Nmr Studies of Polymer Electrolytes

Abstract

The results of several investigations of solvent-free polymer electrolytes by nuclear magnetic resonance (NMR) spectroscopy conducted by the authors and other groups are reviewed. 23Na NMR spectra of a wide variety of amorphous polymer electrolytes are characteristic of the second-order quadrupole broadened central ± 1/2 transition with a distribution of quadrupole couplings. The temperature dependence of the linewidth is similar across a wide range of materials, and highlights the importance of polymer segmental motions above the glass transition temperature to ion mobility. Strong cation-anion interactions in poly(propylene oxide) complexes are indicated by measurements of mobile ion concentrations and, in some cases, the observation of salt precipitation at elevated temperature.

NMR studies of ion mobility and association in polyether‐based polymer electrolytes

“…The components are easily separable by their different T 1 's, the short T 1 (-ms) component corresponding to mobile Na÷ ions solvated by the polymer segments while the longer T 1 (s) component is associated with immobile ion-clusters. [18,23] An important precaution that must be observed in such measurements is to use quartz rather than pyrex sample tubes because the latter contain eodium. In fact, even the external (to the rf coil) illustrate separately the effects of 1 H and 1 9 F decoupling.…”

Conductivity studies on PEO:NaClO3 electrolyte system with different plasticizers

“…The chemical stability of the ether functional group strengthens the superiority of PEO as a host for a solid polymer electrolyte [6,7]. Many sodium-ion conducting polymer electrolytes based on PEO(polyethylene oxide), PPO(poly propylenc oxide) and MEEP(poly-bis methoxy ethoxy ethoxy phospanzene) complexed with, NaCIO4, NaSCN, NaCF3SO 3, NaPF6, Nal, NaYF4 and NaNO 3 have been reported [8][9][10][11][12][13][14][15].…”

Cells studies on PEO/PEG/NaClO3 thin-film electrolyte system based on composite V2O5 electrode

“…Many sodium-ion-conducting polymer electrolytes based on polyethylene oxide (PEO), polypropylene oxide (PPO), and poly-bismethoxyethoxyethoxyphospanzene complexed with NaSCN, NaI, NaClO 4 , NaCF 3 SO 3 , NaPF 6 , NaYF 4 , NaNO 3 , and NaClO 3 [5][6][7][8][9][10][11][12][13] have been reported earlier. Vanadium pentoxide (V 2 O 5 ) is a powerful cathode material having reasonably high-voltage and high-discharge capacity [14][15][16].…”