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Hierarchically assembled mesoporous carbon nanosheets with ultra large pore volume for high-performance lithium–sulfur batteries

Abstract

Porous carbon materials are considered as promising sulfur host for lithium–sulfur (Li–S) batteries. However, many porous carbon materials are prepared by complicated preparation process, facing challenges including low yield, toxic chemicals, and high-energy consumption. In this work, a simple method is reported to prepare mesoporous carbon with high surface area (2166 m2 g−1) and ultra large pore volume (4.09 cm3 g−1) by the direct carbonization of adipic acid and zinc powder mixture without further chemical/physical activation process. The mesoporous carbon is composed of nanosheets with abundant capsule-like nanopores around 15 nm, exhibiting a hierarchically assembled flower-like structure. The porous carbon nanosheets (PCNSs) with hierarchical structure are used as host for sulfur to form a homogeneous composite (S/PCNSs) though a conventional heat infiltration process. Excellent electrochemical performance is achieved for S/PCNSs as cathode of Li–S battery. The S/PCNSs composite with 62 wt % sulfur exhibits an initial discharge capacity of 1384 mA h g−1 and retains a reversible capacity of 657 mA h g−1 after 100 cycles at 0.2C rate. Remarkably, the S/PCNSs composite exhibits a decay rate of only 0.046% per cycle within 500 cycles at 1C rate. The high surface area, large pore volume, and sheet-like two-dimensional (2D) structure of the micro/mesoporous carbon matrix enable sulfur-based cathode superior electrochemical kinetics, rate capability, and long-life performance.

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Publication details

The article was received on 01 Nov 2018, accepted on 04 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8NJ05548C
Citation: New J. Chem., 2018, Accepted Manuscript
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    Hierarchically assembled mesoporous carbon nanosheets with ultra large pore volume for high-performance lithium–sulfur batteries

    J. Zhang, J. Guo, Y. Xia, Y. Gan, H. Huang, L. Chu, G. Du, X. Tao and W. Zhang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ05548C

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