Multifunctional Separator with Porous Carbon/Multi‐Walled Carbon Nanotube Coating for Advanced Lithium−Sulfur Batteries,ChemElectroChem

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Multifunctional Separator with Porous Carbon/Multi‐Walled Carbon Nanotube Coating for Advanced Lithium−Sulfur Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2017-11-06 , DOI: 10.1002/celc.201700986
Lei Tan ₁ , Xinhai Li ₁ , Zhixing Wang ₁ , Huajun Guo ₁ , Jiexi Wang ₁ , Liang An ₂

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An issue associated with lithium−sulfur (Li−S) batteries is polysulfide dissolution, leading to the serious crossover of polysulfide to the Li anode. To address this issue, we report on a multifunctional separator prepared by introducing a porous carbon/multi‐walled carbon nanotube (PC/MWCNT) composite into a commercial separator. It shows that the PC/MWCNT composite is able to enhance the interfacial interaction between the coating and the polysulfide and provides a large surface area for absorbing the polysulfide, thus improving the electrical conductivity. It has been demonstrated that the Li−S cell constructed with the PC/MWCNT composite separator results in a reversible capacity as high as 659 mAh g⁻¹ after 200 cycles at 0.5 C, and the average capacity fading rate of the cell is about 0.138 % per cycle. The performance improvement is attributed to a reduction in the crossover rate of polysulfide through the composite separator as a result of the polysulfide absorption by PC/MWCNT layer.

中文翻译：

具有多孔碳/多壁碳纳米管涂层的多功能隔板，用于高级锂硫电池

与锂硫（Li-S）电池相关的问题是多硫化物溶解，导致多硫化物严重跨入锂阳极。为了解决这个问题，我们报告了一种多功能隔板，该隔板是通过将多孔碳/多壁碳纳米管（PC / MWCNT）复合材料引入商用隔板中而制备的。结果表明，PC / MWCNT复合材料能够增强涂层与多硫化物之间的界面相互作用，并为吸收多硫化物提供了较大的表面积，从而提高了电导率。已经证明，用PC / MWCNT复合隔板构造的Li-S电池可逆容量高达659 mAh g ^-1在0.5 C下200个循环后，电池的平均容量衰减率约为每个循环0.138％。性能的提高归因于PC / MWCNT层吸收了多硫化物，从而降低了通过复合隔板的多硫化物的交叉速率。

更新日期：2017-11-06

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