Li_4Ti_5O_(12)的合成及其性能研究

Study on synthesis and properties of Li_4Ti_5O_(12)

用固相法制备了尖晶石Li4Ti5O12,采用X射线衍射(XRD)对样品进行了表征。采用恒电流充放电、循环伏安法(CV)、电化学交流阻抗频谱(EIS)技术对Li/Li4Ti5O12体系进行电化学性能测试。首次放电比容量达到163.1mAh/g,库仑效率达97.5%。经过60次充放电循环之后,容量衰减仅为4.4%。结果表明,Li4Ti5O12是一种循环性能优良的锂离子蓄电池负极材料,可改善锂离子蓄电池的安全和循环性能。

Spinel Li4Ti5O12 was prepared by solid-state reaction method, and was characterized by XRD. The system of Li/Li4Ti5O12 was tested by constant current charge-discharge, cyclic voltammetry （CV）, electrochemical impedance spectrum （EIS）. The initial discharge capacity was 163.1 mAh/g and coulombic efficiency reached 97.5%. The capacity declined only by 4.4% after 60 cycles. The results show that Li4Ti5O12 is a kind of anode material with better cycling performance for lithium-ion battery and can be used to improve the safety and cyclicity of lithium-ion battery.