Soybean-derived hierarchical porous carbon with large sulfur loading and sulfur content for high-performance lithium-sulfur batteries

Guofeng Ren, Shiqi Li, Zhao Xia Fan, Juliusz Warzywoda, Zhaoyang Fan

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

An hierarchical porous carbon nanostructure with intrinsic O- and N-dopants and an ultrahigh specific surface area of 1500 m2 g-1 is reported towards the goal of designing and achieving a better sulfur electrode for lithium-sulfur batteries (LSBs) that can provide both large sulfur loading and large sulfur content and are based on a facile fabrication process. This nanostructure was derived from crude soybeans in a facile pyrolysis process. Using it as a sulfur host, the S/C active composite with 80% sulfur content was made. Cells with different sulfur loadings were investigated and were found to demonstrate large capacity, high coulombic and energy efficiencies, and high cycling stability. In particular, for a sulfur loading of 5.5 mg cm-2 and a sulfur content of 80%, cells displayed a specific capacity of ca. 950 mA h g-1, which corresponds to an areal capacity of 5.2 mA h cm-2. Such a performance moves LSB technology closer to practical applications.

Original languageEnglish
Pages (from-to)16507-16515
Number of pages9
JournalJournal of Materials Chemistry A
Volume4
Issue number42
DOIs
StatePublished - 2016

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