Home > Publications database > Unlocking Four‐electron Conversion in Tellurium Cathodes for Advanced Magnesium‐based Dual‐ion Batteries > print

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100 1 _ |a Morag, Ahiud
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245 _ _ |a Unlocking Four‐electron Conversion in Tellurium Cathodes for Advanced Magnesium‐based Dual‐ion Batteries
260 _ _ |a Weinheim
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520 _ _ |a 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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536 _ _ |a LIGHT-CAP - MULTI-ELECTRON PROCESSES FOR LIGHT DRIVEN ELECTRODES AND ELECTROLYTES IN CONVERSION AND STORAGE OF SOLAR ENERGY (101017821)
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700 1 _ |a Chu, Xingyuan
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700 1 _ |a Marczewski, Maciej
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700 1 _ |a Kunigkeit, Jonas
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700 1 _ |a Neumann, Christof
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700 1 _ |a Sabaghi, Davood
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700 1 _ |a Żukowska, Grażyna Zofia
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700 1 _ |a Du, Jingwei
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700 1 _ |a Li, Xiaodong
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700 1 _ |a Turchanin, Andrey
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700 1 _ |a Brunner, Eike
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700 1 _ |a Feng, Xinliang
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700 1 _ |a Yu, Minghao
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773 _ _ |a 10.1002/anie.202401818
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