Crosslinked Polypyrrole Grafted Reduced Graphene Oxide-Sulfur Nanocomposite Cathode for High Performance Li-S Battery. (1st May 2017)

• Record Type: Journal Article
• Authors: Qian, Weiwei; Gao, Qiuming; Zhang, Hang; Tian, Weiqian; Li, Zeyu; Tan, Yanli
• Is Part Of: Electrochimica acta. Volume 235(2017)
• Page Start: 32
• Page End: 41
• Publication Date: 2017-05-01
• Subjects: ternary nanocomposite -- polypyrrole -- reduced graphene oxide -- one-pot synthesis -- lithium sulphur battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.03.063
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: 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 CS, SC = S and SO 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.