期刊
NANO RESEARCH
卷 11, 期 12, 页码 6436-6446出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-2168-8
关键词
lithium-sulfur batteries; composite spongy framework; polysulfide reservoir layer; chemisorption and absorbability; electrocatalytic effect
类别
资金
- National Key R&D Program of China [2017YFA0208200, 2016YFB0700600, 2015CB659300]
- National Natural Science Foundation of China [21403105, 21573108, 51761135104]
- Natural Science Foundation of Jiangsu Province [BK20150583, BK20170644]
- Fundamental Research Funds for the Central Universities [020514380107]
In the development of lithium-sulfur (Li-S) batteries, various approaches have been adopted to enhance the electronic conductivity of the sulfur cathode and alleviate the shuttle effect of polysulfides; however, the strategies providing efficient solutions are still limited. To further improve the electrochemical performance of Li-S batteries, in this work we propose a new strategy involving the incorporation of a three-dimensional functional spongy framework as polysulfide reservoir layer, with strong absorbability and electrocatalytic activity towards sulfur species. The spongy framework has a hierarchical architecture composed of highly conductive Ni foam/graphene/carbon nanotubes/MnO2 nanoflakes (NGCM). The strongly interconnected Ni foam, graphene, and carbon nanotubes of the NGCM sponge facilitate electron transfer during discharge/charge processes; moreover, the superlyophilic properties of the NGCM sponge ensure good wettability and interface contact with the Li-S electrolyte, and the porous MnO2 nanoflakes provide strong chemisorptive and electrocatalytic effects on polysulfides (as confirmed theoretically and experimentally). The NGCM sponge, serving as a polysulfide reservoir layer attached on a conventional sulfur-mixed carbon nanotubes (S/CNTs) cathode, can provide improved reversible capacity, rate capability (593 mAh.g(-1) at 3.0 degrees C), and cycling stability. In addition, the self-discharge rate is greatly reduced, owing to the efficient conservation of polysulfides in the NGCM spongy framework.
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