Dynamic Fields Visualization of Carbon-Black (CB) Volume Fraction Distribution in Lithium-ion Battery (LIB) Cathode Slurry by Electrical Resistance Tomography (ERT)

Abstract

Dynamic fields visualization method of carbon-black (CB) volume fraction Φ_CB distribution in Lithium-ion battery (LIB) cathode slurry has been proposed based on electrical resistance tomography (ERT) during the manufacturing process. The proposed method consists of an impedance analyzer, a switching circuit, and Φ_CB distribution imaging algorism, archiving to the measurement speed of 5 frames per second. In experiments, Φ_CB distribution was visualized by the proposed method in lab-scale LIB cathode manufacturing equipment. To qualitatively evaluate the Φ_CB distribution images, those images are compared with scanning electron microscope (SEM) images. This comparison shows that the Φ_CB distribution images are qualitatively consistent with SEM images. In addition, in order to quantitatively evaluate the proposed method, the accuracy of reconstructed Φ_CB distribution is evaluated by electromagnetic field simulations. As a result, the root mean square errors RMSE between the known Φ_CB distribution and that obtained by the proposed method was less than 0.56%.