The Effect of Liquid Medium on Silicon Grinding and Oxidation during Wet Grinding Process

Abstract

The influence of a liquid medium duringa wet-milling process in the grinding and oxidation of silicon powder was investigated. Distilled water, dehydrated ethanol and diethylene glycol were used as the liquid media. The applied grinding times were 0.5, 3, and 12 h. Ground silicon powder samples were characterized by means of aparticle size analysis, scanning electron microscopy(SEM), xray powder diffraction (XRD), FT-IR spectroscopy and by a chemical composition analysis. From the results of the characterization process, we found that diethylene glycol is the most efficient liquid medium when silicon powder is ground using a wet-milling process. The FT-IR results show that the Si-O band intensity in an unground silicon powder is quite strongbecause oxygen becomes incorporated with silicon to form SiO 2 in air. By applying deionized water as a liquid medium for the grinding of silicon, the SiO 2 content increased from 4.12% to 31.7%. However, in the cases of dehydrated ethanol and diethylene glycol, it was found that the SiO 2 contents after grinding only changed insignificantly, from 4.12% to 5.91% and 5.28%, respectively.

Simple Synthesis and Characterization of Ball Milled SiOx for Use as a Negative Electrode Material

“…Milling without adding oxygen content can also be done by conscious choice of milling solvent, such as anhydrous ethanol. 21 The method resulted in controlled oxygen contents between ⩽ ⩽ x 0 1.7. Synthesis method two uses a custom modified roller mill setup as shown in Fig.…”