Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 6, Pages 7545-7557Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b00273
Keywords
Heteroatom-doping; Separator modification; Carbon nanotubes; Sulfur host; Lithium-sulfur batteries
Categories
Funding
- National Natural Science Foundation of China [51272221]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2017B292]
- Key Project of Strategic New Industry of Hunan Province [2016GK4005, 2016GK4030]
Ask authors/readers for more resources
In order to restrict the polysulfide shuttle effect and enhance sulfur utilization of lithium-sulfur batteries (LSBs) especially at low charge/discharge rates, a facile hydrothermal synthesis and subsequent heating melting treatment are used to synthesize the heteroatom-doped carbon nanotubes/sulfur composite cathode. The composition analysis and structure characteristics of samples are examined by X-ray photoelectron spectroscopy, X-ray powder diffraction, and transmission electron microscopy. The electrochemical performances of samples are measured by cyclic voltammetry and charge/discharge experiments. The results show that N, B, S tridoped active carbon nanotubes (ACNTs) with abundant mesoporous structure enable fast Li+ transmittal and provide strong polysulfide adsorption ability. More importantly, they offer enough mechanical strength to support high sulfur loading (77 wt %) that maximizes their chemical role and can accommodate large volume changes. The N, B, S tridoped ACNTs/S composite exhibits a superb incipient capacity of 1166 mAh/g-S at 0.3 C and large reversible capacity of 881 mAh/g-S at the 700th cycle. To further promote the cyclic lifespan of LSB, the as-prepared N, B, S tridoped ACNTs acted as both sulfur matrix and spring functional layer and achieved a large reversible specific capacity of about 713 mAh/g-S at the 1400th cycle at lofty current density of 0.5 C with a slow capacity decay of 0.014% 1/cycle and a higher sulfur loading of 90 wt %. Accordingly, reasonable design for the heteroatom doping element in carbon material and separator modification will be distinctly vital for enhancing the electrochemical performance of the LSB and boosting its industrial application.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available