TEM and electron tomography studies of carbon nanospheres for lithium secondary batteries
The structure of carbon nanospheres of 100–200 nm diameter, which showed superior high-speed charge–discharge behavior as the negative electrode in a lithium ion battery, was investigated with XRD, SEM and TEM with an electron tomography attachment. Observation of carbon 0 0 2 lattice images, as wel...
Gespeichert in:
Veröffentlicht in: | Carbon (New York) 2006-10, Vol.44 (12), p.2558-2564 |
---|---|
Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | The structure of carbon nanospheres of 100–200
nm diameter, which showed superior high-speed charge–discharge behavior as the negative electrode in a lithium ion battery, was investigated with XRD, SEM and TEM with an electron tomography attachment. Observation of carbon 0
0
2 lattice images, as well as electron diffraction patterns, illustrated that heterogeneous microtexture was formed as the polyhedronization of the particle proceeded with heat-treatment. The outside region of the particle heat-treated at 2800
°C has stacking structure of aromatic layers with some distribution of
d
002, while the center region consisted of non-graphitic. Structure defects seemed to be concentrated along the ridgelines of the polyhedronized particles after heat-treatment. The electron tomography technique clarified the morphology of the graphitized particles, although the images should be understood with other crystallographic measurements. A slice image computed in the 3D-reconstruction process showed the inner texture of the graphitized particles more clearly than the conventional TEM bright-field image. |
---|---|
ISSN: | 0008-6223 1873-3891 |
DOI: | 10.1016/j.carbon.2006.05.041 |