Investigation of supersonic-wave treatment effect on LiNi_0.60Co_0.22Mn_0.18O₂ as a cathode material of Li ion battery

Abstract

The electrochemical properties and crystal structure of LiNi 0.60 Co 0.22 Mn 0.18 O 2 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 (TEM-EDX) and synchrotron powder XRD. Furthermore, the supersonic-wave bath solution was characterized by pH measurements. The electrochemical properties and crystal structure of LiNi 0.60 Co 0.22 Mn 0.18 O 2 treated with supersonic-waves in a Zn-containing C 2 H 5 OH solution did not change from pristine. On the other hand, Zn 2+ was partially substituted in the LiNi 0.60 Co 0.22 Mn 0.18 O 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 H 2 O from the LiNi 0.60 Co 0.22 Mn 0.18 O 2 . This suggests that Li defects are the initial points of Zn substitution by the supersonic-wave treatment.