Porous pro-lithium copper foil current collector material and preparation method thereof

Abstract

The invention discloses a porous pro-lithium copper foil current collector material and a preparation method thereof, and belongs to the technical field of lithium batteries. The porous pro-lithium copper foil current collector material has double layers which are an outer cladding layer and an inner cladding layer respectively. The outer cladding layer is made of a nitrogen-doped carbon material,and the inner cladding layer is made of a copper oxide nanosheet. The copper oxide nanosheet is grown on a copper foil current collector. The copper foil is used as the base of a conductive current collector, and is oxidized in an oxygen-containing atmosphere so as to grow a pro-lithium CuO nanosheet having a certain thickness and simultaneously generate a porous shape, increase the specific surface area of the material, and contribute to the uniform deposition of metallic lithium. Further, dopamine is self-polymerized on the porous pro-lithium CuO nanosheet copper foil current collector. After carbonized, the polydopamine is converted from noncrystalline carbon to crystalline carbon to coat the CuO nanosheet, which significantly increases the electrical conductivity and the structural stability of the pro-lithium CuO nanosheet.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a porous lithium-friendly copper foil current collector material and a preparation method thereof. Background technique [0002] Lithium secondary batteries with carbon-based materials as negative electrodes have been widely used, from Bluetooth batteries, mobile phone batteries, tablet computers to power vehicles, drones, etc. Carbon-based materials are low in cost, stable in performance, and have a wide range of sources , all play an important role in our lives. However, there are some inherent shortcomings of carbon-based materials. For example, the theoretical capacity of graphite-based carbon-based materials is low, only 372mAh / g, and the capacity of commercial carbon-based materials has gradually reached the ceiling. To further increase the capacity of carbon-based materials has already It has become very difficult, which has caused a great contradict...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of uneven deposition of lithium metal on the copper foil current collector, which is easy to form lithium dendrites and cause safety accidents caused by dendrites piercing through the diaphragm during the cycle, and to provide a porous lithium-friendly copper foil collector. Fluid material and its preparation method. In the method, the copper foil current collector substrate is annealed in an oxygen-containing atmosphere to grow porous lithium-loving CuO nanosheets, and then self-aggregate dopamine on the surface of the prepared porous lithium-loving CuO nanosheets. , high-temperature annealing, the prepared current collector exhibits good electrochemical performance

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