期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 559, 期 -, 页码 244-253出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.10.027
关键词
Lithium-sulfur batteries; Carbon nanotubes; Porous carbons; Nitrogen-doped carbons; Shuttle effect
资金
- National Natural Science Foundation of China [21401145, 11474226, 51676143]
- Fundamental Research Funds for the Central Universities [WUT: 2019-IB-003, 2018-IB-022, 2018-IB-028, 2017-IB-003]
- self-determined and innovative research funds of WUT [2019 -HS -B1-08, 2019 -HS -B1-11]
Lithium-sulfur batteries hold broad prospects as the low-cost and high-energy storage system. However, the practical application is limited by the intrinsic insulating nature of sulfur and severe shuttle effect of soluble polysulfide intermediates. Herein, we demonstrate a convenient self-assembly strategy for encapsulating carbon nanotubes in nitrogen-doped hollow carbon shells, to construct a nitrogen-doped tube-in-tube carbon nanostructure (NTTC) as a host material of sulfur. In this peculiar structure, the highly conductive carbon nanotube cores facilitate the electron transfer while the hollow porous structure is capable of accommodating high sulfur content of 70 wt% in the composites. Moreover, the nitrogen doping helps to alleviate the shuttle effect owing to enhanced chemisorption towards polysulfides. Benefiting from these merits, the NTTC/S composite with the high areal mass loading of similar to 2.5 mg cm(-2) presents a high reversible capacity (1346.9 mAh g(-1), at 0.05 C) and excellent rate capability (533.5 mAh g(-1) at 3C). More impressively, NTTC/S electrode exhibits good cycling stability at a high rate of 2 C corresponding to slight capacity decay of 0.055% per cycle over 500 discharge/charge cycles. (C) 2019 Elsevier Inc. All rights reserved.
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