期刊
NANO LETTERS
卷 14, 期 8, 页码 4418-4425出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl501383g
关键词
Bimodal porous carbon; hierarchical porous carbon; lithium-sulfur battery; small sulfur; spray pyrolysis
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [NRF-2010-C1AAA001-0029031, NRF-2012-R1A2A1A01011970, NRF-2014R1A4A1003712]
- Qatar National Research Fund (NPRP) [5-569-2-232]
Utilizing the unparalleled theoretical capacity of sulfur reaching 1675 mAh/g, lithium-sulfur (Li-S) batteries have been counted as promising enablers of future lithium ion battery (LIB) applications requiring high energy densities. Nevertheless, most sulfur electrodes suffer from insufficient cycle lives originating from dissolution of lithium polysulfides. As a fundamental solution to this chronic shortcoming, herein, we introduce a hierarchical porous carbon structure in which meso- and macropores are surrounded by outer micropores. Sulfur was infiltrated mainly into the inner meso- and macropores, while the outer micropores remained empty, thus serving as a barricade against outward dissolution of long-chain lithium polysulfides. On the basis of this systematic design, the sulfur electrode delivered 1412 mAh/g(sulfur) with excellent capacity retention of 77% after 500 cycles. Also, a control study suggests that even when sulfur is loaded into the outer micropores, the robust cycling performance is preserved by engaging small sulfur crystal structures (S2-4). Furthermore, the hierarchical porous carbon was produced in ultrahigh speed by scalable spray pyrolysis. Each porous carbon particle was synthesized through 5 s of carrier gas flow in a reaction tube.
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