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Issue 2, 2019
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Self-assembled and well separated B and N co-doped hierarchical carbon structures as high-capacity, ultra-stable, LIB anode materials

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Abstract

Herein, we present a simple synthesis strategy addressing two challenges of advantageous carbon anode design: (1) achieving self-assembled, i.e. “templateless”, porous hierarchical structures, with (2) well separated B and N co-doping. Heating tert-butylamine borane with two different forms of cobalt catalysts gives rise to either B and N co-doped carbon nanofiber networks (BN-CNN) or B and N co-doped graphene sheet networks (BN-GSN). Both materials form porous, hierarchical networks with advantageous, well separated, B and N co-doping (i.e. with high B–C, N–C or B–C–N content, and very low B–N content). The networks have large surface areas with abundant Li-ion storage sites, high electrical and ion conductivity, and good structural stability. Accordingly, B and N co-doped carbon nanofiber networks deliver an impressively high reversible capacity of 1017 mA h g−1 at 0.05 A g−1 and have ultrahigh long term cycling stability at the high current densities of 0.5 and 2 A g−1, where after 1000 and 2500 cycles, respectively, they deliver 629 and 480 mA h g−1. In addition, B and N co-doped carbon nanofiber networks have a lower average voltage (<1.0 V vs. Li/Li+) and higher first-cycle coulombic efficiency (∼70%) than most reported porous carbons.

Graphical abstract: Self-assembled and well separated B and N co-doped hierarchical carbon structures as high-capacity, ultra-stable, LIB anode materials

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Publication details

The article was received on 05 Nov 2018, accepted on 11 Dec 2018 and first published on 12 Dec 2018


Article type: Paper
DOI: 10.1039/C8SE00542G
Citation: Sustainable Energy Fuels, 2019,3, 478-487

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    Self-assembled and well separated B and N co-doped hierarchical carbon structures as high-capacity, ultra-stable, LIB anode materials

    J. Zhu, P. Wei, J. Key, S. Yin, S. Ma and P. K. Shen, Sustainable Energy Fuels, 2019, 3, 478
    DOI: 10.1039/C8SE00542G

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