Synthesis and characterization of polyphosphazene electrolytes including cyclic ether side groups
Document Type
Article
Date of Original Version
4-30-2018
Abstract
This paper presents the synthesis and detailed characterization of two polyphosphazene based polymers, including different cyclic ether side groups. The final polymers were obtained by a well-known method employing a living cationic polymerization and subsequent nucleophilic substitution. The synthesized polymers Poly [(1,3-dioxane-5-oxy) (1,3-dioxolane-4-methoxy)phosphazene] (DOPP) and Poly[bis(2-Tetrahydro-3-furanoxy)phosphazene] (THFPP) were mixed with varied amounts of lithium bis(trifluoromethane)sulfonamide (LiTFSI) and the interactions between the salt and the polymer chains were studied by Fourier transform infrared (FT-IR) and differential scanning calorimetry (DSC) measurements. Electrochemical characterization was performed by electrochemical impedance spectroscopy (EIS) and direct current polarization in the temperature range of 20–60 °C. These measurements were utilized to calculate the lithium transference number (t+), the lithium conductivity (σ) and its activation energy in order to elucidate the lithium transport behavior. Relatively high lithium transference numbers of 0.6 (DOPP) and 0.7 (THFPP) at 60 °C are found and reveal maximum lithium conductivities of 2.8·10−6 S⋅cm−1 and 9.0·10−7 S⋅cm−1 for DOPP and THFPP at 60 °C, respectively.
Publication Title, e.g., Journal
Journal of Power Sources
Volume
384
Citation/Publisher Attribution
Fiedler, Carsten, Bjoern Luerssen, Brett Lucht, and Juergen Janek. "Synthesis and characterization of polyphosphazene electrolytes including cyclic ether side groups." Journal of Power Sources 384, (2018): 165-171. doi: 10.1016/j.jpowsour.2018.02.055.
