A LiAlO(2)/nitrogen-doped hollow carbon spheres (NdHCSs) modified separator for advanced lithium-sulfur batteries.
A LiAlO(2)/nitrogen-doped hollow carbon spheres (NdHCSs) modified separator for advanced lithium-sulfur batteries.
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用于先进锂硫电池的LiAlO2/氮掺杂空心碳球（NdHCSs）改性隔膜
DOI：
10.1039/c7ra10367k
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发表时间：
2018-01-02
期刊：
影响因子：
3.9
通讯作者：
Lai, Yanqing
中科院分区：
文献类型：
--
作者：
Li, Fanqun;Qin, Furong;Wang, Guanchao;Zhang, Kai;Wang, Peng;Zhang, Zhian;Lai, Yanqing
锂硫（Li-S）电池由于其不稳定的理论比容量和能量密度而受到极大关注。然而，它们的实际商业化仍然面临着许多棘手的问题，其中最困难的是溶解多硫化物的穿梭效应。为了限制多硫化物的穿梭，本文设计了一种新型双层铝酸锂/掺氮空心碳球（LiAlO 2/NdHCS）改性隔板。在隔板上的上NdHCSs层充当物理和化学吸附多硫化物的第一屏障，而底部LiAlO 2层充当物理阻挡多硫化物的第二屏障，而由于LiAlO 2的高离子电导率而不限制Li+传输。具有LiAlO 2/NdHCS改性隔膜的电池在0.2C下显示出1500 mA h g−1的初始放电容量，并且在2C下500次循环后获得543.3 mA h g−1的放电容量。特别地，当活性材料的面密度增加到4.5mg cm-2时，电池在0.5C下100次循环后保持538.6mA h g-1的放电容量。LiAlO_2/NdHCS_3改性隔膜制备的锂硫电池具有优异的电化学性能，为锂硫电池的应用开辟了一条新的途径。LiAlO 2/掺氮空心碳球（NdHCSs）改性隔膜限制了多硫化物的穿梭。
Lithium–sulfur (Li–S) batteries have gained significant attention due to their ultrahigh theoretical specific capacity and energy density. However, their practical commercialization is still facing many intractable problems, of which the most difficult is the shuttle effect of dissolved polysulfides. To restrict the shuttle of polysulfides, herein, a novel double-layer lithium aluminate/nitrogen-doped hollow carbon sphere (LiAlO2/NdHCSs)-modified separator was designed. The upper NdHCSs layer on the separator works as the first barrier to physically and chemically adsorb polysulfides, whereas the bottom LiAlO2 layer acts as the second barrier to physically block the polysulfides without restricting the Li+ transport due to the high ionic conductivity of LiAlO2. Cells with the LiAlO2/NdHCSs-modified separator showed an initial discharge capacity of 1500 mA h g−1 at 0.2C, and a discharge capacity of 543.3 mA h g−1 was obtained after 500 cycles at 2C. Especially, when the areal density of the active material was increased to 4.5 mg cm−2, the cells retained a discharge capacity of 538.6 mA h g−1 after 100 cycles at 0.5C. The outstanding electrochemical performance of Li–S cells with the LiAlO2/NdHCSs-modified separators show a new approach for the applications of Li–S batteries. LiAlO2/nitrogen-doped hollow carbon spheres (NdHCSs)-modified separators restrict the shuttle of the polysulfides.
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影响因子：
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