Achieving Uniform Ti/P Co‐Modifications for Optimized Li ⁺ Transport Kinetics of LiCoO ₂

Abstract Recently, the deteriorated Li ⁺ transport kinetics of LiCoO ₂ (LCO) due to the presence of uneven surface coatings and dopants has long puzzled researchers. Herein, by using the hydrolysis of tetrabutyl titanate (C ₁₆ H ₃₆ O ₄ Ti), the interaction between LCO and LiH ₂ PO ₄ is effectively regulated, constructing uniform Li ₃ PO ₄ deposit and Ti‐enriched rocksalt (RS) phase on the surface of TP‐LCO. The ultrathin Ti‐enriched RS phase can effectively stabliize the surface lattice oxygen and enhance Li ⁺ transport kinetics, suppressing the Co/O loss and structural collapse. Simultaneously, the uniformly distributed Li ₃ PO ₄ deposits serve as a substrate that facilitates the formation of the reinforced and P‐enriched cathode‐electrolyte interphase (CEI), ensuring the long‐term cycling structural stability. Benefiting from the synergistic effect of uniform bilayer structure, TP‐LCO presents a high capacity of 181.7 mA h g ⁻¹ at the current of 8 C in the TP‐LCO/Li cell, and a high capacity retention of 90.9% after 600 cycles at the current of 1 C in the TP‐LCO/graphite cell.