相位控制和含cqd碳涂层使能高性能Na 3.5 Fe 0.5 V 1.5 (po4) 3阴极

IF 9.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Journal of Materials Chemistry A Pub Date : 2025-09-29 DOI:10.1039/d5ta06954h

Haoyu Guonie, Changwei Shi, Changlian Chen, Chaoqun Shang, Pu Hu

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引用次数: 0

摘要

快速充电钠离子电池（SIBs）需要具有快速氧化还原动力学和坚固结构完整性的正极材料。本文采用柠檬酸辅助喷雾干燥的方法合成了一系列Na 3+x V 2-x Fe x (po4) 3 /C（0≤x≤1）阴极。柠檬酸作为螯合剂和碳源，有效抑制了电化学惰性NaFePO 4杂质的形成，并使含有碳量子点（CQDs）的碳涂层的相纯NASICON框架成为可能。优化组合、Na 3.5铁0.5 V 1.5 (PO 4) 3 / C,提供较高的可逆容量124 mAh在0.5 C和g 95 mAh 20 g 1 C,同时保留93.1%的初始容量在1000周期20 C .详细的动力学分析表明,消除NaFePO 4和复合碳层cqd大大增强铁2 + /铁4 + 3 +和V / V 5 +氧化还原活性,尤其在高效的条件下。该研究强调了相位和界面工程在优化nasicon型阴极中的重要性，并为高功率、长寿命sib提供了可扩展的途径。

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High-Performance Na 3.5 Fe 0.5 V 1.5 (PO 4 ) 3 Cathodes Enabled by Phase Control and CQD-Containing Carbon Coating

Fast-charging sodium-ion batteries (SIBs) demand cathode materials with rapid redox kinetics and robust structural integrity. Herein, a series of Na 3+x V 2-x Fe x (PO 4 ) 3 /C (0 ≤ x ≤ 1) cathodes are synthesized via a citric acid-assisted spray-drying strategy.Citric acid acts as both chelating agent and carbon source, effectively suppressing electrochemically inert NaFePO 4 impurity formation and enabling a phase-pure NASICON framework with a carbon coating containing carbon quantum dots (CQDs).The optimized composition, Na 3.5 Fe 0.5 V 1.5 (PO 4 ) 3 /C, delivers a high reversible capacity of 124 mAh g -1 at 0.5 C and 95 mAh g -1 at 20 C, while retaining 93.1% of its initial capacity over 1000 cycles at 20 C. Detailed kinetic analysis reveals that the elimination of NaFePO 4 and the composite carbon layer with CQDs greatly enhance the Fe 2+ /Fe 3+ and V 4+ /V 5+ redox activity, especially under high-rate conditions. This study underscores the importance of phase and interface engineering in optimizing NASICON-type cathodes and provides a scalable route toward high-power, long-life SIBs.

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来源期刊

Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

19.50

自引率

5.00%

发文量

1892

审稿时长

1.5 months

期刊介绍： The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.