A Medium‐Entropy NASICON Cathode for Sodium‐Ion Batteries Achieving High Energy Density Through Dual Enhancement of Voltage and Capacity

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Abstract Na 3 V 2 (PO 4 ) (NVP) is recognized for its promising commercialization potential as a sodium‐ion battery (SIB) cathode, due to thermodynamic stability and open structure. However, the limited energy density remains major obstacle further advancement of NVP. Herein, medium‐entropy NASICON 3.3 1.4 Al 0.3 (MgCoNiCuZn) 0.06 (NVAMP‐0.3) designed by introducing 3+ , Mg 2+ Co Ni Cu Zn regulate configurational entropy. These NVAMP‐0.3 achieve an elevated average operating voltage (3.33 V) high capacity (138.1 mAh g −1 based on 2.3 + through /V 4+ 5+ multi‐electron reactions. By simultaneously enhancing voltage, exhibits impressive 460 Wh kg . Furthermore, demonstrates excellent low‐temperature tolerance with retention rate 94.6% after 300 cycles at −40 °C. In situ XRD unveils underlying cause unique phenomenon where solid‐solution reaction accounts faster electrochemical kinetics compared redox. DFT calculations indicate that possesses superior electronic conductivity reduced migration barriers. A pouch cell assembled cathode hard carbon anode highly stable cycling (89.3% 200 1 C). This study provides valuable insights into developing NASICON‐type cathodes densities SIBs.

Language: Английский

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Trace NaBF₄ Modulated Ultralow‐Concentration Ether Electrolyte for Durable High‐Voltage Sodium‐Ion Batteries

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 13, 2025

Abstract Ultralow‐concentration ether electrolytes hold great promise for cost‐effective sodium‐ion batteries (SIBs), while their inferior cycle stability under high voltages remains an awkward challenge. Herein, ultralow‐concentration diglyme (G2)‐based with single sodium salt are found to manifest high‐rate capability when employed high‐voltage Na 3 (VOPO 4 ) 2 F (NVOPF) cathode, but specific capacity rapidly depletes exhaustion during long‐term cycling. To address this issue, trace NaBF (0.03 m as electrolyte additive is introduced, which minimally affects ion conductivity of the pristine electrolyte, yet weakens coordination between + ions and G2 molecules. This allows more PF 6 − enter solvation sheath ions, forming a stable cathode interphase enhancing performance without sacrificing (up 20 C). As result, modulated G2‐based enables NVOPF steadily, retention 94.2% over 1000 cycles at low rate 1 C. work provides valuable insights into modulation use in durable SIBs.

Language: Английский

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β-Cyclodextrin inducing confinement effect enabling spherical Na3V2(PO4)3 with multielectron reaction and superior performance at extreme conditions for sodium-ion batteries

Journal of Energy Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

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In-situ interface engineering of NVOPF nanosheets with cross-linked conductive networks for superior sodium storage

Surfaces and Interfaces, Journal Year: 2025, Volume and Issue: unknown, P. 106259 - 106259

Published: March 1, 2025

Language: Английский

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Designing Cellulose Triacetate‐Based Universal Binder for High‐Voltage Sodium‐Ion Battery Cathodes with Enhanced Ionic Conductivity and Binding Strength

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

Binders play a pivotal role in the performance of sodium-ion battery (SIB) cathodes, but traditional binders often struggle to balance broad compatibility, high ionic conductivity, superior binding strength, and environmental sustainability. In this study, universal cellulose triacetate (TAC)-based binder (TAC-MMT) composed TAC natural montmorillonite (MMT) is designed facilitate rapid Na+ transport pathways establish robust hydrogen-bonding network. This innovative TAC-MMT features unique chemical structure that achieves conductivity through self-enrichment fast-transport mechanism, while its strength attributed crosslinks between proton acceptors (C═O) donors (-OH) MMT. More importantly, outstanding solubility film-forming properties contribute stable electrode protection compatibility with high-voltage SIB cathodes. Benefiting from these advantages, Na3V2(PO4)2O2F (NVPOF) electrodes demonstrate exceptional performance, including capacity retention 95.2% over 500 cycles at 5C rate response up 15C. The versatility further confirmed NaNi1/3Fe1/3Mn1/3O2 Na0.61[Mn0.27Fe0.34Ti0.39]O2 study highlights potential biomass-based as sustainable effective solution for advancing high-performance batteries.

