Multi-Physics Simulation of Powder Jet Deposition and Optimum Design of the Powder

通过光滑粒子流体力学方法和分子动力学方法等多物理场模拟，研究了粉末与基体高速碰撞时的材料粘附现象。从可视化的结果可以看出，粉末在基片上碰撞后，在10 ns的短时间内被粉碎成10 nm量级的更细的颗粒，并在库仑力的作用下迅速重新组合形成薄膜。我们将这种现象应用于下一代混合动力汽车可充电电池的硅阴极膜形成。它具有良好的充放电循环特性。

Material adhesion phenomenon with high-speed collision of powders onto a substrate was investigated through the multi-physics simulations such as Smoothed Particle Hydrodynamics method and Molecular Dynamics method. As the results of the visualization, it was clear that the powders after a collision on the substrate were crushed to finer particles of the 10 nm order within a short time of 10 ns, and were promptly recombined by Coulomb force to form the film. We applied this phenomenon to a silicon cathode film formation for rechargeable batteries for next-generation hybrid cars. It demonstrated the excellent characteristics of charge and discharge cycle.