Sodium vanadium fluorophosphate structure -Lithium - Ion Battery Equipment

Structural controversy of sodium vanadium fluorophosphate -Lithium - Ion Battery Equipment

Na-ion batteries are highly competitive in large-scale energy storage applications due to their abundant raw materials and low cost. Among them, sodium vanadium fluorophosphate, a polyanionic sodium ion cathode material, has become a research hotspot of researchers all over the world because of its high working potential platform, high thermal stability and large theoretical discharge specific capacity. However, there has been controversy in the structural study of sodium vanadium fluorophosphate materials.

Recently, Professor Xu Youlong from the Institute of Advanced Energy Storage Electronic Materials and Devices, Xi'an Jiaotong University instructed doctoral students to use in-situ and ex-situ XRD and electrochemical tests to study the chemistry of raw materials in solid-phase synthesis and electrochemical ion exchange. reaction mechanism. The results show that there are only two synthesizable structures of sodium vanadium fluorophosphate, namely tetragonal Na3V2(pO4)2F3 and tavorite-type monoclinic NaVpO4F. This work eliminates the current scientific research community's controversy on the understanding of the material's structure, clarifies the misunderstanding of many scientific researchers on the material, and lays a theoretical foundation for the future application of the material.(Lithium - Ion Battery Equipment)

The above research results were published in Advanced Energy Materials (IF=21.875) under the title of "FluorophosphatesfromSolid-StateSynthesisandElectrochemicalIonExchange:NaVpO4ForNa3V2(pO4)2F3?". Li Long, a doctoral student at the Institute of Advanced Energy Storage Electronic Materials and Devices, Xi'an Jiaotong University, is the first author of this paper, and Professor Xu Youlong and Professor Li Ju from MIT are the co-corresponding authors of this paper. The School of Telecommunications of Xi'an Jiaotong University is the first signatory unit of this paper, which marks Xi'an Jiaotong University's major breakthrough in the research of cathode materials for sodium-ion batteries.

This work is supported by the National Natural Science Foundation of China, the "111 Talent Introducing Program" and the Shaanxi Provincial Major R&D Program.



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