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| 2012 | Wang, Da-Wei, Zhou, Guangmin, Li, Feng, Wu, Kuang-Hsu, Lu, Gao Qing (Max), Cheng, Hui-Ming and Gentle, Ian R. (2012) A microporousmesoporous carbon with graphitic structure for a high-rate stable sulfur cathode in carbonate solvent-based LiS batteries. Physical Chemistry Chemical Physics, 14 24: 8703-8710. |
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A microporousmesoporous carbon with graphitic structure was developed as a matrix for the sulfur cathode of a LiS cell using a mixed carbonate electrolyte. Sulfur was selectively introduced into the carbon micropores by a melt adsorptionsolvent extraction strategy. The micropores act as solvent-restricted reactors for sulfur lithiation that promise long cycle stability. The mesopores remain unfilled and provide an ion migration pathway, while the graphitic structure contributes significantly to low-resistance electron transfer. The selective distribution of sulfur in micropores was characterized by X-ray photoelectron spectroscopy (XPS), nitrogen cryosorption analysis, transmission electron microscopy (TEM), X-ray powder diffraction and Raman spectroscopy. The high-rate stable lithiationdelithiation of the carbonsulfur cathode was evaluated using galvanostatic chargedischarge tests, cyclic voltammetry and electrochemical impedance spectroscopy. The cathode is able to operate reversibly over 800 cycles with a 1.8 C dischargerecharge rate. This integration of a micropore reactor, a mesopore ion reservoir, and a graphitic electron conductor represents a generalized strategy to be adopted in research on advanced sulfur cathodes.
| |  Dr Da-Wei Wang,  Professor Ian Gentle, Professor Max Lu | | eSpace Record: |
http://espace.library.uq.edu.au/view/UQ:275790
| | | | | Links: | Full text from publisher |
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