Lithiated Polyethylene Terephthalate as a Polymer Electrolyte Membrane with High Li-ion Conductivity for Advanced Lithium Batteries
نویسندگان
1 Department of Semiconductors, Materials and Energy Research Center (MERC), P.O. Box: 14155/4777, Tehran, Iran
2 Department of Chemistry, Payame Noor University, P.O. Box: 19395-3697 Tehran, Iran
3 Department of Semiconductors, Materials and Energy Research Center (MERC), P.O. Box: 14155/4777, Tehran, Iran
4 Department of Ceramics, Materials and Energy Research Center (MERC), P.O. Box: 14155/4777, Tehran, Iran
doi
10.22036/pcr.2024.463573.2542چکیده
Lithiated polyethylene terephthalate (PET) is a new type of polymer electrolyte membrane as a separator for Li-ion batteries. By incorporating lithium ions into the PET structure, lithiated- PET can enable the transport of lithium ions while blocking the passage of electrons, thereby acting as a selective separator in a battery. Here, H-PET is swollen by two lithium precursors of LiOH and LiI with two concentrations. Lithium incorporation is revealed by XRD and FTIR analyses. Impedance spectroscopy shows that lithiated PET by LiI salt exhibits a bulk ion conductivity of 7.79 × 10-5 S cm-1 at 25 °C and 6.15 × 10-4 S cm-1 at 120 °C. The mechanism of Li-ion migration in Li-PET is based on the movement through the oxygen in the ester functional groups. When the ionomer of PET is phonon-activated under the temperature, segmental movement of ionomers and local dis-orderings enhance the Li-ion conductivity. Therefore, Li-PET as a lightweight polymer electrolyte can be a suitable replacement for the standard liquid electrolyte/separator systems in advanced lithium batteries.
