lHydrothermal Synthesis and Electrochemical Performance of Spherical Li4Ti5O12 as Anode Material for Lithium-ion Secondary Battery

Self-made TiO2 with different particle sizes was adopted to react in LiOH solution via a fast hydrothermal process, from which spherical spinel lithium titanium oxide Li4Ti5O12 was efficiently prepared. In detail, precursor was obtained from hydrothermal reaction between TiO2 with 5 mol/L LiOH solution at 100 degrees C for 20 h, and Li4Ti5O12 was synthesized by calcining the precursor at 800 degrees C for 2 h. The mechanism of the hydrothermal process discussed show that an even Li -Ti -0 mixture is formed during Li cation diffusing into the TiO2, resulting in the structure conversion to pure Li4Ti5O12 fast at high temperature. While all the obtained Li4Ti5O12 with different particle sizes show stable electrochemical cycling ability, the 0.5 gm Li4Ti5O12 exhibits optimal electrochemical performance. Its initial discharge capacity reaches 158 mAh/g at 0.2 degrees C and more than 99% of capacity is retained after 70 cycles, while the reversible capability readily exceeds 125 mAb/g after 50 cycles at 0.2 Cat 50 degrees C.