Synthesis and Characterization of Li_4Ti_5O_(12) Doped by Na and Al as Anodes Material for Li-Ion Batteries

摘要

Li_4Ti_5O_(12) pure and Li_4Ti_5O_(12) with Na and Al doped Li_(3-x/3))Al_xNaTi_(5-2x/3))O_(12) (x=0, 0.025, 0.05, 0.075) as anodes for Li-ion batteries are synthesized at 850°C via solid state reaction using Li_2CO_3, TiO_2-anatase, Al_2O_3 and Na_2CO_3 as precursor. The effect of substitution of Al and Na in Li_4Ti_5O_(12) on characterization of precursor and electrochemical performance is studied. It is found that Na doped in Li_4Ti_5O_(12) pure affected the formation of three phase i.e NaLiTi_3O_7, Li_4Ti_5O_(12), dan Li_2TiO_3. Meanwhile, Al doped contributed to the formation of NaLiTi_3O_7 phase significantly. The SEM images show that the particles have polyhedral shape with uniform size distribution. Na doped in the Li_4Ti_5O_(12) affected particle size become larger against Al doped particle size become smaller than undoped material, the best particle size measured by PSA is 30,89 . All characterization of material will determine the electrochemical performance of Li-ion battery.