期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802130
关键词
excellent cycling performance; lithium dendrites; MOF-based membranes; polysulfides shuttle; pouch cells
类别
资金
- National Basic Research Program of China [2014CB932300]
- NSF of China [21633003, 21373111]
- China Scholarship Council
Lithium-sulfur (Li-S) batteries are considered a promising candidate for next-generation energy storage devices due to their ultrahigh theoretical energy density (approximate to 2600 Wh kg(-1)). However, the uncontrolled growth of Li dendrites and the adverse effect of polysulfide shuttling seriously hinder their practical applications. Herein, a metal organic framework based membrane (MOF@ PVDF-HFP) with good flexibility is designed and fabricated by a facial vacuum filtration strategy. The highly uniform pore sizes of MOF particles facilitate homogenous Li-ion fluxes, fundamentally inhibiting the growth of Li dendrites and resulting in stable Li plating/striping even at a quite high current density (10 mA cm(-2)). In addition, owing to the narrow pore size window of MOF nanoparticles, the MOF@ PVDF-HFP membrane serves as an effective barrier for suppressing the polysulfide shuttle, realizing an ultralong cycle life Li-S coin cell with an ultralow capacity fading upon 2000 cycles (0.015% per cycle). Moreover, high specific capacity (1269 mA h g(-1)) and excellent capacity retention (936 mA h g(-1) after 200 cycles) of a flexible Li-S pouch cell with a high sulfur loading (5.8 mg cm(-2)) demonstrate the potential of MOF@ PVDF-HFP membranes for the development of practical energy storage devices.
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