钛酸锂负极材料的改性研究进展

Research progress of modifications of Li_4Ti_5O_(12) anode materials

尖晶石结构的钛酸锂作为锂离子电池负极材料,以其结构稳定和安全性高,一直以来引起人们的高度关注。但是由于钛酸锂本身电导率低,在大电流充放电过程中电极的极化非常严重,限制了其电化学性能的发挥。为了解决这些问题,人们做了大量的研究工作。介绍了钛酸锂在碳包覆、离子掺杂及金属复合改性方面的研究进展,详细阐述了碳源及不同位置离子掺杂对钛酸锂性能的影响,并对钛酸锂未来的研究方向和应用趋势进行了分析。

Spinel-type lithium titanate （Li4Ti5O12, LTO） has attracted great intention as anode material of lithium-ion batteries because of its structural stability and high safety. However, the electrochemical performance of LTO is hindered by its poor electronic conductivity, which makes the polarization of the electrode serious when charged/ discharged at high current densities. Various research works have focused on developing strategies to overcome the problem. The modifications of Li4TisO^2, such as carbon-coating, ion-doping and mixing with metal were summarized. The influence of carbon sources and ion-doping in different sites on the performance of Li4TisO12 was introduced, and the development trend of Li4TisO^2 was suggested.