Material/element-dependent fluorescence-yield modes on soft X-ray absorption spectroscopy of cathode materials for Li-ion batteries

Daisuke Asakura,Jinghua Guo,David G Hawthron,Per-Anders Glans,Takashi Mizokawa,Yusuke Nanba,Haoshen Zhou,Andrew J Achkar,Jun Okabayashi,Chunmei Ban,Gang Chen,Thomas Z Regier,Hiroki Wadati,Eiji Hosono

doi:10.1063/1.4943673

Abstract

We evaluate the utilities of fluorescence-yield (FY) modes in soft X-ray absorption spectroscopy (XAS) of several cathode materials for Li-ion batteries. In the case of total-FY (TFY) XAS for LiNi0.5Mn1.5O4, the line shape of the Mn L3-edge XAS was largely distorted by the self-absorption and saturation effects, while the distortions were less pronounced at the Ni L3 edge. The distortions were suppressed for the inverse-partial-FY (IPFY) spectra. We found that, in the cathode materials, the IPFY XAS is highly effective for the Cr, Mn, and Fe L edges and the TFY and PFY modes are useful enough for the Ni L edge which is far from the O K edge.

Highlights

We evaluate the utilities of fluorescence-yield (FY) modes in soft X-ray absorption spectroscopy (XAS) of several cathode materials for Li-ion batteries
In the cathode materials, the IPFY XAS is highly effective for the Cr, Mn, and Fe L edges and the TFY and PFY modes are useful enough for the Ni L edge which is far from the O K edge
Powdered Li-transition metals (TMs) oxides and related compounds used for cathode materials of Li-ion batteries (LIBs) are frequently affected by these effects.[7]

Summary

Introduction

Daisuke Asakura,1,a Eiji Hosono,[1] Yusuke Nanba,1,b Haoshen Zhou,[1] Jun Okabayashi,[2] Chunmei Ban,[3] Per-Anders Glans,[4] Jinghua Guo,[4,5] Takashi Mizokawa,6,c Gang Chen,[7] Andrew J. We evaluate the utilities of fluorescence-yield (FY) modes in soft X-ray absorption spectroscopy (XAS) of several cathode materials for Li-ion batteries.

Results

Conclusion