The impact of the particle size of a metal-organic framework for sulfur storage in Li-S batteries
The impact of the particle size of a metal-organic framework for sulfur storage in Li-S batteries
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金属有机骨架颗粒尺寸对锂硫电池硫储存的影响
DOI：
10.1039/c5ta00524h
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发表时间：
2015
影响因子：
11.9
通讯作者：
Li Xingguo
中科院分区：
文献类型：
--
作者：
Zhou Junwen;Yu Xiaosong;Fan Xinxin;Wang Xiaojuan;Li Haiwei;Zhang Yuanyuan;Li Wei;Zheng Jie;Wang Bo;Li Xingguo
在锂离子电池中，电极材料的粒径对其电化学性能起着至关重要的作用。在锂硫电池中，多孔主体材料用于储存硫和抑制多硫化物的逸出；然而，寄主的颗粒大小作为一个重要参数在很大程度上仍未被探索。本文选择具有硫存储潜力的金属有机骨架（MOF） ZIF-8作为概念验证原型，系统地合成了5组不同粒径（<20 nm至>.1 μm）的ZIF-8样品，并将其用作S@MOF阴极。结果表明，硫的利用率随着ZIF-8粒径的减小（<20 nm: 0.5 C时>950 mA h g−1）而单调增加，而中等粒径（~ 200 nm）的ZIF-8在0.5 C时达到最佳的循环稳定性（250次循环75%）。
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 μm), 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 (∼200 nm).