Structural Characteristics of Lithium Nickel Phosphate Studied Using Analytical Electron Microscopy and Raman Spectroscopy
Journal
Chemistry of Materials
Journal Volume
18
Journal Issue
16
Start Page
3788
End Page
3794
ISSN
0897-4756
1520-5002
Date Issued
2006-07-14
Author(s)
Abstract
The structural characteristics of lithium nickel phosphate (LiNiPO 4) prepared by solid-state chemical reaction have been studied in detail using the analytical electron microscopy and Raman spectroscopy measurements. The high-resolution transmission electron microscopy and selected area electron diffraction measurements indicate that the grown LiNiPO 4 is well-crystallized in olivine structure without any indication of crystallographic defects such as dislocations or misfits. The energy-dispersive X-ray spectrometry coupled with the elemental compositional mapping using high-angle angular dark field scanning electron microscopy confirms the chemical quality of the grown LiNiPO 4 in terms of homogeneity and uniform elemental distribution characteristics. The local structure and chemical bonding between NiO 6 octahedral and (PO 4) 3- tetrahedral groups probed by Raman spectroscopy also indicate the high-quality of LiNiPO 4. Structural analysis of the delithiated Li 0.09NiPO 4 phase indicates lattice contraction and distortion upon lithium extraction. A detailed analysis and comparison of the pristine and delithiated phases is also reported.
Subjects
Characterization
Crystal defects
Dislocations (crystals)
High resolution electron microscopy
Raman spectroscopy
Scanning electron microscopy
Transmission electron microscopy
High resolution transmission electron microscopy
Lattice contraction
Lithium nickel phosphate
Pristine
Lithium compounds
Publisher
American Chemical Society (ACS)
Type
journal article