jp5029273_si_001.pdf (316.04 kB)
Spectroscopic X‑ray Diffraction for Microfocus Inspection of Li-Ion Batteries
journal contribution
posted on 2014-09-11, 00:00 authored by Haruno Murayama, Koji Kitada, Katsutoshi Fukuda, Akio Mitsui, Koji Ohara, Hajime Arai, Yoshiharu Uchimoto, Zempachi Ogumi, Eiichiro MatsubaraWe developed spectroscopic X-ray
diffraction (XRD) analysis to
visualize electrochemical reactions occurring at various locations
in Li-ion batteries (LIBs). Continuous irradiation with monochromatic
X-rays in an energy region using a confocal setup provided a fixed
observation position on the order of several tens of microns. Unlike
three-dimensionally position sensitive XRD analyses, e.g., angle-scanning
XRD and energy-dispersive XRD, this energy-scanning XRD analysis with
angle-scanning of the monochromator instead of the detector-scanning
has the advantage of profile resolution, position sensitivity, and
time-resolution for mapping concentration gradients and diffusion
of Li+ associated with the electrochemical properties of
LIBs. The microscopic structural inhomogeneity in a sheet-like composite
electrode of LiNi1/3Co1/3Mn1/3O2 with a thickness of 150 μm was successfully determined
with a depth resolution of 50 μm during cell operation. This
work demonstrates the potential of spectroscopic XRD as a nondestructive
and pinpoint analysis method, thus contributing to the development
of high-performance LIBs.
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Keywords
LIB150 μ melectrochemical propertiesmapping concentration gradientsprofile resolutionobservation positionconfocal setupMicrofocus InspectionXRD analyses50 μ mspectroscopic XRDenergy regionelectrochemical reactionsposition sensitivityanalysis methodContinuous irradiationcell operationdepth resolution
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