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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High‐Entropy Configuration Regulating Interlayer Oxygen Charge Toward High‐Voltage and Air‐Stability Layered Cathode in High‐Loading Sodium Ion Full Batteries

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 18, 2025

Abstract Revealing interlayer oxygen charge is of great significance in understanding the high‐voltage and air stability sodium layered cathodes, but it currently lacks attention. Particularly, ion full batteries under high cathode loading (≥8 mg cm −2 ) also faces extremely challenges. Here, its mechanism for are revealed a high‐entropy O3‐Na 0.85 Li 0.1 Al 0.02 Sn 0.08 Cu Ti Ni 0.3 Mn O 2 (HEO) cathode, which enables robust high‐cathode‐loading sodium‐ion batteries. The doping effectively maintains transition metal (TM)─O bond covalency, stabilizing charge. stable O─O repulsion avoids structural collapse, realizing P3‐OP2‐P3 reversible phase transition. Moreover, reduced achieves Na layer contraction Na─O enhancement. These features inhibit attack water loss, well stability. Therefore, HEO exhibits good up to 900 cycles 2.0‒4.3 V high‐capacity retention 96.12% after 5 day exposure. pouch cell with ≈16 ≈60 mAh lasts 100 cycles. This work contributes new insights into both cathodes practical

Язык: Английский

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Mechanisms and Mitigation Strategies of Gas Generation in Sodium-Ion Batteries

Nano-Micro Letters, Год журнала: 2025, Номер 17(1)

Опубликована: Март 10, 2025

Abstract The transition to renewable energy sources has elevated the importance of SIBs (SIBs) as cost-effective alternatives lithium-ion batteries (LIBs) for large-scale storage. This review examines mechanisms gas generation in SIBs, identifying from cathode materials, anode and electrolytes, which pose safety risks like swelling, leakage, explosions. Gases such CO 2 , H O primarily arise instability side reactions between electrode electrolyte, electrolyte decomposition under high temperatures or voltages. Enhanced mitigation strategies, encompassing design, buffer layer construction, material optimization, are deliberated upon. Accordingly, subsequent research endeavors should prioritize long-term high-precision detection bolster performance thereby fortifying their commercial viability furnishing dependable solutions storage electric vehicles.

Язык: Английский

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Emerging modification strategies for layered Fe-based oxide cathodes toward high-performance sodium-ion batteries

Journal of Energy Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 1, 2025

Язык: Английский

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In Situ Bulk Oxygen Vacancy Manufacturing and Surface Spinel Layer Coating Enable High‐Performance Na‐Ion Layered Fe–Mn Based Cathodes

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 11, 2025

Abstract Iron‐manganese based layered transition metal (TM) oxides are promising cathodes for sodium‐ion batteries owing to their high specific capacity and cost effectiveness, but they confronted by severe Mn 3+ Jahn‐Teller distortion, lattice oxygen loss, irreversible Fe migration. Herein, in situ bulk vacancy manufacturing surface spinel (MnFe 2 O 4 ) layer coating the P2‐Na 0.67 0.3 0.7 (NFM(OV)+MnFe cathode realized via an argon‐atmosphere calcination method. The vacancies improve redox reducing valence, favor reversible interlayer migration enhance activity through Na─O─(TM vacancy) configurations. migrated ions Na sites can serve as “temporary pillars” suppress TMO layers gliding deep charged state return original positions upon discharge. mitigate escape, prevent interfacial side reactions, alleviate distortion. Therefore, tailored NFM(OV)+MnFe affords discharge capacities (185.7 84 mAh g −1 at 0.1 5 C, respectively) desirable cycling stability (82.6% retention after 300 cycles). This study paves way fabricating high‐performance Fe─Mn oxide simultaneously tuning structures.

