Journal
ELECTROCHIMICA ACTA
Volume 168, Issue -, Pages 271-276Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.04.055
Keywords
Lithium-sulfur battery; Carbon nanofiber; Electrospinning; Cell configuration
Categories
Funding
- NSFC [51402236, 51472204, 51232005]
- Fundamental Research Funds for the Central Universities [3102014JCQ01020]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU) [83-TZ-2013]
- Guangdong Province Innovation RD Team Plan
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Lithium-sulfur (Li-S) battery with new configuration is demonstrated by inserting a flexible activated carbon nanofiber (ACNF) interlayer between the sulfur cathode and the separator. The ACNF with tunable pore structure is fabricated by a combination of electrospinning polyimide and a subsequent activation treatment. The influence of the textual characteristics of ACNFs on the electrochemical performance of Li-S batteries has been studied. The highly porous ACNF not only effectively intercepts/stabilizes the shuttling migration of polysulfides within the cathode region, but also provides reliable ionic/electronic conductivity for fast kinetics. The lightweight ACNF interlayer with higher specific surface area can yield enhanced cell performance at a low mass ratio of ACNF/sulfur (0.4). An initial specific capacity of 1224 mAh g(-1) along with high Coulombic efficiency, long cycling stability and good rate capability is achieved in the modified Li-S cell. (C) 2015 Elsevier Ltd. All rights reserved.
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