New single lithium ion conducting polymer electrolyte derived from delocalized tetrazolate bonding to polyurethane

Abstract In this work, a new class of single Li-ion conducting polyelectrolytes (SLICPs) were skillfully synthesized from highly delocalized lithium tetrazolate, polyethylene glycols (PEGs) and diisocyanates. The chemical composition of SLICPs was confirmed by FT-IR, NMR and XPS, and the physical and electrochemical properties were investigated with XRD, SEM, DSC, TG, EIS, LSV, etc . The results showed that the related properties could be tailored using various diisocyanates and PEGs, and the SLICPs comprising PEG1000 exhibited higher ionic conductivities and Li + transference number. It was noted that the conductivity of SLICP prepared from isophorone diisocyanate, lithium tetrazolate and PEG 1000 (IPULi-1000) could be close to 1 × 10 −4  S cm −1 at 80 °C without uptake of any organic solvents. Besides, the polymer electrolytes could endure an oxidation potential up to 4.2 V (vs. Li + /Li), and the stable cycle (more than 200 cycles for Li/Li symmetric cell at 30 °C) indicated that the developed SLICPs were compatible with lithium electrode. Hence, the developed SLICPs were promising solid polymer electrolytes materials for Lithium batteries.