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Biomass‐Derived Porous Carbon with Micropores and Small Mesopores for High‐Performance Lithium–Sulfur Batteries
Author(s) -
Yang Kai,
Gao Qiuming,
Tan Yanli,
Tian Weiqian,
Qian Weiwei,
Zhu Lihua,
Yang Chunxiao
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201504672
Subject(s) - sulfur , mesoporous material , pyrolysis , carbon fibers , specific surface area , chemical engineering , lithium–sulfur battery , materials science , porosity , lithium (medication) , bet theory , composite number , cathode , biomass (ecology) , volume (thermodynamics) , chemistry , electrochemistry , catalysis , electrode , organic chemistry , composite material , metallurgy , medicine , oceanography , physics , quantum mechanics , geology , engineering , endocrinology
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 m 2 g −1 ), large specific pore volume (1.23 cm 3 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.