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Electrolytic copper foil and current collector of energy storage device

An electrolytic copper foil and current collector technology, applied in the field of current collectors, can solve problems such as difficulty in meeting the high strength requirements of lithium battery foils, and achieve the effects of not easy to soften and rupture, and high conductivity

Active Publication Date: 2021-02-26
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional copper foil has softened at this temperature, and it is difficult to meet the high strength requirements of lithium battery foil

Method used

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  • Electrolytic copper foil and current collector of energy storage device
  • Electrolytic copper foil and current collector of energy storage device
  • Electrolytic copper foil and current collector of energy storage device

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0034] First prepare the basic electrolyte (sulfuric acid-copper sulfate electrolyte), which contains copper ions: 90g / L, sulfuric acid: 45g / L and chloride ions 30ppm, and add 10mL / L crystal surface modifier and 5mL / L gloss agent As an additive, the crystal surface modifying agent is a commercially available crystal surface modifying agent (manufacturer: Tianhong, product number ECD731), and the gloss agent is also a commercially available gloss agent (manufacturer: Tianhong, product number GR891).

[0035] A rotating electrode device (grinding and polishing) titanium wheel is used as the cathode, and the anode is an insoluble anode (DSA), and a DC power supply is used, and the cathode is soaked in the electrolyte for 40 seconds, and then the current density is 40ASD. The liquid temperature is 40°C and the electrode rotation speed is 700rpm, and an electrolytic copper foil with a thickness of 8 μm is directly formed on the surface of the titanium wheel.

[0036]After the elect...

experiment example 2

[0038] Prepare basic electrolyte (sulfuric acid-copper sulfate electrolyte), which contains copper ion: 90g / L, sulfuric acid: 45g / L and chloride ion 30ppm, and adds the above-mentioned crystal plane modifying agent of 40mL / L and the above-mentioned luster of 2mL / L agents as additives.

[0039] Use the same electrolysis device as in Experimental Example 1, and first soak the cathode in the electrolyte for 40 seconds, then directly form an electrolytic copper foil with a thickness of 8 μm on the surface of the titanium wheel with a current density of 40ASD, an electrolyte temperature of 40°C and an electrode speed of 700rpm. .

[0040] After the electrolysis is completed, the electrolytic copper foil is separated from the titanium wheel, and subsequent corresponding tests are carried out. The test results are shown in Table 1 below.

experiment example 3

[0042] Prepare basic electrolyte (sulfuric acid-copper sulfate electrolyte), which contains copper ion: 90g / L, sulfuric acid: 45g / L and chloride ion 30ppm, and adds the above-mentioned crystal surface modifier of 40mL / L and the above-mentioned luster of 5mL / L agents as additives.

[0043] Use the same electrolysis device as in Experimental Example 1, and first soak the cathode in the electrolyte for 40 seconds, then directly form an electrolytic copper foil with a thickness of 8 μm on the surface of the titanium wheel with a current density of 40ASD, an electrolyte temperature of 40°C and an electrode speed of 700rpm. .

[0044] After the electrolysis is completed, the electrolytic copper foil is separated from the titanium wheel, and subsequent corresponding tests are carried out. The test results are shown in Table 1 below.

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Abstract

The invention discloses an electrolytic copper foil and a current collector of an energy storage device. The electrolytic copper foil includes a transition layer and a nano twin crystal copper layer formed on the transition layer. The transition layer has an equiaxed crystal in which the volume ratio of the (111) plane is 20% to 40%, the volume ratio of the (200) plane is 20% to 40%, and the volume ratio of the (220) plane is 20% to 40%. . The thickness of the transition layer is 0.2 μm˜1.5 μm. The nano-twinned copper layer has columnar crystals whose volume ratio of the (111) plane is greater than 85%, and the thickness of the nano-twinned copper layer is 3 μm to 30 μm.

Description

technical field [0001] The invention relates to a copper foil technology, and in particular to an electrolytic copper foil and a current collector of an energy storage device. Background technique [0002] Major automakers are optimistic about the market prospects of electric vehicles, and have accelerated the development of new electric vehicles, which has greatly increased the demand for power lithium batteries. Silicon has a theoretical energy density of 4,200mAh / g. It is used as the negative electrode material of new power lithium batteries, which can increase the capacity of single cells and is expected to increase the cruising range of electric vehicles. [0003] In order to cope with the above-mentioned negative electrode current collector copper foil used in the new power lithium battery, it needs to have high conductivity, and at the same time, it must be able to withstand the high temperature of the manufacturing process and the volume expansion and contraction cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/02C25D1/20C22F1/02C22F1/08H01M4/66
CPCC22F1/02C22F1/08C25D1/02C25D1/20H01M4/661H01M4/667Y02E60/10
Inventor 陈振榕邱秋燕
Owner IND TECH RES INST
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