Improved rate and cycling performances of Na3V2(PO4)2F2O by Ti3+/4+ doping with two oxidation states for sodium cathodes

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-01-01 DOI:10.1016/S1003-6326(24)66677-X

Xiao-fei SUN , Anastase NDAHIMANA , Ling-zhi WANG , Zi-kang WANG , Quan-sheng LI , Wei TANG , Min-xing YANG , Xue-song MEI

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Abstract

Ti at the oxidation states of Ti³⁺ and Ti⁴⁺, was used to enhance the performance of Na₃V₂(PO₄)₂F₂O by partially substituting vanadium. After doping Ti, the crystallographic volume is decreased due to the less radii of Ti^3+/4+, and the valence of Ti is demonstrated identical to V. During sodium insertion in Ti-doped Na₃V₂(PO₄)₂F₂O, the two discharge plateaus split into three because of the rearrangement of local redox environment. Consequently, the optimized Na₃V_0.96Ti_0.04(PO₄)₂F₂O shows a specific capacity of 123 and 63 mA·h/g at 0.1C and 20C, respectively. After 350 cycles at 0.5C, the capacity is gradually reduced corresponding to a retention of 71.05%. The significantly improved performance is attributed to the rapid electrochemical kinetics, and showcases the strategy of replacing V^3+/4+ with Ti^3+/4+ for high-performance vanadium-based oxyfluorophosphates.

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.