期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 29, 页码 14178-14187出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta04214d
关键词
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资金
- National Key Research and Development Program of China [2018YFB0104201]
- National Natural Science Foundation of China [51674297, 51474243, 51574288]
- Natural Science Foundation of Hunan Province [2016JJ2137]
For further development of lithium-sulfur (Li-S) batteries, it is necessary to construct sulfur hosts with high sulfur utilization/loading ratios and moderate the shuttling effect of lithium polysulfides. Herein, we synthesized uniform pomegranate-like microclusters (MCs) via carbonization of a Prussian blue analogue; the MCs consist of homogeneously inlaid ultrafine Co nanoparticles in nitrogen-doped carbon subunits (Co-NPC). The hierarchical pore structure and high conductivity of the Co-NPC-MCs can immobilize sulfur species, and the ultrafine Co nanoparticles and doped nitrogen exert catalytic effects to improve the electrochemical performance of Li-S batteries. Therefore, the S/Co-NPC-MCs cathode exhibits a high initial capacity of 1192 mA h g(-1) and 941 mA h g(-1) after 200 cycles at 0.5C. It also exhibits excellent rate capacities at high rates of 1C and 2C; the reversible capacities remain at 650 mA h g(-1) and 574 mA h g(-1) after 400 cycles, respectively, demonstrating its great potential for practical applications.
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