Solid polymer electrolytes offer potential improvements to lithium ion batteries that include extending their operating temperature range and improving the safe use of the batteries by inhibiting lithium dendrite formation. Because solid polymer electrolytes replace traditional liquid electrolytes as the lithium ion transport medium and also act as the electrode separator, these materials must offer good ionic conductivity along while providing good interfacial contact with the electrode material. This work presents the synthesis and characterization of phosphonium ionene polymers with bis(trifluoromethane)sulfonimide (TFSI) counterions. Ionenes are a class of polycation that includes positive charges within the polymer backbone. Because the positive charge is a part of the polymer chain, the spacing and distribution of these charges have a significant impact on the properties of ionenes. This research focuses on determining the role of charge spacing and distribution of charges along the backbone of phosphonium ionenes on their ability to transport lithium ions.

Solid polymer electrolytes for all-solid-state lithium ion batteries based on phosphonium ionenes

2019 Spring National Meeting

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