Solid block copolymer electrolytes for lithium batteries, comprising a polyethylene oxide (PEO) ion-conducting block and a polystyrene (PS) structural block mixed with lithium bistrifluoromethanesulfonylimide (LiTFSI) salt have been deeply studied in the past. However, transport of lithium ions in these electrolytes results in concentration over potentials during battery operation due to low cation transference numbers. Following the pioneering work of Armand and coworkers, a series of single-ion conducting block copolymer electrolytes have been synthesized where the TFSI anion is covalently bound to the PS backbone (EOS-LiTFSI). The transport of the lithium ion is studied by ac impedance spectroscopy while the morphology is studied by small angle X-ray scattering. We demonstrate an unexpected relationship between charge transport and morphology in these systems. 

Ionic transport and phase behavior in single-ion-conducting block copolymer electrolyte for lithium batteries

248th National Meeting (2014)

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