Ion and polymer chain motion in a superionic sodium-poly (ethylene oxide) complex

Study of a new polymer electrolyte poly(ethylene oxide): NaClO3 with several plasticizers for battery application

“…Interest in solid polymeric electrolytes has increased the number of ion‐conducting materials because of their possible applications (such as thin‐film formation, interfacial contacts and desirable sizes) as solid electrolytes in advanced high‐energy electrochemical devices, eg batteries, fuel cells, electrochemical devices and photo‐electrochemical solar cells poly(ethylene oxide) (PEO) in particular is an exceptional polymer which dissolves a wide variety of salts to form polymeric electrolytes; the chemical stability of the ether functional group strengthens the superiority of PEO as a host for a solid polymer electrolyte 1–7. Temperature‐dependent conductivity studies, surface analysis, glass transition temperature, structural changes, and cell studies of many sodium‐ion‐conducting polymer electrolytes based on PEO poly(propylene oxide) (PPO) and poly(bis‐methoxyethoxy‐ethoxy phosphazene) (MEEP) complexed with, NaClO 4 , NaSCN, NaCF 3 SO 3 , NaPF 6 , NaI, NaYF 4 and NaNO 3 have been reported earlier 8–15. To obtain moderate properties of polymer electrolytes (such as increase in conductivity, a wide redox stability, low melting point, change in amorphous phases, increase in ionic mobility, decrease in viscosity, high ability to dissolve salts), a new trend is the addition of plasticizers to the corresponding host polymers.…”

Ionic Conductivity and 7Li NMR Study of Solid Polymer Electrolytes Based on Polyetherurethane Copolymer Networks

“…These results suggest that the balance should be required for optimum conductivity in polymer electrolyte in which the ion-polymer interactions must be sufficiently strong to generate the charge carriers (free mobile ions), but excessively strong association may suppress the ionic motion at ambient temperature in this system. With the solid echo data as a function of temperature, the fraction of free lithium ions (xF) and their spin-spin relaxation times (T 21 ) could be also estimated at various temperatures. Only the fraction of free Li+ ions which have long T 2 values (xF) is responsible for the ionic conduction, the temperature dependence of xF may be explained by a dissociation equilibrium.…”

“…The T 21 values associated with the mobilities of free lithium ions as a function of temperature are also shown in Figure 5. From the plot of ln(T 21 ) vs. 1/T, the activation energies for ionic migration are calculated. In an attempt to compare these results with the ones obtained from conductivity measurements, the activation energies are also approximately calculated from the ln (J vs. 1/T by using the conductivity data in Figure 2, the results are summarized in Table IV ._, 75°c.…”