Язык: Английский

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Enhancing the electrochemical performance of O3-type high entropy layered oxide cathode for sodium-ion batteries via a covalent Co−(O−O) bonding

Materials Today Energy, Год журнала: 2025, Номер unknown, С. 101884 - 101884

Опубликована: Апрель 1, 2025

Язык: Английский

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Improving long-cycle capability of O3 type NaNi1/3Fe1/3Mn1/3O2 via Ti replacing Fe for stable sodium-ion batteries

Ionics, Год журнала: 2025, Номер unknown

Опубликована: Апрель 15, 2025

Язык: Английский

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Superexchange interaction regulates Ni/Mn spin states triggering Ni-t2g/O-2p reductive coupling enabling stable lithium-rich cathode

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Апрель 25, 2025

Lithium-rich layer oxides are expected to be high-capacity cathodes for next-generation lithium-ion batteries, but their performance is hindered by irreversible anionic redox, leading voltage decay, lag, and slow kinetics. In order solve these problems, we regulate the Ni/Mn spin state in Li1.2Mn0.6Ni0.2O2 Be doping, which generates superexchange interaction activates Ni-t2g orbitals. The activation of orbitals triggers reductive coupling mechanism between Ni/O, improves reversibility kinetics redox. strong π-type Ni-t2g/O-2p forms a stable Ni-(O-O) configuration, suppressing excessive anion oxidation. this work, modified have good cycle stability, 0.04 mAh/g 0.5 mV decay per over 400 cycles at 1 C (60 min, 250 mA g-1), with rate 187 10 (6 2500 providing strategy stabilising oxygen redox chemistry designing high lithium-rich cathodes.

Язык: Английский

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Jahn‐Teller Effect in Sodium Layered Oxide Cathodes: Inducement Mechanisms, Mitigation Strategies, and Rational Utilizations

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 2, 2025

Abstract The sodium‐layered transition metal oxides (Na x TMO 2 ) are regarded as the promising cathode for sodium‐ion batteries (SIBs) relying on their high theory capacity and cost‐effectiveness. Nevertheless, intrinsic lattice distortions caused by Jahn‐Teller active ions significantly degrade structural stability of Na , generally resulting in unsatisfactory electrochemical properties. In this review, begins introducing inducement mechanisms effect (TM) ions. Subsequently, restraining strategies well corresponding using element doping/substitutions, surface reconstructions, polyphase symbiosis, TM/oxygen/Na + vacancy manipulations summarized detail. Specifically, influences such mitigation deformation properties, phase evolution behaviors, TM dissolution characteristics, crystal comprehensively discussed. Furthermore, sensible utilization distortion is to build cathodes with and/or repaid ion transport kinetics well. end, challenges faced amelioration methods overviewed put forward research directions future trenchantly constrain 6 octahedron deformation. This work will provide more perceptions further studies SIBs.

Язык: Английский

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Engineering high-density microcrystalline boundary with V-doped RuO2 for high-performance oxygen evolution in acid

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Май 14, 2025

Designing efficient acidic oxygen evolution catalysts for proton exchange membrane water electrolyzers is challenging due to a trade-off between activity and stability. In this work, we construct high-density microcrystalline grain boundaries (GBs) with V-dopant in RuO2 matrix (GB-V-RuO2). Our theoretical experimental results indicate highly active acid-resistant OER catalyst. Specifically, the GB-V-RuO2 requires low overpotentials of 159, 222, 300 mV reach 10, 100, 1500 mA cm-2geo 0.5 M H2SO4, respectively. Operando EIS, ATR-SEIRAS FTIR DEMS measurements reveal importance GBs stabilizing lattice thus inhibiting mediated pathway. As result, adsorbate mechanism pathway becomes dominant, even at high current densities. Density functional theory analyses confirm that can stabilize V dopant synergy them modulates electronic structure RuO2, optimizing adsorption intermediate species enhancing electrocatalyst work demonstrates rational strategy overcoming traditional activity/stability dilemma, offering good prospects developing high-performance catalysts.

Язык: Английский

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