Mg-Doped Li2FeTiO4 as a High-Performance Cathode Material Enabling Fast and Stable Li-ion Storage

Inorganics, Journal Year: 2025, Volume and Issue: 13(3), P. 76 - 76

Published: March 6, 2025

As a multi-electron system material, the excellent capacity and environmentally benign properties of Li2FeTiO4 cathodes make them attractive for lithium-ion batteries. Nevertheless, their electrochemical performance has been hampered by poor conductivity limited ion transport. In this work, synthesis Mg-doped Li2MgxFe1−xTiO4 (LiFT-Mgx, x = 0, 0.01, 0.03, 0.05) cathode materials was successfully achieved. We observed significant gains in interlayer spacing, ionic conductivity, kinetics. Hence, sample LiFT-Mg0.03 demonstrated charming initial (112.1 mAh g−1, 0.05 C), stability (85.0%, 30 cycles), rate capability (96.5 85.9%). This research provided precious insights into lithium storage with exceptional long-term potential to drive development next-generation energy technologies.

Language: Английский

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High‐Entropy‐Based Micro‐Doping Enables High‐Energy‐Density and Stable Layered Sodium Oxide Cathodes

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

Published: April 13, 2025

Abstract Transition metal layered oxides are regarded as commercially viable cathode materials for sodium ion batteries (SIBs), but the inadequate rate capability and cyclability significantly impede their practical application. Here, a high‐entropy‐based micro‐doping strategy has been proposed to prepare an O3‐type Na 0.9 (NiFeMn) 0.3 (CuMgAlTiSn) 0.02 O 2 (HE‐NFM) cathode, delivering ultrahigh energy density of 442 Wh kg⁻¹ at 0.1 C. The HE‐NFM simultaneously achieves high‐rate (104.4 mAh g⁻¹ C) excellent (95% capacity after 100 cycles 1 C), outperforming undoped ternary counterparts (NFM). DFT calculations confirm reduced Na⁺ migration barriers lower formation through entropy‐mediated stabilization engineering, synergistically enhancing phase stability + kinetics. This establishes paradigm concurrently optimizing in SIBs cathodes.

Language: Английский

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

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

Published: May 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.

Language: Английский

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CO2-resistance calcium doped La0.7Ca0.15Sr0.15Co0.3Fe0.7O3 perovskite hollow fiber membrane for oxygen permeation

Journal of Membrane Science, Journal Year: 2025, Volume and Issue: unknown, P. 124194 - 124194

Published: May 1, 2025

Language: Английский

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Preparation of high-performance asymmetric supercapacitor self-supported electrodes with (NiCoCuCrMn)Se cathode and FeSe2 anode by microwave method

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1010, P. 178073 - 178073

Published: Dec. 12, 2024

Language: Английский

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