Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 14, Pages 12436-12444Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b00389
Keywords
lithium-sulfur battery; microporous carbon polyhedrons; polyacrylonitrile; electrospinning; SEI layer
Funding
- 973 Program [2015CB251100]
- NSFC of China [21573114, 51502145, 21421001]
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Microporous carbon polyhedrons (MCPs) are encapsulated into polyacrylonitrile (PAN) nanofibers by electrospinning the mixture of MCPs and PAN. Subsequently, the as prepared MCPs-PAN nanofibers are employed as sulfur immobilizer for lithium-sulfur battery. Here, the S/MCPs-PAN multi composites integrate the advantage of sulfur/microporous carbon and sulfurized PAN. Specifically, with large pore volume, MCPs inside PAN nanofibers provide a sufficient sulfur loading. While PAN-based nanofibers offer a conductive path and matrix. Therefore, the electrochemical performance is significantly improved for the S/MCPs-PAN multicomposite with a suitable sulfur content in carbonate-based electrolyte. At the current density of 160 mA g(sulfur)(-1), the S/MPCPs-PAN composite delivers a large discharge capacity of 789.7 mAh g(composite)(-1), high Coulombic efficiency of about 100% except in the first cycle, and good capacity retention after 200 cycles. In particular, even at 4 C rate, the S/MCPs-PAN composite can still release the discharge capacity of 370 mAh g(composite)(-1). On the contrary, the formation of the thick SEI layer on the surface of nanofibers with a high sulfur content are observed, which is responsible for the quick capacity deterioration of the sulfur-based composite in carbonate based electrolyte. This design of the S/MCPs-PAN multicomposite is helpful for the fabrication of stable Li-S battery.
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