Language: Английский

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Dendritic Conductive Carbon Networks Enhance Na⁺ Transport in Na2+2δFe2-δ(SO4)3@C Cathode for Fast Charging and Wide Temperature Sodium-ion Batteries

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 111075 - 111075

Published: April 1, 2025

Language: Английский

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In Situ Converting Conformal Sacrificial Layer Into Robust Interphase Stabilizes Fluorinated Polyanionic Cathodes for Aqueous Sodium‐Ion Storage

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Abstract Sodium vanadium oxy‐fluorophosphates (NVOPF), as typical fluorinated polyanionic compounds, are considered high‐voltage and high‐capacity cathode materials for aqueous sodium‐ion storage. However, the poor cycle life caused by interfacial degradation (especially attack of specific HF by‐products) greatly hampers their application in electrolytes. Here, it is shown that situ converting harmful derivate to F‐containing electrolyte interphase (CEI) can overcome above challenge. As a proof‐of‐concept, conformal Al 2 O 3 sacrificial layer precoated on NVOPF on‐site generating robust AlF ‐rich CEI while eliminating continuous release. The evolved chemistry mitigates side reactions, inhibits dissolution, promotes Na + transport kinetics, thus significantly boosting cycling stability (capacity retention rate increased 3.15 times), capability, even low‐temperature performance (≈1.5 times capacity improvement at −20 °C). When integrated with pseudocapacitive zeolite‐templated carbon anode adhesive hydrogel electrolyte, unique 2.3 V quasi‐solid‐state hybrid capacitor developed, exhibiting remarkable (77.0% after 1000 cycles), high energy power densities, exceptional safety against extreme conditions. Furthermore, photovoltaic storage module demonstrated, highlighting potential use future smart/microgrids. work paves new avenues enabling unstable electrode via engineering.

Language: Английский

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Orbital‐Modulated Cu‐Doped VO₂ Nanoflowers via Glucose‐Assisted Synthesis: Structural Optimization and Electronic Coupling Engineering for High‐Capacity Aqueous Aluminum Ion Batteries

Small, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 2025

Abstract Vanadium oxide cathode materials in aqueous aluminum‐ion batteries (AAIBs) have an exceptional potential for development because of their high valence and fast electron transfer capability. However, the strong electron–electron Coulomb repulsion vanadium its associated electrostatic interactions severely hinder feasibility oxides AAIBs. The glucose‐assisted hydrothermal reduction monoclinic VO 2 combined with Cu ion doping effectively promotes self‐assembly into nanoflower architectures, enabling precise control over morphology crystalline structure. When integrated a 5 m Al(OTF) 3 electrolyte Ionic liquid （IL ）‐treated Al sheet anode, this full battery demonstrates outstanding electrochemical performance, achieving initial discharge capacity 642 mAh·g −1 at 0.4 A·g . Moreover, introducing 3d orbitals enhances hybridization electronic coupling effects between V O 2p orbitals. Ex situ characterization diffusion kinetic provide insights embedding/de‐embedding mechanism 3+ This work significantly improves application AAIBs through structural optimization studies provides systematic scientific guidance materials.

Language: Английский

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Advanced Multifunctional Sodium‐Ion Battery with High Current Conversion, Long Cycle Life, and All‐Climate Temperature Range by Dual‐Multivalent Cation Doping Strategy

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 2025

Abstract The polyanionic fluorophosphate Na 3 V 2 (PO 4 ) O F is regarded as one of the most prospective cathode materials for high‐energy‐density sodium‐ion batteries (SIBs), owing to its high operating voltage and ideal theoretical specific capacity. Nevertheless, low kinetics significantly restrict electrochemical performance practical applications. In this paper, a novel bimetallic‐doped material, 1.90 Ti 0.05 Cr (NVTC), based on V‐site multivalent cations, developed. When used material in half batteries, it can be stably cycled 3000 cycles with capacity maintenance ratio 96.88% at an ultra‐high current density 20 C. Furthermore, replacing ether electrolyte allows NVTC cycle 150 average Coulombic efficiency 98.34% under harsh conditions −15 °C (1 C density). Moreover, exhibits preliminary 110.5 mAh g −1 50 operate 2500 (5 Remarkably, demonstrates ultra‐fast charging capability (full charge just 1.21 min 30 density) self‐discharge rate (0.006318 h ), alongside considerable high‐quality loads. This study expected positively impact future development advanced multifunctional SIBs.

Language: Английский

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Orthogonal decoupling of ionic-electronic transport microarchitectured vertical array cathode for flexible sodium-ion batteries

Chemical Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Vertically-aligned Na3V2O2(PO4)2F cathodes with orthogonal ion/electron pathways exhibit enhanced Na+ diffusion (5.8 × 10-12 m2 s-1), delivering 131 mA h g-1 at 0.2C, 85 5C, and 96% capacity retention after 1000 cycles for flexible energy storage.

Language: Английский

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