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, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 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

Language: Английский

---

Strengthening Transition Metal–Oxygen Interaction in Layered Oxide Cathodes for Stable Sodium-Ion Batteries

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

P2-type layered oxides, such as Na0.67Ni0.33Mn0.67O2, represent a promising class of cathode materials for Sodium-ion batteries (SIBs) due to their high theoretical energy density. However, cycling stability is often compromised by severe phase transitions and irreversible lattice oxygen redox reactions at voltages. In this work, we develop Zn Al codoping approach design Na0.71Ni0.28Zn0.05Mn0.62Al0.05O2 (ZA-NNMO) stable SIBs. Geometric analysis reveals that the introduction inert significantly mitigates distortion transition-metal-ion migration, thereby inhibiting detrimental transition structural collapse. The doped element in Mn site strengthens Al-O interaction, facilitating reversible O2--O2n- (0 < n 4) voltages effectively curtailing oxidation, confirmed situ differential electrochemical mass spectrometry. As result, ZA-NNMO delivers superior performance terms output voltage 3.6 V, highly competitive density 470 W h kg-1 good cyclability (80.2% capacity retention after 1400 cycles 1.0 A g-1). This work presents robust methodology improving reversibility oxide cathodes

Language: Английский

---

Recent Progress on Organic Liquid Electrolyte for High‐Temperature Sodium Batteries

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

Published: Feb. 26, 2025

Abstract Sodium batteries are considered promising candidates for large‐scale energy storage systems due to abundant sodium resources and low costs. However, suffer from serious transition metal dissolution, undesirable side reactions, increased thermal runaway risk at elevated operation temperatures. Electrolyte, as a key component of batteries, is closely related temperature tolerance. Herein, we focus on recent achievements in organic liquid electrolyte high‐temperature batteries. First, the failure mechanisms discussed Subsequently, introduce components summarize effective optimization strategies including salt selection, concentration regulation, solvents optimization, additives. Finally, further directions proposed. It believed that this review can provide whole picture insight into design

Language: Английский

---

Structural Modulation of Cu‐Mn‐Fe Prussian Blue Analogs for Practical Sodium Ion Cylinder Cells

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

Published: March 19, 2025

Abstract High‐performance, cost‐effective cathodes are essential for grid‐scale sodium‐ion batteries (SIBs). Prussian blue analogs (PBAs) have shown great potential as SIB cathodes, but achieving both high capacity and long lifespan remains challenging. In this study, a series of low‐cost ternary PBAs synthesized through structural regulation is presented to simultaneously achieve capacity, stable cycling performance, broad temperature adaptability. Among them, CuHCF‐3 demonstrates specific 132.4 mAh g −1 with 73.3% retention over 1000 cycles. In‐depth analyses, using in situ techniques density functional theory calculations, reveal highly reversible three‐phase transition (monoclinic ↔ cubic tetragonal) Na 1.96 Cu 0.45 Mn 0.55 [Fe(CN) 6 ] 0.91 ·□ 0.09 ·2.14H 2 O (CuHCF‐3), which driven by synergistic interactions between Cu. enhances conductivity, increases the operating voltage, introduces additional redox centers, while mitigates Jahn–Teller distortions associated buffers volume changes during cycling. This synergy results excellent stability across wide range (−20 55 °C). 18650‐type cylindrical cells based on loading 73.54% 850 study offers valuable insights designing durable, high‐capacity electrode materials energy storage applications.

Language: Английский

---

Tailoring NaNiFeMnO₂ with zirconium and antimony for enhanced stability and capacity in sodium-ion batteries

Materials Today Communications, Journal Year: 2025, Volume and Issue: unknown, P. 112646 - 112646

Published: April 1, 2025

Language: Английский

---