Structure and electrochemical performance of spinel LiMn1.95Ni0.05O3.98F0.02 coated with Li-La-Zr-O solid electrolyte

LiMn_1.95Ni_0.05O_3.98F_0.02 octahedral particles with lithium-ion solid electrolyte Li₇La₃Zr₂O₁₂ (LLZO) coating are prepared by a Pechini method. The relationship between the structure and electrochemical performance of the modified samples is investigated. As revealed by X-ray diffraction and scanning electron microscope, LLZO coating does not change the cubic spinel crystal structure of the pristine matrix (space group $ Fd\overline{3}m $ ). Moreover, the LLZO coating materials exist as nanosheets or nanoparticles. The morphology of the coating varies as the weight percentage increases from 1.0 to 3.0. LiMn_1.95Ni_0.05O_3.98F_0.02 coated with 2.0 wt% LLZO exhibits better cycle performance and rate capability at elevated temperature (i.e., 55 °C), while the coating exists as distinct reticulation covering the surface.