Mesoporous carbon with large pore volume and high surface areaprepared by a co-assembling route for Lithium-Sulfur Batteries
作者：Jing Wang, Yihuan Wu, Zhiqiang Shi?, Changcheng Wu
關鍵字：Mesoporous carbon, Lithium-sulfur Batteries, Carbon/sulfur composite, Large pore volume, High surface areaa
論文來源：期刊
具體來源：Electrochimica Acta 144 (2014) 307–314
發表時間：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 for the 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 N2 sorption analysis show that the resultant carbon
material possesses mesopores structure (about 6.5 nm), high surface area (1432
m2g-1), and large pore volumes (2.894 cm3 g-1) after pyrolysis (1000
℃). 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 batteries show
excellent discharge capacity (1083.6 mAh g-1) at current density 200 mA g-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 high adsorption capacity
can both effectively accommodate the polysulfide anions and improve the
electrochemical performance of Li/S batteries.