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Heat-treatment-assisted approach towards scalable synthesis of mesoporous carbons for high-performance lithium-sulfur battery

[Display omitted] •Mesoporous carbon is prepared via scalable solvent-free nanocasting approach.•Heat-treatment-assisted mechanism was reported for mesoporous carbon synthesis.•The resulting mesoporous carbon presents a large mesopore size of ca. 12.4 nm.•Highly interconnected mesopore structure aff...

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Published in:Materials letters 2019-07, Vol.246, p.165-168
Main Authors: Sun, Qiang, Li, Yi-Ding, Liu, Long, Feng, Zhong-Bao, Lu, Pai, Wang, Zeng-Rong, Zhang, Xue
Format: Article
Language:English
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Summary:[Display omitted] •Mesoporous carbon is prepared via scalable solvent-free nanocasting approach.•Heat-treatment-assisted mechanism was reported for mesoporous carbon synthesis.•The resulting mesoporous carbon presents a large mesopore size of ca. 12.4 nm.•Highly interconnected mesopore structure affords efficient immobilizing of sulfur.•The sulfur-carbon shows high capacity of 860 mA h g−1 at 0.5 C after 200 cycles. A heat-treatment-assisted approach towards scalable synthesis of mesoporous carbons by direct solid-solid mixing of microcrystalline cellulose (MCC) and nano-sized SiO2, subsequent pyrolysis and SiO2 removal process, was reported in this study. The obtained mesoporous carbon presented a well-defined mesopore structure with high surface area and large mesopore size. During synthesis, MCC underwent structural relaxation process before degradation, which could provide a capillarity condensation force inducing the imprint of mesopore on final carbons. Due to the proper structure, the as-prepared mesoporous carbon showed prominent performance as sulfur host for lithium-sulfur (Li-S) battery, exhibiting a high reversible capacity of 860 mA h g−1 at 0.5 C after 200 cycles, and exceptional rate capability with 600 mA h g−1 at 5.0 C.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.03.043