DPG人工石墨粉末衍生物分析研究
The study of derivatives and intermediates in the DPG powders
Date Issued
2007
Date
2007
Author(s)
Syu, Li-Kun
DOI
zh-TW
Abstract
The DPG powders manufactured in the experiment was applied to the anode material for lithium ion secondary battery, and the capacity of
the battery was good. The reversible capacity of DPG powders was over 400 mA/g , even higher than the theoretical value 372mAh/g. However,
the irreversibility of the battery reached 30%.In the HBr rinsed DPG powders, we found one different diffraction peak in the XRD pattern.
The conception of experiments was finding out the possible structure
of the derivatives. At the same time, we calculated the content of the derivative in the DPG powders. Finally, we compared the results of the DPG powders which was manufactured with the different concentration of HBr we used SEM(scanning electron microscopy) to observe the changes on the surface, and used XRD(X-ray diffraction) and EDX(energy dispersive spectrometer) to carry out qualitative analysis, and then decided the possible structure of the derivatives. In the end, we used Rietveld Method to estimate the content of the different derivatives in the DPG powders.
Results from the experiment indicated that there were at least three different kinds of components in the DPG powders: Hexagonal Graphite,
Orthorhombic Carbon, Iron Oxide(Fe2O3). Meanwhile, the content of the three kinds of the derivatives changed with the concentration of HBr and used. We found that content of the Hexagonal Graphite increased with the concentration of HBr we used. However, the content of the
Orthorhombic Carbon decreased with the concentration of HBr we used. It indicated that the Orthorhombic Carbon was more reactive with HBr than the Hexagonal Graphite for the poor crystallinity.
Subjects
DPG人工石墨
Rietveld Method
六方晶石墨。
DPG artificial graphite
Hexagonal Graphite.
Type
thesis
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