Page 54 - Microsoft PowerPoint - lecture1.ppt

2.3 Basic structure types

Intercalation of layered compounds

• Reversible intercalation of atoms between the layers of a layered compound

• Host-guest interactions, structure-property relations

Example 1: Graphite

• Electron donors (alkali metals, e. g. KC )
8
-
• Electron acceptors (NO , Br , AsF ...)
5
3
2
• Properties: Increase of interlayer spacing, color change,
increase of conductivity, change of electronic structure

Example 2: TiS (CdI -type)
2
2
• Electron donors TiS 2 Li
(alkali metals, copper, organic amines) metal

• Application: Li-TiS -battery
2

+
xLi (metal) → xLi (solv) +xe -
+
xLi (solv) + TiS + xe → Li TiS (s) Li salt in DME/THF
-
2
2
x