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Mnx+ Substitution to Improve Na3V2(PO4)2F3-Based Electrodes for Sodium-Ion Battery Cathode.

ABSTRACT: Na3V2(PO4)2F3 (NVPF) is an extremely promising sodium storage cathode material for sodium-ion batteries because of its stable structure, wide electrochemical window, and excellent electrochemical properties. Nevertheless, the low ionic and electronic conductivity resulting from the insulated PO43- structure limits its further development. In this work, the different valence states of Mnx+ ions (x = 2, 3, 4) doped NVPF were synthesized by the hydrothermal method. A series of tests and characterizations reveals that the doping of Mn ions (Mn2+, Mn3+, Mn4+) changes the crystal structure and also affects the residual carbon content, which further influences the electrochemical properties of NVPF-based materials. The sodiation/desodiation mechanism was also investigated. Among them, the as-prepared NVPF doped with Mn2+ delivers a high reversible discharge capacity (116.2 mAh g-1 at 0.2 C), and the capacity retention of 67.7% after 400 cycles at 1 C was obtained. Such excellent performance and facile modified methods will provide new design ideas for the development of secondary batteries.

SUBMITTER: Su R 

PROVIDER: S-EPMC9920057 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature

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Mn<sup>x+</sup> Substitution to Improve Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F<sub>3</sub>-Based Electrodes for Sodium-Ion Battery Cathode.

Su Renyuan R   Zhu Weikai W   Liang Kang K   Wei Peng P   Li Jianbin J   Liu Wenjun W   Ren Yurong Y  

Molecules (Basel, Switzerland) 20230201 3

Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F<sub>3</sub> (NVPF) is an extremely promising sodium storage cathode material for sodium-ion batteries because of its stable structure, wide electrochemical window, and excellent electrochemical properties. Nevertheless, the low ionic and electronic conductivity resulting from the insulated PO<sub>4</sub><sup>3-</sup> structure limits its further development. In this work, the different valence states of Mn<sup>x+</sup> ions (x = 2, 3, 4) d  ...[more]

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