Abstract
The present research, reports the hygrothermal behavior of poly [ethylene oxide] (PEO) based composite film
(500 and1000 μm) containing NH4I and KBr (5–20 wt%) as the mobile phase and non-reactive silica (15 wt%) as
the filler. These are termed as PK/NSiO2-series for solvent sorbed and (PK/NSiO2)NS for non-swelled film. The
novelty of the research lies in the analyses of non-Fickian solvent diffusion trait of films using python programming. The presence of ions and its variable polarizable nature is found to influence the number density of
bonded and free solvent content along with the extend of cross linkage. Introduction of silica is found to enhance
the ionic conductivity (about one order higher) of the film irrespective of the type of charge carrier owing to the
improved dispersion within the matrix. Non-Fickian diffusion is found to influence the ionic conductivity of
P2K20SiO2 (10− 5 Scm− 1 to 10− 2 Scm− 1) minimizing the degradation to 0.2 %ΔC/1000 h (>1 %ΔC/1000 h, tested
for 2000 h) compared to P2N20NSiO2. In contrast, ion migration in P2NSiO2 is guided by Rice and Roth model
and being more polarizable ions, the mobility is significant which maximizes the conductivity to ~10− 1 Scm− 1
.
Microstructural study shows heterogenous nucleation to be more pronounced upon addition of silica filler
wherein the homogeneity, inter fibrillar interaction and grain growth of spherulites is higher. This tends to
extend amorphous regions thereby propagating the ion migration path. The influence of sorption process is
studied in terms of electrochemical impedance, dielectric analyses and long term cyclability (20,000 h) in terms
of loss tangent.
(500 and1000 μm) containing NH4I and KBr (5–20 wt%) as the mobile phase and non-reactive silica (15 wt%) as
the filler. These are termed as PK/NSiO2-series for solvent sorbed and (PK/NSiO2)NS for non-swelled film. The
novelty of the research lies in the analyses of non-Fickian solvent diffusion trait of films using python programming. The presence of ions and its variable polarizable nature is found to influence the number density of
bonded and free solvent content along with the extend of cross linkage. Introduction of silica is found to enhance
the ionic conductivity (about one order higher) of the film irrespective of the type of charge carrier owing to the
improved dispersion within the matrix. Non-Fickian diffusion is found to influence the ionic conductivity of
P2K20SiO2 (10− 5 Scm− 1 to 10− 2 Scm− 1) minimizing the degradation to 0.2 %ΔC/1000 h (>1 %ΔC/1000 h, tested
for 2000 h) compared to P2N20NSiO2. In contrast, ion migration in P2NSiO2 is guided by Rice and Roth model
and being more polarizable ions, the mobility is significant which maximizes the conductivity to ~10− 1 Scm− 1
.
Microstructural study shows heterogenous nucleation to be more pronounced upon addition of silica filler
wherein the homogeneity, inter fibrillar interaction and grain growth of spherulites is higher. This tends to
extend amorphous regions thereby propagating the ion migration path. The influence of sorption process is
studied in terms of electrochemical impedance, dielectric analyses and long term cyclability (20,000 h) in terms
of loss tangent.
| Original language | English |
|---|---|
| Pages (from-to) | 123179 |
| Number of pages | 13 |
| Journal | Journal of Non-Crystalline Solids |
| Volume | 644 |
| DOIs | |
| Publication status | Published - 23 Aug 2024 |