A homologous series of fire-retardant oligoalkyleneoxy-phosphates was synthesized for evaluation as liquid or gel-type electrolyte media for dye-sensitized solar cells (DSSCs) and secondary lithium batteries. Unoptimized DSSC electrolyte formulations for DSSCs achieved ionic conductivities as high as 5.71 × 10-3 S·cm-1 and DSSC test-cell efficiencies up to 3.6% as well as Voc, Jsc, and ff up to 0.81 V, 8.03 mA·cm-2, and 0.69, respectively. Poly(bis-(2-(2-methoxyethoxy)ethoxy)phosphazene)-based Li+-conducting gel electrolytes plasticized with the best performing phosphate had conductivities as high as 9.9 × 10-4 S·cm-1 at 30 C. All the liquids have boiling points higher than 197 C. The results show that the viscosity, glass transition temperatures, and conductivity of the phosphates are dependent mainly on the length of the longest alkyleneoxy chain.
All Science Journal Classification (ASJC) codes
- Materials Science(all)