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2005
Cells
F 3000
37- 019
Reversible Lithium Intercalation into the Three-Dimensional Cluster Network
Structure of Ta6Cl15. — The title compound is prepared by solid state reaction of an
equimolar mixture of Ta powder and TaCl5 at 700 °C. The structure of Ta6Cl15 contains
[Ta6Cl12 ]3+ clusters which are three-dimensionally interconnected by Cl bridges, leaving cavities which are shown to be suitable for lithium insertion. Reversible lithium
intercalation into Ta6Cl15 involves one mol Li per formula unit under equilibrium conditions, when cells are discharged between 3 and 1.8 V, leading to the upper composition LiTa6Cl 15. Although capacity values within this reversible voltage range are small
(≈25 Ah/kg), the cycle life of such Li/Ta6Cl 15 cells is excellent, and the initial capacity
value is maintained over 1500 cycles. On the other hand, a maximum of 15 moles of
lithium can be reacted with one mol Ta6Cl 15 when lithium cells are deep-discharged.
This process is likely due to the complete and irreversible reduction of the parent compound by lithium. — (KUHN*, A.; DILL, S.; MEYER*, H.-J.; Z. Anorg. Allg. Chem.
631 (2005) 9, 1565-1567; Inst. Anorg. Chem., Eberhard-Karls-Univ., D-72076
Tuebingen, Germany; Eng.) — Schramke
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