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

Inactive Publication Date: 2007-06-06
北京中科天华科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tensile strength (350MPa) and elongation (4%) of the electrolytic copper foil prepared under this condition are relatively low, which cannot meet the high strength, high toughness, and low thickness requirements of the copper foil for the current collector material for lithium-ion batteries.

Method used

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  • Nano-electrolytic copper foil suitable to lithium ion cell and preparation method
  • Nano-electrolytic copper foil suitable to lithium ion cell and preparation method
  • Nano-electrolytic copper foil suitable to lithium ion cell and preparation method

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The disclosed electrolytic copper foil is composed of fine Nano equiaxial crystals with average grain less than and equal to 150 nm of no any preferred orientation in X-ray diffraction peak. The Nano electrolytic copper foil is prepared in following conditions: DC electrodeposition technique, reasonable matching constituents of electrolyte with processing parameters of electrodeposition, and adding organic mixing additive agent, 25deg.C - 65deg.C temperature, velocity of electrolyte flow as 0.5-5.0m / s, and current density as 0.5-5.0A / cm2. The said organic mixing additive agent is composed of 1-15mg / l thiourea, 1-15mg / l bone glue, 0.1-5.0mg / l chlorine ion etc. The prepared electrolytic copper foil has following parameters: thickness less than and equal to 18 micros, tensile strength larger than and equal to 450MPa, extensibility larger than and equal to 5úÑ, and roughness of rough surface less than and equal to 0.40 micros.

Description

technical field [0001] The invention relates to a process for preparing electrolytic copper foil, more particularly, a method for preparing nano electrolytic copper foil for high-performance lithium batteries with a thickness of ≤18 μm. Background technique [0002] Human society in the 21st century is a society that pays equal attention to energy, information and the environment. High-energy batteries are closely related to these three fields and will penetrate into all fields of human life. The lithium battery is considered to be one of the high-energy batteries that can best meet the sustainable development requirements of the future society. At present, in addition to being widely used in traditional fields such as various electronic products, high-energy batteries have also achieved rapid development in emerging civilian fields such as portable electronic devices, built-in artificial organs, and robots. The preparation method of the lithium ion secondary battery negati...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/66C25C1/12C25D7/06
CPCY02E60/10Y02P10/20
Inventor 张世超
Owner 北京中科天华科技发展有限公司
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