Structure stability of LixHyV3O8 exposed to water-vapour
by Mário Simões; Lassi Karvonen; Alexandra Maegli; Songhak Yoon; Simone Pokrant; Anke Weidenkaff; Yoann Mettan
International Journal of Nanotechnology (IJNT), Vol. 11, No. 9/10/11, 2014

Abstract: Chemically lithiated LixHyV3O8 was prepared as the starting material in this study owing to its interesting properties for lithium-ion intercalation and further application in the positive electrode of lithium-ion batteries. The hydrophilic character of the synthesised compound was evaluated because even ppm water level inside batteries containing electrolytes with fluorinated salts like LiPF6 can dramatically influence the battery stability. The structural stability of the lithiated vanadate after exposure to water-vapour was evaluated ex situ by XRD, TGA and TEM. TGA showed that at least 4 wt.% of water can be incorporated into the material. Water intercalates in the vanadate lattice filling the particles from the outer shell towards the bulk. Prolonged exposure to water-vapour saturated atmosphere leads to irreversible exfoliation of the crystal structure. Weakly bonded intercalated water can be removed without any damage to the crystal structure by an annealing step at 200°C for 2 h in air.

Online publication date: Wed, 14-Jan-2015

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