Preparation of Double-sided Photoelectrolytic Copper Foil for Special Lithium Batteries

Abstract

The invention relates to the preparation of a double-sided photoelectrolytic copper foil for a special lithium battery, which comprises the following steps: preparing solution of a first additive, solution of a second additive, and copper sulfate electrolyte, wherein the copper ion concentration in the copper sulfate electrolyte is 70 to 100g / L, the sulfuric acid concentration is 100 to 170g / L and the chlorine ion concentration is 0.01 to 0.04g / L, and the temperature of the copper sulfate electrolyte is 40 to 60 DEG C; adding 60 to 200 milliliters of solution of the first additive and 35 to 100 milliliters of solution of the second additive into each cubic meter of electrolyte each hour, wherein the electrolyte formed by uniformly stirring enters an electrolytic cell and the electrolysis current density of the electrolyte in the electrolytic cell is 5,000 to 6,000A / m<2>; and after electrochemical reactions are accomplished, obtaining the double-sided electrolytic copper foil for a photic lithium battery. The preparation of the double-sided photoelectrolytic copper foil for the special lithium battery has the advantages that: the unit area weight of the prepared photoelectrolytic copper foil is 87 to 89g / m<2>, the tensile strength is more than 45Kgf / m<2>, the elongation rate is more than 5 percent, the surface roughness R2 is less than 1.5 mu m, and the uniform thickness of thecopper foil is 8.6 to 9.3 mu m according to actual measurement.

Description

technical field

[0001] The invention relates to a method for manufacturing copper foil, in particular to the preparation of a double-sided photoelectrolytic copper foil for a special lithium battery. Background technique

[0002] Lithium-ion secondary battery is a green and clean energy that is vigorously developed and advocated in the world. With the development of technology, its production and usage are increasing day by day. Double-sided light and ultra-thin electrolytic copper foil is the key material for the negative electrode production of high-quality lithium-ion secondary batteries. Its quality directly affects the production process and comprehensive performance of lithium batteries. Key index parameters include elongation, tensile strength, Quality per unit area and surface roughness and appearance quality. Only a few domestic manufacturers have production capacity, but their output is small and the production process is extremely unstable. The production process...

Examples

no. 1 approach

[0018] see figure 1 , the preparation of the special double-sided photoelectrolytic copper foil for lithium batteries provided by the first embodiment of the present invention, that is, the manufacturing method of ultra-thin double-sided photoelectrolytic copper foil for lithium-ion secondary batteries, which includes the following steps.

[0019] The prepared first additive solution 100 and second additive solution 200 are injected into the liquid inlet pipe 10 of the electrolytic cell 300 through a metering pump (not shown) at a rate of 2:1 at a flow rate of 7.5 L / h. During the process, fully mix with the electrolyte in the electrolyte preparation system 400 and then enter the electrolytic cell 300;

[0020] The flow rate of the electrolyte is 55-65 cubic meters per hour. After the mixed solution of the first additive solution 100, the second additive solution 200 and the electrolyte enters the electrolytic cell 300, the flow rate is 5000-6000A / m 2 (6000A / m in this embodime...

Embodiment 2

[0027] Referring to the production method of Example 1, the copper foil product was prepared. The temperature of the electrolyte was 50-55°C, and the concentrations of the components were: copper ion concentration 85g / L, sulfuric acid concentration 170g / L, and chloride ion concentration 0.03g / L, the flow rate of the electrolyte is 60-70 cubic meters per hour; the first additive solution and the second additive solution are added at a ratio of 7 liters per hour in a ratio of 2:1. The first additive solution is made according to the raw materials of following ratio: 2.0g / L of sodium 3-mercapto 1-propanesulfonate, 0.020g / L of polyethylene glycol, 0.0020g / L of ethylene thiourea; Raw material ratio is: gelatin 2.5g / L, hydroxyethyl cellulose 0.25g / L.

[0028] The rough surface of the electrolytic copper foil prepared in this example is mirror-like like the smooth surface, and the crystal grains are in a layered structure. The thickness of the copper foil is 8.9-9.1um. After testing...

