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Discharging a Li-S battery with ultra-high sulphur content cathode using a redox mediator

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Title
Discharging a Li-S battery with ultra-high sulphur content cathode using a redox mediator
Author(s)
Kwi Ryong Kim; Kug-Seung Lee; Chi-Yeong Ahn; Seung-Ho Yu; Yung-Eun Sung
Publication Date
2016-08
Journal
SCIENTIFIC REPORTS, v.6, no., pp.32433 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Lithium-sulphur batteries are under intense research due to the high specific capacity and low cost. However, several problems limit their commercialization. One of them is the insulating nature of sulphur, which necessitates a large amount of conductive agent and binder in the cathode, reducing the effective sulphur load as well as the energy density. Here we introduce a redox mediator, cobaltocene, which acts as an electron transfer agent between the conductive surface and the polysulphides in the electrolyte. We confirmed that cobaltocene could effectively convert polysulphides to Li 2 S using scanning electron microscope, X-ray absorption near-edge structure and in-situ X-ray diffraction studies. This redox mediator enabled excellent electrochemical performance in a cathode with ultra-high sulphur content (80 wt%). It delivered 400 mAh g -1 cathode capacity after 50 cycles, which is equivalent to 800 mAh g -1 S in a typical cathode with 50 wt% sulphur. Furthermore, the volumetric capacity was also dramatically improved. © The Author(s) 2016
URI
http://pr.ibs.re.kr/handle/8788114/3140
DOI
10.1038/srep32433
ISSN
2045-2322
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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