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The efficient redox electron transfer and powered polysulfide confinement of carbon doped tungsten nitride with multi-active sites towards high-performance lithium-polysulfide batteries
- Source :
- Applied Surface Science. 525:146625
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Functional oxide materials have been widely used as promising building blocks in lithium-sulfur/polysulfide batteries, however, their poor conductivity is an extreme challenge to further improve the device performance in practical applications. Herein, we develop a facile synthesis strategy to convert oxide into nitride materials - which represent high conductivity - by using nontoxic urea instead of hazard ammonia as nitric source. In particular, we have successfully synthesized carbon doped tungsten nitride (C-WN) materials through tungsten oxide, which introduces carbon-doping and lacunar surface to WN but with the conserved overall nanostructures of tungsten oxide. Their potential applications as the polysulfide host for lithium-polysulfide batteries are also investigated, as featured by the elevated electronic conductivity of WN materials with multi-active sites of tungsten, nitrogen and carbon. Attributable to the tailored material of synergetic effects, the enhanced electronic conductivity of the C-WN material not only accelerates the redox electrochemical reaction of polysulfides via the efficient redox electron transfer, but also reveals effectively immobilize polysulfides on the multi-active sites. As a result, C-WN-based lithium-polysulfide cell achieves initial 909 mAh/g at 3.2 mA/cm2, and retains 638 mAh/g after 500 cycles. This work offers a facile nitride synthesis strategy with carbon doping and rough surface, and further towards developing high efficiency lithium-polysulfide batteries and enlightening the material design in the energy storage technologies.
- Subjects :
- Materials science
Oxide
General Physics and Astronomy
chemistry.chemical_element
02 engineering and technology
Surfaces and Interfaces
General Chemistry
Nitride
Tungsten
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Redox
0104 chemical sciences
Surfaces, Coatings and Films
chemistry.chemical_compound
chemistry
Chemical engineering
Lithium
0210 nano-technology
Carbon
Polysulfide
Tungsten nitride
Subjects
Details
- ISSN :
- 01694332
- Volume :
- 525
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science
- Accession number :
- edsair.doi...........4b3007dfdc588bd7faab6a98bf0170f9