高加速度遊星ビーズミルを用いたチタン酸リチウム水和物の機械的液相合成

抄録

Mechanical synthesis of lithium titanate hydrate (LHTO: Li_1.81H_0.19Ti₂O₅·xH₂O) in liquid phase was investigated using a high centrifugal bead mill. The maximum centrifugal acceleration induced by the mill is 1000 G. LHTO is a precursor of lithium titanate (LTO: Li₄Ti₅O₁₂) which is an anode material for lithium-ion batteries. As starting materials, lithium hydroxide which was dissolved in water and titanium dioxide (TiO₂) nanoparticles were used. As bead media, 0.3, 0.5 and 1 mm diameter of zirconia beads were employed. In cases of 0.3 and 0.5 mm beads, the formation ratio of LHTO reached 90% by 60 min milling. Synthesis of LHTO proceeded in a short time. The LTO sample converted from the LHTO by 60 min milling with 0.3 mm beads contained less residual TiO₂ as compared with the sample of 0.5 mm beads. Coin-type cells were assembled using the converted LTO samples and electrode properties were evaluated.