Ion dynamics and positron annihilation studies on polymer ceramic composite electrolyte system (PVA/NaClO4/Y2O3): Application in electrochemical devices

This study aimed to develop a framework to investigate the structural, dielectric, and transport properties of a sequence-based PVA matrix polymer ceramic composite electrolyte system with sodium perchlorate (NaClO4) and yttrium oxide (Y2O3) as nanofillers. The XRD results revealed a change in crystallinity. Chemical interactions between the PVA/NaClO4 matrix and yttrium ions were revealed using FTIR studies. From SEM studies, the morphology was observed to be smoother, homogeneous, and coherent for the pure+salt PCCE system after addition of Y2O3 nanoparticles to the matrix. In Py3% system, the nanoparticles were randomly linearly aligned due to inter- and intramolecular bonding. The elemental composition and mapping were confirmed by the presence of Y2O3 and NaClO4 particles. For 7 wt%, 1 wt% Y2O3 nanoparticle loading (Py7%, Py1%) in the PCCE matrix, the positron lifetime parameters o-Ps lifetime (?3) and free volume size (Vf) showed a minimum (Py7%) and maximum value (Py1%). Between these two values, the value for Py3% was ascertained. It was found that Py3% was least crystalline with highest ionic conductivity 3.25 × 10?4 S/cm which is strongly influenced by the highest charge concentration (n), not its mobility (?). The highest conducting sample (Py3%) had an ion transference number (tion) of 0.919, indicating that the current system was ion-dominant with a small amount of electron participation. The LSV technique determined the potential window for the Py3% PCCE system to be 3 V, indicating that it could be used in energy storage applications. The proposed PCCE system's open circuit voltage was 1.7 V, and the discharge characteristics of a primary sodium battery built with a high-conductivity electrolyte system (Py3%) were thoroughly examined. To ensure the safety of our prepared energy storage systems, we tested films for flame retardancy and dimensional stability. Py3% film demonstrated considerable flame retardation that was stable over several ignitions. Self-extinguishing time for pure+salt displays ? 41 s g?1 whereas in the case of Py3% PCCE it has a value ? 6 s g?1.

» Author: Chetan Chavan, R.F. Bhajantri, Soumya Bulla, H.B. Ravikumar, M. Raghavendra, K. Sakthipandi, K. Yogesh Kumar, B.P. Prasanna

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This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737


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