Communication Dans Un Congrès Année : 2024

Magic-Angle Spinning NMR in a manganese sodium-ion cathode material and in surface-treated lithium titanate

Résumé

1. Abstract High-resolution Magic Angle Spinning NMR can be performed on a wide variety of materials and provide a wide range information on many atoms such as 6Li, 7Li or 23Na and correlation or relaxation experiments can provide information on the localization of lithium or sodium ions and eventually probe phase separation in battery materials. [1,2] Moreover, in favorable systems such as lithium titanates, it has been shown that surface fluorination with XeF2 greatly improves the electrochemical properties. In such systems, high resolution MAS-NMR at high magnetic field can help quantify the amount of fluorine in the structure, and the 19F chemical shift analysis yields information on the fluorine environment. Moreover, spin counting strategies based on Heteronuclear Multiple-Quantum Correlation experiments can provide the number of fluorine atoms which are coordinated to lithium ions and help understand what kind of structures are created locally upon fluorination.[3] 2. Experimental Most experiments on paramagnetic samples were realized at moderate magnetic field (4.7 T or 200 MHz for 1H) with 1.3 mm rotor spinning around 60 kHz under N2 in Bruker spectrometers. For diamagnetic samples such as LTO, high magnetic fields (20 T or 850 MHz for 1H) provided a better signal-to-noise ratio and allowed spin counting experiments to be performed in 1.3 mm rotors. [1] B.Li, G.Rousse, L.Zhang, M.Avdeev, M.Deschamps, A.M.Abakumov, J.-M.Tarascon, Constructing “Li-rich Ni-rich” oxide cathodes for high-energy-density Li-ion batteries Energy Env. Sci. 16, 1210-1222 (2023) [2] Q.Wang, S.Mariyappan, G.Rousse, A.V.Morozov, B.Porcheron, A.Iadecola, R.Dedryvère, J.Wu, W.Yang, L.Zhang, M.Chakir, M.Deschamps, M.-L.Doublet, A.M.Abakumov, J.-M.Tarascon Unlocking anionic redox activity in O3-type sodium 3d layered oxides via Li substitution Nat. Mater. 20, 353–361 (2021) [3] Y.Charles-Blin, D.Flahaut, J.B.Ledeuil, K.Guérin, M.Dubois, M.Deschamps, A.M.Perbost, L.Monconduit, H.Martinez, N.Louvain Atomic Layer Fluorination of the Li4Ti5O12 Surface: A Multiprobing Survey ACS Appl. Energy Mater. 2(9), 6681-6692 (2019)

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Dates et versions

hal-04747454 , version 1 (22-10-2024)

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  • HAL Id : hal-04747454 , version 1

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Sathiya Mariyappan, Nicolas Louvain, Jean-Marie Tarascon, Michaël Deschamps. Magic-Angle Spinning NMR in a manganese sodium-ion cathode material and in surface-treated lithium titanate. 14th Japan-France Joint Seminar on Battery, Shinichi KOMABA, Tokyo University of Science, Japan, Sep 2024, Matsue, Shimane, Japan. ⟨hal-04747454⟩
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