کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1417829 | 985979 | 2006 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: TEM and electron tomography studies of carbon nanospheres for lithium secondary batteries TEM and electron tomography studies of carbon nanospheres for lithium secondary batteries](/preview/png/1417829.png)
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 d002, 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.
Journal: Carbon - Volume 44, Issue 12, October 2006, Pages 2558–2564