期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 533, 期 -, 页码 445-451出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.08.093
关键词
Silica nanosphere template; Porous carbon bulk networks; Spatial confinement; Li-S batteries; Superior electrochemical properties
资金
- National Science Foundation of China [51402232]
- Natural Science Basis Research Plan in Shaanxi Province of China [2018JM5085]
- Tang Scholar Program from Cyrus Tang Foundation
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE17308]
In order to suppress the shuttling of soluble lithium polysulfides in Li-S batteries and increase the conductivity of the sulfur cathode, here we report the design and synthesis of three-dimensional (3D) highly ordered porous carbon bulk network (PCBNs), using silica (SiO2) nanospheres as removable hard templates and soluble starch as carbon source. After carbonization and template removal, the as-prepared PCBN5 composed of interconnected hollow carbon balls exhibit large surface area (447.4 m(2)/g) and large pore volume (1.567 cm(3)/g), high graphitization degree and robust framework. Serving as an efficient sulfur host, PCBNs supported sulfur cathode (S@PCBNs with sulfur content of 72 wt%) delivers a high discharge capacity of 760 mA h/g after 150 cycles at 0.1 C and 455 mA h/g after 400 cycles at 1 C. The superior lithium storage properties is attributed to the novel hierarchical microstructure of the PCBNs, in which the large hollow space not only allows high loading of sulfur but also efficiently accommodates the large volumetric expansion. Moreover, the interconnected PCBN5 with high conductivity can spatially confine the shuttling of soluble polysulfides and enhance the redox reaction kinetics. (C) 2018 Elsevier Inc. All rights reserved.
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