example 7

[0113]

[0114] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0115] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0116] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0117] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 7.

[0118] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0119] 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.

[0120] Example 8

[0121] This embodiment provides an electrolyte composition for preparing copper-nickel alloy foil, as shown in Table 8:

[0122] Table 8 Content of each component in Example 8

[0123]

[0124] The electrolyte composition used to prepare the copper-nickel alloy foil also includes water.

[0125] The copper-nickel alloy foil is prepared by using the above-mentioned electrolyte composition for preparing the copper-nickel alloy foil, which specifically includes the following steps:

[0126] Step 1: providing the above-mentioned electrolyte composition for preparing copper-nickel alloy foil.

[0127] The components of the electrolyte used to prepare the copper-nickel alloy foil are shown in Table 8.

[0128] Step 2: supplying the above electrolyte for preparing copper-nickel alloy foil between the anode plate and the cathode roller, applying voltage between the anode plate and the cathode roller, electrolyzing the electrolyte for preparing copper-nickel alloy foil to form the copper-nickel alloy foil on the surface of the cathode roller.

[0129] 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.

[0130] The thickness of the copper-nickel alloy foil prepared in Examples 1 to 8 is 6 μm. The experimental results of Examples 1 to 8 are shown in Table 9.

[0131] Table 9 Experimental results of Examples 1 to 8

[0132]

[0133] As shown in Table 9, the tensile strength of the nickel-iron alloy foil can reach above 1440 MPa; and the elongation of the nickel-iron alloy foil can reach above 3.2%.

[0134] 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.

[0135] 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. An electrolyte composition for preparing a copper-nickel alloy foil, characterized in that: The invention comprises 100 to 200 parts by mass of a first metal nickel salt, 2 to 15 parts by mass of a second metal nickel salt, 10 to 60 parts by mass of a metal copper salt, 40 to 100 parts by mass of a metal complexing agent, 40 to 100 parts by mass of an acid-base regulator, 2 to 10 parts by mass of a brightener and 0.1 to 0.2 parts by mass of a wetting agent, wherein the second metal nickel salt is a chloride salt.

2. The electrolyte composition for preparing copper-nickel alloy foil according to claim 1, characterized in that: The electrolyte composition for preparing the copper-nickel alloy foil further comprises a solvent; in the electrolyte composition for preparing the copper-nickel alloy foil, the concentration of chloride ions is less than 5 g / L.

3. The electrolyte composition for preparing copper-nickel alloy foil according to claim 2, characterized in that: The first metal nickel salt is nickel sulfate hexahydrate, and the second metal nickel salt is nickel chloride hexahydrate.

4. The electrolyte composition for preparing copper-nickel alloy foil according to claim 1, characterized in that: The metal copper salt is copper sulfate pentahydrate.

5. The electrolyte composition for preparing copper-nickel alloy foil according to claim 1, characterized in that: The metal complexing agent is sodium citrate.

6. The electrolyte composition for preparing copper-nickel alloy foil according to claim 1, characterized in that: The acid-base regulator is boric acid.

7. The electrolyte composition for preparing copper-nickel alloy foil according to claim 1, characterized in that: The brightening agent is saccharin sodium.

8. The electrolyte composition for preparing copper-nickel alloy foil according to claim 1, characterized in that: The wetting agent is sodium lauryl sulfate or polyethylene glycol.

9. A copper-nickel alloy foil, characterized in that The copper-nickel alloy foil is obtained by electrolyzing the electrolyte composition for preparing the copper-nickel alloy foil according to any one of claims 1 to 8.

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

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