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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A high-entropy zero-strain V-based cathode for high performance aqueous zinc-ion batteries

Energy storage materials, Journal Year: 2025, Volume and Issue: 76, P. 104098 - 104098

Published: Feb. 7, 2025

Language: Английский

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Activating Reversible V⁴⁺/V⁵⁺ Redox Couple in NASICON‐Type Phosphate Cathodes by High Entropy Substitution for Sodium‐Ion Batteries

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

Published: Jan. 28, 2025

Abstract Vanadium‐based Na superionic conductor (NASICON) type materials (Na x VM(PO 4 ) 3 , M = transition metals) have attracted extensive attention when used as sodium‐ion batteries (SIBs) cathodes due to their stable structures and large + diffusion channels. However, the poor electrical conductivity mediocre energy density, which hinder practical applications. Activating V 4+ /V 5+ redox couple (V ≈4.1 vs /Na) is an effective way elevate density of SIBs, whereas irreversible phase severe structural distortion will inevitably result in fast capacity fading unsatisfactory rate capability. Herein, a high entropy regulation strategy proposed optimize detailed crystal structure improve reversibility crystalline transformation material. With activated reversible couple, structure, electrochemical kinetics, material 3.2 1.5 Fe 0.1 Al Cr Mn Cu (PO (NVMP‐HE) exhibits outstanding performance with highly specific 120.1 mAh g −1 at C excellent cycling stability (92.4% retention after 1000 cycles 20 C). Besides, situ X‐ray diffraction (XRD) measurement reveals that smooth three‐phase reaction involved this high‐entropy cathode existence mesophase facilitates transition.

Language: Английский

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Regulating Bond Structure in Polyanion Cathode for Long-Cycle-Life Sodium-Ion Batteries

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 2778 - 2787

Published: May 15, 2025

Language: Английский

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