Journal
ELECTROCHIMICA ACTA
Volume 257, Issue -, Pages 210-216Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.10.069
Keywords
lithium-sulfur batteries; polysulfide trapping; separator; carbon coating
Categories
Funding
- National Natural Science Foundation of China and Guangdong Province [U1401246]
- Science and Technology Program of Guangdong Province of China [2014B010106005, 2015B010135011, 2015A050502047, 2016A020221031]
- Science and Technology Program of Guangzhou City of China [201508030018, 2016201604030040, 2017B0504004]
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Lithium-sulfur (Li-S) battery is considered as the next-generation of cost-efficient rechargeable battery systems to fulfill clean energy transportation systems due to its remarkable high theoretical energy density. Nevertheless, capacity fading and poor cycling stability mostly caused by polysulfide shuttle and active sulfur materials loss play an obstacle role on large-scale viable commercialization. In this paper, a flower-like hierarchical carbon sphere (FHCS) is prepared and coated on commercialized PP separator for polysulfide trapper. This carbon sphere with multi-scale pores strongly absorbs the polysulfide, further tremendously enhances the cycling performances, and the conducted carbon sphere also acts as current collector for improving the conductivity of active materials. The results show the cell demonstrates an initial discharge specific capacity of up to 1427 mAh g(-1) at 0.2C, and high reversible capacity of 730 mAh g(-1) with degradation rate of only 0.061% per cycle after 500 cycles at 0.5C. (C) 2017 Elsevier Ltd. All rights reserved.
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