2014 : Kinetic of lifepo4 formation using non-isothermal thermogravimetric analysis

Prof.Dr.Ir. Sugeng Winardi M.Eng
Prof.Dr.Ir. Heru Setyawan M.Eng.
Dr.Eng Widiyastuti ST., MT.


Abstract

The formation reaction of LiFePO4 from decomposition of precursors LiOH, FeSO4. 7H2O and (NH4) 2HPO4 with mole ratio of Li: Fe: P= 1: 1: 1 was investigated. The experiment was carried out by thermogravimetric differential thermal analysis (TG-DTA) method using nitrogen as atmosphere at a constant heating rate to obtain kinetic constant parameters. Several heating rates were selected, viz. 5, 7, 10, 15, 17.5, 22.5 and 25 C min-1. Activation energy, pre-exponential factor and reaction order were taken using Kissinger method and obtained 56.086 kJ/mol, 6.95� 108 min-1, and 1.058, respectively. Based on fitting result between reaction model and experiment were obtained that reaction obeyed the three dimension diffusion model.© 2014 BCREC UNDIP. All rights reserved