期刊
JOURNAL OF POWER SOURCES
卷 341, 期 -, 页码 68-74出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.11.114
关键词
Sandwich structure; Reduced graphene oxide; Mesoporous carbon; Polysulfides reservoirs; Lithium-sulfur batteries
资金
- National Key Basic Research Program of China [2014CB921004]
- Chinese Academy of Sciences [KGZD-EW-202-2]
- NSFC [51325206]
- China Postdoctoral Science Foundation [2015LH0026, 2015M581667]
- Science Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics and Superfine Microstructures [SKL201303]
Confinement of sulfur and alleviation of the polysulfides dissolution are the key issues for development of high-performance lithium-sulfur (Li-S) batteries. Here, we report self-assembly sandwiches composed of zeolitic-imidazolate-frameworks (ZIF-8)-derived mesoporous carbons (ZIF-8(C)) in between reduced graphene oxide (rGO) layers, which are filled with sulfurs inside and coated with poly(3, 4ethylenedioxythiophene) (PEDOT) outside (noted as P@rGO/ZIF-8(C)). During the synthesis process, the rGO layers stabilize the structure of ZIF-8 nanocrystals to obtain large specific surface area and high electric conductivity of mesoporous materials (rGO/ZIF-8(C)), ensuring accommodation of a large amount of sulfur and the efficient utilization of the confined sulfur. The mesoporous rGO/ZIF-8(C), PEDOT and N-doping provide physical absorption and chemical binding to the polysulfides during cycles. Consequently, the Li-S batteries with the composite cathodes exhibit the high capacity of 1308 mAh g(-1) and 865 mAh g(-1) at 0.2 C and 1 C, respectively, and a very low capacity fading of 0.03% per cycle after 500 reversible cycles at 1 C rate. The results indicate that the P@rGO/ZIF-8(C)-S composite cathode may offer a feasible strategy for construction of sulfur cathodes for high-performance Li-S batteries. (C) 2016 Elsevier B.V. All rights reserved.
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