Issue 5, 2004

Intercalation materials from azamacrocycles and layered sulfides: electrical and electrochemical behaviour

Abstract

The intercalation of poly-oxo-aza-macrocyclic compounds (azacrowns, AZC) in layered sulfides, such as TiS2 and TaS2, giving MS2(AZC)n (M = Ta, Ti; n ≈ 0.2) compounds, takes place at 200 °C during 2 days of contact time between the MS2 and the AZC in the absence of air. The basal spacing increase of about 0.4 nm is compatible with the thickness of the macrocycle in a pseudo-planar arrangement between the sulfide layers. The intercalation compounds exhibit good thermal stability. The TaS2 derivatives show superconducting behaviour with Tc values close to 3 K. The resistivity of pristine sulfides is strongly increased by the AZC intercalation. Electrochemical insertion of lithium could be carried out in a reversible manner, the diffusion coefficients, determined from GITT pulse-relaxation experiments, being two orders of magnitude lower than in Li intercalation of the pristine sulfides.

Graphical abstract: Intercalation materials from azamacrocycles and layered sulfides: electrical and electrochemical behaviour

Article information

Article type
Paper
Submitted
24 Sep 2003
Accepted
12 Dec 2003
First published
21 Jan 2004

J. Mater. Chem., 2004,14, 824-829

Intercalation materials from azamacrocycles and layered sulfides: electrical and electrochemical behaviour

A. Villanueva and E. Ruiz-Hitzky, J. Mater. Chem., 2004, 14, 824 DOI: 10.1039/B311854A

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