Investigating Degradation Mechanisms in Sodium Solid-State Batteries
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Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Modellbyggare
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Sammanfattning
Solid-state sodium batteries are promising candidates for next-generation electro chemical energy storage, with improved sustainability and safety compared to cur rent lithium-ion technologies. In addition, solid electrolytes could potentially en able the use of sodium metal anodes for increased energy density. However, these
electrodes currently have short lifetime due to electro-chemo-mechanically coupled
degradation mechanisms, which must be well understood in order to mitigate the
problems and extend the lifetime of solid-state sodium batteries. This thesis investi gates a sulfide solid electrolyte, with a particular focus on processes at the interface
with sodium metal. The study involves electrochemical characterization techniques
and imaging with X-ray tomographic microscopy, in order to gain insights into the
processes that limit cell lifetime and efficiency. The results show rapid polarization
of the cells, attributed to chemical degradation at the interface between sodium
metal and the electrolyte. The resulting interphase layer fails to passivate the elec trode, leading to capacity loss from the irreversible side reactions that continuously
consume sodium metal and solid electrolyte. The use of chlorine-doped electrolytes
and protective interlayers presents promising strategies to improve the interfacial
stability and extend the lifetime of sodium metal electrodes.
Beskrivning
Ämne/nyckelord
Solid-state batteries, sodium metal anodes, sulfide electrolyte, X-ray tomographic microscopy, interphase characterization