一种新型的锂离子电池负极材料

New Lithium-ions Batteries Anode Material

在固相合成的Li4Ti5O12中添加SnO2进行改性。用循环伏安、交流阻抗谱、恒流充放电技术研究了SnO2的添加对材料的电化学性能影响。试验显示,材料改性后,当以金属锂为对电极时,首次放电容量达400.02mAh·g–1,首次库仑效率为50%;当以LiCoO2为对电极时,首次放电容量为166.27mAh·g–1,经过15次循环后,容量衰减仅为3.3%。改性后的电极材料不但提高了容量,而且能够保持原有材料的高循环性能,可用作锂离子电池的负极材料。

Li4Ti5Ot2 was prepared by solid state route, which was modified by additive of SnO2. The effects of SnO2 on the electrochemical properties of samples were characterized by cyclic voltammetry, electrochemical impedance spectroscopy and constant current charge-discharge. The results show that initial discharge capacity is 400.02 mAh·g^-1 with metal Li as the counter electrode and the initial coulombic efficiency is 50 %. When coupled with LiCoO2, the initial discharge capacity is 166.27 mAh·g^-1 and the capacity decreased only by 3.3 % after 15 cycles. The modified sample not only enhances the capacity, but also maintains the high cycling performance of Li4Ti5O12 All these indicate that the modified material can be used as anode of lithium-ion battery.