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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Modified Separator Based on mesoporous carbon/TiO2 composites as Advanced Polysulfide Adsorber for High Electrochemical Performance Li-S Batteries
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Modified Separator Based on mesoporous carbon/TiO2 composites as Advanced Polysulfide Adsorber for High Electrochemical Performance Li-S Batteries

机译：基于中孔碳/ TiO2复合材料的改性分离器作为高电化学性能Li-S电池的高级多硫化物吸附器

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摘要

Lithium-sulfur batteries have been drawn much attention for the researchers due to their high energy density low cost, and environmental friendliness. However, the severe polysulfide dissolution and poor electronic conductivity limit the actual electrochemical performance. Separator modification is considered as a promising method to enhance the electrochemical performance of lithium-sulfur batteries. Herein, we develop mesoporous carbon/TiO2 (MC/TO) composites as the modifying materials on the surface of the pure separator. The polar metal oxide TiO2 on the modified separator could adsorb the polysulfide while the mesoporous graphitic carbon could improve the electronic conductivity at the same time. Owing to the above merits, the lithium-sulfur batteries with MC/TO modified separator display excellent electrochemical performance with a capacity of 658 mAh g(-1) at 2 C over 500 electrochemical cycles. This work provides a promising strategy to design modified separator which could inhibit the polysulfide dissolution and accelerate the sulfur redox kinetics, therefore obtaining high electrochemical performance Li-S batteries. (C) 2021 Elsevier B.V. All rights reserved.
机译：锂硫电池以其高能量密度、低成本、环保等优点受到研究人员的广泛关注。然而，严重的多硫化物溶解和较差的电子导电性限制了实际的电化学性能。隔膜改性被认为是提高锂硫电池电化学性能的一种很有前途的方法。在此，我们开发了介孔碳/TiO2（MC/TO）复合材料作为纯分离器表面的改性材料。改性分离器上的极性金属氧化物TiO2可以吸附多硫化物，而介孔石墨碳可以提高电子导电性。由于上述优点，采用MC/to改性隔膜的锂硫电池在2℃下的500次电化学循环中显示出优异的电化学性能，容量为658 mAh g（-1）。这项工作为设计能够抑制多硫化物溶解、加速硫氧化还原动力学、从而获得高电化学性能锂硫电池的改性隔膜提供了一种有前途的策略。（c）2021爱思唯尔B.V.保留所有权利。

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