POS6-0228
Suppressing Parasitic Reactions in Lithium Metal Batteries via an In-Situ Single-Ion Polymer Coating
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Susung Yun (Korea Advanced Institute of Science and Technology)
Co-Author(s)
Abstract
Lithium metal batteries (LMBs) suffer from severe parasitic side reactions and uncontrolled dendrite growth induced by conventional liquid electrolytes. Particularly, the migration of PF6- anions toward the lithium anode accelerates electrolyte decomposition, forming an unstable, resistive solid-electrolyte interphase (SEI). To address these issues, we report an in-situ coating strategy to construct a conformal single-ion conducting polymer protective layer (SIPL) directly on the lithium metal surface. The immobilized anionic moieties within the polymer backbone effectively block PF6- anion penetration via electrostatic repulsion, fundamentally suppressing anion-induced side reactions. Concurrently, the single-ion framework delivers a high lithium-ion transference number, ensuring homogeneous lithium plating/stripping. Consequently, the modified lithium anode demonstrates significantly enhanced cycling stability and dendrite-free morphology in symmetric cells, as well as outstanding capacity retention in NMC full-cells. This work highlights a robust interfacial engineering strategy for high-energy-density and long-lifetime LMBs.
