期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 6, 页码 7545-7557出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b00273
关键词
Heteroatom-doping; Separator modification; Carbon nanotubes; Sulfur host; Lithium-sulfur batteries
资金
- 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]
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.
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