Embodiment 3

[0030] Referring to the production method of Example 1, the copper foil product was prepared. The temperature of the electrolyte was 50-55°C, and the concentrations of the components were: copper ion concentration 75g / L, sulfuric acid concentration 165g / L, and chloride ion concentration 0.03g / L, the electrolyte flow rate is 60-70 cubic meters per hour; the first additive solution and the second additive solution are added at a ratio of 7.5 liters per hour in a ratio of 2:1. The first additive solution is made by the raw material of following ratio: 3-mercapto 1-propanesulfonate sodium 2.5g / L, polyethylene glycol 0.030g / L, ethylene thiourea 0.0025g / L; The second additive solution Raw material ratio is: gelatin 2.0g / L, hydroxyethyl cellulose 0.20g / L.

[0031] The rough surface of the electrolytic copper foil prepared in this example is mirror-like like the smooth surface, and the crystal grains are in a layered structure. The thickness of the copper foil is 9.0-9.2um. After tes...

technical field

[0001] The invention relates to a method for manufacturing copper foil, in particular to the preparation of a double-sided photoelectrolytic copper foil for a special lithium battery. Background technique

[0002] Lithium-ion secondary battery is a green and clean energy that is vigorously developed and advocated in the world. With the development of technology, its production and usage are increasing day by day. Double-sided light and ultra-thin electrolytic copper foil is the key material for the negative electrode production of high-quality lithium-ion secondary batteries. Its quality directly affects the production process and comprehensive performance of lithium batteries. Key index parameters include elongation, tensile strength, Quality per unit area and surface roughness and appearance quality. Only a few domestic manufacturers have production capacity, but their output is small and the production process is extremely unstable. The production process...

Examples

no. 1 approach

[0018] see figure 1 , the preparation of the special double-sided photoelectrolytic copper foil for lithium batteries provided by the first embodiment of the present invention, that is, the manufacturing method of ultra-thin double-sided photoelectrolytic copper foil for lithium-ion secondary batteries, which includes the following steps.

[0019] The prepared first additive solution 100 and second additive solution 200 are injected into the liquid inlet pipe 10 of the electrolytic cell 300 through a metering pump (not shown) at a rate of 2:1 at a flow rate of 7.5 L / h. During the process, fully mix with the electrolyte in the electrolyte preparation system 400 and then enter the electrolytic cell 300;

[0020] The flow rate of the electrolyte is 55-65 cubic meters per hour. After the mixed solution of the first additive solution 100, the second additive solution 200 and the electrolyte enters the electrolytic cell 300, the flow rate is 5000-6000A / m 2 (6000A / m in this embodime...

Embodiment 2

[0027] Referring to the production method of Example 1, the copper foil product was prepared. The temperature of the electrolyte was 50-55°C, and the concentrations of the components were: copper ion concentration 85g / L, sulfuric acid concentration 170g / L, and chloride ion concentration 0.03g / L, the flow rate of the electrolyte is 60-70 cubic meters per hour; the first additive solution and the second additive solution are added at a ratio of 7 liters per hour in a ratio of 2:1. The first additive solution is made according to the raw materials of following ratio: 2.0g / L of sodium 3-mercapto 1-propanesulfonate, 0.020g / L of polyethylene glycol, 0.0020g / L of ethylene thiourea; Raw material ratio is: gelatin 2.5g / L, hydroxyethyl cellulose 0.25g / L.

[0028] The rough surface of the electrolytic copper foil prepared in this example is mirror-like like the smooth surface, and the crystal grains are in a layered structure. The thickness of the copper foil is 8.9-9.1um. After testing...

Embodiment 3

[0030] Referring to the production method of Example 1, the copper foil product was prepared. The temperature of the electrolyte was 50-55°C, and the concentrations of the components were: copper ion concentration 75g / L, sulfuric acid concentration 165g / L, and chloride ion concentration 0.03g / L, the electrolyte flow rate is 60-70 cubic meters per hour; the first additive solution and the second additive solution are added at a ratio of 7.5 liters per hour in a ratio of 2:1. The first additive solution is made by the raw material of following ratio: 3-mercapto 1-propanesulfonate sodium 2.5g / L, polyethylene glycol 0.030g / L, ethylene thiourea 0.0025g / L; The second additive solution Raw material ratio is: gelatin 2.0g / L, hydroxyethyl cellulose 0.20g / L.

[0031] The rough surface of the electrolytic copper foil prepared in this example is mirror-like like the smooth surface, and the crystal grains are in a layered structure. The thickness of the copper foil is 9.0-9.2um. After tes...

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