SE987: Composition and electrolyte effects on Prussian blue analog lattices for beyond Li-ion batteries

Prussian blue analogs (PBAs) are well-studied cathodes for beyond Li-ion batteries. Research to improve PBA battery technology is ongoing, including incorporation of different metal centers and tuning vacancy sites, both of which can improve volumetric energy densities of PBAs. Presently, our lab is investigating solvent and electrolyte effects on battery performance. Different solvent and electrolyte combinations can broaden the electrochemical stability window for cycling, allowing access to more positive and more negative redox events, thus leading to increased energy densities. In addition to the electrochemical stability window, the electrolyte composition is important for wettability, ion transfer kinetics, flammability, and structural degradation. By investigating the effects of different solvent compositions, our lab is developing an electrolyte and PBA combination that will broaden cycling potential range without risking the overall integrity of the cell. We are investigating the kinetics and electrochemical properties of our PBA-electrolyte combinations using voltammetry, impedance spectroscopy, charge-discharge cycling, and operando X-ray absorption spectroscopy.