期刊
NANOSCALE
卷 11, 期 15, 页码 7440-7446出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr09495k
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资金
- National Key R&D Program of China [2016YFA0200102, 2017YFA0206301]
- National Natural Science Foundation of China [51631001, 51590882, 51672010, 81421004]
- Natural Science Foundation of Beijing Municipality [2191001]
Lithium sulfur (Li-S) batteries, which have high theoretical capacity, are promising candidates for energy storage systems; however, several obstacles, including insulating nature and volumetric expansion of sulfur as well as shuttle effects of polysulfides, impede the commercialization of these batteries. Herein, we utilized mesoporous N-doped graphene (NGM) as a sulfur host, which was synthesized using a type of triblock copolymer, Pluronic F127 (PF127), as a soft template. PF127 not only acted as a spacer to prevent the graphene layers from restacking during the hydrothermal reaction, but also resulted in the formation of high-density wrinkles on the surface of the graphene sheets after annealing. The crumpled NGM with a nitrogen doping content of 4.80 at% had the high specific area and total pore volume of up to 958.72 m(2) g(-1) and 2.39 cm(3) g(-1), respectively, providing space for the accommodation and uniform distribution of sulfur in the cathode. Therefore, the sulfur content was increased to 87.2 wt% in the graphene sulfur composite, achieving the discharge capacity of 492.2 mA h g(TE)(-1) at 1.08 A g(TE)(-1) with a low capacity decay rate of 0.12% per cycle after 400 cycles. Thus, this study provides an effective strategy for enhancing the specific surface area and pore volume of graphene to develop Li-S batteries with high performance.
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