Your study elegantly presents [P4441O1][PF6] as achieving a ‘Golden Mean’ between high lithium-ion conductivity and the formation of an anion-derived, inorganic-rich SEI. In the context of broader electrolyte design strategies, how do you envision tuning the cation structure further to achieve system-specific balance points for different electrode chemistries (e.g., silicon or lithium-sulfur systems)?
Have you observed or predicted any long-term decomposition pathways or potential degradation products of the ether-functionalized phosphonium cation during extended cycling or at elevated temperatures? If so, how might these influence the chemical evolution of the SEI or CEI over time?