POS6-0192
Highly Adhesive, Fluorine-Free Binders Enabled by Chemical Anchoring for Durable High-Nickel Cathodes in Lithium-Ion Batteries
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Seunghyeon Kim (Seoul national university)
Co-Author(s)
Abstract
High-nickel cathodes in high-energy-density lithium-ion batteries require high-voltage stability and lean binder content. Conventional poly(vinylidene fluoride) exhibits poor adhesion and environmental concerns as per- and polyfluoroalkyl substances. We propose a fluorine-free polynorbornene-based terpolymer binder featuring a novel chemical anchoring mechanism. This binder undergoes an in-situ ring-opening reaction with the cathode surface, forming covalent ester linkages that enhance mechanical adhesion and enable stability at 2 wt% binder content. This anchoring facilitates 4.5 V operation by forming a protective layer that suppresses interfacial degradation. Post-mortem analyses show that the binder network suppresses layered-to-rock-salt phase transitions and captures dissolved transition metals to inhibit cross-electrode degradation. This work establishes covalent chemical anchoring as a design principle for sustainable, high-performance binders in next-generation batteries.
