Lithium ion batteries with small molecule organic electrolytes continue to be limited by safety issues related to their volatility and flammability as well as potential dendrite formation. This work focuses on the synthesis of single-ion solid polymer electrolytes through the use of ring-opening metathesis polymerization and click chemistry where the anion is covalently bound to the polymer so that ion conductivity is dominated by lithium ion motion. Graft through and graft to approaches are studied to build in the single ion content into homopolymers and copolymers. The two monomers have a consistent oxanorbornene dicarboximide backbone where one has a trifluoromethane sulfonimide side group attached via click chemistry and the other has an oligomeric ethylene oxide (OEO) side chain. The OEO content in the copolymer and length of the side chain allows for the tailoring of the glass transition temperature which may improve ion conductivity balanced with a reduction in the lithium content.

Optimizing the synthesis of single-ion conducting polymer electrolytes using graft through and graft to techniques via ring opening metathesis polymerization and click chemistry

ACS Spring Meeting 2021

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