Journal
SCIENCE ADVANCES
Volume 4, Issue 6, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aat1687
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Funding
- Office of Naval Research Global (US) through the Naval Research Grant [N62909-17-1-2162, M4062262]
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As a special class of cathode materials for lithium-sulfur batteries, pyrolyzed polyacrylonitrile/sulfur (pPAN/S) can completely solve the polysulfide dissolution problem and deliver reliable performance. However, the applicable S contents of pPAN/S are usually lower than 50 weight % (wt %), and their capacity utilizations are not sufficient, both of which greatly limit their energy densities for commercial applications. We report a pyrolyzed polyacrylonitrile/selenium disulfide (pPAN/SeS2) composite with dramatically enhanced active material content (63 wt %) and superior performances for both lithium and sodium storage. As a result, pPAN/SeS2 delivers high capacity of >1100 mAh g(-1) at 0.2 A g(-1) for Li storage with extremely stable cycle life over 2000 cycles at 4.0 A g(-1). Moreover, when applied in a room temperature Na-SeS2 battery, pPAN/SeS2 achieves superior capacity of >900 mAh g(-1) at 0.1 A g(-1) and delivers prolonged cycle life over 400 cycles at 1.0 A g(-1).
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