Biomass‐Derived Porous Carbon with Micropores and Small Mesopores for High‐Performance Lithium–Sulfur Batteries |
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Authors: | Kai Yang Prof. Qiuming Gao Yanli Tan Weiqian Tian Weiwei Qian Lihua Zhu Chunxiao Yang |
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Affiliation: | Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing, P. R. China |
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Abstract: | Biomass‐derived porous carbon BPC‐700, incorporating micropores and small mesopores, was prepared through pyrolysis of banana peel followed by activation with KOH. A high specific BET surface area (2741 m2 g?1), large specific pore volume (1.23 cm3 g?1), and well‐controlled pore size distribution (0.6–5.0 nm) were obtained and up to 65 wt % sulfur content could be loaded into the pores of the BPC‐700 sample. When the resultant C/S composite, BPC‐700‐S65, was used as the cathode of a Li–S battery, a large initial discharge capacity (ca. 1200 mAh g?1) was obtained, indicating a good sulfur utilization rate. An excellent discharge capacity (590 mAh g?1) was also achieved for BPC‐700‐S65 at the high current rate of 4 C (12.72 mA cm?2), showing its extremely high rate capability. A reversible capacity of about 570 mAh g?1 was achieved for BPC‐700‐S65 after 500 cycles at 1 C (3.18 mA cm?2), indicating an outstanding cycling stability. |
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Keywords: | batteries biomass carbon lithium sulfur |
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