From Ab initio calculations to multiscale design of Si/C core-shell particles for Li-ion anodes

Maria E. Stournara, Yue Qi, Vivek B. Shenoy

    Research output: Contribution to journalArticle

    • 14 Citations

    Abstract

    The design of novel Si-enhanced nanocomposite electrodes that will successfully mitigate mechanical and chemical degradation is becoming increasingly important for next generation Li-ion batteries. Recently Si/C hollow core-shell nanoparticles were proposed as a promising anode architecture, which can successfully sustain thousands of cycles with high Coulombic efficiency. As the structural integrity and functionality of these heterogeneous Si materials depend on the strength and fracture energy of the active materials, an in-depth understanding of the interface and their intrinsic mechanical properties, such as fracture strength and debonding, becomes critical for the successful design of such and similar composites. Here, we first perform ab initio simulations to calculate these properties for lithiated a-Si/a-C interface structures and combine these results with linear elasticity expressions to model conditions that will avert fracture and debonding in these heterostructures. We find that the a-Si/a-C interface retains good adhesion even at high stages of lithiation. For average lithiated structures, we predict that the strong Si-C bonding averts fracture at the interface; instead, the structure ruptures within lithiated a-Si. From the calculated values and linear elastic fracture mechanics, we then construct a continuum level diagram, which outlines the safe regimes of operation in terms of the core and shell thickness and the state of charge. We believe that this multiscale approach can serve as a foundation for developing quantitative failure models and for subsequent development of flaw-tolerant anode architectures.

    Original languageEnglish (US)
    Pages (from-to)2140-2149
    Number of pages10
    JournalNano Letters
    Volume14
    Issue number4
    DOIs
    StatePublished - Apr 9 2014

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    Keywords

    • ab initio calculations
    • continuum modeling
    • fracture
    • Li-ion battery
    • Si/C composite anode
    • Si/C interface strength

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Mechanical Engineering

    Cite this

    From Ab initio calculations to multiscale design of Si/C core-shell particles for Li-ion anodes. / Stournara, Maria E.; Qi, Yue; Shenoy, Vivek B.

    In: Nano Letters, Vol. 14, No. 4, 09.04.2014, p. 2140-2149.

    Research output: Contribution to journalArticle

    Stournara, Maria E.; Qi, Yue; Shenoy, Vivek B. / From Ab initio calculations to multiscale design of Si/C core-shell particles for Li-ion anodes.

    In: Nano Letters, Vol. 14, No. 4, 09.04.2014, p. 2140-2149.

    Research output: Contribution to journalArticle

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