A Spatially-Resolved operando High-Energy Confocal X-ray Diffraction Method for Observing Non-Uniform Degradation Phenomena in a Practical Cylindrical Lithium-ion Battery

We report the results of spatially-resolved non-destructive operando electrode reaction analysis for practical cylindrical 18650 battery cells by using a high-energy confocal X-ray diffraction (XRD). A combination of high-energy X-rays (72 keV) and a confocal XRD method, which extracts structural in...

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Bibliographic Details
Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2020/03/05, Vol.88(2), pp.63-68
Main Authors: BABA, Teruhisa, TAKAO, Naoki, HONDA, Yoshitake, ARAO, Masazumi, MATSUMOTO, Masashi, ITOH, Takanori, IMAI, Hideto
Format: Article
Language:English
Subjects:
Coated electrodes
Confocal X-ray Diffraction
Cracks
Cytology
Electrodes
Electrolytic cells
Energy
Lithium
Lithium-ion Batteries
Non-destructive Analysis
Nondestructive testing
Rechargeable batteries
Resistance factors
Solid electrolytes
Spatially-resolved Analysis
X-ray diffraction
X-rays
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Summary:We report the results of spatially-resolved non-destructive operando electrode reaction analysis for practical cylindrical 18650 battery cells by using a high-energy confocal X-ray diffraction (XRD). A combination of high-energy X-rays (72 keV) and a confocal XRD method, which extracts structural information in a limited area that satisfies a confocal condition, allows us to observe electrode reactions in a cylindrical battery cell in a non-destructive way, resolving the double-side-coating electrode structure.We observed that electrode reactions were faster in the outer-part electrode than in the inner-part at the initial state reflecting intrinsic cell structure (position of current tab). For a battery cell deteriorated after 500 charge/discharge cycles, in contrast, electrode reactions were faster in the inner-part electrode than in the outer-part, suggesting that the outer-part is more deteriorated than the inner part. The results of characterization of disassembled electrodes show that the observed slow response of the outer-electrode of a 500-cycled cell is attributed to various factors increasing resistance such as cracks in cathode particles, formation of insulating surface oxide-phase, and anomalous growth of solid electrolyte interphases (SEIs). As shown here, the high-energy confocal XRD is effective for non-destructive analysis of electrode reactions.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.19-00059