Effect of Milling on the Electrochemical Properties of Nanostructured Li(Fe0.8Mn0.2)PO4 as Cathodes for Li-ion Batteries

  • Morteza Torabi 1Materials and Energy Research Center, P.O. Box 14155-4777, Tehran, Iran
  • Alireza Tavakkoli Neyshabouri Materials and Energy Research Center, P.O. Box 14155-4777, Tehran, Iran
  • Bahram Soltan Mohammad Malek-Ashtar University of Technology, P.O. Box 15875-1774, Tehran, Iran
  • S. H. Razavi Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran
  • Mansoor Kianpour Rad Materials and Energy Research Center, P.O. Box 14155-4777, Tehran, Iran

Abstract

Phospho-olivine Li(Fe0.8Mn0.2)PO4 was synthesized using high-temperature solid state procedure. Ball milling was used to decrease the particle size of the active material. X-ray diffraction (XRD) confirmed formation of the phospho-olivines. The crystallite size of the ball-milled particles was calculated about 64.9 nm. Scanning electron microscopy (SEM) also showed polygonal particles of the ball-milled Li(Fe0.8Mn0.2)PO4 and homogeneous distribution of the iron and manganese. Electrochemical evaluation of the ball-milled Li(Fe0.8Mn0.2)PO4 demonstrated faster kinetic reaction with respect to the as-synthesized Li(Fe0.8Mn0.2)PO4. The ball milling process led to highest capacity between the samples (150 mAh g-1 at 0.1 mA cm-2); however, annealing the ball-milled samples showed the best cyclic performance (3% fading after 50 cycles). Ball milling process caused nanostructured Li(Fe0.8Mn0.2)PO4 with lower diffusion length, higher electrical conductivity and higher capacity.

Author Biography

Morteza Torabi, 1Materials and Energy Research Center, P.O. Box 14155-4777, Tehran, Iran

2Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran
3Department of Chemical Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada

Published
2017-04-22
Section
Full Articles