LITHIUM INSERTION IN ISOMORPHOUS MO2(B) STRUCTURES

被引：38

作者：

ZACHAUCHRISTIANSEN, B ^{[1
]}

WEST, K ^{[1
]}

JACOBSEN, T ^{[1
]}

SKAARUP, S ^{[1
]}

机构：

[1] TECH UNIV DENMARK, PHYS LAB 3, DK-2800 LYNGBY, DENMARK

来源：

SOLID STATE IONICS | 1992年 / 53卷

关键词：

D O I：

10.1016/0167-2738(92)90401-A

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The MO2(B) lattice is an extensively sheared ReO3 derivative with only 2x2 ReO3 blocks left, and is thus a rather rigid structure. VO2(B), TiO2(B), FeV3O8, and AlNbO4 can all be synthesized with this structure. Chemical lithiation at 25-degrees-C resulted in maximal uptakes of 0.8, 0.65, 0.32, and 0.05 Li/MO2 for TiO2(B), VO2(B), FeV3O8, and AlNbO4, respectively. X-ray diffraction of lithiated samples showed virtually no changes of the a, c, and beta parameters of the monoclinic cell, while the beta-axis exhibited an expansion of ca 5%. AlNbO4 retained its lattice dimensions. Electrochemical Li uptake in cells with LiCF3SO3-PEO electrolyte operated at 100-degrees-C with constant current discharge (50 muA/cm2) resulted in uptake of 0.75, 1.0, 0.75, and 1.0 Li/MO2 for TiO2(B), VO2(B), FeV3O8 and AlNbO4. VO2(B), FeV3O8 and AlNbO4 exhibited phase separation, while TiO2(B) inserted Li homogeneously. The potential plateau for LixFeV3O8 was almost-equal-to 150 mV higher than for LixVO2 (B), due to the presence of pentavalent vanadium in FeV3O8.

引用

页码：364 / 369

页数：6

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