多硫化物
法拉第效率
材料科学
化学工程
硫黄
电解质
电化学
分离器(采油)
熔盐
碳纤维
吸附
复合数
锂(药物)
锂硫电池
石墨烯
无机化学
纳米技术
复合材料
化学
电极
冶金
有机化学
医学
物理
物理化学
工程类
内分泌学
热力学
作者
Peilong Zhou,Xinwei Geng,Dongxu Yao,Yongfeng Xia,Yu‐Ping Zeng
标识
DOI:10.1002/ente.202300736
摘要
Traditional carbon materials suffer from weak adsorption of lithium polysulfides and excessive consumption of electrolyte. A simple and feasible molten salt method is applied for constructing an active nanocrystalline TiC shell on the surface of porous carbon. The highly active TiC nanoshells endow the core–shell composite with efficient chemical–physical synergistic adsorption, which can effectively confine and convert polysulfides, thereby improving the electrochemical performance of lithium–sulfur batteries. The lithium–sulfur batteries assembled with modified separator deliver a high initial discharge specific capacity of 1396 mAh g −1 at a discharge rate of 0.5 C and a high capacity retention of 747.1 mAh g −1 after 500 cycles, with a high coulombic efficiency of 98% during cycling. Besides, this molten salt method can be applied to modify the porous carbon materials of various composite sulfur cathodes such as graphene, carbon nanotubes, and 3D nonwoven carbon fabrics.
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