Journal
NANO ENERGY
Volume 42, Issue -, Pages 205-214Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.10.053
Keywords
Single-wall; Carbon nanotube; Lithium sulfur; Batteries; High energy
Categories
Funding
- MOST [2016YFA0200100, 2016YFB0100100, 2014CB932402]
- National Science Foundation of China [51525206, 51521091, 51372253, U1401243]
- Chinese Academy of Sciences [XDA09010104, KGZD-EWT06]
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Lithium-sulfur (Li-S) batteries are among the most promising candidates for the next-generation energy storage systems. However, challenges regarding the limited sulfur content and areal sulfur loading in the cathode lead to a low areal capacity that cannot even outperform state-of-the-art lithium-ion batteries, which greatly offsets the high-energy advantage of Li-S batteries and further hinders their practical use. Here, we theoretically indicated that the electronic conduction efficiency of the sulfur host nanomaterial plays a crucial role in determining the sulfur content, and a highly efficient single-wall carbon nanotube (SWCNT) conductive network was constructed for our proof-of-concept studies, resulting in an unprecedentedly high sulfur content up to 95 wt%. The interwoven SWCNTs not only provide abundant paths for electron and lithium ion transport, but also facilitate polysulfides trapping during sulfur conversion reactions. As a result, a high areal capacity of 8.63 mA h cm(-2) was obtained with a high areal sulfur loading of 7.2 mg cm(-2), much higher than that of lithium-ion batteries (4 mA h cm(-2)). Our approach demonstrates a new design concept for the electrode materials of high-energy-density lithium-sulfur batteries and could possibly be extended to other electrochemical energy storage systems.
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