Abstract
Film of PEO containg AgCF3SO3 were prepared by the solution casting technique. Fourier transform infrared (FTIR) spectroscopy have been carried out on a series of complexes containing poly (ethylene oxide) PEO and silver triflate (AgCF3SO3) salt. Spectral analysis of all the samples has revealed the complexation of silver ions with oxygen in PEO. The ac conductivity and electrical modulus of the samples prepared have been analyzed. The ac conductivity was observed to obey the Universal power law. The temperature dependence of the power law exponent n is reasonably interpreted by the overlapping large polaron tunneling (OLPT) model. The imaginary part, M” of electrical modulus shows the formation of dispersion peak. The plot of log conductivity relaxation times and log sigma as a function of salt concentration was in accordance with each other.
Highlights
Polymer based solid electrolytes are one of the most extensively studied systems
In the present work we intend to study the effect of silver salt concentrations in PEO-based polymer electrolytes by means of vibrational spectroscopy and complex impedance analysis
For pure PEO, C-H stretching mode can be observed at 2876 cm−1, CH2 scissoring mode at 1466 cm−1, CH2 wagging mode at 1360 and 1341 cm−1, CH2 twisting mode at 1279 cm−1, C-O-C stretching at 1104, CH2 rocking and C-O-C vibration mode at 960 cm−1, CH2 rocking at 841 cm−1 while C-O-C bending at 528 cm−1
Summary
Polymer based solid electrolytes are one of the most extensively studied systems. Silver ionconducting polymer electrolytes based on PEO appear to be the most appropriate choice for various electrochemical applications [3]. As stated by most experimental work, cation mobility occurs in the amorphous phase and its diffusion occurs through a complex mechanism involving the PEO segmental mobility. Moderate conductivity in amorphous materials is a direct consequence of PEO features where high salvation is counterbalanced by the energetic complexation of cations. Suthanthiraraj et al reported enhancement in conductivity in silver based PEO polymer electrolytes due to incorporation of nano-fillers [4]. In the present work we intend to study the effect of silver salt concentrations in PEO-based polymer electrolytes by means of vibrational spectroscopy and complex impedance analysis
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