期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 826, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154197
关键词
Polyimide; Thermal-stable separator; MoO3; Li-S batteries
资金
- National Natural Science Foundation of China [21978258, 21776249, 21676248]
The shuttle effects of polysulfides and abominable safety problems restrict the practical application of lithium-sulfur batteries. Herein, we report a polyimide-based Janus separator by a simple filtration method introducing MoO3 nanoparticles and MWCNTs-COOH. Using this separator, the lithium-sulfur battery delivers a reversible capacity of 1274 mA h g(-1) at 0.2 C and a capacity 637 mA h g(-1) at 5 C. Moreover, the separator is flame-retardant and thermal-stable without obvious shrinkage even at 300 degrees C. Experimental observations reveal that uniformly dispersed MoO3 nanoparticles and MWCNTs-COOH as a pore structure regulator can obviously decrease the pore diameter and porosity of electrospun polyimide (PI) skeleton for intercepting polysulfides. The synergistic effect between MWCNTs-COOH, MoO3 and polyimide fibers enables the faster kinetics and more efficient conversion of polysulfides. (C) 2020 Elsevier B.V. All rights reserved.
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