The Impact of a Temperature-Sensitive Sensor on a Commercial Li-ion Battery Cell Graphite Electrode

Abstract

This thesis aims to provide insight into structural changes and lithiation of the graphite electrode of a commercial multi-layered prismatic pouch cell. The commercial pouch cell was equipped with a reference electrode and temperature-sensitive optical fiber and (dis)charged at various current rates. The data analysed in this thesis was collected during the operando wideangle X-ray scattering experiment conducted as a part of the INSTABAT and BIGMAP projects. It was observed that the presence of the fiber causes heterogeneities in the state of charge around the optical fiber. The results demonstrate that the information on the state of charge obtained near the optical fiber exclusively describes the region around the optical fiber.