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Caractérisation de la réactivité de surface de matériaux d’électrode positive riches en nickel pour batteries Li-ion

Abstract : The electrification of vehicles is currently based on the use of Lithium-ion batteries using lamellar oxides of nickel, manganese and cobalt (NMC) as positive electrode materials. At the industrial level, the production of nickel-rich materials is now the main focus in order to satisfy the need for longer range battery performances demanded by consumers. However, these materials are affected by strong outgassing during battery cycling. Several studies have been conducted to define the main factors contributing to this outgassing and to find the best solutions to reduce it. The majority of this research, though, focuses exclusively on observing the materials during cycling. To address the necessity of a systematic characterisation of Ni rich NMC in its initial state, the surfaces of several industrial samples were observed using different analytical techniques. 7Li MAS-NMR, XPS, STEM-EELS and SEM-FIB were used to obtain a thorough description of the materials and their surfaces. The limitations and complementarities of each technique are discussed and the results obtained compared and exploited in a synergistic way. It was thus possible to describe in detail the surface of the material in its initial state at the nanometric scale and to evaluate the influence of the storage conditions, as well as the electrode preparation steps. The procedure thus defined could then be used to analyse the surface of materials from different synthesis methods.
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Submitted on : Thursday, September 22, 2022 - 11:40:08 AM
Last modification on : Saturday, November 5, 2022 - 4:43:14 AM

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  • HAL Id : tel-03783581, version 1

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Angelica Laurita. Caractérisation de la réactivité de surface de matériaux d’électrode positive riches en nickel pour batteries Li-ion. Matériaux. Nantes Université, 2022. Français. ⟨NNT : 2022NANU4025⟩. ⟨tel-03783581⟩

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