Preparation method for aluminum foil current collector and application

Abstract

The invention provides a preparation method for an aluminum foil current collector. The method comprises the steps of: providing a clean aluminum foil, placing it in chemical vapor deposition equipment, and performing sealing; introducing a protective gas into the equipment, at the same time turning on a vacuum system, starting heating when the air pressure is 1-100Pa, then turning on plasma equipment when heated to 500-600DEG C, introducing a carbon-containing gas, maintaining the status for 100-300min, at the end of reaction, stopping heating, turning off the plasma equipment, stopping introducing the carbon-containing gas, and carrying out cooling to room temperature in a protective gas atmosphere, thus obtaining aluminum foil current collector with grapheme growing on the surface. The preparation method for the aluminum foil current collector provided by the invention has a simple preparation process, the contact internal resistance between the prepared aluminum foil current collector with grapheme growing on the surface and a battery active material is greatly reduced, and the phenomenon of embedding lithium ions into the aluminum foil can be prevented, so that the cyclic stability and service life of the lithium ion battery can be improved.

Description

Technical field [0001] The invention relates to the field of synthetic preparation of new materials, in particular to a preparation method and application of an aluminum foil current collector. Background technique [0002] The current collector is a structure or part that collects current. The main function is to collect the current generated by the active material of the battery, provide electronic channels, accelerate the charge transfer, and improve the coulombic efficiency of charging and discharging. As a current collector, it needs to meet the requirements of high conductivity and mechanical properties. Good, light weight and low internal resistance. [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 materials have ...

AI Technical Summary

Problems solved by technology

[0004] At present, the positive current collector of lithium-ion batteries generally uses aluminum foil. During the charging process, the aluminum foil directly contacts the electrolyte. Therefore, the current collector is more prone to corrosion. In addition, the aluminum foil and the active material are not firmly adhered, and the interface is difficult to bond tightly. It affects the utilization rate of the electrode material and increases the contact resistance; in addition, lithium ions and aluminum foil will undergo lithium intercalation reaction, which will damage the aluminum foil, resulting in a decrease in the stability and life of the current collector

At present, the commonly used method to solve this phenomenon is to coat the surface of the aluminum foil with a conductive carbon layer to reduce the contact resistance, but it still cannot prevent the occurrence of lithium intercalation reaction, and the technology of coating the conductive carbon layer is complicated and the cost is high. A lithium-ion battery cathode current collector that is not easily corroded and has good compatibility with electrode active materials

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