Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry, Beihang University , Beijing 100191, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Aug 30;9(34):28366-28376. doi: 10.1021/acsami.7b05825. Epub 2017 Aug 17.
Unusual three-dimensional mesoporous carbon/reduced graphene oxide (MP-C/rGO) matrix possessing graphene nanolayer pore walls built up by three to five graphene monosheets and some carbon particles with the sizes of about 5 nm located between the graphene nanolayers was prepared by facile freeze-drying and then carbonization of the poly(vinyl alcohol) and graphene oxide mixture. The mesoporous carbonaceous MP-C/rGO sample has a high specific surface area of 661.6 m g, large specific pore volume of 1.54 m g, and focused pore size distribution of 2-10 nm. About 64 wt % sulfur could be held in the pores of the MP-C/rGO matrix. As the cathode of a Li-S battery, the MP-C/rGO/S composite showed excellent electrochemical property including a high initial specific capacity of 919 mA h g at 1 C with the capacity retention ratio of 63.3% and the Coulombic efficiency above 90% after 500 cycles. Meanwhile, the initial specific capacity of 602 mA h g at 5 C and remaining capacity of 391 mA h g after 500 cycles with an outstanding Coulombic efficiency of 97% indicate its exceptionally stable rate performance.
一种不常见的三维介孔碳/还原氧化石墨烯（MP-C/rGO）基质，具有由三到五个石墨烯单原子层构成的石墨烯纳米层孔壁，以及一些粒径约为 5nm 的碳原子，位于石墨烯纳米层之间。该介孔碳质 MP-C/rGO 样品具有 661.6m²/g 的高比表面积、1.54m³/g 的大比孔容和 2-10nm 的集中孔径分布。约 64wt%的硫可以被保留在 MP-C/rGO 基质的孔中。作为 Li-S 电池的阴极，MP-C/rGO/S 复合材料表现出优异的电化学性能，包括在 1C 时具有 919mA h/g 的初始比容量，经过 500 次循环后，容量保持率为 63.3%，库仑效率高于 90%。同时，在 5C 时具有 602mA h/g 的初始比容量和 500 次循环后的 391mA h/g 的剩余容量，以及 97%的卓越库仑效率，表明其具有非常稳定的倍率性能。
