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Appl. Sci. 2017, 7(10), 1036; doi:10.3390/app7101036

Macroporous Activated Carbon Derived from Rapeseed Shell for Lithium–Sulfur Batteries

School of Chemistry and Chemical Engineering, Institute for Innovative Materials and Energy, Yangzhou University, Yangzhou 225009, Jiangsu, China
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Received: 12 September 2017 / Accepted: 28 September 2017 / Published: 10 October 2017
(This article belongs to the Special Issue Electrode Materials for Lithium-ion Batteries/Super-capacitors)
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Abstract

Lithium–sulfur batteries have drawn considerable attention because of their extremely high energy density. Activated carbon (AC) is an ideal matrix for sulfur because of its high specific surface area, large pore volume, small-size nanopores, and simple preparation. In this work, through KOH activation, AC materials with different porous structure parameters were prepared using waste rapeseed shells as precursors. Effects of KOH amount, activated temperature, and activated time on pore structure parameters of ACs were studied. AC sample with optimal pore structure parameters was investigated as sulfur host materials. Applied in lithium–sulfur batteries, the AC/S composite (60 wt % sulfur) exhibited a high specific capacity of 1065 mAh g−1 at 200 mA g−1 and a good capacity retention of 49% after 1000 cycles at 1600 mA g−1. The key factor for good cycling stability involves the restraining effect of small-sized nanopores of the AC framework on the diffusion of polysulfides to bulk electrolyte and the loss of the active material sulfur. Results demonstrated that AC materials derived from rapeseed shells are promising materials for sulfur loading. View Full-Text
Keywords: biomass; activated carbon; sulfur hosts; lithium–sulfur battery biomass; activated carbon; sulfur hosts; lithium–sulfur battery
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zheng, M.; Hu, Q.; Zhang, S.; Tang, H.; Li, L.; Pang, H. Macroporous Activated Carbon Derived from Rapeseed Shell for Lithium–Sulfur Batteries. Appl. Sci. 2017, 7, 1036.

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