EFFECT OF TEMPERATURE VARIATION ON CONDUCTIVITY VALUE OF CATHODE LITHIUM FERRO PHOSPHATE CARBON COMPOSITE

  • METATIA INTAN MAULIANA Universitas Negeri Surabaya
  • NURIL LUTVI Universitas Negeri Surabaya
Keywords: iron rock, Cathode, solid-state reaction, LFP/C

Abstract

The lithium ferro phosphate carbon composite (LFP/C) cathode material has been successfully synthesized using solid-state reaction method by utilizing one of the natural source of Kalimantan Sea Borneo rock as the base material of Fe. Solid state reaction method is done by using high energy ball milling tool. The LFP cathode material was prepared using a base material (Li2CO3), Fe3O4, and (NH4)2HPO4 in a ratio of 3: 6: 2 and 5% wt. Citric acid as a carbon source. In this study used variations of calcination temperature under inert conditions at 400 ° C, 500 ° C, 600 ° C, and 700 ° C to determine the effect on the phase structure and electrical conductivity produced by LFP / C cathode composites. Characterization of phase structure was done by using X-ray powder diffraction (XRD), while the conductivity value of the sample was tested using Electrochemical Impedance Spectroscopy (EIS). The analysis of the diffraction pattern shows the largest composition of olivine structure formed at 700 ° C at 93.3 wt% with Fe2O3 impurities of 6.7 wt%. In addition, the impurities that arise at other temperatures are monoclinic Li2FeP2O7, but the impurities phases are reduced as the calcination temperature increases. The highest conductivity value of LFP / C is shown by sampling with 500 ° C calcination temperature with total conductivity value of 5,676 x 10-3 S.cm-1.

Published
2018-10-27