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Sur l'intercalation dans le graphite des alliages lithium-calcium

Abstract : The study of the graphite-lithium-calcium system leads to the formation of three novel intercalation compounds called [alpha], [bêta] and [gamma]. The synthesis of these ternary phases is carried out at 350°C by immersion of a pyrographite platelet in a molten Li-Ca alloy whose composition is judiciously chosen. The presence of lithium in these compounds requires nuclear microprobe analysis in order to determine the elemental composition. The compound possesses a high metal quantity (C/Metal ratio near 1) especially in lithium. The g phase contains a very small lithium amount and its chemical formula is close to CaC6. A structural study allowed to determine the a phase lattice. Along the c-axis, the intercalated sheets are five-layered according to a Li-Ca-Li-Ca-Li sequence that is close to the CaLi2 structure. 7Li NMR confirms these results. The compound contains thicker intercalated sheets that become seven-layered. The in-plane lattice of the g phase corresponds to that of CaC6.
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Submitted on : Thursday, March 29, 2018 - 10:45:44 AM
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  • HAL Id : tel-01746831, version 1



Sébastien Pruvost. Sur l'intercalation dans le graphite des alliages lithium-calcium. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2003. Français. ⟨NNT : 2003NAN10153⟩. ⟨tel-01746831⟩



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