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Na+ Pre-Intercalated Bilayered V2O5 Cathode Materials for Na-Ion Batteries

Fu, Qiang 1; Schwarz, Björn ORCID iD icon 1; Sarapulova, Angelina 1; Luo, Xianlin ORCID iD icon 1; Hansen, Julian 1; Meng, Zhen 2; Baran, Volodymyr 3; Missyul, Alexander; Welter, Edmund 1; Hua, Weibo 1; Knapp, Michael ORCID iD icon 1; Ehrenberg, Helmut 1; Dsoke, Sonia ORCID iD icon 1
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)
2 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)
3 Deutsches Elektronen-Synchrotron (DESY)

Abstract (englisch):

Na+ pre-intercalated bilayered vanadium oxide (NVOnH) with a large interlayer spacing of ∼11.1 Å is synthesized via hydrothermal method. As proven by mass spectrometry and magnetization measurements, NVOnH is “oxygen-rich”. NVOnH undergoes a notable structure evolution and thermal instability during heating due to crystal water and O2 release and decomposition. NVOnH and dehydrated NVOnH (NVO) deliver a capacity of over 250 mAh g−1 and 220 mAh g−1, respectively, despite their fast capacity decay in the first 20 cycles and low capacity retention after 100 cycles. Moreover, the reaction mechanism and reversibility of NVOnH and NVO during Na+ ions (de)insertion are investigated via in operando techniques. NVOnH experiences a 2-phase and solid solution reaction during discharge and charge processes while NVO undergoes a different phase evolution (NVO starting with charging: 2-phase reaction for the first charging and only solid solution for the following cycle; NVO starting with discharging: only solid solution reaction). In operando X‑ray absorption spectroscopy demonstrates the variation of the oxidation state and the local structural environment of V ion during Na+ (de)insertion.


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Helmholtz-Institut Ulm (HIU)
Publikationstyp Forschungsdaten
Publikationsdatum 09.08.2024
Erstellungsdatum 06.08.2024 - 06.08.2024
Identifikator DOI: 10.35097/ejazcks3bd5v3fq2
KITopen-ID: 1000173140
HGF-Programm 43.35.03 (POF IV, LK 01) Structural and Functional Behavior of Solid State Systems
Lizenz Creative Commons Namensnennung – Weitergabe unter gleichen Bedingungen 4.0 International
Vorab online veröffentlicht am 06.08.2024
Schlagwörter Na-ion batteries; vanadium oxide cathode; in situ high-temperature synchrotron diffraction; in operando synchrotron diffraction; in operando X‑ray absorption spectroscopy.
Liesmich

The data include electrochemistry data, XPS, TGA, XRD, magnetic data, in situ HT XRD, in situ XRD and XAS data, which were plotted using Origin software.

Art der Forschungsdaten Dataset
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