Raman scattering of LiNi1−yAlyO2
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| Title: | Raman scattering of LiNi |
|---|---|
| Authors: | Julien, C.1 cjul@ccr.jussieu.fr, Massot, M.2 |
| Source: | Solid State Ionics. May2002, Vol. 148 Issue 1/2, p53. 7p. |
| Subjects: | Lithium compounds, Raman effect |
| Abstract: | We measured Raman spectra from LiNiO2 and LiNi1−yAlyO2 positive electrode materials for lithium-ion batteries. LiNiO2 oxide is unambiguously shown to have a layered rock-salt structure (R3¯m space group), which exhibits two Raman bands at 465 and 545 cm−1 assigned to the Eg and A1g species, respectively. Whereas LiNi1−yAlyO2 prepared at low temperature (450 °C) using the succinate sol–gel method develops a spinel structure, LiNi1−yAlyO2 prepared by the citrate route is a microcrystalline oxide indicating the α-NaFeO2 structure (R3¯m). The shift of the Raman peak positions suggest that replacement of Ni by Al increases the elementary cell volume and changes the intralayer bond covalency of LiNi1−yAlyO2, in good accordance with the X-ray diffraction (XRD) measurements. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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