Lithium ions in the van der Waals gap of Bi{sub 2}Se{sub 3} single crystals
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, v.v.i., 250 68 Rez (Czech Republic)
- Fakulty of Electrical Engeneering and Informatics, University Pardubice Studentska 95, 532 10 Pardubice (Czech Republic)
- Department of Physics, University of Michigan, Ann Arbor, MI 48109-1120 (United States)
Insertion/extraction of lithium ions into/from Bi{sub 2}Se{sub 3} crystals was investigated by means of cyclic voltammetry. The process of insertion is reflected in the appearance of two bands on voltammograms at {approx}1.7 and {approx}1.5 V, corresponding to the insertion of Li{sup +} ions into octahedral and tetrahedral sites of the van der Waals gap of these layered crystals. The process of extraction of Li{sup +} ions from the gap results in the appearance of four bands on the voltammograms. The bands 1 and 2 at {approx}2.1 and {approx}2.3 V correspond to the extraction of a part of Li{sup +} guest ions from the octahedral and tetrahedrals sites and this extraction has a character of a reversible intercalation/deintercalation process. A part of Li{sup +} ions is bound firmly in the crystal due to the formation of negatively charged clusters of the (LiBiSe{sub 2}.Bi{sub 3}Se{sub 4}{sup -}) type. A further extraction of Li{sup +} ions from the van der Waals gap is associated with the presence of bands 3 and 4 placed at {approx}2.5 and {approx}2.7 V on the voltammograms as their extraction needs higher voltage due to the influence of negative charges localized on these clusters. -- Graphical abstract: Insertion/extraction of lithium ions into/from Bi{sub 2}Se{sub 3} layered crystals was investigated by cyclic voltammetry. The extraction of Li{sup +} results in the appearance of four bands on the voltammograms. The first two bands have a character of a reversible process. A part of Li{sup +} ions is bound firmly in the crystal due to the formation of negatively charged clusters of the (LiBiSe{sub 2}.Bi{sub 3}Se{sub 4}{sup -}) type. Their extraction needs higher voltage due to the negative charge. Display Omitted
- OSTI ID:
- 21504027
- Journal Information:
- Journal of Solid State Chemistry, Vol. 183, Issue 12; Other Information: DOI: 10.1016/j.jssc.2010.09.026; PII: S0022-4596(10)00425-1; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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