多硫化物
锂(药物)
氧化还原
钨
材料科学
氧化物
氮化物
碳纤维
纳米技术
无机化学
化学工程
化学
冶金
电极
复合数
复合材料
电解质
物理化学
内分泌学
工程类
医学
图层(电子)
作者
Deqing He,Jianglu Xiang,Chenyang Zha,Rong Wu,Jun Deng,Yuwei Zhao,Hongguang Xie,You Liu,Pengcheng Wang,Wei Wang,Yao Yin,Tianshi Qin,Chao Zhu,Zhonghao Rao,Lin Wang,Wei Huang
标识
DOI:10.1016/j.apsusc.2020.146625
摘要
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.
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