Structural Modification, Synthesis Mechanism and Properties Analysis of Li₄Ti₅O₁₂ Anode Materials

摘要

Li4Ti5O12 microsphere was synthesized by hydrothermal method. The effects of amount of lithium hydroxide, hydrothermal time and sintering temperature on properties of sample were studied. The synthesis mechanism of Li4Ti5O12 microsphere was preliminary analyzed. The structural characterization was analyzed by X-ray diffraction, and the morphology was investigated by scanning electron microscopy and transmission electron microscopy. The properties of galvanostatic charge, discharge and cycle stability were also studied. The results indicated that when 2.55 mmol LiOH?H2O reacted with 0.2 g hydrolysate, the sample had pure phase, when the hydrothermal condition was 36 h and 180 oC, the structure of sample particle was intactly spherical. The volume average size of samples were between 400 nm to 600 nm. The charge and discharge voltage plateau of samples were very stable. When the sintering temperature was 700 oC, the first discharge capacity was 148.3 mAh?g-1 at 0.1 C. After 10th cycle, the discharge capacity retained at 132.5 mAh?g-1.