Citation: MAO Yan, ZHANG Chuan-Hui, ZHANG Yang, WANG Qi, XU Gui-Liang, HUANG Ling, LI Jun-Tao, SUN Shi-Gang. Synthesis and Electrochemical Performance of Novel Expanded Graphite Oxide/Sulfur Composite Cathodes for Lithium-Sulfur Batteries[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(5): 889-895. doi: 10.3969/j.issn.1001-4861.2013.00.141
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The expanded graphite oxides were prepared by modified Hummers method. The expanded graphite oxide/sulfur (E-GO/S) composites have been successfully prepared by a new chemical reaction method based on comproportionation in the acidic aqueous solution. FT-IR, XPS were characterized the existence of functional groups on the surface of expanded graphite oxide. XRD results showed that the as-prepared sulfur belongs to orthorhombic system. SEM and TEM results indicated the uniform distribution of the sulfur in the composite. The electrochemical test showed that the expanded graphite oxide/sulfur (E-GO/S) composites can deliver the highest discharge capacity of 1 020 mAh·g-1 at the first cycle, after 100 cycles of charge-discharge, the discharge capacity of the composites keep the capacity of ca. 650 mAh·g-1, and have the excellent rate performance and coulombic efficiency that may be attributed to the homogeneous distribution of sulfur in the composites and the chemical approach to fix sulfur and the lithium polysulfides via the chemical bonds with the functional groups on the surface of expanded graphite oxide.
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