Method for preparing lithium strip by fused deposition

Abstract

The invention relates to a method for preparing a lithium strip by fused deposition and belongs to the technical field of lithium strips, and aims to provide the method for preparing the lithium stripby the fused deposition. The method comprises the following specific steps: S0, setting a deposition target value and inputting an initial control parameter value; S1, carrying out the fused deposition by controlling of control parameters; S2, monitoring a lithium film obtained by the fused deposition in real time to obtain a monitoring value; S3, comparing the monitoring value with the deposition target value; if a comparison result does not meet the requirements, executing the step S4; if the comparison result meets the requirements, executing the step S5; S4, carrying out logical operationaccording to the thickness of the lithium film and the control parameters, correcting the values of the control parameters, and then sequentially performing the steps of S1 to S3; S5, continuously performing the fused deposition, to obtain an ultrathin lithium strip. According to the method disclosed by the invention, the lithium strip is prepared by adopting a model controlled metal fused deposition technology; the ultrathin lithium strip with flatness, uniformity and controllable thickness is deposited on an aluminum foil. The method has the advantages of high utilization rate of raw materials, lower equipment cost and suitability for automatic batch production.

Description

technical field [0001] The invention relates to a method for preparing a lithium ribbon by fusion deposition, and belongs to the technical field of lithium ribbon preparation. Background technique [0002] The rapid development of electric vehicles has put forward new and higher requirements for the energy density of lithium batteries. Lithium metal has a high specific energy density (3860mAh / g), which is the best choice for the anode material of high-energy batteries in the future. Therefore, the preparation of lithium metal strips (especially ultra-thin metal lithium strips) has become a current research hotspot. [0003] At present, the mechanical calendering method is usually used to prepare lithium thin strips, but the calendering method has the following problems: lithium strips are easy to break during the calendering process; it is difficult to uniformly control the thickness of ultra-thin lithium strips below 50 μm; there are many scraps and waste of lithium raw mat...

AI Technical Summary

Problems solved by technology

[0003] At present, the mechanical calendering method is usually used to prepare lithium thin strips, but the calendering method has the following problems: lithium strips are easy to break during the calendering process; it is difficult to uniformly control the thickness of ultra-thin lithium strips below 50 μm; there are many scraps and waste of lithium raw materials Large; high precision requirements for calendering machinery, large investment in equipment

At present, there are many researches in this area, but it is difficult to achieve real-time progress and difficult to carry out mass production

For example, the CN200920251219.3 patent uses a mechanical calendering process to prepare lithium foil with a passivation layer, which is prone to tensile deformation or even fracture during the production process; the CN201610393493.9 patent proposes a complex temperature-controlled rolling lithium foil device. To ensure the consistency of the rolled lithium film in terms of thickness and hardness; CN201410443081.2 patent uses a lithium liquid coating method to prepare metal lithium strips, but it uses a simple hydraulic cylinder as the power drive system, and the coating is relatively rough, making it difficult to ensure that the lithium film Uniformity of

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