材料科学
锂(药物)
锂硫电池
硫黄
化学工程
无机化学
电化学
化学
物理化学
电极
医学
工程类
内分泌学
冶金
作者
Yue Qiu,Lishuang Fan,Maoxu Wang,Xiaoju Yin,Xian Wu,Xun Sun,Da Tian,Bin Guan,Dongyan Tang,Naiqing Zhang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2020-10-20
卷期号:14 (11): 16105-16113
被引量:136
标识
DOI:10.1021/acsnano.0c08056
摘要
Precisely tuning the coordination environment of the metal center and further maximizing the activity of transition metal–nitrogen carbon (M-NC) catalysts for high-performance lithium–sulfur batteries are greatly desired. Herein, we construct an Fe-NC material with uniform and stable Fe-N2 coordination structure. The theoretical and experimental results indicate that the unsaturated Fe-N2 center can act as a multifunctional site for anchoring lithium polysulfides (LiPSs), accelerating the redox conversion of LiPSs and reducing the reaction energy barrier of Li2S decomposition. Consequently, the batteries based on a porous carbon nitride supported Fe-N2 site (Fe-N2/CN) host exhibit excellent cycling performance with a capacity decay of 0.011% per cycle at 2 C after 2000 cycles. This work deepens the understanding of the relationship between electronic structure of M-NC sites and the catalysis effect for the conversion of LiPSs. This strategy also provides a potent guidance for the further application of M-NC materials in advanced lithium–sulfur batteries.
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