Simulation of Micro/Nanopowder Mixing Characteristics for Dry Spray Additive Manufacturing of Li-Ion Battery Electrodes
Simulation of Micro/Nanopowder Mixing Characteristics for Dry Spray Additive Manufacturing of Li-Ion Battery Electrodes
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DOI：
10.1115/1.4037769
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发表时间：
2017-12
影响因子：
1
通讯作者：
B. Ludwig;Jin Liu;Yangtao Liu;Zhangfeng Zheng;Yan Wang;H. Pan
中科院分区：
文献类型：
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作者：
B. Ludwig;Jin Liu;Yangtao Liu;Zhangfeng Zheng;Yan Wang;H. Pan
开发了一种新的用于锂离子电池的干喷涂增材制造方法，以取代用于制造锂离子电池电极的传统浆料浇铸技术。干喷涂制造工艺可以允许消除由于使用溶剂来制造电极而需要的时间和能量密集的浆料干燥工艺。对新制造方法的先前研究已经表明成功制造了具有强电化学和机械性能的电极。锂离子电池电极通常由三种基本材料组成：活性材料（AM），粘合剂颗粒添加剂（BPA）和导电颗粒添加剂（CPA）。本文采用离散元法（DEM）模拟研究了干电极粉末材料的混合特性。由于颗粒的尺寸在亚微米至微米尺寸范围内，混合特性严重依赖于颗粒之间的货车范德华力。因此，研究了锂离子电池电极材料表面能对混合特性的影响。等高线图的基础上的DEM模拟结果，其中所选择的材料类型的表面能分量的变化被用来预测不同的颗粒系统的混合特性。对于所研究的情况下，它被发现，实验混合的结果是DEM模拟的结果的代表。[DOI 10.1115/1.4037769]
A new dry spraying additive manufacturing method for Li-ion batteries has been developed to replace the conventional slurry-casting technique for manufacturing Li-ion battery electrodes. A dry spray manufacturing process can allow for the elimination of the timeand energy-intensive slurry drying process needed due to the use solvents to make the electrodes. Previous studies into the new manufacturing method have shown successful fabrication of electrodes which have strong electrochemical and mechanical performance. Li-ion battery electrodes typically consist of three basic materials: active material (AM), binder particle additives (BPA), and conductive particle additives (CPA). In this paper, a discrete element method (DEM) simulation was developed and used to study the mixing characteristics of dry electrode powder materials. Due to the size of the particles being in the submicron to micron size range, the mixing characteristics are heavily dependent on van der Waals adhesive forces between the particles. Therefore, the effect the Li-ion battery electrode material surface energy has on the mixing characteristics was studied. Contour plots based on the DEM simulation results where the surface energy components of selected material types are changed were used to predict the mixing characteristics of different particle systems. For the cases studied, it is found that experimental mixing results are representative of the results of the DEM simulations. [DOI: 10.1115/1.4037769]