A three-dimensional cathode matrix with bi-confinement effect of polysulfide for lithium-sulfur battery

作者：Song, Ren-Sheng; Wang, Bo^*; Ruan, Ting-Ting; Wang, Lei; Luo, Hao; Wang, Fei; Gao, Tian-Tian; Wang, Dian-Long^*

来源：Applied Surface Science, 2018, 427: 396-404.

DOI：10.1016/j.apsusc.2017.09.013

• nt in cycling performance for Li-S battery
• and reversible capacities up to 738 mAh g(-1)
• and 660 mAh g(-1) over 100 and 200 cycles
• are remained at 0.2 C
• rate.KeywordsPolysulfide shuttling
• Li-S battery
• Bi-confinement effect
• Physical confinement
• Chemical confinement

Soluble polysulfide shuttling is still the main cause of restricting the development of lithium-sulfur (Li-S) battery. Here, we propose a novel three-dimensional reduced graphene oxide@sulfur/nitrogen-doped porous carbon polyhedron/carbon nanotubes (rGO@S/NCP/CNTs) composite with bi-confinement effect of polysulfide as an effective cathode material. In rGO@S/NCP/CNTs, NCP provides physical confinement for sulfur and soluble polysulfide by its abundant micropores and mesopores, while oxygen functional groups of rGO provide strong chemical confinement to soluble polysulfide. Additionally, CNTs with one-dimensional conductivity enable facile transport of electrons. Therefore, the resulting rGO@S/NCP/CNTs composite shows an obvious enhancement in cycling performance for Li-S battery, and reversible capacities up to 738 mAh g(-1) and 660 mAh g(-1) over 100 and 200 cycles are remained at 0.2 C rate.

• 出版日期2018-1-1
• 单位哈尔滨工业大学