چكيده به لاتين
Li-ion batteries due to properties like the high energy density, high cycling stability performance and, etc, it has attracted a lot of attention. The three main parts of the Li-ion battery are the anode, cathode, and separator. Various materials have been used as anode active material in Li-ion batteries. Today, lithium titanate with various stoichiometric ratios due to high cyclability, high rate performance, and high safety is taken into consideration. A member of this family is Li4Ti5O12 (LTO) that, in this work synthesized with the solid-state process and improved with F- . The F- with various ratios (X= 0.1, 0.2, 0.3, and 0.4) was doped in the structure of LTO that among these samples, Li4Ti5O11.7F0.3 have the best result. Structural and morphological features of samples was studied with X-Ray diffraction (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDS) and Brunauer–Emmett–Teller (BET) tests. The electrochemical properties of samples were studied with charge-discharge, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) tests. The capacity retention of LTO and LTOF0.3 after 100 cycles at 1C is 90.77% and 96.28% respectively. The LTO and LTOF0.3 were tested with EIS that the resistance of LTOF0.3 was less than the LTO.
