多硫化物
法拉第效率
分离器(采油)
材料科学
微型多孔材料
电化学
化学工程
纳米结构
电解质
纳米技术
电极
导电体
化学
复合材料
工程类
物理
物理化学
热力学
作者
Xiao Kang,Iolanda Di Bernardo,Hailin Yang,Juan F. Torres,Lei Zhang
标识
DOI:10.1016/j.apsusc.2020.147680
摘要
The practical implementation of Li–S batteries is largely hindered by their low Coulombic efficiency (CE), rapid capacity decay, and poor rate capability, due to the poor electrical conductivity of sulfur and notorious “shuttle effect” of lithium polysulfides. Designing multifunctional separators is expected to increase the utilization of active materials and the electrochemical performance of Li–S batteries. Here, we synthesized a hybrid nanostructure with microporous ZIF-8 (dpore = 0.34 nm) microdomains embedded in chemically integrated 3D conductive hosts ([email protected]) via a facile hydrothermal approach as modified separators to enable long-life and high-rate Li–S batteries. Specifically, the [email protected] separator not only helps block, trap, and efficiently reutilize the polysulfides, but also provides channels allowing smooth Li-ion (d = 0.152 nm) transfer. Results indicate that the [email protected] separator, compared with the bare PP one, exhibits significant improvements in suppressing the polysulfide shuttling. Galvanostatic cycling using the [email protected] separator shows a high capacity of 992.2 mAh g−1 at 1 C rate for 200 cycles and 587.9 mAh g−1 at 3 C rate for 800 cycles with CE of 96.7%. Notably, the cells with the [email protected] separator also overperform those with the pristine separators at higher rates.
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