Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 18, Pages 9438-9445Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00343a
Keywords
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Funding
- Sofja Kovalevskaja award of the Alexander von Humboldt Foundation
- National Natural Science Foundation of China [21171015, 21373195]
- Recruitment Program of Global Experts
- program for New Century Excellent Talents in University (NCET)
- Fundamental Research Funds for the Central Universities [WK2060140014, WK2060140016]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
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Sulfur shows a large lithium-storage capacity and this make it an attractive cathode candidate for next-generation flexible lithium-ion batteries. However, the insulating nature of sulfur and the dissolution of intermediate polysulfides limit the rate performances and cycle life of Li-sulfur batteries. Here, we report a class of freestanding cathode films consisting of hierarchically porous carbon-encapsulated sulfur have high rate capability (a reversible capacity of 1017 mA h g(-1), 865 mA h g(-1), and 726 mA h g(-1) at 0.2 C, 0.5 C and 1 C, respectively) as well as excellent cycle stability (approximate 10.5% capacity loss after 300 cycles). In addition, the free-standing cathode films have good mechanical flexibility, and thus show remarkable lithium-storage performances at the bent state. The results indicate that such free-standing cathode films with 3D hierarchical structure will provide new opportunities for Li-sulfur batteries for applications in flexible electronic devices.
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