Insights into the morphological changes undergone by the anode in the lithium sulphur battery system
Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
In this thesis, the morphological changes of the anode surface in lithium sulphur cell, during early cycling, were simulated using symmetrical lithium electrode cells with dissolved polysulphides (PS) in the electrolyte. Electron microscopy (SEM) was used as the principal investigation technique to study and record the morphological changes. The resulting images from the SEM were analysed and discussed. The initial surface structure of the lithium anode largely influenced the ensuing morphological changes taking place through lithium dissolution (pits) and lithium deposition (dendrites) during discharge and charge respectively. The rate of lithium dissolution and deposition was found to be linearly proportional to the current density applied to the cell and the effect of cycling on the anode was proportional to the total charge of the cell in general in agreement with the expected reaction. The effect of self-discharge on the anode was also studied using photoelectron spectroscopy (XPS) in tandem with SEM. The results indicated that self-discharge, occurring in the form of corrosion of the anode SEI by PS reduction, was influenced by the altered morphology of the cell after cycling.
The findings presented in this project can be understood as a preliminary description for the morphological changes in the anode and their influence in the performance of lithium sulphur battery, which can be further investigated by more advanced methods.
Place, publisher, year, edition, pages
2014. , 55 p.
MSc ET, 14003
Lithium sulphur batteries, Li anode, morphology, dendrites, pits, cycling
IdentifiersURN: urn:nbn:se:uu:diva-236378OAI: oai:DiVA.org:uu-236378DiVA: diva2:765276
Scania CV AB
Master Programme in Energy Technology
2014-11-18, Å4005, Lägerhyddsvägen 1, Uppsala, 15:45 (English)
Lacey, Matthew, Post doctoralTengstedt, Carl, Senior Engineer, Materials Technology
Mathieu, Roland, Senior LecturerBrandell, Daniel, Senior Lecturer
Joint collaboration project between Scania CV AB and Uppsala University.2014-11-242014-11-192014-11-24Bibliographically approved