Fabrication of boron-doped porous carbon with termite nest shape via natural macromolecule and borax to obtain lithium-sulfur/sodium-ion batteries with improved rate performance

Hai Feng Wang, Chao Ying Fan, Xiao Ying Li, Xing Long Wu, Huan Huan Li, Hai Zhu Sun, Hai Ming Xie, Jing Ping Zhang, Cui Yan Tong

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Lithium sulfur (Li-S) batteries possess high theoretical specific capacity (1675 mAh g−1) and energy density (2567 Wh kg−1), but are plagued by their poor rate performance. The discovery of new carbon sources, design of novel porous carbon structures, and effective hetero-atom doping of the sulfur matrix are key to overcome this dilemma. In this paper, a boron-doped porous carbon material with a termite nest shape (TNPBC) was obtained from a new carbon source, polyaspartic acid, and borax. Importantly, the doping, activation, and pyrolysis were integrated into one step through a low cost and simple methodology. The borax was essential to formation of a high surface porous architecture and provided boron dopants, which, combined with polyaspartic acid, achieves co-doping (B and N) carbon materials with special porous structures. The simultaneous pore-formation and doping leave an abundance of hetero-atoms exposed on the surface of pores, which enhances the electrostatic interactions between the hetero-atoms and the charged species in the batteries. As a result, the S/TNPBC cathode maintains a stable capacity of 703 mAh g−1 with an excellent Coulombic efficiency of 101.3% after 120 cycles at 0.1C. Moreover, it exhibits an excellent rate capability with an initial capacity of 650 mAh g−1 at 0.5C and sustains a capacity of 500 mAh g−1 after 100 cycles. Furthermore, when TNPBC is used as the anode in a sodium ion battery, an excellent rate capability is achieved. The specific charge capacity is three times greater than without boron doping at 500 mA g−1. Due to the simple fabrication process and desirable properties of this novel architecture, TNPBC provides a new strategy for enhancing the performance of commercial energy storage devices.

Original languageEnglish (US)
Pages (from-to)86-95
Number of pages10
JournalElectrochimica Acta
Volume244
DOIs
StatePublished - Aug 1 2017

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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