dc.description.abstract | This study aimed to prepare spinel carbon-coated Li4Ti5O12 (LTO/C) via sol-gel reaction and
applied as a high-performance lithium-ion battery anode. The LTO powder was coated using
various carbon sources, super P (SP), sugar and PVDF-assisted SP. The crystal structure,
morphology, conductivity and electrochemical performance of the samples were examined
using X-ray diffraction (XRD), Field Emission scanning electron microscopy (FESEM),
Fourier Transform Infrared (FTIR) spectroscopy, Electrochemical Impedance Spectroscopy
(EIS) and Cyclic Voltammetry/Charge-discharge (CV/CD), respectively. The XRD analysis
results showed that the samples contain highly crystalline spinel LTO as the main phase and
rutile as impurity. The FESEM image showed that SP covers the entire LTO surface more
homogenous than sugar. However, sugar carbon makes roughness on the LTO surface. FTIR
spectra showed that the coating using sugar and PVDF still contain hydrocarbon element.
Electrochemical performance evaluations showed that SP carbon-coated-LTO possesses
higher lithium diffusion and specific capacity than pure LTO, while sugar-coated-LTO shows
the lowest specific capacity. Moreover, the SP carbon-coated-LTO sample high-rate
capability has improved during full cell evaluation, delivering a discharge capacity of 249,
231, 211, 194, 58, and 23 mAhg-1 at the charge or discharge current density of 0.05, 0.1, 0.5,
1, 5, and 10 C, respectively. | en_US |