Traditional polymer electrolytes for lithium-ion transport exhibit coupling between segmental relaxation and ionic conductivity. We introduce a novel polymer electrolyte system where the ionic-aggregate phase acts as a disordered glass matrix towards the development of segmental relaxation-decoupled, fast lithium-ion transport. The polymer- LiPSC10TFSI contains a polystyrene backbone with 10 methylene spacers between it and the tethered -TFSI- anion. It has a layered phase separation of the ionic phase with a distance of 3.1 nm. The motion of Li+ in the ionic-aggregate phase at varying timescales are studied by NMR spin-lattice relaxometry at both laboratory and rotating frame of reference, respectively. It is found that the short-range motion is characterized by a T1 spin-lattice relaxation with an activation energy of 0.14 eV which is lower than a lot of the superionic glass conductors. In the meantime, the long-range time constant T1 has an activation energy of 0.65 eV. We will compare the outcomes of the NMR measurements with DC conductivity and dielectric measurements in the impedance frequency range. In this contribution, we will also discuss strategies to improve the ionic conductivity in the ionic-aggregate system.

Investigation of Li+ dynamics and conductivity in ion-condensed polymer electrolytes

Fall 2022 abstracts, posters, and presentations will launch in mid-September.

ACS Fall 2022

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