Hydrothermal synthesis of Zn-doped Li_4Ti_5O_(12) with improved high rate properties for lithium ion batteries

摘要

Hydrothermal method has been successfully used to synthesize a spheroidic zinc doped Li_4Ti_5O_(12) (Li_(3.95)Zn_(0.05)Ti_5O_(12)) with large specific surface area. X-ray diffraction (XRD) and scanning electron microscope (SEM) are used to characterize the structure and morphology. The electrochemical properties are measured by the galvanostatic method and the results demonstrate that the Li_4Ti_(3.95)Zn_(0.05)O_(12) has a large discharge capacity of 182.45 mAh/g at 0.1C. With the favorable transport channel caused by the doped Zn~(2+), the Li_(3.95)Zn_(0.05)Ti_5O_(12) exhibits an enhanced high rate capacity of 122.38 mAh/g and better cyclic stability at 10C, which is promising for application in lithium ion batteries.