Journal Article

PUBDB-2025-01343

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unlocking Four‐electron Conversion in Tellurium Cathodes for Advanced Magnesium‐based Dual‐ion Batteries

Morag, A.Extern* ; Chu, X.Extern* ; Marczewski, M. ; Kunigkeit, J. ; Neumann, C. ; Sabaghi, D. ; Żukowska, G. Z. ; Du, J.Extern* ; Li, X.Extern*XFEL.EU* ; Turchanin, A. ; Brunner, E. ; Feng, X. (Corresponding author)Extern* ; Yu, M. (Corresponding author)Extern*

2024
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/anie.202401818  doi:10.3204/PUBDB-2025-01343

Abstract: Magnesium (Mg) batteries hold promise as a large-scale energy storage solution, but their progress has been hindered by the lack of high-performance cathodes. Here, we address this challenge by unlocking the reversible four-electron Te$^0$/Te$^{4+}$ conversion in elemental Te, enabling the demonstration of superior Mg//Te dual-ion batteries. Specifically, the classic magnesium aluminum chloride complex (MACC) electrolyte is tailored by introducing Mg bis(trifluoromethanesulfonyl)imide (Mg(TFSI)$_2$), which initiates the Te$^0$/Te$^{4+}$ conversion with two distinct charge-storage steps. Te cathode undergoes Te/TeCl$_4$ conversion involving Cl− as charge carriers, during which a tellurium subchloride phase is presented as an intermediate. Significantly, the Te cathode achieves a high specific capacity of 543 mAh gTe$^{−1}$ and an outstanding energy density of 850 Wh kgTe$^{−1}$, outperforming most of the previously reported cathodes. Our electrolyte analysis indicates that the addition of Mg(TFSI)2 reduces the overall ion-molecule interaction and mitigates the strength of ion-solvent aggregation within the MACC electrolyte, which implies the facilized Cl− dissociation from the electrolyte. Besides, Mg(TFSI)$_2$ is verified as an essential buffer to mitigate the corrosion and passivation of Mg anodes caused by the consumption of the electrolyte MgCl$_2$ in Mg//Te dual-ion cells. These findings provide crucial insights into the development of advanced Mg-based dual-ion batteries.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. DFG project G:(GEPRIS)417590517 - SFB 1415: Chemie der synthetischen zweidimensionalen Materialien (417590517) (417590517)
3. LIGHT-CAP - MULTI-ELECTRON PROCESSES FOR LIGHT DRIVEN ELECTRODES AND ELECTROLYTES IN CONVERSION AND STORAGE OF SOLAR ENERGY (101017821) (101017821)

Experiment(s):

1. PETRA Beamline P62 (PETRA III)
2. PETRA Beamline P65 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; ; ; Chemical Reactions ; Clarivate Analytics Master Journal List ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 15 ; Index Chemicus ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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