Journal
JOURNAL OF POWER SOURCES
Volume 356, Issue -, Pages 172-180Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.04.093
Keywords
Flexible; Free-standing; Titanium dioxide; Carbon nanofiber; Lithium-sulfur batteries
Funding
- National Key Research and Development Program of China [2016YFA0202601]
- National Science Fund for Distinguished Young Scholars of China [21225625]
- Natural Science Foundation of China [21576100]
- Nature Science Foundation of Guangdong [2014A030312007]
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Lithium-sulfur (Li-S) batteries are regarded as a promising next-generation electrical-energy-storage technology due to their low cost and high theoretical energy density. Furthermore, flexible and wearable electronics urgently requires their power sources to be mechanically robust and flexible. However, the effective progress of high-performance, flexible Li-S batteries is still hindered by the poor conductivity of sulfur cathodes and the dissolution of lithium polysulfides as well as the weak mechanical properties of sulfur cathodes. Herein, a new type of flexible porous carbon nanofiber film modified with graphene and ultrafine polar TiO2 nanoparticles is designed as a sulfur host, in which the artful structure enabled the highly efficient dispersion of sulfur for a high capacity and a strong confinement capability of lithium polysulfides, resulting in prolonged cycle life. Thus, the cathode shows an extremely high initial specific discharge capacity of 1501 mA h g(-1) at 0.1 C and an excellent rate capability of 668 mA h g(-1) at 5 C as well as prolonged cycling stability. The artful design provides a facile method to fabricate high-performance, flexible sulfur cathodes for Li-S batteries. (C) 2017 Elsevier B.V. All rights reserved.
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