Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 10, Pages 8749-8757Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00190
Keywords
lithium-sulfur battery; porous carbon nanofibers; carbon nanotubes; free-standing film; high areal capacity
Funding
- New Energy Project for Electric Vehicles in National Key Research and Development Program [2016YFB0100200]
- NSFC of China [21573114, 51502145, 21421001]
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Low sulfur utilization and poor cycle life of the sulfur cathode with high sulfur loadings remain a great challenge for lithium-sulfur (Li-S) battery. Herein, the free-standing carbon film consisting of porous carbon nanofibers (PCNFs) and carbon nanotubes (CNTs) is successfully fabricated by the electrospinning technology. The PCNF/CNT film with three-dimensional and interconnected structure is promising for the uniformity of the high-loading sulfur, good penetration of the electrolyte, and reliable accommodation of volumetric expansion of the sulfur cathode. In addition, the abundant N/O-doped elements in PCNF/CNT film are helpful to chemically trap soluble polysulfides in the charge-discharge processes. Consequently, the obtained monolayer S/PCNF/CNT film as the cathode shows high specific capacity, excellent cycle stability, and rate stability with the sulfur loading of 3.9 mg cm(-2). Moreover, the high areal capacity of 13.5 mA h cm(-2) is obtained for the cathode by stacking three S/PCNF/CNT layers with the high sulfur loading of 12 mg cm(-2). The stacking-layered cathode with high sulfur loading provides excellent cycle stability, which is beneficial to fabricate high-energy-density Li-S battery in future.
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