Abstract
Two functional high-voltage additives, namely 2-(2,2,3,3,3-pentafluoropropoxy)-1,3,2-dioxaphospholane (PFPOEPi) and 1-methyl-3,5-bis(trifluoromethyl)-1H-pyrazole (MBTFMP) were combined as functional additive mixture in organic carbonateâbased electrolyte formulation for high-voltage lithium battery application. Their impact on the overall performance in NMC111 cathode-based cells was compared with the single-additiveâcontaining electrolyte counterpart. The obtained results point to similar cycling performance of the additive mixture containing electrolyte formulation compared with the MBTFMP-containing cells, whereas the single PFPOEPi-containing cells displayed the best cycling performance in NMC111||graphite cells. With regard to the cathode electrolyte interphase (CEI), characterized and analyzed by means of scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), both the MBTFMP and the PFPOEPi functional additives decompose on the NMC111 surface in single-additiveâcontaining electrolyte formulations. However, the thickness of the CEI formed in the additive mixtureâcontaining electrolyte formulation is determined by the MBTFMP additive, whereas the PFPOEPi additive impacts a change in the composition of the CEI. Furthermore, the MBTFMP additive decomposes prior to the PFPOEPi and, therefore, dominates the cycling performance of NMC111||graphite cells containing functional additive mixtureâbased electrolyte. This systematic approach allows us to understand the synergistic impact of each functional additive in an electrolyte formulation containing an additive mixture and helps to identify the right additive combination for advanced electrolyte formulation as well as to elucidate whether the single-additive or the additive mixture approach is more effective for the development of advanced functional electrolytes for lithium-based cell chemistries.Graphical abstract
Highlights
Lithium-based batteries (lithium ion batteries (LIB) and lithium metal batteries (LMB)) are still seen as the most promising electrochemical energy storage system candidates for automotive and portable applications [1,2,3].Dedicated to Prof
A functional additive mixtureâcontaining electrolyte formulation consisting of a phospholane- and a pyrazole-based additive was systematically investigated for high voltage application in LIBs and correlated to the single-additiveâcontaining electrolyte formulations to determine the influence of each additive in the additive mixtureâcontaining electrolyte and to evaluate whether the single-additive or the additive mixture approach is more effective for the development of advanced LIBs
electrochemical impedance spectroscopy (EIS) analysis points out that the MBTFMP additive impacts the formation of an effective interphase, whereas the PFPOEPi additive is responsible for a decreased Rct in the additive mixtureâcontaining cells
Summary
Lithium-based batteries (lithium ion batteries (LIB) and lithium metal batteries (LMB)) are still seen as the most promising electrochemical energy storage system candidates for automotive and portable applications [1,2,3].Dedicated to Prof.
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