Matériaux d’électrodes négatives graphite-étain pour accumulateur Li-ion : synthèse, caractérisation et propriétés électrochimiques

Abstract : This study is devoted to the development of new anodic materials with high capacities for lithium-ion batteries. The synthesis of graphite-tin systems obtained by reduction, in the presence of graphite at various rates, of the tin Chlorides SnCl2 and SnCl4, by the alkoxide-activated alkaline hydrides ( sodium hydride or lithium hydride) is described. The nanomaterials prepared have stable reversible capacities in cycling, close to those calculated from the amounts of metal given by elemental analysis. However, important differences between the values and the evolution in cycling of the irreversible capacities depending on the hydride or the mixture of hydride used were observed. With sodium hydride, the irreversible capacity, very high during the first cycle, is practically cancelled at the second cycle; with lithium hydride, this irreversible capacity, although lower to the first cycle, gives a recurring residual value at the following cycles. The use of the NaH/LiH allowed to preserve the advantages of the two preceding systems and to synergistically combine their properties.
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Cédric Mercier. Matériaux d’électrodes négatives graphite-étain pour accumulateur Li-ion : synthèse, caractérisation et propriétés électrochimiques. Science des matériaux [cond-mat.mtrl-sci]. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10068⟩. ⟨tel-01746325⟩

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