Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

SYLI: Symposium Interfacial Challenges in Solid-State Li Ion Batteries

SYLI 7: Hybrid and structured electrolytes

SYLI 7.1: Vortrag

Mittwoch, 22. März 2017, 11:45–12:00, IFW A

Morphology and conductivity of nanohybrid block copolymer electrolyte for lithium-ion batteries — •Ezzeldin Metwalli, Maximilian Kaeppel, Simon Schaper, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Polymer electrolyte membranes are promising alternatives to conventional liquid electrolytes in lithium-ion batteries [1]. A key challenge is to achieve a highly ionic conductive solid-state polymer membrane that maintains high-modulus, toughness, and chemical stability. The ionic conductivity in relation to the morphology of a ternary system composed of polystyrene-block-polyethylene oxide (PS-b-PEO) diblock copolymer (DBC) electrolyte, lithium salt and ionic liquid (IL) was investigated. An optimized functional morphology of the hybrid membrane was achieved by enabling highly interpenetrated hard PS and soft PEO/IL domains. The high-modulus glassy PS domain of the nanostructured hybrid membranes offers mechanical stability, while the Li-containing PEO/IL hybrid domain enables the requisite high ionic conductivity. The IL doping enhances the solubilization of the undissociated lithium salt at the PS/PEO domain interface. The pronounced conductivity enhancement of the current Li-ion/IL/DBC hybrid electrolyte compared to other previously reported DBC electrolyte systems is discussed. [1] E. Metwalli et al., ChemPhysChem 2015, 16, 2882.