Li_4Ti_5O_(12)纳米片的合成及储锂性能研究

Preparation and Electrochemical Behavior of Li_4Ti_5O_(12) Nanosheets as Anode Material for Lithium Ion Battery

以无定形的水合二氧化钛为前驱物,水热法合成了200～400nm大小的Li4Ti5O12纳米片作为锂离子电池负极材料.XRD(X射线衍射)、SEM(扫描电子显微镜)和TEM(透射电镜)分析表征样品的物相结构、表观形貌;循环伏安、充放电循环和电化学交流阻抗技术分别测定该纳米Li4Ti5O12在有机电解液和室温离子液体S114TFSI电解液中的电化学性能.结果表明,该材料具有较高的放电容量和良好的循环性能,有望成为锂二次电池新型负极材料.

Spinel lithium titanate （Li4Ti5O12 ） nanosheets with a size range of 200 -400 nm were synthesized by hydrothermal process from the amorphous hydrous titanium oxide precursors. The as-prepared products were characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEN）. The electrochemical behaviors of Li4Ti5O12 electrode in conventional organic electrolyte and ionic liquid electrolyte were investigated by using cyclic voltammetry, galvanostatic charge-discharge and AC im- pedance techniques. The experimental results indicate that the as-prepared nanostructured Li4Ti5O12, evaluated as anode material, exhibited good reversibility and cycle performance. It is expected to be a potential anode material for commerieal battery applications.