Solid-state polymer electrolytes for lithium-ion batteries have attracted considerable research interest because of the potential for high safety and electrochemical stability, but applications are limited by their low ionic conductivities. Recently, artificial intelligence simulation found that aromatic polymers with dopants could achieve enhanced lithium ionic conduction at room temperature. Meanwhile, certain organic crystals could present high conductivity through a similar charge-transfer system. In our work, we have fabricated small organic crystalline electrolytes composed of a pair of charge-transfer complex matrix with different molar ratios of lithium salt. With the intention of studying the charge transport mechanism, this type of mixed ionic-electronic conductor is modeled via an equivalent circuit to decouple the ionic and electronic conduction. We find that the varying composition and thermal history can impact the relative ionic and electronic contributions to the bulk conductivity simultaneously. Contradictory to the conventional solid-state polymer electrolytes with the mechanism of lithium-ion transport in the amorphous polymer region through segmental motion, this type of electrolyte is found to facilitate the fast decoupled ion transport within a wide operation temperature window in the solid state containing crystalline organic complexes.

Solid organic charge-transfer crystalline composites as lithium-ion battery electrolytes

Where thousands of chemistry professionals meet to share ideas and advance scientific and technical knowledge. Spring 2023 abstracts, posters, and presentations will launch at the end of March.

ACS Spring 2023

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.