Temperature-dependent ionic conductivity and transport properties of LiClO4-doped PVA/modified cellulose composites

Abstract

This paper presents the investigation on physicochemical properties and ionic conductivity of LiClO 4-doped poly(vinyl alcohol) (PVA)/modified cellulose composites. The percolative behaviour of LiClO 4 with dc conductivity (σ dc) for different LiClO 4 weight fractions (p) related to transport dimensionality was also focused. The highest ionic conductivity of 9.79 × 10-6 S cm-1 was observed for 20 wt% LiClO 4 doping level at room temperature. The activation energies (E g) were estimated using temperature-dependent conductivity, which follows the Arrhenius and Vogel-Tammann-Fulcher (VTF) relation. The dynamic fragility (f) and activation energy (E g) vs. T g of polymer composites using equivalence of the both Williams-Landel-Ferry (WLF) and VTF equations were also correlated. Transport properties such as travel time of ions between sites (τ o), mobility (μ), diffusion coefficient (D) and number of transitions per unit time P(E) for normal cationic (Li +) hopping process of LiClO 4-doped PVA/mCellulose composites have been investigated using the Rice and Roth model.

Role of ZrO2 on physico‐chemical properties of PVA/NaClO4 composites for energy storage applications

“…The frequency exponent s decreases with increase in temperature, which suggests that the correlated barrier hopping (CBH) is the dominant conduction mechanism in the prepared composites. According to the CBH model s value should decrease with increase in temperature . In our case ZrO 2 nanoparticles in PVA/NaClO 4 matrix forms a PVA/NaClO 4 ‐ ZrO 2 complex, which forms disorder and as a result creates the trap centers which in turn contributes to observed hopping conduction mechanism.…”

“…2–4 . where C 1 = 17.44 K, C 2 = 51.4 K are WLF parameters .…”

“…where C 1 5 17.44 K, C 2 5 51.4 K are WLF parameters [12,22]. The dynamic fragility describes how fast dynamics change for a glass forming system as approached to T g .…”

“…High level of ionic conductivity can be achieved with increase in sodium salt concentration, but major drawback of these polymer electrolytes is poor in mechanical strength and potential stability. Addition of nano ceramic fillers like TiO 2 , SiO 2 , ZrO 2 , Al 2 O 3 in to PVA‐based electrolytes enhances the mechanical strength as well as conductivity. Yatim et al have been fabricated PEO/NaClO 4 /ZrO 2 for use in Na‐ion batteries by using a solution casting technique, shown an enhancement in ionic conductivity .…”

Green Synthetic Fuels: Renewable Routes for the Conversion of Non-Fossil Feedstocks into Gaseous Fuels and Their End Uses

“…where σ o is the conductivity of pre-exponential factor, E is the activation energy, k B is the Boltzmann constant, and T is the absolute temperature. This relation states that the ion conductivity increases with high temperature [222]. The most critical element of solid oxide electrolyzers is the electrolyte.…”