Polyphosphonates as ionic conducting polymers

Academic Article

Abstract

  • Polyphosphonates, a class of polymers with the generic formula –[P(R)(X)–OR'O] –, exhibit a high degree of modularity due to the range of R, R', and X groups that can be incorporated. As such, these polymers may be designed with a polyethylene oxide (PEO) backbone (R' group) and employed as solid polymer electrolytes (SPEs). Two PEO-containing polyphosphonate analogs (R = Ph; X = S or Se) were doped with LiPF and their conductivities were measured. Conductivities were similar (X = S) to or exceeding (X = Se) those of standard PEO systems (just below 10 S/cm at 100°C). Binding models for Li were generated using P{ H}NMR titration experiments. Binding of Li by these polyphosphonates followed a positive cooperativity model, and varying the X group (S or Se) affected the observed cooperativity (Hill coefficient = 1.73 and 4.16, respectively). The presence of Se also leads to an increase in conductivity as temperature is raised above the T , which is likely an effect of reduced Columbic interactions. Because of their modularity and ease with which cation binding can be evaluated using P{ H} NMR titration experiments, polyphosphonates offer a unique approach for the modification of Li ion battery technology. n 6 g −4 + 31 1 + 31 1 +
  • Digital Object Identifier (doi)

    Author List

  • Totsch TR; Popov I; Stanford VL; Lucius AL; Foulger SH; Gray GM
  • Start Page

  • 139
  • End Page

  • 145
  • Volume

  • 59
  • Issue

  • 2