Mesoporous carbon with large pore volume and high surface area prepared by a co-assembling route for Lithium-Sulfur Batteries
writer：Jing Wang, Yihuan Wu, Zhiqiang Shi*, Changcheng Wu.
keywords：Mesoporous?carbon，Lithium-sulfur?Batteries，Carbon/sulfur composite，Large?pore?volume，High?surface?area
source：期刊
specific source：Electrochimica Acta
Issue time：2014年
Mesoporous carbon (MC) materials with large pore volume and high surface area have been synthesized as the conductive matrix in the sulfur cathode forthe lithium sulfur (Li/S) batteries using a simultaneous templating and carbonization method. The magnesium citrate is used as the precursor of the carbon and provides nanometer sized MgO particles template. Wide-angle X-ray diffraction (WA-XRD), high-resolution transmission electron microscopy (HR-TEM) and N-2 sorption analysis show that the resultant carbon material possesses mesopores structure (about 6.5 nm), high surface area (1432 m(2) g(-1)), and large pore volumes (2.894 cm(3) g(-1)) after pyrolysis (1000 degrees C). Elemental maps confirm that sulfur is homogeneously dispersed in the MC framework after encapsulation. Electrochemical measurements performed on this mesoporous carbon used as an electrode material for Li/S batteriesshow excellent discharge capacity (1083.6 mAh g(-1)) at current density 200 mAg(-1). The mesopores with large volume and high surface area are crucial in loading insulated sulfur, which provide enough space and good conducting networks for active materials. Meanwhile, mesoporous structure with highadsorption capacity can both effectively accommodate the polysulfide anions and improve the electrochemical performance of Li/S batteries.