TY - JOUR
T1 - Quantitative lithium mapping of lithium-ion battery cathode using laser-induced breakdown spectroscopy
AU - Imashuku, Susumu
AU - Taguchi, Hiroyuki
AU - Kawamata, Toru
AU - Fujieda, Shun
AU - Kashiwakura, Shunsuke
AU - Suzuki, Shigeru
AU - Wagatsuma, Kazuaki
N1 - Funding Information:
Financial support for the present study was provided by JSPS KAKENHI Grant Number 16K14444 . The X-ray absorption spectroscopy measurements were performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2017G144 and 2015G634).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/9/30
Y1 - 2018/9/30
N2 - A method to obtain the quantitative lithium distribution of a lithium-ion battery cathode using laser-induced breakdown spectroscopy (LIBS) measurements is proposed. We perform LIBS measurements in a reduced argon atmosphere of 1000 Pa and use a calibration curve obtained by measuring the emission intensities at 610.4 nm of standard samples, whose atomic ratios of lithium to cobalt are 0, 0.10, 0.30, 0.51, 0.62, 0.80, and 0.99. The lithium distributions of cycled cathodes, which contain LiCoO2 as an active material, obtained by this method are relatively consistent with the Co(III) distributions obtained by X-ray absorption spectroscopy (XAS). XAS is the conventional method to quantitatively display the reaction distribution of a cathode material used in a lithium-ion battery. Additionally, LIBS can detect the precipitating decomposition products of the electrolyte, LiF, on the cathode. However, the precision of the lithium ratio using LIBS is not as good as that achieved for the Co(III) ratio obtained using XAS. Therefore, LIBS is suitable to obtain a semi-quantitative lithium distribution in a cathode of a lithium-ion battery through a much simpler procedure than XAS. Furthermore, LIBS has an advantage to detect the decomposition product of the electrolyte using laboratory-scale measurements.
AB - A method to obtain the quantitative lithium distribution of a lithium-ion battery cathode using laser-induced breakdown spectroscopy (LIBS) measurements is proposed. We perform LIBS measurements in a reduced argon atmosphere of 1000 Pa and use a calibration curve obtained by measuring the emission intensities at 610.4 nm of standard samples, whose atomic ratios of lithium to cobalt are 0, 0.10, 0.30, 0.51, 0.62, 0.80, and 0.99. The lithium distributions of cycled cathodes, which contain LiCoO2 as an active material, obtained by this method are relatively consistent with the Co(III) distributions obtained by X-ray absorption spectroscopy (XAS). XAS is the conventional method to quantitatively display the reaction distribution of a cathode material used in a lithium-ion battery. Additionally, LIBS can detect the precipitating decomposition products of the electrolyte, LiF, on the cathode. However, the precision of the lithium ratio using LIBS is not as good as that achieved for the Co(III) ratio obtained using XAS. Therefore, LIBS is suitable to obtain a semi-quantitative lithium distribution in a cathode of a lithium-ion battery through a much simpler procedure than XAS. Furthermore, LIBS has an advantage to detect the decomposition product of the electrolyte using laboratory-scale measurements.
KW - Cathode
KW - Laser-induced breakdown spectroscopy
KW - Lithium distribution
KW - Lithium fluoride
KW - X-ray absorption spectroscopy
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U2 - 10.1016/j.jpowsour.2018.07.088
DO - 10.1016/j.jpowsour.2018.07.088
M3 - Article
AN - SCOPUS:85050637607
VL - 399
SP - 186
EP - 191
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -
