Ionic Conductive Binder Based on Fast Ion Conductor Interface Compatibilization for Lithium–Sulfur Batteries

Binders are the key components for maintaining the integrity of sulfur electrodes in lithium–sulfur batteries. However, the traditional insulating binders have a negative impact on the charge transfer within the electrodes, which is an important factor leading to the poor rate performance of lithium–sulfur batteries. Herein, an ionic conductive binder (LPABM‐d‐LATP) based on the interface compatibilization of fast ionic conductor is synthesized by in situ emulsion polymerization and lithiation neutralization. The modified Li1.3Al0.3Ti1.7(PO4)3 nanoparticles with double bonds (d‐LATP) are covalently bonded to the lithiated copolymer to form a core–shell structure, which enables LPABM‐d‐LATP binder to synergistically promote the migration of lithium ions, making the room‐temperature ionic conductivity of LPABM‐d‐LATP reaches 2.5 × 10−4 S cm−1. As a result, as‐assembled lithium sulfur battery based on the LPABM‐d‐LATP binder displays a specific capacity of 941 m Ah g−1 at a high rate of 4 C and a capacity retention of 80.1% after 200 cycles at 0.5 C. This ionic conductive binder can make remarkable improvement in the excellent electrochemical performance of lithium–sulfur batteries.