基于OpenFOAM的局部滑移边界条件下负载平衡动态网格细化的锂离子电池电极槽模涂层二维和三维CFD模型

IF 2.3 4区 材料科学 Q2 Chemistry
Alexander Hoffmann, Sandro Spiegel, Thilo Heckmann, Philip Scharfer, Wilhelm Schabel
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引用次数: 1

摘要

槽模涂层是制造锂离子电池电极的最先进工艺,具有高精度和可重复性,涵盖了广泛的工艺条件和材料体系。预测进程窗口的常用方法是具有有限表达能力的一维计算。可以使用CFD模拟进行更详细的分析,这通常基于内部代码或闭源软件。在本研究中,在OpenFOAM中创建了二维和三维的两相CFD模型,目的是为更详细地研究槽模涂层过程提供一种开放源代码和文件的方法。自定义边界条件能够在二维模型中正确描述润湿行为。基材边界的标准无滑移边界条件与流体体积求解算法的结合导致了与方法相关的夹带空气,通过允许二维模型中上游半月板的动态润湿线处的局部滑移来防止夹带空气。此外,还实现了负载平衡动态优化算法,以最大限度地减少计算量并增加仿真环境的易用性。通过将模拟过程限值与实验观测值进行比较,验证了模拟结果的正确性。因此,该模型可以详细分析槽模几何形状、材料特性和工艺参数对涂层稳定性和湿膜轮廓的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CFD model of slot die coating for lithium-ion battery electrodes in 2D and 3D with load balanced dynamic mesh refinement enabled with a local-slip boundary condition in OpenFOAM

Slot die coating is a state-of-the-art process to manufacture lithium-ion battery electrodes with high accuracy and reproducibility, covering a wide range of process conditions and material systems. Common approaches to predict process windows are one-dimensional calculations with a limited expressiveness. A more detailed analysis can be performed using CFD simulations, which are often based on in-house code or closed-source software. In this study, a two-phase CFD model in two and three dimensions was created in OpenFOAM with the intent to provide a method for more detailed investigations of the slot die coating process with open access to source code and files. A custom boundary condition enables the proper description of the wetting behavior in the two-dimensional model. The combination of standard no-slip boundary conditions at the substrate boundary with the volume-of-fluid solution algorithm leads to a method-related air entrainment, which was prevented by allowing local slip at the dynamic wetting line at the upstream meniscus in the two-dimensional model. Additionally, a load-balancing dynamic refinement algorithm was implemented to minimize the computational effort and increase the ease of use of the simulation environment. The simulation was validated by comparing the simulated process limits to experimental observations, showing good agreement. As a result, this model enables detailed analyses regarding the influences of slot die geometries, material properties, and process parameters on the coating stability and wet-film profile.

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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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