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Uniform yolk–shell structured Si–C nanoparticles as a high performance anode material for the Li-ion battery

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Abstract

Silicon (Si) is a promising candidate as an anode material for lithium-ion batteries. However, its application is hindered by poor cycling stability and rate-capability due to structural degradation, resulting from large volume changes during cyclic charging and discharging. In this paper, we report that uniform-sized Si@void@C nanoparticles can be prepared by magnesiothermic reduction of SiO2@void@C. Si nanoparticles are in hollow carbon shells with a large void space between the carbon shell and particles. Thus, each Si particle can expand freely within the well-designed void space without destroying the outer carbon shell, and benefit the solid–electrolyte interphase film stabilization on the carbon shell. The new material shows a high capacity of 1598 mA h g−1 at a current density of 1 A g−1, a long cycle life of 1500 cycles with 85% capacity retention, and a high Coulombic efficiency of 99.6% as well, and might be a promising Si-based anode material for Li-ion battery applications.

Graphical abstract: Uniform yolk–shell structured Si–C nanoparticles as a high performance anode material for the Li-ion battery

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Publication details

The article was received on 12 Oct 2019, accepted on 25 Nov 2019 and first published on 28 Nov 2019


Article type: Communication
DOI: 10.1039/C9CC07997A
Chem. Commun., 2020, Advance Article

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    Uniform yolk–shell structured Si–C nanoparticles as a high performance anode material for the Li-ion battery

    X. Li, Y. Xing, J. Xu, Q. Deng and L. Shao, Chem. Commun., 2020, Advance Article , DOI: 10.1039/C9CC07997A

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