多硫化物
分离器(采油)
材料科学
介孔材料
阴极
电化学
硫黄
化学工程
锂硫电池
阳极
电极
化学
电解质
催化作用
有机化学
冶金
工程类
物理化学
物理
热力学
作者
Rakesh Saroha,Jungwon Heo,Xueying Li,N. Angulakshmi,Younki Lee,Hyo-Jun Ahn,Jou-Hyeon Ahn,Do Kyung Kim
标识
DOI:10.1016/j.jallcom.2021.162272
摘要
In this study we report the use of a hybrid separator coated with mesoporous multi-walled carbon nanotubes (MWCNTs) and ferroelectric BaTiO3 (BTO) as a “conductive scaffold” and polysulfide barrier for high-performance lithium-sulfur batteries. The effectiveness of the hybrid separator was verified by using a high sulfur cathode (70%). The modified separator effectively limited the migration of lithium polysulfides, improved the integrity of the sulfur cathode, and provided a conductive channel for ion and electron transport. As a result, the cell utilizing the separator coated with MWCNT and BTO (AHT-MWCNT–BTO) exhibited excellent electrochemical performance and rate kinetics, delivering a high initial discharge capacity of 1388.6 mAh g−1 at 0.1 C-rate, corresponding to 83% sulfur utilization in the electrode. Additionally, the cycling performance revealed a 77% capacity retention of the initial value after 100 repeated cycles at 0.5 C-rate. Furthermore, even at a high current density of 2.0 C, the cell with the AHT-MWCNT–BTO-coated separator delivered a discharge capacity of 422.8 mAh g−1 after 350 cycles, besides significantly increasing the sulfur utilization and effectively improving the electrochemical conversion of trapped polysulfides. These results reveal the exceptional potential of AHT-MWCNT–BTO-coated separators in the development of next generation high-performance lithium–sulfur batteries.
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