| Abstract [eng] |
Electrochemical batteries are sought as one of the most attractive technologies for storing electrical energy. They have superior round-trip energy efficiency, low environmental footprint, easy scalability, and wide available power and energy range. Li-ion batteries have become the battery technology of choice, however, the highly volatile cost and supply of lithium as well as safety issues related to the use of highly flammable organic electrolytes requires the search and development of alternatives. Na-ion batteries, especially those employing aqueous electrolytes, are attracting increasing attention as potential candidates, especially suitable for large-scale applications. The aqueous aspect makes them significantly safer, non-flammable, low cost and environmentally friendlier with respect to comparable Li-ion technologies. The main goal of this work was to find and develop new framework electrode materials which would be suitable for the next generation aqueous Na-ion batteries in terms of their synthesizability, charge capacity, energy density, and stability. NaTi2(PO4)3, Na4Mn3(PO4)2(P2O7), Na3MnPO4CO3, Na3Fe2(PO4)3, Na4Fe3(PO4)2(P2O7), Na2-xFe[Fe(CN)6]⋅yH2O, Na7V4(PO4)(P2O7)4 and Na3VFe(PO4)3 were synthesized by solid-state, co-precipitation, sol-gel and hydrothermal methods. Additionally, materials were characterized by X-ray diffraction, scanning and transmission electron microscopies, thermal and elemental analysis as well as electrochemically investigated by cyclic voltammetry and galvanostatic charging/discharging. |
