Journal
ELECTROCHIMICA ACTA
Volume 235, Issue -, Pages 32-41Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.03.063
Keywords
ternary nanocomposite; polypyrrole; reduced graphene oxide; one-pot synthesis; lithium sulphur battery
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Funding
- National Basic Research Programs of China (973 Program) [2014CB931800]
- Chinese National Science Foundation [21571010, U0734002]
- Chinese Aeronautic Project [2013ZF51069]
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A novel ternary rGO/PPy/S nanocomposite possessing of a hierarchical nanostructure via incorporating the matrix of reduced graphene oxide (rGO) coated by polypyrrole (PPy) with sulphur was prepared by a facile one-pot in situ method. The chemical bonds exist between PPy and rGO through the formation of graphitic N and pyridine oxide N, and the C-S, S-C = S and S-O chemical bonds form between rGO/PPy and S in the structure of the rGO/PPy/S material. The loading content of sulphur is 69.43 wt.% for the rGO/PPy/S sample. The rGO/PPy/S material exhibits a high performance when used as the cathode of Li-S battery. The initial and last discharge capacity arrived at 991.5 and 626.7 mAh g (1) at 1C with 400 cycles which is corresponding to the capacity retention ratio of 63.2%, indicating its very high cyclic stability. The discharge capacity of 537.4 mAh g (1) could be obtained at 5C and it maintained at 442.1 mAh g (1) after 400 cycles with the Coulombic efficiency of more than 90%, showing its excellent rate stability. (C) 2017 Elsevier Ltd. All rights reserved.
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