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Phys Chem Chem Phys. 2013 Nov 14;15(42):18549-54. doi: 10.1039/c3cp52777h.

Core-shell Si-N-doped C assembled via an oxidative template for lithium-ion anodes.

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1
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, P. R. China. Sjiao@ustb.edu.cn hzhu@metall.ustb.edu.cn.

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.

PMID:
24076966
DOI:
10.1039/c3cp52777h
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