Enhanced electrochemical performance of LiMn₂O₄ cathode with a Li₀.₃₄La₀.₅₁TiO₃-coated layer

Spinel cathode materials consisting of LiMn₂O₄@Li₀.₃₄La₀.₅₁TiO₃ (LMO@LLTO) have been synthesized by a new and facile solid-phase route in air. When used as cathode for lithium ion batteries, the LLT01 (LiMn₂O₄ with 20 nm Li₀.₃₄La₀.₅₁TiO₃ coating) sample tested at 1 C rate exhibits 9.2% capacity loss and 90.4% capacity retention after 200 cycles at 25 °C and 55 °C. The improved cycling performance of composites is attributed to the LLT01 coating on the surface of spinel particles. The polycrystalline LLTO-coated layer could provide superior ionic conductivity and prevent Mn dissolution in electrolyte during electrochemical cycling.