Ti Substitution Strategy Improves Electrochemical Performance of Na₃V₂(PO₄)₂F₃ Cathode

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1840 - 1850

Published: March 21, 2025

Language: Английский

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

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

Published: April 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.

Language: Английский

Synthesis and electrochemical Properties of porous CuNi2Sn/C Composites as High-Performance Lithium-Ion battery anodes

Materials Science and Engineering B, Journal Year: 2025, Volume and Issue: 319, P. 118370 - 118370

Published: April 28, 2025

Language: Английский