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Composite of sulfur impregnated in porous hollow carbon spheres as the cathode of Li-S batteries with high performance 认领 引用 被引量：35
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作者 Kai Zhang Qing Zhao +1 位作者 Zhanliang Tao Jun Chen 《Nano Research》 SCIE CSCD 2013年第1期38-46,共9页
Carbon-sulfur composites as the cathode of rechargeable Li-S batteries have shown outstanding electrochemical performance for high power devices.Here,we report the promising electrochemical charge-discharge properties... Carbon-sulfur composites as the cathode of rechargeable Li-S batteries have shown outstanding electrochemical performance for high power devices.Here,we report the promising electrochemical charge-discharge properties of a carbon-sulfur composite,in which sulfur is impregnated in porous hollow carbon spheres(PHCSs)via a melt-diffusion method.Instrumental analysis shows that the PHCSs,which were prepared by a facile template strategy,are characterized by high specific surface area(1520 m2.g 1),large pore volume(2.61 cm^3·g^-1),broad pore size distribution from micropores to mesopores,and high electronic conductivity(2.22 S·cm-1).The carbon-sulfur composite with a sulfur content of 50.2 wt.%displays an initial discharge capacity of 1450 mA.h·g^-1(which is 86.6%of the theoretical specific capacity)and a reversible discharge capacity of 1357 mA.h·g^-1 after 50 cycles at 0.05 C charge-discharge rate.At a higher rate of 0.5 C,the capacity stabilized at around 800 mA-h·g^-1 after 30 cycles.The results illustrate that the porous carbon-sulfur composites with hierarchically porous structure have potential application as the cathode of Li-S batteries because of their effective improvement of the electronic conductivity,the repression of the volume expansion,and the reduction of the shuttling loss. 展开更多
关键词 porous hollow carbonspheres mesopous/microporousmulti-scale carbon-sulfur compositecathode Li-S batteries
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