Solvent‐Phobic and Ionophilic Carboxylated Polythiophene Layer for Fluoride‐Rich Cathode Electrolyte Interphase (Adv. Energy Mater. 22/2025)

Cathode Electrolyte Interphases

In article number 2406019 Elsa Reichmanis and co-workers offer a comprehensive understanding of poly[3-(potassium-4-butanoate)thiophene-2,5-diyl] (P3KBT) solvent-phobic | ionophilic behavior. P3KBT solvent-phobicity arises from dispersive, polar, and hydrogen-bonding interactions between P3KBT and electrolyte solvent. The ionophilic nature is driven by electrostatic interactions and reversible electrochemical (de)doping. When serving as an active material coating, P3KBT induces a LiF-rich, Li₂CO₃-limited cathode electrolyte interphase, significantly improving half-cell life.