Elucidating the optimized P2 type Na0.67Mn1−xCuxO2 cathode active material via operando XAS

S. Altin; S. Altundag; E. Altin; D. E.P. Vanpoucke; S. Avci; M. N. Ates

doi:10.1016/j.jallcom.2022.168138

Elucidating the optimized P2 type Na_0.67Mn_1−xCu_xO₂ cathode active material via operando XAS

S. Altin, S. Altundag, E. Altin, D. E.P. Vanpoucke, S. Avci, M. N. Ates^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Here we report on the structural and electrochemical properties of P2-type Na_0.67Mn_1−xCu_xO₂ (where x = 0.20–0.50) via various techniques. X-ray diffraction (XRD) reveals a reduction of the unit cell volume upon substitution of Cu elucidated through detailed Rietveld analysis. The cyclic voltammetry (CV) behavior is also affected by the Cu substitution indicating new redox reactions stemming from Cu substitution. Galvanostatic cycling measurements at room temperature show that when x = 0.35 in a P2-type Na_0.67Mn_1−xCu_xO₂ cathode active material, the best electrochemical performance is obtained. The Na-ion diffusion rate is found to be strongly dependent upon the environmental temperature. Changes in the valence state and the local structures of P2-type Na_0.67Mn_1−xCu_xO₂ during the charge/discharge are investigated through the operando X-ray absorption spectroscopy (XAS) technique.

Original language	English
Article number	168138
Journal	Journal of Alloys and Compounds
Volume	936
DOIs	https://doi.org/10.1016/j.jallcom.2022.168138
Publication status	Published - 5 Mar 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

Cu-substitution
Na-ion
Na0.67MnO2
Operando XAS

Access to Document

10.1016/j.jallcom.2022.168138

Cite this

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title = "Elucidating the optimized P2 type Na0.67Mn1−xCuxO2 cathode active material via operando XAS",

abstract = "Here we report on the structural and electrochemical properties of P2-type Na0.67Mn1−xCuxO2 (where x = 0.20–0.50) via various techniques. X-ray diffraction (XRD) reveals a reduction of the unit cell volume upon substitution of Cu elucidated through detailed Rietveld analysis. The cyclic voltammetry (CV) behavior is also affected by the Cu substitution indicating new redox reactions stemming from Cu substitution. Galvanostatic cycling measurements at room temperature show that when x = 0.35 in a P2-type Na0.67Mn1−xCuxO2 cathode active material, the best electrochemical performance is obtained. The Na-ion diffusion rate is found to be strongly dependent upon the environmental temperature. Changes in the valence state and the local structures of P2-type Na0.67Mn1−xCuxO2 during the charge/discharge are investigated through the operando X-ray absorption spectroscopy (XAS) technique.",

keywords = "Cu-substitution, Na-ion, Na0.67MnO2, Operando XAS",

author = "S. Altin and S. Altundag and E. Altin and Vanpoucke, {D. E.P.} and S. Avci and Ates, {M. N.}",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2023",

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T1 - Elucidating the optimized P2 type Na0.67Mn1−xCuxO2 cathode active material via operando XAS

AU - Altin, S.

AU - Altundag, S.

AU - Altin, E.

AU - Vanpoucke, D. E.P.

AU - Avci, S.

AU - Ates, M. N.

PY - 2023/3/5

Y1 - 2023/3/5

N2 - Here we report on the structural and electrochemical properties of P2-type Na0.67Mn1−xCuxO2 (where x = 0.20–0.50) via various techniques. X-ray diffraction (XRD) reveals a reduction of the unit cell volume upon substitution of Cu elucidated through detailed Rietveld analysis. The cyclic voltammetry (CV) behavior is also affected by the Cu substitution indicating new redox reactions stemming from Cu substitution. Galvanostatic cycling measurements at room temperature show that when x = 0.35 in a P2-type Na0.67Mn1−xCuxO2 cathode active material, the best electrochemical performance is obtained. The Na-ion diffusion rate is found to be strongly dependent upon the environmental temperature. Changes in the valence state and the local structures of P2-type Na0.67Mn1−xCuxO2 during the charge/discharge are investigated through the operando X-ray absorption spectroscopy (XAS) technique.

AB - Here we report on the structural and electrochemical properties of P2-type Na0.67Mn1−xCuxO2 (where x = 0.20–0.50) via various techniques. X-ray diffraction (XRD) reveals a reduction of the unit cell volume upon substitution of Cu elucidated through detailed Rietveld analysis. The cyclic voltammetry (CV) behavior is also affected by the Cu substitution indicating new redox reactions stemming from Cu substitution. Galvanostatic cycling measurements at room temperature show that when x = 0.35 in a P2-type Na0.67Mn1−xCuxO2 cathode active material, the best electrochemical performance is obtained. The Na-ion diffusion rate is found to be strongly dependent upon the environmental temperature. Changes in the valence state and the local structures of P2-type Na0.67Mn1−xCuxO2 during the charge/discharge are investigated through the operando X-ray absorption spectroscopy (XAS) technique.

KW - Cu-substitution

KW - Na-ion

KW - Na0.67MnO2

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