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Binding mechanism of sulfur and dehydrogenated polyacrylonitrile in sulfur/polymer composite cathode
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Doan, The Nam Long, Ghaznavi, Mahmoudreza, Zhao, Yan, Zhang, Yongguang, Konarov, Aishuak, Sadhu, Mikhail, Tangirala, Ravichandra and Chen, P. (2013) Binding mechanism of sulfur and dehydrogenated polyacrylonitrile in sulfur/polymer composite cathode. Journal of Power Sources, Volume 241 . pp. 61-69. doi:10.1016/j.jpowsour.2013.04.113 ISSN 0378-7753.
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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2013.04.113
Abstract
A composite consisting of sulfur/dehydrogenated polyacrylonitrile is one of the most promising cathode materials for use in rechargeable lithium–sulfur batteries. However, the reported sulfur contents have been low, less than 50 wt%, which compromise the intrinsic high specific capacity and energy of elemental sulfur and hence decrease significantly the specific energy of the composite. To identify the potential to further increase the sulfur content, we elucidate the binding mechanism of sulfur and polyacrylonitrile in their composite. The heat treatment experiments at varying timespans with excess sulfur showed a constancy of sulfur content after a critical length of timespan, indicating the saturation of sulfur in the structure of dehydrogenated polyacrylonitrile. Based on molecular structure and size consideration, it is proposed that the binding involves the formation of an 8 membered ring of sulfur embedded between 4 heterocyclic rings of dehydrogenated polyacrylonitrile. From this model and experimental results, we show that there exists an upper limit of sulfur content in the sulfur/dehydrogenated polyacrylonitrile composite at 56 wt%.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Journal or Publication Title: | Journal of Power Sources | ||||
Publisher: | Elsevier S.A. | ||||
ISSN: | 0378-7753 | ||||
Official Date: | 1 November 2013 | ||||
Dates: |
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Volume: | Volume 241 | ||||
Page Range: | pp. 61-69 | ||||
DOI: | 10.1016/j.jpowsour.2013.04.113 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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