Investigation of supersonic-wave treatment effect on LiNi0.60Co0.22Mn0.18O2 as a cathode material of Li ion battery

Abstract

The electrochemical properties and crystal structure of LiNi 0.60Co0.22Mn0.18O2 treated by supersonic-waves in a Zn-containing solution were investigated by performing chargedischarge tests, X-ray diffraction (XRD), an inductively coupled plasma (ICP) analysis, scanning electron microscopy (SEM), transmission electron microscopy, energy dispersive X-ray spectroscopy (TEMEDX) and synchrotron powder XRD. Furthermore, the supersonic-wave bath solution was characterized by pH measurements. The electrochemical properties and crystal structure of LiNi 0.60Co0.22Mn0.18O2 treated with supersonic-waves in a Zn-containing C2H5OH solution did not change from pristine. On the other hand, Zn2+ was partially substituted in the LiNi0.60Co0.22Mn0.18O 2 treated with supersonic-waves in a Zn-containing aqueous solution. As a result of the ICP analysis of the supersonic-wave-treated samples and pH measurement of the supersonic-wave bath, the Li was dissolved in the supersonic-wave bath which contained H2O from the LiNi 0.60Co0.22Mn0.18O2. This suggests that Li defects are the initial points of Zn substitution by the supersonic-wave treatment. © 2012 The Ceramic Society of Japan.