𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Chemical Synthesis and Properties of Spinel Li1−xCo2O4−δ

✍ Scribed by S. Choi; A. Manthiram

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
240 KB
Volume
164
Category
Article
ISSN
0022-4596

No coin nor oath required. For personal study only.

✦ Synopsis

Spinel Li 1Àx Co 2 O 4Àd samples with 0.44r(1Àx)r1 have been synthesized by chemically extracting lithium with the oxidizer NO 2 BF 4 in acetonitrile medium from the LT-LiCoO 2 synthesized at 4001C. Rietveld analysis of the X-ray diffraction data reveals that the Li 1Àx Co 2 O 4Àd samples adopt the normal cubic spinel structure with a cation distribution of (Li 1Àx ) 8a [Co 2 ] 16d O 4Àd . Redox iodometric titration data indicate that the LT-LiCoO 2 tends to lose oxygen on extracting lithium and the spinel Li 1Àx Co 2 O 4Àd samples are oxygen-deficient. Both infrared spectroscopic and magnetic susceptibility data suggest that the LiCo 2 O 4Àd spinel is metallic with itinerant electrons. The tendency to lose oxygen on extracting lithium from the LT-LiCoO 2 and the observed metallic behavior of the spinel LiCo 2 O 4Àd are explained on the basis of a qualitative band diagram.

📜 SIMILAR VOLUMES

Structural and Transport Properties of M
Structural and Transport Properties of Mg1−xMnxMn2O4±δ Spinels
✍ Lorenzo Malavasi; Paolo Ghigna; Gaetano Chiodelli; Giorgio Maggi; Giorgio Flor 📂 Article 📅 2002 🏛 Elsevier Science 🌐 English ⚖ 180 KB

The synthesis and structural properties of Mg 1؊x Mn 2؉x O 4 , for 04x41 are described. Complete miscibility in the solid state exists for this system. For the material with the correct stoichiometry, i.e. MgMn 2 O 4 , the e4ect of temperature on the cation distribution was investigated: above 6003C

Chemical and Magnetic Characterization o
Chemical and Magnetic Characterization of Spinel Materials in the LiMn2O4–Li2Mn4O9–Li4Mn5O12System
✍ Christian Masquelier; Mitsuharu Tabuchi; Kazuaki Ado; Ryoji Kanno; Yo Kobayashi; 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 451 KB

packed structures was further extended by Goodenough's group to 3-D materials with the spinel structure (3). It was Lithium manganospinels belonging to the LiMn 2 O 4 -Li 2 Mn 4 O 9 -Li 4 Mn 5 O 12 system were prepared by solid-state reac-shown that lithium could be intercalated into the spinels tio