Li_1.5Al_0.5Zr_1.5(PO₄)₃-coated Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode materials with high lithium-ion diffusion rate and long cycling stability for lithium-ion batteries

Lithium rich-layered oxides have attracted widespread attention due to their high specific capacity and high energy density. However, severe lithium nickel mixing, poor lithium-ion migration rate, and surface side reactions greatly limit their development. Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ with different contents of Li_1.5Al_0.5Zr_1.5(PO₄)₃ (LAZPO-LMNCO) is synthesized by wet chemistry and high-temperature solid-phase method. Fast lithium-ion conductor LAZPO coating effectively suppresses side reactions between the electrolyte and LMNCO surface and stabilizes the layered structure, which reduces lithium nickel mixing and increases the migration rate of lithium ions, thereby improving cycling stability. Lithium-ion diffusion coefficient of 3 wt% LAZPO-LMNCO electrode reaches 5.8 times that of pristine LMNCO. At 1C, the 3 wt% LAZPO-LMNCO electrode provides a capacity retention rate of 90.4% after 250 cycles, compared to 82.8% of LMNCO after 100 cycles. Even a high rate of 5C, it still maintains a capacity retention rate of 88.4% after 350 cycles. This work provides an effective method for reducing surface side reactions and improving electrochemical performance of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂.