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  Unlocking fast and reversible sodium intercalation in NASICON Na4MnV(PO4)3 by fluorine substitution

Hou, J., Hadouchi, M., Sui, L., Liu, J., Tang, M., Kan, W. H., et al. (2021). Unlocking fast and reversible sodium intercalation in NASICON Na4MnV(PO4)3 by fluorine substitution. Energy Storage Materials, 42, 307-316. doi:10.1016/j.ensm.2021.07.040.

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Hou, Jingrong1, Author
Hadouchi, Mohammed1, Author
Sui, Lijun1, Author
Liu, Jie1, Author
Tang, Mingxue1, Author
Kan, Wang Hay1, Author
Avdeev, Maxim1, Author
Zhong, Guiming1, Author
Liao, Yi-Kai1, Author
Lai, Yu-Hong1, Author
Chu, Ying-Hao1, Author
Lin, Hong-Ji1, Author
Chen, Chien-Te1, Author
Hu, Zhiwei2, Author              
Huang, Yunhui1, Author
Ma, Jiwei1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              

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 Abstract: The exploitation of high energy and high power densities cathode materials for sodium ion batteries is a challenge. Na-super-ionic-conductor (NASICON) Na4MnV(PO4)3 is one of promising high-performance and low-cost cathode materials, however, still suffers from not reaching the theoretical capacity, low rate capability, and poor cycling stability. In this work, we deploy a novel sodium-deficient NASICON fluorinated phosphate cathode material for sodium ion batteries which demonstrates, notably, high energy and high power densities concomitant with high sodium diffusion kinetics. The enhanced performance of this novel Na3.85⬜0.15MnV(PO3.95F0.05)3 cathode was evidenced by demonstrating a relatively high energy density of ∼380 Wh kg−1 at low rate with much improved rate capability compared to non-doped Na4MnV(PO4)3, and long cycling life over 2000 cycles at high current rates. The structural investigation during battery operation using in situ x-ray diffraction (XRD) reveals bi-phase mechanism with high structural reversibility. The combined XRD and 23Na nuclear magnetic resonance (NMR) analyses demonstrate that the sodium extraction/insertion from Na2 is faster than Na1 site. These findings open promising prospects for unlocking of high energy and high power densities of NASICON phosphate materials by fluorine substitution towards high-performance sodium ion batteries. © 2021 Elsevier B.V.

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Language(s): eng - English
 Dates: 2021-07-302021-07-30
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1016/j.ensm.2021.07.040
BibTex Citekey: Hou2021307
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Title: Energy Storage Materials
Source Genre: Journal
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Publ. Info: Elsevier
Pages: - Volume / Issue: 42 Sequence Number: - Start / End Page: 307 - 316 Identifier: ISSN: 2405-8297
CoNE: https://pure.mpg.de/cone/journals/resource/2405-8297