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Investigation of the Li solubility in the intermediate phase Li17Sn4 relevant to understanding lithiation mechanisms in Sn-based anode materials.

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Title: Investigation of the Li solubility in the intermediate phase Li17Sn4 relevant to understanding lithiation mechanisms in Sn-based anode materials.
Authors: Reichmann, Thomas L.1 Thomas.Reichmann@kit.edu, Gebert, C.1, Cupid, Damian M.1
Source: Journal of Alloys & Compounds. Aug2017, Vol. 714, p593-602. 10p.
Subjects: Lithium compounds, Solubility, Intermediates (Chemistry), Phase transitions, Lithiation, Anodes
Abstract: A comprehensive study of the Li-rich phase boundary of the intermediate Li 17 Sn 4 compound is given based on thermochemical and electrochemical investigations. From the results a partial phase diagram showing the homogeneity range of this phase could be constructed. Using these results, the defect mechanism for the compound Li 17 Sn 4 could also be clarified. Galvanostatic coulometry with potential limitation (GCPL) was performed using 2032 coin cell equipment. This allowed for the determination of the amount of Li insertion on special crystallographic sites at 25 °C, which is 0.41 ± 0.04 at.%. The respective Li loss mechanisms (solid electrolyte interface formation, Li plating, Li trapping) are discussed. Irreversible capacity according to Li trapping could be excluded due to the limited voltage window of the experiments. Moreover, differential scanning calorimetry (DSC) was carried out on two individual Tian-Calvet type calorimeters. The Li-rich boundary of the Li 17 Sn 4 compound was determined at 81.31 ± 0.04 (C-80) and 81.28 ± 0.05 at.% Li (M-HTC) at 427 °C. In addition, the latter results were compared to the change of lattice parameters of alloys with compositions Li 17+x Sn 4 . [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:A comprehensive study of the Li-rich phase boundary of the intermediate Li 17 Sn 4 compound is given based on thermochemical and electrochemical investigations. From the results a partial phase diagram showing the homogeneity range of this phase could be constructed. Using these results, the defect mechanism for the compound Li 17 Sn 4 could also be clarified. Galvanostatic coulometry with potential limitation (GCPL) was performed using 2032 coin cell equipment. This allowed for the determination of the amount of Li insertion on special crystallographic sites at 25 °C, which is 0.41 ± 0.04 at.%. The respective Li loss mechanisms (solid electrolyte interface formation, Li plating, Li trapping) are discussed. Irreversible capacity according to Li trapping could be excluded due to the limited voltage window of the experiments. Moreover, differential scanning calorimetry (DSC) was carried out on two individual Tian-Calvet type calorimeters. The Li-rich boundary of the Li 17 Sn 4 compound was determined at 81.31 ± 0.04 (C-80) and 81.28 ± 0.05 at.% Li (M-HTC) at 427 °C. In addition, the latter results were compared to the change of lattice parameters of alloys with compositions Li 17+x Sn 4 . [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2017.04.232