Polymeric Bridge-assisted Dielectric BaTiO3 Coating for Stable and Enhanced Electrochemical Properties of Li-rich Layered Oxides

Due to their superior energy density, Li-rich layered oxides (LLOs) have emerged as potential cathode materials for future lithium–ion batteries (LIBs). However, critical challenges that hinder their commercialization include oxygen release and low Li–ion mobility. In this study, a uniform dielectric BaTiO₃ (BTO) coating, utilizing PVP as a polymeric bridge, was designed to suppress oxygen release and enhance Li–ion mobility. The dielectric BTO layer creates a reversed electric field within the battery, which effectively mitigates oxygen release while simultaneously enhancing Li–ion mobility. We observed a superior initial Coulombic efficiency (ICE) of 1 wt.% BTO-coated LLO (BTO1) at 89.58% (0.1 C) and rate performance of 132.02 mAh·g⁻¹ (10 C), compared to the pristine sample. This study demonstrates the importance of uniform dielectric coating and further proposes a novel approach to enhance the performance of LLO.