Chrystal structure properties of Al-doped Li₄Ti₅O₁₂ synthesized by solid state reaction method

This research aim is to analyze the effect of Aluminum (Al) doping in the structural properties of Al-doped Li₄Ti₅O₁₂ as anode in lithium ion battery. Al-doped Li₄Ti₅O₁₂ powders were synthesized by solid state reaction method. LiOH.H₂O, TiO₂, and Al₂O₃ were raw materials. These materials were milled for 15 h, calcined at temperature of 750^oC and sintered at temperature of 800^oC. Mole percentage of doping Al (x) was varied at x=0; x=0.025; and x =0.05. Al-doped Li₄Ti₅O₁₂ powders were synthesized by solid state reaction method. X-ray diffraction was employed to determine the structure of Li₄Ti₅O₁₂. The PDXL software was performed on the x-ray diffraction data to estimate the phase percentage, the lattice parameter, the unit cell volume, and the crystal density. Al-doped Li₄Ti₅O₁₂ has cubic crystal structure. Al-doping at x=0 and x=0.025 does not change the phase as Li₄Ti₅O₁₂ while at x=0.050 the phase changes to the LiTiAlO₄. The diffraction patterns show that the angle shifted to the right as the increase of x which indicated that Al substitute Ti site. Percentage of Li₄Ti₅O₁₂ phase at x=0 and x=0.025 was 97.8% and 96.8%, respectively. However, the lattice parameters, the unit cell volume, and the crystal density does not change significantly at x=0; x=0.025; and x=0.050. Based on the percentage of Li₄Ti₅O₁₂ phase, the Al-doped Li at x=0 and x=0.025 is promising as a lithium battery anode.