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Lithium cobalt oxide[1]
Lithium-cobalt-oxide-3D-balls.png
Lithium-cobalt-oxide-3D-polyhedra.png
IUPAC name
Other names lithium cobaltite
Identifiers
CAS number 12190-79-3 Yes check.svgY
PubChem 24867970
Properties
Molecular formula LiCoO2
Molar mass 97.87 g mol−1
Hazards
Main hazards harmful
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Lithium cobalt oxide (LiCoO2) is a chemical compound commonly used in the positive electrodes of lithium-ion batteries. The structure of LiCoO2 is known theoretically and has been confirmed with techniques like x-ray diffraction, electron microscopy, neutron powder diffraction, and EXAFS[2]: it consists of layers of lithium that lie between slabs of octahedra formed by cobalt and oxygen atoms.[3] The crystal structure is denoted R\bar 3m [4] in Hermann-Mauguin notation, signifying a rhombus-like unit cell with threefold improper rotational symmetry and a mirror plane. More simply, however, both lithium and cobalt are octahedrally coordinated by oxygen. Each cobalt atom is aligned on a common axis with lithium atoms and separated from each lithium atom by a triangle of oxygen atoms as can be seen in the figures. The threefold rotational axis is termed improper because the oxygen triangles are anti-aligned.

Exposure to soluble cobalt salts can lead to Beer Drinker's Cardiomyopathy.[5] MSDS sheets list lithium cobalt oxide is a potential human carcinogen [3], [4] but indicate "no data available" under the Acute Toxicity heading.[5] However, unlike cobalt(II) salts, this oxide is insoluble in water. Lithium ion batteries contain lithium cobalt oxide and are considered nonhazardous waste. [6] Safety precautions should be taken when handling it.

The compound's usefulness as an intercalation electrode was discovered in 1980 [6] by John B. Goodenough's research group at Oxford.

External links

References

  1. ^ Sigma-Aldrich product page
  2. ^ I. Nakai, K. Takahashi, Y. Shiraishi, T. Nakagome, F. Izumi, Y. Ishii, F. Nishikawa, T. Konishi (1997). [[1] "X-ray absorption fine structure and neutron diffraction analyses of de-intercalation behavior in the LiCoO2 and LiNiO2 systems"]. Journal of Power Sources 68: 536-539. doi:10.1016/S0378-7753(97)02598-6. [2].  
  3. ^ Yang Shao-Horn, Laurence Croguennec, Claude Delmas, E. Chris Nelson and Michael A. O'Keefem (July 2003). "Atomic resolution of lithium ions in LiCoO2". Nature Materials 2 (7): 464–467. doi:10.1038/nmat922.  
  4. ^ H. J. Orman and P. J. Wiseman (January 1984). "Cobalt(III) lithium oxide, CoLiO2: structure refinement by powder neutron diffraction". Acta Crystallographica Section C 40 (1): 12-14. doi:10.1107/S0108270184002833.  
  5. ^ Donald G. Barceloux (1999). "Cobalt". Clinical Toxicology 37 (2): 201-216. http://informahealthcare.com/doi/abs/10.1081/CLT-100102420.  
  6. ^ K. Mizushima, P.C. Jones, P.J. Wiseman, J.B. Goodenough (1980). "LixCoO2 (0<x<l): A NEW CATHODE MATERIAL FOR BATTERIES OF HIGH ENERGY DENSITY". Materials Research Bulletin 15: 783-789.  
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