Simultaneous Intercalation of Lithium, Potassium and Strontium into Graphite in Molten Salts Medium - Archive ouverte HAL Access content directly
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Simultaneous Intercalation of Lithium, Potassium and Strontium into Graphite in Molten Salts Medium

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Lucie Speyer
Sebastien Cahen
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Claire Hérold

Abstract

The LiCl-KCl molten salts method has been used in order to intercalate strontium into graphite. Combination of X-Ray Diffraction (XRD) experiments and ion beam analyses attests the obtaining of a monophasic sample. Its chemical composition corresponds to the Li 0.2 K 0.6 Sr 0.4 C 6 formula, revealing the synthesis of a quaternary Graphite Intercalation Compound (GIC), in agreement with the high repeat distance of 640 pm determined from its 00 l XRD and with the 1D electronic density profile. The very high-quality data obtained by hk 0 diffraction and rotating crystal method lead to a 2D organization of the intercalated sheet described by a large hexagonal unit cell containing 78 carbon atoms. Such quaternary phase including simultaneously alkali and alkaline-earth metals is unique and can only be prepared from molten salts method, opening new perspectives concerning graphite-based two-dimensional materials.
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Dates and versions

cea-03874442 , version 1 (28-11-2022)

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Inass El Hajj, Lucie Speyer, Sebastien Cahen, Pascal Berger, Ghouti Medjahdi, et al.. Simultaneous Intercalation of Lithium, Potassium and Strontium into Graphite in Molten Salts Medium. 2022. ⟨cea-03874442⟩
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