期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 16, 页码 8272-8275出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00524h
关键词
-
资金
- National Natural Science Foundation of China NSFC [U1201241, 11375020, 51431001, 21321001]
The particle size of an electrode material is known to play an essential role in its electrochemical performance in Li-ion batteries. In Li-S batteries, porous host materials are applied to store sulfur and suppress the escape of polysulfides; yet the particle size of the host as an important parameter remains largely unexplored. Herein we chose ZIF-8, a metal-organic framework (MOF) proved promising for sulfur storage, as the proof-of-concept prototype, and systematically synthesized five sets of ZIF-8 samples of different particle sizes (from <20 nm to >1 mu m), using them as S@MOF cathodes. The results show that sulfur utilization increases monotonically with the decrease of ZIF-8 particle size (<20 nm: >950 mA h g(-1) at 0.5 C), while the best cycling stability (75% over 250 cycles at 0.5 C) is achieved with a moderate size (similar to 200 nm).
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