Pembuatan Material Anoda Lithium Titanate (Li4ti5o12 ) dan Studi Pengaruh Ketebalan Elektroda terhadap Performa Elektrokimia Baterai Ion Lithium

Abstract

The synthesis of Li4Ti5O12 and the study of electrode thickness effect on the electrochemical performance of lithium ion batteries has been carried out. Li4Ti5O12 powders were synthesized from raw materials LiOH.H2O and TiO2 via powder metallurgy method. Electrode sheet was made by mixed Li4Ti5O12powders with PVDF, AB and NN,DMAC solvents become sluury and coated into sheet on the Cu foil with variations in the thickness of 50μm, 80μm, and 120 μm. The electrode sheet was assembled into half-cell battery using a coin cell with metallic lithium as reference electrode and LiFP6 as electrolyte. Characterization included X-Ray Diffraction (XRD) to know crystal structure and phases, while elctrochemical performances were conducted by Electrochemical Impedance Spectroscop (EIS), Cyclic Voltammetry (CV) and Charge/Discharge (CD). XRD test showed that there are two phases formed, namely Li4Ti5O12 with cubic structure at 77.3% and rutile TiO2 with tetragonal crystal structure at 22.7%. EIS test showed that the highest conductivity of anode sheet is 3.66 x 10-5 S/cm at a thickness of 50 μm. While, CV results showed that thicker electrode sheet will increase intercalation and de-intercalation. From CD test showed that the layer thickness affects the value of the specific capacity, the thicker of electrode layer will decreases the value of specific capacity. The best capacity of battery cells are obtained in a layer thickness of 50 μm, with a charge capacity of 146.6 mAh/g and the discharge capacity of 146.09 mAh/g.