Powder characterization and electrochemical properties of LiNi 0.5 Mn 1.5 O 4 cathode materials produced by large spray pyrolysis using flame combustion

Abstract

LiNi0.5Mn1.5O4 cathode materials were produced by spray pyrolysis apparatus using the flame combustion. SEM revealed that as-prepared powders had spherical morphology with porous microstructure which had an average diameter of about 2m with broad size distribution. After the calcination, LiNi0.5Mn1.5O4 powders with polygonal morphology and narrow particle size distribution were obtained. XRD showed that LiNi0.5Mn1.5O4 was well crystallized after the calcination at 900()C. Rechargeable measurement of LiNi0.5Mn1.5O4 cathode showed that the long plateau was observed at 4.7V in discharge curve of LiNi0.5Mn1.5O4 cathode and its discharge capacity was 145mAh/g at 1C. The capacity retention of LiNi0.5Mn1.5O4 cathode were 95 at 1C after 100cycles. The discharge capacity and capacity retention of LiNi0.5Mn1.5O4 cathode were 125mAh/g and 88 at 20C. LiNi0.5Mn1.5O4 cathode exhibited also stable cycle performance at 50 °C. Copyright © 2011 Shinsuke Akao et al.