Nano-electrolytic copper foil suitable to lithium ion cell and preparation method
A kind of electrolytic copper foil, nanotechnology, applied in the direction of electrode carrier/current collector, process efficiency improvement, photography process, etc., can solve the problems of low tensile strength and elongation, cannot meet the high strength and low thickness of copper foil, and achieve The effect of uniform and stable mechanical properties
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Embodiment 1
[0021] Prepared by direct current electrodeposition process, the concentration of copper ions in the electrolyte is 50g / l, the concentration of sulfuric acid is 100g / l, the electrolysis is carried out at 35°C, the flow rate of the electrolyte is 1.0m / s, and the current density is 0.6A / cm 2 , the mixed organic additive unit composition added in the electrolyte is as follows:
[0022] Thiourea 3mg / l
[0023] Bone glue 3mg / l
[0024] Chloride 0.1mg / l
[0025] Congo red 0.005mg / l
[0026] The prepared copper foil is tested by a material mechanical property testing machine, and its tensile strength is 500 MPa, its elongation is 5.0%, and the roughness of the rough surface is 0.40 μm. The average grain size is 146nm, and its scanning electron microscope picture is shown in Figure 1. There is no preferred orientation on the surface of the copper foil.
Embodiment 2
[0028] The preparation method includes an electrolyte solution with a copper concentration of 90g / l and a sulfuric acid concentration of 250g / l. Electrolysis is carried out at 55°C, the flow rate of the electrolyte solution is 1.0m / s, and the current density is 1.0A / cm 2 , the organic additive unit composition added in the electrolyte is as follows:
[0029] Thiourea 12mg / l
[0030] Bone glue 12mg / l
[0031] Chloride 5.0mg / l
[0032] Congo red 0.02mg / l
[0033] The prepared copper foil is tested by a material mechanical property testing machine, and its tensile strength is 645 MPa, its elongation is 6.2%, and the roughness of the rough surface is 0.38 μm. The average grain size is 120nm, and its scanning electron microscope picture is shown in Figure 2. There is no preferred orientation on the surface of the copper foil.
Embodiment 3
[0035] The preparation method includes an electrolyte solution with a copper concentration of 80g / l and a sulfuric acid concentration of 200g / l, which is electrolyzed at 50°C, the flow rate of the electrolyte is 1.0m / s, and the current density is 1.0A / cm 2 , the organic additive unit composition added in the electrolyte is as follows:
[0036] Thiourea 9mg / l
[0037] Bone glue 3mg / l
[0038] Chloride 1.0mg / l
[0039]Congo red 0.01mg / l
[0040] The prepared copper foil is tested by a material mechanical property testing machine, and its tensile strength is 695 MPa, its elongation is 7.9%, and the roughness of the rough surface is 0.38 μm. The average crystal grain is 100nm, and its scanning electron microscope picture is shown in Figure 3. There is no preferred orientation on the surface of the copper foil.
[0041] According to the present invention, the nano-electrolytic copper foil for high-performance lithium batteries wit...
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