The efficient redox electron transfer and powered polysulfide confinement of carbon doped tungsten nitride with multi-active sites towards high-performance lithium-polysulfide batteries
| Autor: | Zhonghao Rao, Hongguang Xie, Tianshi Qin, Wei Wang, Yuwei Zhao, Wei Huang, Deqing He, Jianglu Xiang, Rong Wu, Pengcheng Wang, You Liu, Chao Zhu, Chenyang Zha, Yao Yin, Lin Wang, Jun Deng |
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| Rok vydání: | 2020 |
| Předmět: |
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 |
| Zdroj: | Applied Surface Science. 525:146625 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2020.146625 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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