Electrocatalytic activity of lithium polysulfides adsorbed into porous TiO 2 coated MWCNTs hybrid structure for lithium-sulfur batteries
作者： Xiulin He , Huijie Hou , Xiqing Yuan , Long Huang , Jingping Hu
DOI: 10.1038/SREP40679
关键词: Composite number 、 Dissolution 、 Polysulfide 、 Electrolyte 、 Conductivity 、 Lithium 、 Electrochemistry 、 Chemical engineering 、 Sulfur 、 Materials science
摘要: Lithium-sulfur batteries have attracted great attention because of their high energy density, environmental friendliness, natural abundance and intrinsically low cost sulfur. However, commercial applications are greatly hindered by rapid capacity decay due to poor conductivity electrode, fast dissolution the intermediate polysulfides into electrolyte, volume expansion Herein, we report a novel composite MWCNTs@TiO2-S nanostructure grafting TiO2 onto surface MWCNTs, followed incorporating sulfur composite. The inner MWCNTs improved mechanical strength electrode outer provided adsorption sites immobilize bonding interaction between polysulfides. with mass ratio 50% (MWCNTs in MWCNTs@TiO2) exhibited highest electrochemistry performance among all compositing ratios MWCNTs/TiO2. improvement might be attributed downward shift apparent Fermi level more positive potential electron rich space region at interface MWCNTs-TiO2 that facilitates reduction lithium polysulfide higher potential. Such hybrid structure can applicable for design other storage applications.
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