Low-viscosity ionic liquid–doped solid polymer electrolytes

Abstract

Polymer electrolyte films based on poly(ethylene oxide) doped with salt sodium nitrate and ionic liquid (IL; 1-ethyl 3-methylimidazolium thiocyanate) have been prepared and characterized by differential scanning calorimetry (DSC) and impedance spectroscopy. The relative percentage of crystallinity of polymer electrolytes has been calculated by using DSC thermograms and electrical properties by using impedance spectroscopy. The incorporation of IL in polymer matrix increases the conductivity of polymer electrolyte. The maximum value of ionic conductivity of polymer electrolyte is found to be 1.93 × 10−4 S m−1 with 9 wt% IL.

Humidity‐Dependent Ion Conduction Mechanism of PVA‐Based Polymer Electrolyte Films

“…However, due to the more ions available in the matrix at 85% RH, the mutual dipole‐dipole interaction (similar to steric hindrance in liquid electrolytes) causes a decrease in their mobility (Figure 5b). [ 36,41 ] Therefore, we can conclude that the role of ions due to salt dominates at lower humidity levels, whereas, at higher RH values, the role of water molecules dominate in the matrix.…”

“…[36] It may be noted that the equation was developed for glasses, which can be successfully extended to other amorphous matrices including polymer electrolytes. [36] To the best of our knowledge, there is no direct method for calculating the mobility of ions; therefore, the mobility of free ions in the PE is calculated using Equation (2) by substituting the values of 𝜎 dc and n, obtained for each composition, from Equations ( 1) and (3), respectively.…”

“…where 𝜎 dc is dc the ionic conductivity, 𝜖 0 is the permittivity of free space, 𝜀 ′ s is equal to one-tenth of the maximum value of real part of permittivity, 𝜔 is the nearest frequency corresponding to the 𝜀 ′ s value, k is the Boltzmann's constant, T is the absolute temperature, e is the charge on an electron, and d is the thickness of the film. [36] It may be noted that the equation was developed for glasses, which can be successfully extended to other amorphous matrices including polymer electrolytes. [36] To the best of our knowledge, there is no direct method for calculating the mobility of ions; therefore, the mobility of free ions in the PE is calculated using Equation (2) by substituting the values of 𝜎 dc and n, obtained for each composition, from Equations ( 1) and (3), respectively.…”

Change in charge carrier dynamics by incorporating ionic liquid into poly ethylene oxide–based sodium acetate polymer electrolytes

“…17-18 Therefore, due to unique properties ionic liquid are suitable as plasticizers and as electrolytes for energy devices. 19-24 Gupta et al 25-26 also reported the PEO based sodium ion conducting polymer electrolytes with salts NaSCN and NaNO 3 and effect of mixed sodium anion in PEO-based polymer electrolyte have also been reported in literature. 27 However, more insight for the ion transport mechanism in solid polymers electrolytes is required for complete understanding of the ion dynamics in these materials.…”

Preparation of biacidic tin-based ionic liquid catalysts and their application in catalyzing coupling reaction between ethylene carbonate and dimethyl succinate to synthesize poly(ethylene succinate)

“…Ionic liquids have been widely used in electrochemistry, organic synthesis, catalysis, extraction, and many other fields due to their good solubility, thermal stability, designable structure, and absence of saturated vapor pressure. [34][35][36][37][38][39][40][41][42][43][44][45] Li et al 41 prepared ionic liquid catalyst [BSO 3 HMIM]HSO 4 -Fe 2 (SO 4 ) 3 , realized concerted catalysis between Brønsted acid and Lewis acid, and used it to catalyze the production of biodiesel, with a conversion rate of 95.7%. Therefore, green and stable Brønsted acidic ionic liquids are combined with Lewis acidic metal tin with excellent catalytic performance (which uses relatively safe SnCl 4 Á5H 2 O as the tin source) to design and prepare a tin-based functional ionic liquid catalyst with high stability and catalytic activity.…”