EFFECTS OF CALCINATION TIME ON MORPHOLOGY AND ELECTROCHEMICAL PERFORMANCE OF Li2FeSiO4 CATHODE
M. I. Ishak*, A. Mokhtar, M. A. Sulaiman, A. Mat, K. S Sulaiman, M. F. Rosle, A. H. Hashim, S. M. Hasanaly
AbstractEFFECTS OF CALCINATION TIME ON MORPHOLOGY AND ELECTROCHEMICAL PERFORMANCE OF Li2FeSiO4 CATHODE
- I. Ishak*, A. Mokhtar, M. A. Sulaiman, A. Mat, K. S Sulaiman, M. F. Rosle, A. H. Hashim, S. M. Hasanaly
Energy Materials Section, Advanced Materials Research Centre (AMREC), SIRIM Berhad, Lot 34, Jalan Hi-Tech 2/3, Kulim Hi-Tech Park,
09000 Kulim, Kedah, MALAYSIA.
The Li2FeSiO4 cathode material was prepared via a sol-gel method and subsequently heat treated at 600 O C for 10 and 20 hours in argon atmosphere. The structure and morphology of the prepared Li2FeSiO4 composite was characterized by means of X-Ray Diffractometry (XRD) and Field- Emission Scanning Electron Microscopy (FESEM). The morphological changes of the Li2FeSiO4 materials resulting from different calcination times strongly influenced the electrochemical performance of this cathode material. The Li2FeSiO4 which was calcined for 10 hours delivered the best electrochemical performance with a discharge capacity of 172 mAhg-1 when cycled between 1.5 and 4.8 V vs. Li/Li+. Particulate morphology observed from FESEM images showed that samples that were calcined for 10 hours have reduced agglomeration compared to that that was calcined for 20 hours. The larger surface area for reaction with Li+ improves the discharge capacity of the Li2FeSiO4 cathode material.
Keywords: Li2FeSiO4, sol gel, morphology, cathode