3D Modeling on Diffusion-Dependent Graphite-Silicon Electrode for All-Solid-State Batteries

The novel electrode design, which is a diffusion-dependent electrode structure composed only of active materials, can theoretically realize high energy density. The diffusion-dependent electrode structure can transport lithium ions in the entire electrode through lithium-ion diffusion between the active material particles unless the connectivity between the active material particles is cut off. However, since the electrode structure transfers ions through diffusion, if the thickness of the electrode is too thick, there is a possibility that the performance may have deteriorated. For this purpose, by using not only graphite but also silicon particles, it is possible to have a thin electrode structure compared to the same capacity. In this study, graphite-silicon diffusion-dependent electrode according to the silicon particle size is formed into a digital three-dimensional electrode structure and based on this, electrochemical simulation and analysis of an all-solid-state battery having a diffusion-dependent electrode are performed. The importance and cause of the size of silicon particles in the graphite-silicon diffusion-dependent electrode will be investigated. Reference Diffusion-dependent graphite electrode for all-solid-state batteries with extremely high energy density, ACS Energy Letters , 5(9) (2020) 2995-3004 Revisiting TiS2 as a diffusion-dependent cathode with promising energy density for all-solid-state lithium secondary batteries, Energy Storage Materials , 41 (2021) 289-296