Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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L.Afonso de Araujo, V.Sarou-Kanian, D.Sicsic, M.Deschamps, E.Salager, 'Operando nuclear magnetic resonance spectroscopy: detection of the onset of metallic lithium deposition on graphite at low temperature and fast charge in a full Li-ion battery', J. Magn. Reson. 354 107527 (2023) doi:10.1016/j.jmr.2023.107527

Lithium-ion batteries are at the core of the democratisation of electric transportation and portative electronic devices. However, fast and/or low temperature charge induce performance loss, mainly through lithium plating, a degrading mechanism. In this report, 7Li operando Nuclear Magnetic Resonance spectroscopy is used to detect the onset of metastable lithium deposits in an NMC622/graphite cell at 0 °C and fast charge. An operando setup, compatible with low temperatures, was developed with special attention to the pressure applied on the electrodes/separator stack and noise reduction to enable early detection and good time-resolution. Direct detection of metallic lithium enables drawing correlations between lithium plating and electrochemical data.