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Issue 42, 2013
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Core–shell Si–N-doped C assembled via an oxidative template for lithium-ion anodes

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Abstract

The Si–NC core–shell composite was synthesized by a modified oxidative template assembly route using a facile carbonization process. The images of the obtained Si–NC composites showed that an amorphous NC layer adsorbed stably and tightly on the nano-Si surface with an only several nanometers thickness to the formation of the Si–NC core–shell structure, which was beneficial for the electronic contact of Si nanoparticles. For the Si–NC-700 anode, it could be calculated that the initial charge capacity was 986.2 mA h g−1 at a rate of 0.2 C. And it could still be kept at 764.4 mA h g−1 over 100 cycles, with a little capacity loss of 0.22% per cycle. Moreover, it was concluded that the Si–NC-700 anode could achieve a capacity of 790.8 mA h g−1 for the first cycle, and significantly remain at 778.2 mA h g−1 over 500 cycles at a rate of 0.5 C. These excellent electrochemical performances could probably be due to the N-doping generating the extrinsic defects and the absorption of Li ions, and hence result in a superior long-term cycling stability and rate capability. This suggests that the core–shell Si–NC composite is a promising material for improving the electrochemical performance of lithium-ion anodes.

Graphical abstract: Core–shell Si–N-doped C assembled via an oxidative template for lithium-ion anodes

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Publication details

The article was received on 03 Jul 2013, accepted on 07 Sep 2013 and first published on 09 Sep 2013


Article type: Paper
DOI: 10.1039/C3CP52777H
Citation: Phys. Chem. Chem. Phys., 2013,15, 18549-18554
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    Core–shell Si–N-doped C assembled via an oxidative template for lithium-ion anodes

    J. Tu, L. Hu, S. Jiao, J. Hou and H. Zhu, Phys. Chem. Chem. Phys., 2013, 15, 18549
    DOI: 10.1039/C3CP52777H

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