The effect of the anionic framework of Mo6X8 Chevrel Phase (X = S, Se) on the thermodynamics and the kinetics of the electrochemical insertion of Mg2+ ions

M. D. Levi; Eli Lancri; E. Levi; H. Gizbar; Y. Gofer; D. Aurbach

doi:10.1016/j.ssi.2005.04.019

The effect of the anionic framework of Mo₆X₈ Chevrel Phase (X = S, Se) on the thermodynamics and the kinetics of the electrochemical insertion of Mg²⁺ ions

M. D. Levi, Eli Lancri, E. Levi, H. Gizbar, Y. Gofer, D. Aurbach

Department of Chemistry

Bar-Ilan University

Research output: Contribution to journal › Conference article › peer-review

82 Scopus citations

Abstract

The absence of Mg-ion trapping in selenium-based Chevrel phase (in contrast to charge trapping in Mg_xMo₆S₈) was carefully monitored using a combination of three electroanalytical tools: SSCV, PITT and EIS. We discuss the difference between Mg_xMo₆S₈ and Mg_xMo₆Se₈ (0 < x < 2) in terms of the higher polarizability of the host's Se^2- anions framework, compared to that of S^2-, in sulfur-based Chevrel phase, which presents lower diffusion barrier for the mobile Mg ions. In addition, it is shown that the formal equilibrium potential of Mg ions insertion is higher for Mo₆S₈ compared to that of Mo₆Se₈. This difference relates also to the higher stability of the selenium anions framework compared to the sulfur-based anionic system.

Original language	English
Pages (from-to)	1695-1699
Number of pages	5
Journal	Solid State Ionics
Volume	176
Issue number	19-22
DOIs	https://doi.org/10.1016/j.ssi.2005.04.019
State	Published - Jun 2005
Event	Proceedings of the 7th Internatioanl Symposium on Systems with Fast Ionic Transport - Duration: 5 May 2004 → 9 May 2004

Keywords

Chevrel phase
Mg-cation intercalation
MoS
MoSe
Thermodynamics and kinetics of intercalation

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10.1016/j.ssi.2005.04.019

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title = "The effect of the anionic framework of Mo6X8 Chevrel Phase (X = S, Se) on the thermodynamics and the kinetics of the electrochemical insertion of Mg2+ ions",

abstract = "The absence of Mg-ion trapping in selenium-based Chevrel phase (in contrast to charge trapping in MgxMo6S8) was carefully monitored using a combination of three electroanalytical tools: SSCV, PITT and EIS. We discuss the difference between MgxMo6S8 and MgxMo6Se8 (0 < x < 2) in terms of the higher polarizability of the host's Se2- anions framework, compared to that of S2-, in sulfur-based Chevrel phase, which presents lower diffusion barrier for the mobile Mg ions. In addition, it is shown that the formal equilibrium potential of Mg ions insertion is higher for Mo6S8 compared to that of Mo6Se8. This difference relates also to the higher stability of the selenium anions framework compared to the sulfur-based anionic system.",

keywords = "Chevrel phase, Mg-cation intercalation, MoS, MoSe, Thermodynamics and kinetics of intercalation",

author = "Levi, {M. D.} and Eli Lancri and E. Levi and H. Gizbar and Y. Gofer and D. Aurbach",

year = "2005",

month = jun,

doi = "10.1016/j.ssi.2005.04.019",

language = "אנגלית",

volume = "176",

pages = "1695--1699",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

number = "19-22",

note = "Proceedings of the 7th Internatioanl Symposium on Systems with Fast Ionic Transport ; Conference date: 05-05-2004 Through 09-05-2004",

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T1 - The effect of the anionic framework of Mo6X8 Chevrel Phase (X = S, Se) on the thermodynamics and the kinetics of the electrochemical insertion of Mg2+ ions

AU - Levi, M. D.

AU - Lancri, Eli

AU - Levi, E.

AU - Gizbar, H.

AU - Gofer, Y.

AU - Aurbach, D.

PY - 2005/6

Y1 - 2005/6

N2 - The absence of Mg-ion trapping in selenium-based Chevrel phase (in contrast to charge trapping in MgxMo6S8) was carefully monitored using a combination of three electroanalytical tools: SSCV, PITT and EIS. We discuss the difference between MgxMo6S8 and MgxMo6Se8 (0 < x < 2) in terms of the higher polarizability of the host's Se2- anions framework, compared to that of S2-, in sulfur-based Chevrel phase, which presents lower diffusion barrier for the mobile Mg ions. In addition, it is shown that the formal equilibrium potential of Mg ions insertion is higher for Mo6S8 compared to that of Mo6Se8. This difference relates also to the higher stability of the selenium anions framework compared to the sulfur-based anionic system.

AB - The absence of Mg-ion trapping in selenium-based Chevrel phase (in contrast to charge trapping in MgxMo6S8) was carefully monitored using a combination of three electroanalytical tools: SSCV, PITT and EIS. We discuss the difference between MgxMo6S8 and MgxMo6Se8 (0 < x < 2) in terms of the higher polarizability of the host's Se2- anions framework, compared to that of S2-, in sulfur-based Chevrel phase, which presents lower diffusion barrier for the mobile Mg ions. In addition, it is shown that the formal equilibrium potential of Mg ions insertion is higher for Mo6S8 compared to that of Mo6Se8. This difference relates also to the higher stability of the selenium anions framework compared to the sulfur-based anionic system.

KW - Chevrel phase

KW - Mg-cation intercalation

KW - MoS

KW - MoSe

KW - Thermodynamics and kinetics of intercalation

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SN - 0167-2738

VL - 176

SP - 1695

EP - 1699

JO - Solid State Ionics

JF - Solid State Ionics

IS - 19-22

T2 - Proceedings of the 7th Internatioanl Symposium on Systems with Fast Ionic Transport

Y2 - 5 May 2004 through 9 May 2004

ER -

The effect of the anionic framework of Mo₆X₈ Chevrel Phase (X = S, Se) on the thermodynamics and the kinetics of the electrochemical insertion of Mg²⁺ ions

Abstract

Keywords

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