PEO-based polymer blend electrolyte for composite structural battery

• Published in: Polymer-plastics technology and engineering Vol. 62; no. 8; pp. 1019 - 1028
• Main Authors: Gucci, Francesco, Grasso, Marzio, Shaw, Christopher, Leighton, Glenn, Veronica Marchante Rodriguez, Brighton, James
• Format: Journal Article
• Language: English
• Published: New York Taylor & Francis Ltd 24-05-2023
• Subjects: Blending effects; Composition; Ductility tests; Electrochemical impedance spectroscopy; Ion currents; Lithium; Mechanical analysis; Mechanical tests; Polyethylene oxide; Polymer blends; Polysulfone resins; Room temperature; Strain
• ISSN: 0360-2559; 1525-6111
• DOI: 10.1080/25740881.2023.2180391

High mechanical strength and ionic conductivity of solid-state electrolyte (SSE) are currently conflicting targets that are very difficult to achieve. Polyethylene oxide (PEO) is one of the most common polymers adopted for SSE because of its very high ionic conductivity, but its mechanical strength is very low. This work discusses the manufacturing and testing of PEO blends using polysulfone (PSf) and Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) to assess the mechanical response under microtensile testing and the ionic conductivity with electrochemical impedance spectroscopy (EIS). Mechanical tests demonstrated a beneficial effect of LiTFSI with significant increase in maximum stress and ductility measured as strain at failure. The blending of PEO and PSf showed promising conductivity values at room temperature with the 90–10 PEO-PSf composition achieving the highest value (1.06 × 10−6 S/cm) and for the 70–30 composition achieving the highest maximum stress (3.5 MPa) with a conductivity of 3.12 × 10−7 S/cm.