Investigating solid electrolyte interphases on negative electrodes for beyond lithium-ion batteriesTools Dimogiannis, Konstantinos (2023) Investigating solid electrolyte interphases on negative electrodes for beyond lithium-ion batteries. PhD thesis, University of Nottingham.
AbstractThere has been significant interest in beyond lithium-ion batteries to accelerate the transition into a net-zero society. Of these, sodium-ion batteries are the most mature ‘rocking chair’ technology, but there are still concerns hindering its scale-up and commercialization, such as the chemical stability of the solid-electrolyte interphase (SEI). In this thesis, fluoroethylene carbonate, propane sultone, enflurane and tetraglyme were used as additives, to create different SEIs, which improved the electrochemical and chemical properties of the battery, compared to the plain system. During cycling the additives were reduced and incorporated in the SEI, managing to improve the cycling capacity, suppress gas evolution and facilitate charge transfer of the cell. The non-sacrificial character of tetraglyme, in contrast to the other additives, coupled with its non-flammability, offers the possibility of a battery with steady, long-term cycling behaviour and improved safety.
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