Polyoxometalates/Active Carbon Thin Separator for Improving Cycle Performance of Lithium–Sulfur Batteries
Polyoxometalates/Active Carbon Thin Separator for Improving Cycle Performance of Lithium–Sulfur Batteries
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用于提高锂硫电池循环性能的多金属氧酸盐/活性炭薄隔膜
DOI：
10.1021/acsami.8b11227
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发表时间：
2018
影响因子：
9.5
通讯作者：
Zhongmin Su
中科院分区：
文献类型：
--
作者：
Wei Yao;Li Liu;Xuesong Wu;Chao Qin;Haiming Xie;Zhongmin Su
锂硫（li -硫）电池由于其较高的理论能量密度，在下一代储能设备中具有巨大的潜力。然而，多硫化物的穿梭效应严重降低了循环稳定性和容量，阻碍了其商业应用。本研究利用聚阴离子与多硫化物之间的库仑斥力，设计并制备了一种双功能复合隔膜，包括聚丙烯（PP）基体层和Keggin聚金属氧酸盐[PW12O40]3 - /超级P复合缓凝层。这种二元复合分离器在提高库仑效率和循环稳定性方面表现出明显的效果。与聚丙烯（PP）基体分离器相比，使用PW12/Super P分离器，经过120次循环后，容量提高了41%。这是首次将聚金属氧酸盐（POM）作为锂硫电池的双功能隔膜，证明了POM基隔膜在降低锂硫电池穿梭效应方面的前景。
Lithium–sulfur (Li–S) batteries have great potential for the next generation of energy-storage devices owing to their high theoretical energy density. However, the polysulfides’ shuttling effect seriously degraded the cycle stability and capacity and hindered their commercial applications. Here, we design and fabricate a bifunctional composite separator including a polypropylene (PP) matrix layer and Keggin polyoxometalate [PW12O40]3–/Super P composite retarding layer by utilizing the Coulombic repulsion between polyanion and polysulfides. Such a binary composite separator shows the effects in enhancing the Coulombic efficiency and cycling stability. Compared with the polypropylene (PP) matrix separator, the capacity is improved by 41% after 120 cycles when using the PW12/Super P separator. It is the first time that the polyoxometalate (POM) matrix is used as a bifunctional separator for lithium–sulfur batteries, demonstrating the promise of POM-based separators in reducing the shuttling effect of Li–S battery.