电化学
材料科学
石墨烯
阳极
阴极
锂(药物)
钼
分离器(采油)
离子
化学工程
无机化学
纳米技术
电极
化学物理
化学
物理化学
有机化学
内分泌学
工程类
冶金
物理
热力学
医学
作者
Jia Yuan,Baojuan Xi,Wei Wang,Zhengchunyu Zhang,Ning Song,Xuguang An,Jie Liu,Jinkui Feng,Shenglin Xiong
出处
期刊:Small
[Wiley]
日期:2022-08-18
卷期号:18 (37)
被引量:30
标识
DOI:10.1002/smll.202203947
摘要
The improvement of lithium-sulfur batteries is still impeded by notorious shuttling effect and sluggish kinetics on the S cathode, and rampant Li dendrite formation on the Li anode makes it worse. Herein, a type of single-atom dispersed Mo on nitrogen-doped graphene (Mo/NG) with a distinctive Mo-N2 O2 -C coordination structure first serving as a multifunctional material is designed by a structure-oriented strategy to solve Li and S electrochemistry. Mo/NG with superior intrinsic properties endowed by the unique coordination configuration adsorbs soluble polysulfides and promotes bidirectional conversion of LiPSs at the cathode side. Meanwhile, the suitable binding strength of Mo/NG with lithium ions endows it with an attractive lithiophilic feature. Specifically, Mo/NG is able to work as the adaptor to redistribute lithium ions on the interface of separator and homogenize the lithium ion flux. Due to the suitable binding ability with Li+ , it does not interfere with the diffusion of lithium ions across and provides tunnels exclusive to lithium ions to generate fast and homogeneous flux. Ascribed to such unique multifunctionality, Li-S batteries assembled with Mo/NG exhibit excellent electrochemical performance including long cycling stability over 1000 cycles and high areal capacities under high sulfur mass loading.
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