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HF-free Synthesis of Si/C Yolk/Shell Anodes for Lithium-ion Batteries

Abstract

Silicon anodes for lithium-ion batteries have attracted extensive investigation due to their very high theoretical capacity; however, with huge volume change upon lithiation, their cyclic performance has yet to be improved for commercial applications. While yolk/shell Si/C has been proven to possess enhanced cyclic performance due to rich voids, its preparation requires HF to remove templates, which is not environmentally friendly and needs precaution. Here, a yolk/shell Si/C anode was designed using an HF-free approach to accommodate the volume expansion of Si while achieving high energy storage. Si nanoparticles were chemically coated with polystyrene (PS) and polyaniline (PAni) in sequence, followed by carbonization of the two polymers, in which PS (a soft carbon precursor) was used to generate pores and coat a thin layer of C on the Si while PAni (a hard carbon source) resulted in outer C shells, forming core-shell structured Si@C@void@C. The void spaces in the Si@C@void@C allowed the Si to expand freely upon lithiation while the C shell offered a robust shield, preventing the Si from depleting the electrolyte by repeated formation of a solid-electrolyte interphase layer upon cycling. In addition, nitrogen-doped C, derived from N-containing polymer (polyaniline) can improve electrical conductivity. Thus, such an Si@C@void@C anode exhibited excellent cyclic performance (no capacity decay for 500 cycles) at 1,000 mA g-1.

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Publication details

The article was received on 20 Sep 2017, accepted on 03 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA08283E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    HF-free Synthesis of Si/C Yolk/Shell Anodes for Lithium-ion Batteries

    X. Huang, X. Sui, H. Yang, R. REN, Y. wu, X. Guo and J. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA08283E

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