Preparation of High-rate Performance Li_4Ti_5O_(12)/C Anode Material in Li_4Ti_5O_(12)/LiFe_(0.5)Mn_(0.5) PO_4 Batteries

摘要

In this study, a V-doped Li_4Ti_5O_(12)/C (LTO/C) anode material is prepared using a solid-state method. Furan resin and vanadium are employed to metal dope and carbon coat LTO, respectively. To prepare LiFe_(0.5)Mn_(0.5)PO_4/C (LFMP/C) cathode materials, a ball-milling method is used to induce a solid-state reaction by using polystyrene and citric acid as a carbon source and complexing agent, respectively. The characteristic properties of the samples are examined using X-ray diffraction (XRD), micro-Raman spectroscopy, scanning electron microscopy (SEM), and the AC impedance and galvanostatic charge-discharge methods. Finally, an LTO/LFMP full cell is constructed and examined. The full cell exhibited discharge capacities of 161, 152, 141, 123, 111, and 84 mAh g~(-1) at 0.2, 0.5, 1,3, 5, and 10C, respectively, showing that both the Li_4Ti_(4.95)V_(0.05)O_(12)/C anode and LFMP/C cathode are potential candidates for application in high-power Li-ion batteries.