| 초록 |
Calendering is a key process in Li-ion battery (LIB) production that heavily influences the microstructure of the electrode, thus affecting the overall performance of the battery. Therefore, investigating the calendering impact on electrode microstructure is necessary to optimize the design of LIB. In this work, the microstructural evolution of graphite anode during calendering was studied by implementing realistic three-dimensional (3D) microstructures. The 3D microstructures of non-calendered and calendered electrodes were reconstructed using X-ray nano-computed tomography. Then the deformation of the non-calendered structure with a gradual increase of strain in through-plane direction was simulated. Structural properties such as porosity and tortuosity of the resulting microstructure were investigated, which were then compared to the properties of the actual calendered structure. The study showed exponential relationships between microstructural properties with progressing calendering strain. This suggests a possible method to predict changes in microstructure that occur during calendering using a structure obtained through tomographic technique. |
