Lithium ion-conducting polymer electrolytes based on PVA–PAN doped with lithium triflate

Abstract

Blend polymer electrolytes with optimized composition (92.5 PVA:7.5 PAN) doped with lithium triflate (LiCF 3 SO 3 ) have been prepared in different concentrations by solution casting technique, using DMF as solvent. The prepared electrolytes have been characterized by XRD, FTIR, DSC, AC impedance, and SEM techniques. The complex formation between the blend polymer and the salt has been confirmed by X-ray diffraction and FTIR analyses. Differential scanning calorimetry thermogram has shown a decrease in glass transition temperature with the addition of salt. It has been observed that the ionic conductivity of the doped blend polymer electrolyte increases as the salt concentration increases. The ionic conductivity has been found to be 4.0 × 10 −5 S cm −1 for 92.5 PVA:7.5 PAN:50 M wt% LiCF 3 SO 3 sample at room temperature. The temperature dependence of ionic conductivity has been studied with Arrhenius plot and the activation energies have been calculated. Primary lithium ion battery has been constructed with the configuration Zn + ZnSO 4 7H 2 O/ 92.5 PVA:7.5 PAN:50 M wt% LiCF 3 SO 3 / PbO 2 + V 2 O 5 using the maximum conducting blend polymer, and its discharge characteristics have been studied.

Effect of NASCION‐Type ceramic dispersion in PAN/PVA‐based blend polymer electrolyte: A structural, thermal, and electrical study

“…The FTIR spectra of PAN, PVA, blends, and composite SPEs (PB + LATP30, PB + LAZTP30, and PB + LANbTP30) have been shown in Figure 10a–f. FTIR peaks and their corresponding functional groups have been shown in Table 5 17,44 . Because of the high content of PVA (92.5%) in blend PB FTIR peaks, the blend polymer system shows a similar peak profile to pure PVA, as shown in Figure 10b.Characteristic PVA peaks like 3292 cm −1 (OH stretching), 2940, 2917, and 2853 cm −1 (CH 2 asymmetric), 1717 cm −1 (CO stretching), 1664 cm −1 (CO stretching), 1558 and 1424 cm −1 (CH bending of CH 2 ), 1372 and 1326 cm −1 (CH wagging), 1245 cm −1 (COC symmetry), 1140 and 1092 cm −1 (OH stretching), 1023 cm −1 (CO stretching), 946 cm −1 (OH bending), and 836 cm −1 (CC stretching) have been observed in the blend polymer system.…”

“…FTIR peaks and their corresponding functional groups have been shown in Table 5. 17,44 Because of the high content of PVA (92.5%) in blend PB FTIR peaks, the blend polymer system shows a similar peak profile to pure PVA, as shown in Figure 10b , and 771 cm À1 (C C stretching) have also been observed in blend polymer system at similar wave number except some peak shift due to blending at 1744-1734 cm À1 , 1434 cm À1 , 1417 cm À1 , 1360-1375 cm À1 , 1310-1326 cm À1 , 1041-1023 cm À1 , and 771-836 cm À1 . The peak at 2244 cm À1 corresponds to C N stretching, and PAN became sharper and less intense for the PB spectra.…”

“…16 Additionally, the blending of these two polymers is expected to provide more electrondonating groups ( N and O, which behave as Lewis bases), which can raise the blend polymer film's ionic conductivity. 15,17 Different combinations of blend electrolytes along with their conductivity have been shown in Table 1. The highest dc conductivity of the PB is 1.13 Â 10 À7 S cm À1 at RT, which has been reported for concentration ratios PVA (92.5 wt.%) and PAN (7.5 wt.…”

“…PVA's melting temperature dropped as a result of the mixture, which partially reduced the segments' crystallinity 16 . Additionally, the blending of these two polymers is expected to provide more electron‐donating groups (N and O, which behave as Lewis bases), which can raise the blend polymer film's ionic conductivity 15,17 . Different combinations of blend electrolytes along with their conductivity have been shown in Table 1.…”

Engineering a well-connected ion-conduction network and interface chemistry for high-performance PVDF-based polymer-in-salt electrolytes

“…To date, numerous efforts have been attempted and significant progress has been made in the past decade in developing various Li-ion conducting polymer matrices, such as poly(ethylene oxide) (PEO), poly(vinylidene fluoride) (PVDF), poly(acrylonitrile) (PAN), and poly(vinyl alcohol) (PVA). 9–12 Among them, PVDF-based polymer electrolytes have been considered the most promising candidates for SSBs due to their relatively high mechanical strength, good thermal stability and wide electrochemical window. 13–16 Unfortunately, the low ionic conductivity of PVDF-based polymer electrolytes at room temperature (<10 −4 S cm −1 ) greatly limits their practical applications in high-performance SSBs.…”