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Carbon coated porous silicon flakes with high initial coulombic efficiency and long-term cycling stability for lithium ion batteries

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Abstract

Silicon (Si) has been regarded as a promising next-generation anode material to replace carbon-based materials for lithium ion batteries (LIBs). However, the low initial coulombic efficiency and poor cycling stability limit its widespread application. With this in mind, carbon coated porous Si nanosheets (pSi@C) were prepared through the pyrolysis of C2H2 on porous Si nanosheets from air-oxidation demagnesiation of Mg2Si. Carbon coating improved the electrical conductivity of the composite, which is beneficial to the diffusion of Li+ and to maintain the structural integrity. The obtained pSi@C electrode shows a high initial coulombic efficiency of 80.3% and a reversible capacity of 2510 mA h g−1 at 0.4 A g−1. Furthermore, even at a current density of 2 A g−1, it can still show a reversible specific capacity of 1215 mA h g−1 after 200 cycles.

Graphical abstract: Carbon coated porous silicon flakes with high initial coulombic efficiency and long-term cycling stability for lithium ion batteries

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Publication details

The article was received on 04 May 2019, accepted on 17 Jun 2019 and first published on 18 Jun 2019


Article type: Paper
DOI: 10.1039/C9SE00281B
Sustainable Energy Fuels, 2019, Advance Article

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    Carbon coated porous silicon flakes with high initial coulombic efficiency and long-term cycling stability for lithium ion batteries

    X. Dou, M. Chen, J. Zai, Z. De, B. Dong, X. Liu, N. Ali, T. Tadesse Tsega, R. Qi and X. Qian, Sustainable Energy Fuels, 2019, Advance Article , DOI: 10.1039/C9SE00281B

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