Journal
JOURNAL OF POWER SOURCES
Volume 339, Issue -, Pages 20-26Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.11.038
Keywords
Lithium-sulfur battery; Polarity of polysulfide; Carbon nanotube-grafted-graphene; Electric conductivity; Rate performance; Cycleability
Funding
- National Natural Science Foundation of China [21476200, 21276229, 51271164]
- Fund from Science & Technology Ministry of Zhejiang province [2014C31003]
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A carbon nanotube-grafted-graphene (CNT-g-Gr) is developed for enhancements of electrical conduction and polysulfide (PS) absorption to improve rate performance and cycleability of lithium-sulfur battery. The CNT-g-Gr is prepared through CNT growth on Ni-deposited graphene sheet which is fabricated via pyrolysis of glucose in a molten salt. The obtained CNT-g-Gr shows much higher specific surface area and PS adsorption capability than graphene. The in-situ formed Ni nanoparticles on graphene sheet not only serve as the catalytic sites for CNT growth, but also function as the anchor-sites for polar PS absorption. The CNT-g-Gr contributes a superb PS adsorption capability arising from graphene and CNT absorbing weakly-polar PS species, and Ni nanoparticles absorbing the species with stronger polarity. The resultant Li-S battery with the CNT-g-Gr shows excellent cycleability and rate performance. A stable discharge capacity of 900 mAh g(-1) (with low capacity degradation rate) and a rate capacity of 260 mAh g(-1), at 30 degrees C discharge rate have been achieved. (C) 2016 Elsevier B.V. All rights reserved.
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