Modulating ion–dipole interactions in nonflammable phosphonate-based electrolyte for safe and stable sodium-ion pouch cells

National Science Review, Journal Year: 2024, Volume and Issue: 12(3)

Published: Dec. 21, 2024

Phosphonate-based electrolytes with the merits of low cost and intrinsic nonflammability are promising candidates to realize safe operation sodium-ion batteries. However, they generally suffer from poor interfacial chemistry because solvent-dominated solvation structure induced by strong ion-dipole interactions between cations phosphonate molecules. Herein, we report an electrolyte design strategy that selectively improves competitive coordination low-solvating-power molecules, achieving stable a non-flammable, low-cost fluorine-free electrolyte. By improving ion-ion interaction cation anion, weakly coordinated molecules can enter Na+ shell, thereby promoting more adjustable advantageous chemistry. As result, Prussian blue||hard carbon pouch cell, high cathode mass loading ∼20 mg cm-2, reaches capacity retention energy density over 221.7 Wh kg-1 based on electrode 115.1 battery mass.

Language: Английский

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Anion-cation interactions dictate safe and stable electrolytes for sodium-ion batteries

Communications Materials, Journal Year: 2024, Volume and Issue: 5(1)

Published: July 8, 2024

Sodium-ion battery safety can be improved by using non-flammable electrolytes, but they are traditionally incompatible with carbon-based anodes. Now, low-concentration phosphate electrolytes modulated anion-cation interactions shown to work well standard electrodes, displaying stable operation over a wide temperature range.

Language: Английский

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A Supramolecular Deep Eutectic Electrolyte Enhancing Interfacial Stability and Solution Phase Discharge in Li‐O2 Batteries

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(48)

Published: Sept. 2, 2024

Abstract Li−O 2 batteries (LOBs) have gained widespread recognition for their exceptional energy densities. However, a major challenge faced by LOBs is the lack of appropriate electrolytes that can effectively balance reactant transport, interfacial compatibility, and non‐volatility. To address this issue, novel supramolecular deep eutectic electrolyte (DEE) has been developed, based on synergistic interaction between Li‐bonds H‐bonds through combination lithium salt (LiTFSI), acetamide (Ace) boric acid (BA). The incorporation BA serves as an interface modification additive, acting both acceptor donor/acceptor, thereby enhancing redox stability electrolyte, facilitating solution phase discharge process improving compatibility with Li anode. Our proposed DEE demonstrates high oxidation voltage 4.5 V, ultrahigh capacity 15225 mAh g −1 stable cycling performance 196 cycles in LOBs. Additionally, intrinsic non‐flammability successful operation pouch cell indicate promising practical applications electrolyte. This research broadens design possibilities provides theoretical insights future studies.

Language: Английский

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A Supramolecular Deep Eutectic Electrolyte Enhancing Interfacial Stability and Solution Phase Discharge in Li‐O2 Batteries

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(48)

Published: Sept. 2, 2024

Abstract Li−O 2 batteries (LOBs) have gained widespread recognition for their exceptional energy densities. However, a major challenge faced by LOBs is the lack of appropriate electrolytes that can effectively balance reactant transport, interfacial compatibility, and non‐volatility. To address this issue, novel supramolecular deep eutectic electrolyte (DEE) has been developed, based on synergistic interaction between Li‐bonds H‐bonds through combination lithium salt (LiTFSI), acetamide (Ace) boric acid (BA). The incorporation BA serves as an interface modification additive, acting both acceptor donor/acceptor, thereby enhancing redox stability electrolyte, facilitating solution phase discharge process improving compatibility with Li anode. Our proposed DEE demonstrates high oxidation voltage 4.5 V, ultrahigh capacity 15225 mAh g −1 stable cycling performance 196 cycles in LOBs. Additionally, intrinsic non‐flammability successful operation pouch cell indicate promising practical applications electrolyte. This research broadens design possibilities provides theoretical insights future studies.

Language: Английский

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Unraveling the pseudocapacitive sodium-ion storage mechanism of birnessite in organic electrolytes

Chinese Chemical Letters, Journal Year: 2024, Volume and Issue: unknown, P. 110416 - 110416

Published: Sept. 1, 2024

Language: Английский

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