| Title: | Structural and chemical analysis of hard carbon negative electrode for Na-ion battery with X-ray Raman scattering and solid-state NMR spectroscopy |
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| Authors: | ID Rajh, Ava, IJS (Author)
ID Gabrijelčič, Matej, KI (Author)
ID Tratnik, Blaž, KI (Author)
ID Bučar, Klemen, IJS (Author)
ID Arčon, Iztok, UNG (Author)
ID Petric, Marko, IJS (Author)
ID Dominko, Robert, KI (Author)
ID Vižintin, Alen, KI (Author)
ID Kavčič, Matjaž, IJS (Author) |
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| Files: |  Na-ion.pdf (7,76 MB)
MD5: 69D37977EF24BA0E6721D715585A31A4
1-s2.0-S0008622324006171-main.pdf (2,78 MB)
MD5: 58ECB941A2C27194E8D259B87BC285DA
 https://www.sciencedirect.com/science/article/pii/S0008622324006171?via%3Dihub
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | This study explores the structural changes of hard carbon (HC) negative electrodes in sodium-ion batteries induced by insertion of Na ions during sodiation. X-ray Raman spectroscopy (XRS) was used to record both C and Na K-edge absorption spectra from bulk HC anodes carbonized at different temperatures and at several points during sodiation and desodiation. Comparing the [pi]*/[sigma]*
regions in the C K-edge spectra sp2/sp3 hybridization ratio of material was determined. Higher carbonization temperatures led to increased order in graphitic structure and shorter bond lengths. Sodiation caused a decrease in graphitic layer order due to inserted Na ions. Complementary operando solid state 23Na nuclear magnetic resonance (ssNMR) studies confirmed the structural changes, while showing pore filling mechanism, which is not observed in ex situ measurements, primarily at higher carbonization temperatures. XRS analysis of Na K-edge spectra revealed systematic variations in the solid electrolyte interface (SEI) composition during cycling. Changes in XRS spectra were attributed to both SEI composition alterations, accompanied by the insertion/adsorption of Na ions at defect sites within the carbon structure. |
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| Keywords: | hard carbon, RIXS, carbon XANES, EXAFS, NMR, Na battery |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.09.2024 |
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| Number of pages: | str. 1-14 |
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| Numbering: | 2024, Vol. 228, [article no.] 119398 |
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| PID: | 20.500.12556/RUNG-9189  |
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| COBISS.SI-ID: | 201116419 |
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| UDC: | 544.5/.6 |
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| ISSN on article: | 1873-3891 |
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| DOI: | 10.1016/j.carbon.2024.119398 |
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| NUK URN: | URN:SI:UNG:REP:6WPFWJBD |
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| Publication date in RUNG: | 10.09.2024 |
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| Views: | 847 |
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| Downloads: | 1 |
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