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A carob-inspired nanoscale design of yolk-shell Si@void@TiO2-CNFs composite as anode material for high performance lithium-ion batteries

Abstract

Silicon (Si) is an attractive anode material for lithium-ion batteries due to its high gravimetric and volumetric capacity. However, the challenges for Si anodes are low conductivity, unstable solid electrolyte interphase (SEI) layer and big volume expansion during charge/discharge process. Inspired by the structure of a carob, we propose a yolk-shell structured Si anode which tackles all these problems mentioned above. The non-filling Si clusters protected by atomic layer deposited TiO2 are embedded in highly-conductive one dimensional carbon nanofibers, which leads enough space for the expansion and contraction of Si during lithiation/delithiation. Moreover, the SEI layer will form at the outer surface of carbon nanofibers instead of on individual Si nanoparticles and can remain stable and spatially confined. Therefore, the yolk-shell composite electrode exhibits good electrochemical performance that reversible capacities of 1156 mAh g−1 at a current density of 600 mA g−1 after 500 cycles and 485 mAh g−1 at the current density of 9600 mA g−1 after 2000 cycles are obtained.

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Publication details

The article was received on 15 Mar 2019, accepted on 11 Apr 2019 and first published on 11 Apr 2019


Article type: Paper
DOI: 10.1039/C9DT01130G
Citation: Dalton Trans., 2019, Accepted Manuscript

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    A carob-inspired nanoscale design of yolk-shell Si@void@TiO2-CNFs composite as anode material for high performance lithium-ion batteries

    C. Zhang, J. Yang, H. Mi, Y. Li, P. Zhang and H. Zhang, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT01130G

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