Solvent-Cast Solid Electrolyte Membranes Based on a Charged Rigid-Rod Polymer and Ionic Liquids

• DOI: 10.1021/acsaem.0c03133
• Publication Date: 2021-06-30T16:58:14Z
• Authors: Deyang Yu; Curt J. Zanelotti; Ryan J. Fox; Theo J. Dingemans; Louis A. Madsen
• Keywords: 02 engineering and technology; 0210 nano-technology

Solid-state electrolytes are attractive for use in electrochemical devices because they remove the need a flammable liquid electrolyte while contributing to structural integrity of device. We have recently developed class solid electrolytes, termed molecular ionic composites (MICs), composed liquids (ILs) and rigid-rod polyelectrolyte, poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (PBDT). MIC materials, originally obtained through an ion-exchange process between IL PBDT aqueous solution, possess unprecedented combination high conductivity, thermal stability, low flammability, widely tunable tensile storage moduli. Here we present facile solvent casting method preparing membranes. These membranes uniform, flexible, tough, with composition thickness (≥40 μm). Unlike previous method, which only allowed incorporation hydrophilic ILs, can now incorporate hydrophobic ILs prepare for, example, battery electrolytes. A sodium (Na) metal symmetric cell constructed PBDT-Pyr14 TFSI membrane as shows long-term stable cycling (>500 h) at 60 °C. The ability MICs by using both initiates wider range materials broadens array applications accessible