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Preparation method for copper foil current collector and application

A technology of current collector and copper foil, applied in the field of new material synthesis and preparation, can solve the problems of weak adhesion between copper foil and active material, complicated technology of coating a conductive carbon layer, affecting the utilization rate of electrode materials, etc. Effects of improved power density and low contact resistance

Inactive Publication Date: 2014-02-12
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, copper foil is generally used for the negative electrode collector of lithium-ion batteries. During the charging process, the copper foil directly contacts the electrolyte. Tight combination, which affects the utilization of electrode materials and increases contact resistance
At present, the commonly used method to solve this phenomenon is to coat the surface of the copper foil with a conductive carbon layer to reduce the contact resistance, but the technology of coating the conductive carbon layer is complicated and the cost is high. Lithium-ion battery anode current collector with good material compatibility

Method used

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  • Preparation method for copper foil current collector and application

Examples

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Effect test

Embodiment 1

[0030] A method for preparing a copper foil current collector, comprising the following steps:

[0031] (1) Provide a copper foil with a thickness of 9 μm, soak the copper foil in a hydrochloric acid solution with a concentration of 0.1mol / L for 10 minutes to remove surface oxides, and then ultrasonically clean the copper foil with ethanol and acetone for 20 minutes to remove surface oil and then place it in a chemical Inside the vapor deposition equipment, sealed;

[0032] (2) Introduce 100 sccm of hydrogen gas into the chemical vapor deposition equipment, start heating after exhausting the air, turn on the plasma equipment after heating to 1000°C (the power of the radio frequency matching device is 500w), and inject 200 sccm of methane for 100 minutes After the reaction is over, stop heating, turn off the plasma equipment, stop feeding methane, cool to room temperature under the protection of hydrogen, stop feeding hydrogen, and obtain a copper foil current collector with gr...

Embodiment 2

[0040] A method for preparing a copper foil current collector, comprising the following steps:

[0041](1) Provide a copper foil with a thickness of 15 μm, soak the copper foil in a sulfuric acid solution with a concentration of 0.5mol / L for 5 minutes to remove surface oxides, and then undergo ultrasonic cleaning with ethanol and acetone for 20 minutes to remove surface oil and then place it in a chemical Inside the vapor deposition equipment, sealed;

[0042] (2) Introduce 50 sccm of argon gas into the chemical vapor deposition equipment, and start heating after exhausting the air. After heating to 800°C, turn on the plasma equipment (the power of the radio frequency matching device is 500w), and inject 50 sccm of acetylene to keep After 300 minutes, after the reaction is over, stop heating, turn off the plasma equipment, stop feeding acetylene, cool to room temperature under the protection of argon, stop feeding argon, and obtain a copper foil current collector with graphene...

Embodiment 3

[0045] A method for preparing a copper foil current collector, comprising the following steps:

[0046] (1) Provide a copper foil with a thickness of 12 μm, soak the copper foil in a nitric acid solution with a concentration of 0.3mol / L for 6 minutes to remove surface oxides, and then ultrasonically clean the copper foil with ethanol and acetone for 20 minutes to remove surface oil and then place it in a chemical Inside the vapor deposition equipment, sealed;

[0047] (2) Introduce 60 sccm of nitrogen gas into the chemical vapor deposition equipment, and start heating after exhausting the air. After heating to 900°C, turn on the plasma equipment (the power of the radio frequency matching device is 500w), and inject 100 sccm of ethane to keep After 200 minutes, after the reaction is over, stop heating, turn off the plasma equipment, stop feeding ethane, cool to room temperature under the protection of nitrogen, stop feeding nitrogen, and obtain a copper foil current collector w...

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Abstract

The invention provides a preparation method for a copper foil current collector. The method comprises the steps of: providing a clean copper foil, placing it in chemical vapor deposition equipment, and conducting sealing; introducing a protective gas into the equipment, exhausting air, then starting heating to a temperature of 800-1000DEG C, then starting plasma equipment, introducing a carbon-containing gas, keeping the status for 100-300min, at the end of reaction, stopping heating, turning off the plasma equipment, stopping introducing the carbon-containing gas, and performing cooling to room temperature in a protective gas atmosphere, thus obtaining the copper foil current collector with graphene growing on the surface. The preparation method for the copper foil current collector provided by the invention has a simple preparation process. The contact internal resistance between the prepared copper foil current collector with graphene growing on the surface and a battery active material is greatly reduced, so that the total internal resistance of the battery is reduced, and the power density of the battery is enhanced.

Description

technical field [0001] The invention relates to the field of synthesis and preparation of new materials, in particular to a preparation method and application of a copper foil current collector. Background technique [0002] The current collector is a structure or part that collects current. Its main function is to gather the current generated by the active materials of the battery, provide electronic channels, accelerate charge transfer, and improve the coulombic efficiency of charging and discharging. As a current collector, it needs to meet high conductivity and mechanical properties. Good, light weight, small internal resistance and other characteristics. [0003] Graphene is a two-dimensional carbon atom crystal discovered by Andre K. Geim of the University of Manchester in 2004. Due to its unique structure and photoelectric properties, it has become a carbon material and nanotechnology. Research hotspots in the fields of condensed matter physics and functional materia...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCH01M4/661H01M4/663H01M4/667Y02E60/10
Inventor 周明杰袁新生王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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