Decoration by dual-phase Li₂ZrO₃ islands with core–shell structures enhances the electrochemical performance of high-voltage LiNi_0.5Mn_1.5O₄ Available to Purchase

A high-voltage LiNi_0.5Mn_1.5O₄ (LNMO) cathode was modified by Li₂ZrO₃ (LZO), a fast ion conductor with a unique core–shell crystalline-amorphous structure. The electrochemical results indicated a greatly improved capacity retention for LNMO-1LZO compared to LNMO. Moreover, the rate performance (100 mAh·g⁻¹) of LNMO-1LZO at a high current density of 10 C was superior to those of pristine LNMO and other modified samples. The enhanced electrochemical performance was ascribed to the generation of dual-phase island-shaped LZO with an interior crystalline phase, which accelerated Li⁺ diffusion, and an exterior amorphous shell, which enhanced interfacial compatibility and stability without influencing the intrinsic spinel structure of bulk LNMO. Thus, modification with this hybrid material has the remarkable synergetic effect of enhancing interfacial Li⁺ diffusion and stabilizing the interfacial structure during cycling.