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

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2025-03-21 DOI:10.1021/acsenergylett.5c00315

Qingxia Hu, Mengjiao Sun, Yunchun Zha, Guiquan Zhao, Hanlin Tang, Li Yang, Mou Yang, Bohuai Pang, Yongjiang Sun, Hong Guo

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引用次数: 0

Abstract

NASICON-type Na₃V₂(PO₄)₂F₃ (NVPF) is a promising cathode for sodium-ion batteries (SIBs), but its performance is hindered by Na₃V₂(PO₄)₃ (NVP) impurities and intrinsic limitations. To overcome these challenges, Ti-substituted NVPF cathodes are successfully synthesized using the sol–gel method in this study. Theoretical calculations and advanced analyses confirm that substituting Ti ions for V in the NVPF lattice effectively eliminates NVP impurities, mitigates the low-voltage plateau issue, and enhances both electronic conductivity and sodium-ion diffusion kinetics. Hence, the optimized Na₃V₁.₉₅Ti₀.₀₅(PO₄)₂F₃ cathode demonstrated a high initial capacity of 129.10 mAh g^–1 at 0.2 C. Notably, it exhibited excellent cycling stability, with capacity retentions of 91.98% after 500 cycles at 5 C and 81.14% after 6000 cycles at 30 C, significantly outperforming the unsubstituted NVPF sample. This study provides a practical new approach for the development of high-performance cathode materials for SIBs and is expected to accelerate the commercialization process of SIBs.

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Ti取代策略改善Na3V2(PO4)2F3阴极的电化学性能

nasiconon型Na3V2(PO4)2F3 （NVPF）是一种很有前途的钠离子电池（sib）阴极材料，但其性能受到Na3V2(PO4)3 （NVP）杂质和内在限制的影响。为了克服这些挑战，本研究采用溶胶-凝胶法成功合成了ti取代的NVPF阴极。理论计算和高级分析证实，在NVPF晶格中用Ti取代V可以有效地消除NVP杂质，缓解低压平台问题，并提高电子导电性和钠离子扩散动力学。因此，优化后的Na3V1.95Ti0.05(PO4)2F3阴极在0.2℃下具有129.10 mAh g-1的高初始容量，且具有良好的循环稳定性，在5℃下循环500次后容量保留率为91.98%，在30℃下循环6000次后容量保留率为81.14%，明显优于未替代的NVPF样品。本研究为sib高性能正极材料的开发提供了一条实用的新途径，有望加快sib的商业化进程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.