Regulation of Coordination Chemistry To Accelerate Na⁺ Transfer Kinetics of Polyanionic Cathodes for Ultrastable Sodium-Ion Batteries

Nano Letters, Год журнала: 2025, Номер unknown

Опубликована: Фев. 3, 2025

Alluaudite-type iron-based sulfate structure (Na2+2xFe2-x(SO4)3) has attracted wide attention due to its high working voltage and low cost. However, their practical application is hindered by challenges such as limited reversible capacity sluggish transfer kinetics. Herein, we proposed an anion substitution strategy optimize cathode materials. The electrochemical characterization theoretical calculations confirmed a reduction in the migration barrier of Na+ ions various pathways. Besides, fluorine weakened electron density crystal plane, thereby impeding continuous side reaction electrolyte. As expected, NFSF can exhibit 121.5 mAh g-1 at 12 mA keep retention 78.8% after 1000 cycles 600 g-1. In addition, NFSF-based hard carbon (HC)-based anode were assembled into laboratory-scale pouch cell demonstrate performance applications.

Язык: Английский

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Lattice Regulation Boosts Working Voltage and Energy Density of Na_3.12Fe_2.44(P₂O₇)₂ Cathode for Sodium‐Ion Batteries

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 9, 2025

Abstract Pyrophosphate Na 3.12 Fe 2.44 (P 2 O 7 ) (NFPO) has triggered widespread attention due to its high safety and robust framework. However, it suffers from low energy density the limited specific capacity partial voltage plateau (≈2.5 V vs + /Na). Regulating such can be a promising way increase of NFPO. As revealed by systematic characterizations theoretical calculations, low‐voltage results Fe1 site (corner‐sharing mode) redox reaction accompanied Na4 insertion/extraction process. Accordingly, in this work, precise Ti 3+ doping strategy is proposed selectively occupy based on effect, thus boosting 277.5 307.7 Wh kg −1 improved reversible (109.8 mAh g regulated plateau. Reversible structural evolution with very tiny volume variation (3%) strengthened local environment (Ti─O bonds) promises outstanding cycling durability (90.3% retention over 4000 cycles). Moreover, fast kinetics diffusion barriers achieved introducing contribute excellent rate capability. This lattice regulation enables NFPO cathode superior performance provide deep guidelines for designing advanced polyanion cathodes.

Язык: Английский

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Challenges and Strategies for Multi‐Electron Reactions in High‐Energy Phosphate‐Based Cathodes for Sodium‐Ion Batteries

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 16, 2025

Abstract Sodium‐ion batteries (SIBs) have been considered as promising candidates for large‐scale energy storage systems and low‐speed electric vehicles due to abundant sodium resources low cost. Phosphate‐based cathodes stand out their high voltages, structural stability, superior safety, etc. However, large molecular weight limits the overall capacity, compromising density practical applications. Recent advancements in multi‐electron reactions based on transition metal (TM) ions provide a pathway achieve both stability. This review discusses fundamental principles behind of phosphate‐based from perspectives electrochemistry materials science. The key factors, such conservation matter charge, thermodynamic, kinetic feasibility, are addressed activating regulating reactions, aiming capacity exceeding 170 mAh g −1 . current progress NASICON‐type phosphate is summarized, challenges associated with pyrophosphate mixed analyzed reactions. Finally, future development high‐energy provided.

Язык: Английский

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Multifunctional sulfonate additive induced CEI layer enables ultra-stable PEO based solid-state sodium batteries

Rare Metals, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

Язык: Английский

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High-entropy doping in NASICON cathodes: Activating the V4+/V5+ redox couple and inducing a reversible single solid-solution phase reaction for advanced sodium ion batteries

Journal of Colloid and Interface Science, Год журнала: 2025, Номер 690, С. 137299 - 137299

Опубликована: Март 11, 2025

Язык: Английский

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