Effect of carbon-sulphur bond in a sulphur/dehydrogenated polyacrylonitrile/reduced graphene oxide composite cathode for lithium-sulphur batteries
- Authors
- Konarov, Aishuak; Bakenov, Zhumabay; Yashiro, Hitoshi; Sun, Yang-Kook; Myung, Seung-Taek
- Issue Date
- Jul-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Sulphur; Reduced graphene oxide; Dehydrogenated polyacrylonitrile; Cathode; Lithium; Battery
- Citation
- JOURNAL OF POWER SOURCES, v.355, pp.140 - 146
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 355
- Start Page
- 140
- End Page
- 146
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/4775
- DOI
- 10.1016/j.jpowsour.2017.04.063
- ISSN
- 0378-7753
- Abstract
- A S/DPAN (dehydrogenated polyacrylonitrile) composite shows promising electrode performances as a cathode material for Li-S batteries though its electric conductivity is insufficient for high rate tests. In an attempt to enhance the electric conductivity, the S/DPAN composite is attached on reduced graphene oxide (rGO) sheets via self-assembling modification. As a result, the conductivity improves to ∼10−4 S cm−1, and the S/DPAN/rGO composite thereby delivers approximately 90% of the theoretical capacity of sulphur at a rate of 0.2C (0.34 A g−1) over 700 mAh (g-S)−1 even at 2C (3.4 A g−1). We first report on the Csingle bondS bond between sulphur and DPAN in a composite that maintains the bond even after an extensive cycling test, as confirmed by time-of-flight secondary-ion mass spectroscopy (ToF-SIMS). These synergistic effects enable facile electron transport such that the S/DPAN/rGO composite electrode is able to maintain superior electrode performances.
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