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Raman Diagnostics of Cathode Materials for Li-Ion Batteries Using Multi-Wavelength Excitation

Heber, Marcel ; Hofmann, Kathrin ; Hess, Christian (2022):
Raman Diagnostics of Cathode Materials for Li-Ion Batteries Using Multi-Wavelength Excitation. (Publisher's Version)
In: Batteries, 8 (2), MDPI, e-ISSN 2313-0105,
DOI: 10.26083/tuprints-00021214,
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Item Type: Article
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Raman Diagnostics of Cathode Materials for Li-Ion Batteries Using Multi-Wavelength Excitation
Language: English
Abstract:

Lithium-ion batteries have been commonly employed as power sources in portable devices and are of great interest for large-scale energy storage. To further enhance the fundamental understanding of the electrode structure, we report on the use of multi-wavelength Raman spectroscopy for the detailed characterization of layered cathode materials for Li-ion batteries (LiCoO₂, LiNixCo₁₋xO₂, LiNi1/₃Mn₁/₃Co₁/₃O₂). Varying the laser excitation from the UV to the visible (257, 385, 515, 633 nm) reveals wavelength-dependent changes in the vibrational profile and overtone/combination bands, originating from resonance effects in LiCoO₂. In mixed oxides, the influence of resonance effects on the vibrational profile is preserved but mitigated by the presence of Ni and/or Mn, highlighting the influence of resonance Raman spectroscopy on electronic structure changes. The use of UV laser excitation (257, 385 nm) is shown to lead to a higher scattering efficiency towards Ni in LiNi₁/₃Mn₁/₃Co₁/₃O₂ compared to visible wavelengths, while deep UV excitation at 257 nm allows for the sensitive detection of surface species and/or precursor species reminiscent of the synthesis. Our results demonstrate the potential of multi-wavelength Raman spectroscopy for the detailed characterization of cathode materials for lithium-ion batteries, including phase/impurity identification and quantification, as well as electronic structure analysis.

Journal or Publication Title: Batteries
Volume of the journal: 8
Issue Number: 2
Place of Publication: Darmstadt
Publisher: MDPI
Collation: 12 Seiten
Uncontrolled Keywords: lithium-ion batteries; cathode; LiCoO₂; NMC; resonance Raman spectroscopy; multiwavelength excitation; UV Raman spectroscopy
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 07 Department of Chemistry > Physical Chemistry
Date Deposited: 24 Aug 2022 12:15
Last Modified: 24 Aug 2022 12:48
DOI: 10.26083/tuprints-00021214
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-212149
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21214
PPN: 490346588
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