電気等価回路インピーダンストモグラフィ（EEC-EIT）による正極スラリー混合中のスラリー内部構造のインライン可視化

抄録

Particle dispersion configuration in LiCoO₂-CB-NMP/PVDF cathode slurry of lithium-ion battery (LIB cathode slurry) has been cross-sectionally visualized by Electrical Equivalent Circuit- Electrical Impedance Tomography (EEC-EIT). EEC-EIT reconstructs two types of conductivity images regarding LiCoO₂ particle interface Δσ^PI and NMP-PVDF solution Δσ^SO from the resistance elements R^PI and R^SO calculated by EEC model, which is modeled based on the configuration of LIB cathode slurry. We experimentally evaluated EEC-EIT under LIB cathode slurry mixing in a beaker with eight electrodes at mixing speed of ω = 200 rpm or 700 rpm. As the results, Δσ^PI and Δσ^SO were increased as the mixing time t elapses, which indicates that CB particles penetrated between LiCoO₂ particles and that formation of CB-PVDF aggregates occurred, respectively. Moreover, the two types of images are quantitativity compared with scanning electron microscope (SEM) images.