A cryogenic preparation method for preparing lithium/copper/lithium foil

Abstract

The invention provides a deep-cooling preparation method for preparing a lithium / copper / lithium foil. A copper foil and a lithium foil with the width equal to that of the copper foil are used as raw materials, the copper foil and the lithium foil are placed on raw material curling units respectively, the lithium foil is protected by using argon, the upper surface and the lower surface of the copper foil are cleaned, oxides on the surface are removed, the copper foil and the lithium foil enter a deep-cooling tank with the temperature range of -60--20 DEG C through a transfer roller to be subjected to complete superimposition, and the lithium / copper / lithium composite foil is obtained; the lithium / copper / lithium composite foil is subjected to continuous deep-cooling treatment so as to be cooled to -40--20 DEG C, the temperature of the roller deformation area is controlled to be -40--20 DEG C, and the lithium / copper / lithium composite foil obtained after deep-cooling treatment is subjectedto deep-cooling rolling by using a deep-cooling rolling mill unit; after deep-cooling rolling, the rolling reduction of the rolled product reaches 30-50%. A lithium metal layer is cooled to -40--20 DEG C from room temperature, the deformation resistance of the lithium metal is greatly improved, the deformation coordination of a lithium layer and a copper layer is further greatly improved in the lithium / copper / lithium composite foil rolling process, and the lithium layer is prevented from adhering to the roller.

Description

technical field [0001] The invention belongs to the technical field of metal material rolling, and in particular relates to a cryogenic preparation method for preparing lithium / copper / lithium foil. Background technique [0002] Lithium batteries are now widely used in new energy vehicles, mobile phones, etc. Improving the energy storage of lithium batteries is an issue that academia and industry attach great importance to today. In the preparation process of lithium batteries, the preparation of lithium / copper / lithium composite foils is particularly important. [0003] In the preparation process of lithium / copper / lithium composite foil, copper has very good electrical conductivity and relatively high strength, but the density of lithium metal foil is very low. At the same time, due to the very low melting point of lithium metal, in lithium / copper During the preparation process of copper / lithium composite foil, the deformation resistance of lithium metal is very small, and p...

AI Technical Summary

Problems solved by technology

[0003] In the preparation process of lithium / copper / lithium composite foil, copper has very good electrical conductivity and relatively high strength, but the density of lithium metal foil is very low. At the same time, due to the very low melting point of lithium metal, in lithium / copper During the preparation process of copper / lithium composite foil, the deformation resistance of lithium metal is extremely small, and problems such as lithium foil breaking and sticking to the roll often occur

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