Abstract
The MO 2(B) lattice is an extensively sheared ReO 3 derivative with only 2×2 ReO 3 blocks left, and is thus a rather rigid structure. VO 2(B), TiO 2(B), FeV 3O 8, and AlNbO 4 can all be synthesized with this structure. Chemical lithiation at 25°C resulted in maximal uptakes of 0.8, 0.65, 0.32, and 0.05 Li/MO 2 for TiO 2(B), VO 2(B), FeV 3O 8, and AlNbO 4, respectively. X-ray diffraction of lithiated samples showed virtually no changes of the a, c, and β parameters of the monoclinic cell, while the b-axis exhibited an expansion of ca 5%. AlNbO 4 retained its lattice dimensions. Electrochemical Li uptake in cells with LiCF 3SO 3-PEO electrolyte operated at 100°C with constant current discharge (50 μA/cm 2) resulted in uptake of 0.75, 1.0, 0.75, and 1.0 Li/MO 2 for TiO 2(B), VO 2(B), FeV 3O 8 and AlNbO 4. VO 2(B), FeV 3O 8 and AlNbO 4 exhibited phase separation, while TiO 2(B) inserted Li homogen eously. The potential plateau for Li x FeV 3O 8 was ≈150 mV higher than for Li x VO 2(B), due to the presence of pentavalent vanadium in FeV 3O 8.
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