Analysis of Lithium-ion Battery Materials Using a Portable Ultrahigh-vacuum Sample Transfer Vessel

Abstract

We analyzed the lithium-ion battery material LiNi_0.5Mn_1.5O₄ electrode using a portable vacuum transfer vessel. When investigating the chemical state of carbon by X-ray photoelectron spectroscopy, it is important that the battery material is not exposed to the atmosphere. In addition, it was found that when investigating the chemical state of fluorine, it is necessary to analyze not only the effect of the reaction with atmospheric components, but also the deterioration due to irradiation with the X-ray. When the sample is transported in an argon atmosphere for a long time, the oxygen concentration in the transfer vessel increases due to degassing from the sample and the vessel, and the sample surface becomes contaminated.