Rational design of the electrode-electrolyte interphase is essential to stabilize the electrodeposition of reactive metals like lithium, irrespective of the nature of electrolyte (liquid or solid-state). Thus, it is important to design an artificial interfacial layer that can accommodate the stress generated due to the volume changes during battery operation and at the same time maintain ionic continuity. In our work, we design novel materials based on dynamic ionic bond polymer networks that can be used as a coating on metal anode for enhancing the electrochemical stability. IThe stabilization mechanism of the dynamic polymeric coatings is understood to arise from the spontaneous structural response of the polymer in response to the roughening electrode during electrodeposition. As the polymer coating is free to flow, if there is a ‘hotspot’ (uneven deposit) on the surface of the lithium metal, the dynamic polymer coating can rearrange and cover these regions resulting in increased overpotential, such that the successively Li+ ions deposit on the flatter regions resulting in a uniformity of deposition. In my talk, I will discuss the mechanics, microstructure, and 'self-healing properties' of these dynamic polymer networks and the relationship with their electrochemical functions.

Suppressing electrochemical instabilities of Li metal using a polymeric interface

ACS Spring 2022

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