A three-dimensional interconnected nitrogen-doped graphene-like porous carbon-modified separator for high-performance Li–S batteries

Literature Information

Publication Date 2020-06-09
DOI 10.1039/D0SE00620C
Impact Factor 6.367
Authors

Wen Huang, Daqian Ruan, Hui Chen, Kai Hu, Juan Wen, Wenqi Yan, Yusong Zhu, Yi Zhang, Nengfei Yu


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Abstract

Suppressing rapid capacity decay caused by the shuttle effect of dissolved lithium polysulfides between two electrodes is crucial to the realization of a practical lithium–sulfur (Li–S) batteries. Herein, the shuttle effect of polysulfides was efficiently inhibited by using a lightweight and thin functional separator in the form of coating three-dimensional interconnected nitrogen-doped graphene-like porous carbon nanosheets on one surface of a commercial polypropylene separator. This structure for a thin functional separator heightens the reversible capacity and cycle performance by doping nitrogen to chemically bond with polysulfides and the porous carbon layer to physically block polysulfides. As a result, the Li–S batteries based on the functional separators deliver an initial capacity of 1169.0 mA h g−1 at current rate of 1C and a substantial capacity of 845.3 mA h g−1 after 500 cycles, corresponding to a low capacity decay of only 0.055% per cycle. Even at a high rate of 3C, the batteries can still deliver a high reversible capacity of 743.6 mA h g−1 with good cycle performance.

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